All Listed Species
2359 Records
Parameters:
- Listing Statuses: Endangered, Threatened, Emergency Listing, Endangered, Emergency Listing, Threatened, Similarity of Appearance (Endangered), Similarity of Appearance (Threatened)
When searching by State,
please note that a species will show up in the report only if it has a spatial current range.
State associations for a species are based on a spatial current range delineated by
FWS biologists in TESS (and not all species have spatial current range delineated at
the present time).
The current range of species entities consisting of one or more populations does not include states or countries outside those population boundaries, even though the species may occur there in a population not covered by the Endangered Species Act.
The current range of species entities consisting of one or more populations does not include states or countries outside those population boundaries, even though the species may occur there in a population not covered by the Endangered Species Act.
| Scientific Name | Common Name | Species Code | Population Code | Lead Region | Federal Listing Status | Where Listed |
|---|---|---|---|---|---|---|
| Abies guatemalensis | Guatemalan Fir (=pinabete) | R003 | P01 | Foreign | Threatened | Wherever found |
| Abronia macrocarpa | Large-fruited sand-verbena | Q24E | P01 | 2 | Endangered | Wherever found |
| Abutilon eremitopetalum | No common name | Q1SJ | P01 | 1 | Endangered | Wherever found |
| Abutilon menziesii | Ko`oloa`ula | Q1SK | P01 | 1 | Endangered | Wherever found |
| Abutilon sandwicense | No common name | Q1SL | P01 | 1 | Endangered | Wherever found |
| Acaena exigua | Liliwai | Q1SM | P01 | 1 | Endangered | Wherever found |
| Acanthomintha ilicifolia | San Diego thornmint | Q00E | P01 | 8 | Threatened | Wherever found |
| Acanthomintha obovata ssp. duttonii | San Mateo thornmint | Q24H | P01 | 8 | Endangered | Wherever found |
| Acanthorutilus handlirschi | Cicek (minnow) | E00N | V01 | Foreign | Endangered | Wherever found |
| Accipiter fasciatus natalis | Christmas Island goshawk | B01N | V01 | Foreign | Endangered | Wherever found |
| Accipiter francesii pusillus | Anjouan Island sparrowhawk | B03A | V01 | Foreign | Endangered | Wherever found |
| Accipiter gentilis laingi | Queen Charlotte goshawk | B0AE | V02 | Foreign | Threatened | British Columbia, Canada |
| Accipiter striatus venator | Puerto Rican sharp-shinned hawk | B06Z | V01 | 4 | Endangered | Wherever found |
| Achatinella spp. | Oahu tree snails | G01J | I01 | 1 | Endangered | Wherever found |
| Achyranthes mutica | No common name | Q00G | P01 | 1 | Endangered | Wherever found |
| Achyranthes splendens var. rotundata | Round-leaved chaff-flower | Q24I | P01 | 1 | Endangered | Wherever found |
| Acinonyx jubatus | Cheetah | A00S | V01 | Foreign | Endangered | Wherever found |
| Acipenser brevirostrum | Shortnose sturgeon | E00B | V01 | NMFS | Endangered | Wherever found |
| Acipenser dabryanus | Yangtze Sturgeon | E0BV | V01 | Foreign | Endangered | Wherever found |
| Acipenser medirostris | green sturgeon | E09K | V01 | NMFS | Threatened | Southern DPS - See 50 CFR 223.102 |
| Acipenser mikadoi | Sakhalin sturgeon | E0D5 | V01 | NMFS | Endangered | Wherever found |
| Acipenser naccarii | Adriatic sturgeon | E0CH | V01 | NMFS | Endangered | Wherever found |
| Acipenser oxyrinchus (=oxyrhynchus) desotoi | Gulf sturgeon | E04W | V01 | 4 | Threatened | Wherever found |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | E0A7 | V02 | NMFS | Threatened | Gulf of Maine DPS - See 50 CFR 223.102 |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | E0A7 | V03 | NMFS | Endangered | New York Bight DPS - See 50 CFR 224.101 |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | E0A7 | V04 | NMFS | Endangered | Chesapeake Bay DPS - See 50 CFR 224.101 |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | E0A7 | V05 | NMFS | Endangered | Carolina DPS - See 50 CFR 224.101 |
| Acipenser oxyrinchus oxyrinchus | Atlantic sturgeon | E0A7 | V06 | NMFS | Endangered | South Atlantic DPS - See 50 CFR 224.101 |
| Acipenser sinensis | Chinese sturgeon | E0CI | V01 | NMFS | Endangered | Wherever found |
| Acipenser sturio | European sturgeon | E0CJ | V01 | NMFS | Endangered | Wherever found |
| Acipenser transmontanus | White sturgeon | E087 | V01 | 1 | Endangered | U.S.A. (ID, MT), Canada (B.C.), (Kootenai R. system) |
| Aconitum noveboracense | Northern wild monkshood | Q1SN | P01 | 3 | Threatened | Wherever found |
| Acrocephalus familiaris kingi | Nihoa millerbird (old world warbler) | B00G | V01 | 1 | Endangered | Wherever found |
| Acrocephalus luscinia | Nightingale reed warbler (old world warbler) | B043 | V01 | 1 | Endangered | Wherever found |
| Acrocephalus percernis aquilonis | Eiao Marquesas reed-Warbler | B0D7 | V01 | Foreign | Endangered | Wherever found |
| Acropora cervicornis | Staghorn coral | P000 | I01 | NMFS | Threatened | Wherever found |
| Acropora globiceps | No common name | P00O | I01 | NMFS | Threatened | Wherever found |
| Acropora jacquelinae | No common name | P00B | I01 | NMFS | Threatened | Wherever found |
| Acropora lokani | No common name | P00C | I01 | NMFS | Threatened | Wherever found |
| Acropora palmata | Elkhorn coral | P001 | I01 | NMFS | Threatened | Wherever found |
| Acropora pharaonis | No common name | P00U | I01 | NMFS | Threatened | Wherever found |
| Acropora retusa | No common name | P00W | I01 | NMFS | Threatened | Wherever found |
| Acropora rudis | No common name | P00D | I01 | NMFS | Threatened | Wherever found |
| Acropora speciosa | No common name | P00X | I01 | NMFS | Threatened | Wherever found |
| Acropora tenella | No common name | P00Z | I01 | NMFS | Threatened | Wherever found |
| Addax nasomaculatus | Addax | A0G3 | V01 | Foreign | Endangered | Wherever found |
| Adelocosa anops | Kauai cave wolf or pe'e pe'e maka 'ole spider | J000 | I01 | 1 | Endangered | Wherever found |
| Adenophorus periens | Palai la`au | S00M | P01 | 1 | Endangered | Wherever found |
| Aepyceros melampus petersi | Black-faced impala | A01E | V01 | Foreign | Endangered | Wherever found |
| Aerodramus bartschi | Mariana swiftlet | B091 | V01 | 1 | Endangered | Wherever found |
| Aeschynomene virginica | Sensitive joint-vetch | Q24J | P01 | 5 | Threatened | Wherever found |
| Agalinis acuta | Sandplain gerardia | Q24K | P01 | 5 | Endangered | Wherever found |
| Agave eggersiana | No common name | Q00O | P01 | 4 | Endangered | Wherever found |
| Agelaius xanthomus | Yellow-shouldered blackbird | B05T | V01 | 4 | Endangered | Wherever found |
| Agelastes meleagrides | White-breasted guineafowl | B09S | V01 | Foreign | Threatened | Wherever found |
| Ailuropoda melanoleuca | Giant panda | A0A5 | V01 | Foreign | Endangered | Wherever found |
| Aipysurus fuscus | Dusky sea snake | C081 | V01 | NMFS | Endangered | Entire |
| Alasmidonta atropurpurea | Cumberland elktoe | F01K | I01 | 4 | Endangered | Wherever found |
| Alasmidonta heterodon | Dwarf wedgemussel | F029 | I01 | 5 | Endangered | Wherever found |
| Alasmidonta raveneliana | Appalachian elktoe | F01J | I01 | 4 | Endangered | Wherever found |
| Alauda razae | Raso lark | B09T | V01 | Foreign | Endangered | Wherever found |
| Alcelaphus buselaphus swaynei | Swayne's hartebeest | A018 | V01 | Foreign | Endangered | Wherever found |
| Alcelaphus buselaphus tora | Tora hartebeest | A07P | V01 | Foreign | Endangered | Wherever found |
| Alectryon macrococcus | Mahoe | Q1SO | P01 | 1 | Endangered | Wherever found |
| Alethe choloensis | Thyolo alethe | B09K | V01 | Foreign | Endangered | Wherever found |
| Alligator mississippiensis | American alligator | C000 | V01 | 4 | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Alligator sinensis | Chinese alligator | C00W | V01 | Foreign | Endangered | Wherever found |
| Allium munzii | Munz's onion | Q2X0 | P01 | 8 | Endangered | Wherever found |
| Alopecurus aequalis var. sonomensis | Sonoma alopecurus | Q01F | P01 | 8 | Endangered | Wherever found |
| Alouatta palliata | Mantled howler monkey | A05T | V01 | Foreign | Endangered | Wherever found |
| Alouatta pigra | Black howler monkey | A06S | V01 | Foreign | Threatened | Wherever found |
| Amaranthus brownii | No common name | Q01G | P01 | 1 | Endangered | Wherever found |
| Amaranthus pumilus | Seabeach amaranth | Q2MZ | P01 | 4 | Threatened | Wherever found |
| Amazilia luciae | Honduran emerald hummingbird | B0GG | V01 | Foreign | Endangered | Wherever found |
| Amazona arausiaca | Red-necked parrot | B05V | V01 | Foreign | Endangered | Wherever found |
| Amazona brasiliensis | Red-tailed parrot | B06H | V01 | Foreign | Endangered | Wherever found |
| Amazona collaria | Yellow-billed parrot | B0GR | V01 | Foreign | Threatened | Wherever found |
| Amazona guildingii | St Vincent parrot | B02K | V01 | Foreign | Endangered | Wherever found |
| Amazona imperialis | Imperial parrot | B02G | V01 | Foreign | Endangered | Wherever found |
| Amazona leucocephala | Bahaman or Cuban parrot | B05C | V01 | Foreign | Endangered | Wherever found |
| Amazona pretrei pretrei | Red-spectacled parrot | B05E | V01 | Foreign | Endangered | Wherever found |
| Amazona rhodocorytha | Red-browed parrot | B02I | V01 | Foreign | Endangered | Wherever found |
| Amazona versicolor | St. Lucia parrot | B02J | V01 | Foreign | Endangered | Wherever found |
| Amazona vinacea | Vinaceous-breasted parrot | B05F | V01 | Foreign | Endangered | Wherever found |
| Amazona vittata | Puerto Rican parrot | B00L | V01 | 4 | Endangered | Wherever found |
| Amblema neislerii | Fat threeridge (mussel) | F032 | I01 | 4 | Endangered | Wherever found |
| Amblyopsis rosae | Ozark cavefish | E02J | V01 | 4 | Threatened | Wherever found |
| Ambrosia cheiranthifolia | South Texas ambrosia | Q1SS | P01 | 2 | Endangered | Wherever found |
| Ambrosia pumila | San Diego ambrosia | Q01H | P01 | 8 | Endangered | Wherever found |
| Ambrysus amargosus | Ash Meadows naucorid | I023 | I01 | 8 | Threatened | Wherever found |
| Ambystoma bishopi | Reticulated flatwoods salamander | D042 | V01 | 4 | Endangered | Wherever found |
| Ambystoma californiense | California tiger Salamander | D01T | V01 | 8 | Endangered | U.S.A. (CA - Santa Barbara County) |
| Ambystoma californiense | California tiger Salamander | D01T | V02 | 8 | Endangered | U.S.A. (CA - Sonoma County) |
| Ambystoma californiense | California tiger Salamander | D01T | V03 | 8 | Threatened | U.S.A. (CA - Central California) |
| Ambystoma cingulatum | Frosted Flatwoods salamander | D013 | V01 | 4 | Threatened | Wherever found |
| Ambystoma macrodactylum croceum | Santa Cruz long-toed salamander | D000 | V01 | 8 | Endangered | Wherever found |
| Ambystoma mavortium stebbinsi | Sonoran tiger salamander | D01H | V01 | 2 | Endangered | Wherever found |
| Ameiva polops | St. Croix ground lizard | C01P | V01 | 4 | Endangered | Wherever found |
| Ammodorcas clarkei | Clark's gazelle | A011 | V01 | Foreign | Endangered | Wherever found |
| Ammodramus savannarum floridanus | Florida grasshopper sparrow | B07G | V01 | 4 | Endangered | Wherever found |
| Ammospiza maritima mirabilis | Cape Sable seaside sparrow | B00Q | V01 | 4 | Endangered | Wherever found |
| Amorpha crenulata | Crenulate lead-plant | Q2RI | P01 | 4 | Endangered | Entire |
| Amphianthus pusillus | Little amphianthus | Q1ST | P01 | 4 | Threatened | Wherever found |
| Amsinckia grandiflora | Large-flowered fiddleneck | Q1SU | P01 | 8 | Endangered | Wherever found |
| Amsonia kearneyana | Kearney's blue-star | Q24Z | P01 | 2 | Endangered | Wherever found |
| Amytornis goyderi | Eyrean grasswren (flycatcher) | B01P | V01 | Foreign | Endangered | Wherever found |
| Anacropora spinosa | No common name | P00E | I01 | NMFS | Threatened | Wherever found |
| Anaea troglodyta floridalis | Florida leafwing Butterfly | I087 | I01 | 4 | Endangered | Wherever found |
| Anairetes alpinus | Ash-breasted tit-tyrant | B0BF | V01 | Foreign | Endangered | Wherever found |
| Anas aucklandica nesiotis | Campbell Island flightless teal | B05O | V01 | Foreign | Endangered | Wherever found |
| Anas laysanensis | Laysan duck | B006 | V01 | 1 | Endangered | Wherever found |
| Anas wyvilliana | Hawaiian duck | B005 | V01 | 1 | Endangered | Wherever found |
| Anaxyrus baxteri | Wyoming Toad | D01R | V01 | 6 | Endangered | Wherever found |
| Anaxyrus californicus | Arroyo (=arroyo southwestern) toad | D020 | V01 | 8 | Endangered | Wherever found |
| Anaxyrus canorus | Yosemite toad | D02K | V01 | 8 | Threatened | Wherever found |
| Anaxyrus williamsi | Dixie Valley Toad | D04S | V01 | 8 | Endangered | Entire |
| Andrias davidianus (=davidianus d.) | Chinese giant salamander | D007 | V01 | Foreign | Endangered | Wherever found |
| Andrias japonicus (=davidianus j.) | Japanese giant salamander | D008 | V01 | Foreign | Endangered | Wherever found |
| Anguispira picta | Painted snake coiled forest snail | G00W | I01 | 4 | Threatened | Wherever found |
| Anodorhynchus glaucus | Glaucous macaw | B056 | V01 | Foreign | Endangered | Wherever found |
| Anodorhynchus hyacinthinus | Hyacinth macaw | B0GL | V01 | Foreign | Threatened | Wherever found |
| Anodorhynchus leari | Indigo macaw | B057 | V01 | Foreign | Endangered | Wherever found |
| Anolis roosevelti | Culebra Island giant anole | C01O | V01 | 4 | Endangered | Wherever found |
| Anoxypristis cuspidata | Narrow sawfish | E0D1 | V01 | NMFS | Endangered | Wherever found |
| Antechinomys laniger | Eastern jerboa marsupial | A034 | V01 | Foreign | Endangered | Wherever found |
| Antechinus apicalis | Dibbler | A032 | V01 | Foreign | Endangered | Wherever found |
| Antigone canadensis pulla | Mississippi sandhill crane | B04I | V01 | 4 | Endangered | Wherever found |
| Antilocapra americana peninsularis | Peninsular pronghorn | A04M | V01 | Foreign | Endangered | Mexico (Baja California) |
| Antilocapra americana sonoriensis | Sonoran pronghorn | A009 | V01 | 2 | Endangered | Wherever found, except where listed as an experimental population |
| Antrobia culveri | Tumbling Creek cavesnail | G04I | I01 | 3 | Endangered | Wherever found |
| Antrolana lira | Madison Cave isopod | K008 | I01 | 5 | Threatened | Wherever found |
| Antrostomus noctitherus | Puerto Rican nightjar | B04J | V01 | 4 | Endangered | Wherever found |
| Aonyx congicus (=congica) microdon | Cameroon clawless otter | A02W | V01 | Foreign | Endangered | Wherever found |
| Aphelocoma coerulescens | Florida scrub-jay | B082 | V01 | 4 | Threatened | Wherever found |
| Apios priceana | Price''s potato-bean | Q1SW | P01 | 4 | Threatened | Entire |
| Aplodontia rufa nigra | Point Arena mountain beaver | A0BJ | V01 | 8 | Endangered | Wherever found |
| Aplonis pelzelni | Ponape mountain starling | B00X | V01 | Foreign | Endangered | Wherever found |
| Apodemia mormo langei | Lange's metalmark butterfly | I00H | I01 | 8 | Endangered | Wherever found |
| Aproteles bulmerae | Bulmer's fruit bat (=flying fox) | A09W | V01 | Foreign | Endangered | Wherever found |
| Aptenodytes forsteri | emperor penguin | B0FB | V01 | Foreign | Threatened | Wherever found |
| Aquila heliaca adalberti | Spanish imperial eagle | B01F | V01 | Foreign | Endangered | Wherever found |
| Ara ambiguus | Great green macaw | B0GJ | V01 | Foreign | Endangered | Wherever found |
| Arabis georgiana | Georgia rockcress | Q02R | P01 | 4 | Threatened | Wherever found |
| Arabis hoffmannii | Hoffmann's rock-cress | Q02U | P01 | 8 | Endangered | Wherever found |
| Arabis macdonaldiana | McDonald's rock-cress | Q1SX | P01 | 8 | Endangered | Wherever found |
| Arabis perstellata | Braun's rock-cress | Q1SY | P01 | 4 | Endangered | Wherever found |
| Ara glaucogularis | Blue-throated macaw | B0BR | V01 | Foreign | Endangered | Wherever found |
| Ara macao ssp. cyanopterus | Scarlet macaw | B0GP | V01 | Foreign | Endangered | Wherever found |
| Ara macao ssp. macao | Scarlet macaw | B0OD | V02 | Foreign | Threatened | Northern DPS |
| Ara macao ssp. macao | Scarlet macaw | B0OD | V03 | Foreign | Similarity of Appearance to a Threatened Taxon | Southern DPS |
| Ara militaris | Military macaw | B0GM | V01 | Foreign | Endangered | Wherever found |
| Aratinga guarouba | Golden conure | B05B | V01 | Foreign | Threatened | Wherever found |
| Arcanator orostruthus | Dappled mountain robin | B0A3 | V01 | Foreign | Threatened | Wherever found |
| Arcidens wheeleri | Ouachita rock pocketbook | F00U | I01 | 2 | Endangered | Wherever found |
| Arctocephalus townsendi | Guadalupe fur seal | A0A8 | V01 | NMFS | Threatened | Wherever found |
| Arctomecon humilis | Dwarf Bear-poppy | Q1SZ | P01 | 6 | Endangered | Wherever found |
| Arctostaphylos confertiflora | Santa Rosa Island manzanita | Q037 | P01 | 8 | Endangered | Wherever found |
| Arctostaphylos franciscana | Franciscan manzanita | Q25C | P01 | 8 | Endangered | Wherever found |
| Arctostaphylos glandulosa ssp. crassifolia | Del Mar manzanita | Q036 | P01 | 8 | Endangered | Wherever found |
| Arctostaphylos hookeri var. ravenii | Presidio Manzanita | Q1T0 | P01 | 8 | Endangered | Wherever found |
| Arctostaphylos morroensis | Morro manzanita | Q259 | P01 | 8 | Threatened | Wherever found |
| Arctostaphylos myrtifolia | Ione manzanita | Q03G | P01 | 8 | Threatened | Wherever found |
| Arctostaphylos pallida | Pallid manzanita | Q03I | P01 | 8 | Threatened | Wherever found |
| Ardeotis (=Choriotis) nigriceps | Great Indian bustard | B014 | V01 | Foreign | Endangered | Wherever found |
| Arenaria paludicola | Marsh Sandwort | Q25H | P01 | 8 | Endangered | Wherever found |
| Arenaria ursina | Bear Valley sandwort | Q03Z | P01 | 8 | Threatened | Wherever found |
| Argemone pleiacantha ssp. pinnatisecta | Sacramento prickly poppy | Q1T1 | P01 | 2 | Endangered | Wherever found |
| Argyroxiphium kauense | Mauna Loa (=Ka'u) silversword | Q1T2 | P01 | 1 | Endangered | Wherever found |
| Argyroxiphium sandwicense ssp. macrocephalum | `Ahinahina | Q1T3 | P01 | 1 | Threatened | Wherever found |
| Argyroxiphium sandwicense ssp. sandwicense | `Ahinahina | Q25I | P01 | 1 | Endangered | Wherever found |
| Argythamnia blodgettii | Blodgett's silverbush | Q045 | P01 | 4 | Threatened | Entire |
| Aristida chaseae | No common name | Q2YY | P01 | 4 | Endangered | Wherever found |
| Aristida portoricensis | Pelos del diablo | Q25J | P01 | 4 | Endangered | Wherever found |
| Asclepias meadii | Mead's milkweed | Q1T6 | P01 | 3 | Threatened | Wherever found |
| Asclepias prostrata | Prostrate milkweed | Q2XI | P01 | 2 | Endangered | Entire |
| Asclepias welshii | Welsh's milkweed | Q25M | P01 | 6 | Threatened | Wherever found |
| Asimina tetramera | Four-petal pawpaw | Q1T7 | P01 | 4 | Endangered | Entire |
| Asplenium dielerectum | No common name | S00P | P01 | 1 | Endangered | Wherever found |
| Asplenium diellaciniatum | No common name | S02K | P01 | 1 | Endangered | Wherever found |
| Asplenium (=Diellia) dielfalcatum (=falcata) | No common name | S00Q | P01 | 1 | Endangered | Wherever found |
| Asplenium dielmannii | No common name | S007 | P01 | 1 | Endangered | Wherever found |
| Asplenium dielpallidum | No common name | S022 | P01 | 1 | Endangered | Wherever found |
| Asplenium peruvianum var. insulare | No common name | S00N | P01 | 1 | Endangered | Wherever found |
| Asplenium scolopendrium var. americanum | American hart's-tongue fern | S00O | P01 | 5 | Threatened | Wherever found |
| Asplenium unisorum | No common name | S01T | P01 | 1 | Endangered | Wherever found |
| Assiminea pecos | Pecos assiminea snail | G03K | I01 | 2 | Endangered | Wherever found |
| Astelia waialealae | Pa`iniu | Q3GT | P01 | 1 | Endangered | Wherever found |
| Astragalus albens | Cushenbury milk-vetch | Q2Z7 | P01 | 8 | Endangered | Wherever found |
| Astragalus ampullarioides | Shivwits milk-vetch | Q2ZA | P01 | 6 | Endangered | Wherever found |
| Astragalus applegatei | Applegate's milk-vetch | Q25T | P01 | 8 | Endangered | Wherever found |
| Astragalus bibullatus | Guthrie's (=Pyne's) ground-plum | Q2Z8 | P01 | 4 | Endangered | Wherever found |
| Astragalus brauntonii | Braunton's milk-vetch | Q05E | P01 | 8 | Endangered | Wherever found |
| Astragalus clarianus | Clara Hunt's milk-vetch | Q05J | P01 | 8 | Endangered | Wherever found |
| Astragalus cremnophylax var. cremnophylax | Sentry milk-vetch | Q1T8 | P01 | 2 | Endangered | Wherever found |
| Astragalus holmgreniorum | Holmgren milk-vetch | Q2NC | P01 | 6 | Endangered | Wherever found |
| Astragalus humillimus | Mancos milk-vetch | Q1T9 | P01 | 2 | Endangered | Wherever found |
| Astragalus jaegerianus | Lane Mountain milk-vetch | Q064 | P01 | 8 | Endangered | Wherever found |
| Astragalus lentiginosus var. coachellae | Coachella Valley milk-vetch | Q25Y | P01 | 8 | Endangered | Wherever found |
| Astragalus lentiginosus var. piscinensis | Fish Slough milk-vetch | Q25Z | P01 | 8 | Threatened | Wherever found |
| Astragalus magdalenae var. peirsonii | Peirson's milk-vetch | Q2ND | P01 | 8 | Threatened | Wherever found |
| Astragalus montii | Heliotrope milk-vetch | Q260 | P01 | 6 | Threatened | Wherever found |
| Astragalus osterhoutii | Osterhout milkvetch | Q1TA | P01 | 6 | Endangered | Wherever found |
| Astragalus phoenix | Ash meadows milk-vetch | Q1TB | P01 | 8 | Threatened | Wherever found |
| Astragalus pycnostachyus var. lanosissimus | Ventura Marsh Milk-vetch | Q076 | P01 | 8 | Endangered | Wherever found |
| Astragalus robbinsii var. jesupii | Jesup's milk-vetch | Q1TC | P01 | 5 | Endangered | Wherever found |
| Astragalus tener var. titi | Coastal dunes milk-vetch | Q07J | P01 | 8 | Endangered | Wherever found |
| Astragalus tricarinatus | Triple-ribbed milk-vetch | Q2ZO | P01 | 8 | Endangered | Wherever found |
| Astrophytum asterias | Star cactus | Q07V | P01 | 2 | Endangered | Wherever found |
| Ateles geoffroyi frontatus | Spider monkey | A01T | V01 | Foreign | Endangered | Wherever found |
| Ateles geoffroyl panamensis | Spider monkey | A01U | V01 | Foreign | Endangered | Wherever found |
| Atelopus varius zeteki | Panamanian golden frog | D006 | V01 | Foreign | Endangered | Wherever found |
| Athearnia anthonyi | Anthony's riversnail | G016 | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Atlantea tulita | Puerto Rican harlequin butterfly | I0VK | I01 | 4 | Threatened | Wherever found |
| Atrichornis clamosus | Noisy scrub-bird | B038 | V01 | Foreign | Endangered | Wherever found |
| Atriplex coronata var. notatior | San Jacinto Valley crownscale | Q2ZR | P01 | 8 | Endangered | Wherever found |
| Auerodendron pauciflorum | No common name | Q2ZU | P01 | 4 | Endangered | Wherever found |
| Avahi laniger (entire genus) | Avahi | A00O | V01 | Foreign | Endangered | Wherever found |
| Axis porcinus annamiticus | Indochina hog deer | A055 | V01 | Foreign | Endangered | Wherever found |
| Axis porcinus calamianensis | Calamianes (=Philippine) deer | A058 | V01 | Foreign | Endangered | Wherever found |
| Axis porcinus kuhli | Kuhl's (=Bawean) deer | A00T | V01 | Foreign | Endangered | Wherever found |
| Ayenia limitaris | Texas ayenia | Q2XW | P01 | 2 | Endangered | Wherever found |
| Aythya innotata | Madagascar pochard | B0A2 | V01 | Foreign | Endangered | Wherever found |
| Babyrousa babyrussa | Babirusa | A04N | V01 | Foreign | Endangered | Wherever found |
| Baccharis vanessae | Encinitas baccharis | Q264 | P01 | 8 | Threatened | Wherever found |
| Balaena mysticetus | Bowhead whale | A02N | V01 | NMFS | Endangered | Wherever found |
| Balaenoptera borealis | Sei whale | A02S | V01 | NMFS | Endangered | Wherever found |
| Balaenoptera musculus | Blue whale | A02M | V01 | NMFS | Endangered | Wherever found |
| Balaenoptera physalus | Finback whale | A02O | V01 | NMFS | Endangered | Wherever found |
| Banara vanderbiltii | Palo de ramon | Q266 | P01 | 4 | Endangered | Wherever found |
| Baptisia arachnifera | Hairy rattleweed | Q1TD | P01 | 4 | Endangered | Wherever found |
| Batagur baska | River terrapin | C00H | V01 | Foreign | Endangered | Wherever found |
| Batrachoseps aridus | Desert slender salamander | D005 | V01 | 8 | Endangered | Wherever found |
| Batrisodes texanus | Coffin Cave mold beetle | I0I9 | I01 | 2 | Endangered | Wherever found |
| Batrisodes venyivi | Helotes mold beetle | I0PT | I01 | 2 | Endangered | Wherever found |
| Bebrornis rodericanus | Rodrigues warbler (old world warbler) | B03J | V01 | Foreign | Endangered | Wherever found |
| Bebrornis sechellensis | Seychelles warbler (old world warbler) | B03L | V01 | Foreign | Endangered | Wherever found |
| Berberis nevinii | Nevin's barberry | Q08G | P01 | 8 | Endangered | Wherever found |
| Berberis pinnata ssp. insularis | Island Barberry | Q08H | P01 | 8 | Endangered | Wherever found |
| Bettongia gaimardi | Gaimard's rat-kangaroo | A04D | V01 | Foreign | Endangered | Wherever found |
| Bettongia lesueur | Lesueur's rat-kangaroo | A03J | V01 | Foreign | Endangered | Wherever found |
| Bettongia penicillata | Brush-tailed rat-kangaroo | A03I | V01 | Foreign | Endangered | Wherever found |
| Bettongia tropica | Queensland rat-kangaroo | A03L | V01 | Foreign | Endangered | Wherever found |
| Betula uber | Virginia round-leaf birch | Q1TG | P01 | 5 | Threatened | Wherever found |
| Bidens amplectens | Ko`oko`olau | Q3HE | P01 | 1 | Endangered | Wherever found |
| Bidens campylotheca ssp. pentamera | Ko`oko`olau | Q2S3 | P01 | 1 | Endangered | Wherever found |
| Bidens campylotheca ssp. waihoiensis | Ko`oko`olau | Q269 | P01 | 1 | Endangered | Wherever found |
| Bidens conjuncta | Ko`oko`olau | Q08M | P01 | 1 | Endangered | Wherever found |
| Bidens hillebrandiana ssp. hillebrandiana | kookoolau | Q3OA | P01 | 1 | Endangered | Wherever found |
| Bidens micrantha ssp. ctenophylla | Ko`oko`olau | Q2XY | P01 | 1 | Endangered | Wherever found |
| Bidens micrantha ssp. kalealaha | Ko`oko`olau | Q1TK | P01 | 1 | Endangered | Wherever found |
| Bidens wiebkei | Ko`oko`olau | Q1TN | P01 | 1 | Endangered | Wherever found |
| Bison bison athabascae | Wood Bison | A00R | V01 | 7 | Threatened | Wherever found |
| Blastocerus dichotomus | Marsh deer | A00V | V01 | Foreign | Endangered | Wherever found |
| Blennosperma bakeri | Sonoma sunshine | Q1TO | P01 | 8 | Endangered | Wherever found |
| Boechera serotina | Shale barren rock cress | Q2XA | P01 | 5 | Endangered | Wherever found |
| Boloria acrocnema | Uncompahgre fritillary butterfly | I01Q | I01 | 6 | Endangered | Wherever found |
| Boltonia decurrens | Decurrent false aster | Q26A | P01 | 3 | Threatened | Wherever found |
| Bolyeria multocarinata | Round Island bolyeria boa | C02N | V01 | Foreign | Endangered | Wherever found |
| Bombus affinis | Rusty patched bumble bee | I0WI | I01 | 3 | Endangered | Wherever found |
| Bombus franklini | Franklin's bumble bee | I0IR | I01 | 1 | Endangered | Wherever found |
| Bonamia grandiflora | Florida bonamia | Q26B | P01 | 4 | Threatened | Entire |
| Bonamia menziesii | No common name | Q1TQ | P01 | 1 | Endangered | Wherever found |
| Bos gaurus | Seledang | A029 | V01 | Foreign | Endangered | Wherever found |
| Bos javanicus | Banteng | A00Q | V01 | Foreign | Endangered | Wherever found |
| Bos mutus (=grunniens m.) | Wild yak | A02U | V01 | Foreign | Endangered | Wherever found |
| Bos sauveli | Kouprey | A01G | V01 | Foreign | Endangered | Wherever found |
| Brachylagus idahoensis | Pygmy Rabbit | A0GG | V01 | 1 | Endangered | Columbia Basin DPS (WA-Douglas, Grant, Lincoln, Adams, Benton Counties) |
| Brachylophus fasciatus | Fiji banded iguana | C02P | V01 | Foreign | Endangered | Wherever found |
| Brachylophus vitiensis | Fiji crested iguana | C02Q | V01 | Foreign | Endangered | Wherever found |
| Brachyramphus marmoratus | Marbled Murrelet | B08C | V01 | 1 | Threatened | U.S.A. (CA, OR, WA) |
| Brachyteles arachnoides | Woolly spider monkey | A01W | V01 | Foreign | Endangered | Wherever found |
| Bradypus torquatus | Brazilian three-toed sloth | A02C | V01 | Foreign | Endangered | Wherever found |
| Branchinecta conservatio | Conservancy fairy shrimp | K03D | I01 | 8 | Endangered | Wherever found |
| Branchinecta longiantenna | Longhorn fairy shrimp | K03E | I01 | 8 | Endangered | Wherever found |
| Branchinecta lynchi | Vernal pool fairy shrimp | K03G | I01 | 8 | Threatened | Wherever found |
| Branchinecta sandiegonensis | San Diego fairy shrimp | K049 | I01 | 8 | Endangered | Wherever found |
| Branta (=Nesochen) sandvicensis | Hawaiian goose | B00C | V01 | 1 | Threatened | Wherever found |
| Brickellia mosieri | Florida brickell-bush | Q09E | P01 | 4 | Endangered | Entire |
| Brighamia insignis | Olulu | Q1TR | P01 | 1 | Endangered | Wherever found |
| Brighamia rockii | Pua `ala | Q1TS | P01 | 1 | Endangered | Wherever found |
| Brodiaea filifolia | Thread-leaved brodiaea | Q09H | P01 | 8 | Threatened | Wherever found |
| Brodiaea pallida | Chinese Camp brodiaea | Q09J | P01 | 8 | Threatened | Wherever found |
| Brychius hungerfordi | Hungerford's crawling water Beetle | I02B | I01 | 3 | Endangered | Wherever found |
| Bubalus depressicornis | Lowland anoa | A00G | V01 | Foreign | Endangered | Wherever found |
| Bubalus mindorensis | Tamaraw | A03O | V01 | Foreign | Endangered | Wherever found |
| Bubalus quarlesi | Mountain anoa | A00H | V01 | Foreign | Endangered | Wherever found |
| Buceros (=Rhinoplax) vigil | Helmeted hornbill | B055 | V01 | Foreign | Endangered | Wherever found |
| Bufo houstonensis | Houston toad | D004 | V01 | 2 | Endangered | Wherever found |
| Bufo periglenes | Monte Verde golden toad | D00A | V01 | Foreign | Endangered | Wherever found |
| Bufo superciliaris | Cameroon toad | D009 | V01 | Foreign | Endangered | Wherever found |
| Bulbophyllum guamense | Cebello halumtano | Q3OU | P01 | 1 | Threatened | Wherever found |
| Burramys parvus | Mountain pygmy possum | A03F | V01 | Foreign | Endangered | Wherever found |
| Buteo galapagoensis | Galapagos hawk | B01T | V01 | Foreign | Endangered | Wherever found |
| Buteo platypterus brunnescens | Puerto Rican broad-winged hawk | B06Y | V01 | 4 | Endangered | Wherever found |
| Buxus vahlii | Vahl's boxwood | Q26G | P01 | 4 | Endangered | Wherever found |
| Cacajao spp. | Uakari (all species) | A02K | V01 | Foreign | Endangered | Wherever found |
| Cacatua alba | White cockatoo | B0GQ | V01 | Foreign | Threatened | Wherever found |
| Cacatua haematuropygia | Philippine cockatoo | B0GN | V01 | Foreign | Endangered | Wherever found |
| Cacatua moluccensis | Salmon-crested cockatoo | B0BS | V01 | Foreign | Threatened | Wherever found |
| Cacatua sulphurea | Yellow-crested cockatoo | B0GS | V01 | Foreign | Endangered | Wherever found |
| Caiman crocodilus apaporiensis | Apaporis River caiman | C00X | V01 | Foreign | Endangered | Wherever found |
| Caiman crocodilus crocodilus | Common caiman | C069 | V01 | Foreign | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Caiman crocodilus fuscus (includes Caiman crocodilus chiapasius) | Brown Caiman | C068 | V01 | Foreign | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Caiman latirostris | Broad-snouted caiman | C00Z | V02 | Foreign | Threatened | Argentina DPS |
| Caiman latirostris | Broad-snouted caiman | C00Z | V03 | Foreign | Endangered | Bolivia, Brazil, Paraguay, and Uruguay |
| Caiman yacare | Yacare Caiman | C004 | V01 | Foreign | Threatened | Wherever found |
| Cairina scutulata | White-winged wood duck | B01D | V01 | Foreign | Endangered | Wherever found |
| Calamagrostis expansa | Maui reedgrass | Q306 | P01 | 1 | Endangered | Wherever found |
| Calamagrostis hillebrandii | Hillebrand's reedgrass | Q3HF | P01 | 1 | Endangered | Wherever found |
| Calidris canutus rufa | rufa red knot | B0DM | V01 | 5 | Threatened | Wherever found |
| Callaeas cinerea | Kokako (wattlebird) | B020 | V01 | Foreign | Endangered | Wherever found |
| Callicarpa ampla | Capa rosa | Q26J | P01 | 4 | Endangered | Wherever found |
| Callimico goeldii | Goeldi's marmoset | A01Q | V01 | Foreign | Endangered | Wherever found |
| Callirhoe scabriuscula | Texas poppy-mallow | Q1TT | P01 | 2 | Endangered | Wherever found |
| Callithrix aurita (=jacchus a.) | White-eared (=buffy tufted-ear) marmoset | A0FL | V01 | Foreign | Endangered | Wherever found |
| Callithrix flaviceps | Buff-headed marmoset | A0A2 | V01 | Foreign | Endangered | Wherever found |
| Callophrys mossii bayensis | San Bruno elfin butterfly | I00Q | I01 | 8 | Endangered | Wherever found |
| Calochortus tiburonensis | Tiburon mariposa lily | Q1TU | P01 | 8 | Threatened | Wherever found |
| Caloprymnus campestris | Desert (=plain) rat-kangaroo | A03K | V01 | Foreign | Endangered | Wherever found |
| Calyptranthes thomasiana | No common name | Q26L | P01 | 4 | Endangered | Wherever found |
| Calyptridium pulchellum | Mariposa pussypaws | Q0AS | P01 | 8 | Threatened | Wherever found |
| Calyptronoma rivalis | Palma de manaca | Q26M | P01 | 4 | Threatened | Wherever found |
| Calystegia stebbinsii | Stebbins' morning-glory | Q0AU | P01 | 8 | Endangered | Wherever found |
| Camarhynchus pauper | Floreana tree-Finch | B0B6 | V01 | Foreign | Endangered | Wherever found |
| Cambarus aculabrum | Benton County cave crayfish | K02J | I01 | 4 | Endangered | Wherever found |
| Cambarus callainus | Big Sandy crayfish | K03K | I01 | 5 | Threatened | Wherever found |
| Cambarus cracens | Slenderclaw crayfish | K06B | I01 | 4 | Endangered | Wherever found |
| Cambarus veteranus | Guyandotte River crayfish | K08X | I01 | 5 | Endangered | Wherever found |
| Cambarus zophonastes | Hell Creek Cave crayfish | K02H | I01 | 4 | Endangered | Wherever found |
| Camelus bactrianus | Bactrian camel | A04U | V01 | Foreign | Endangered | Wherever found |
| Campanula robinsiae | Brooksville bellflower | Q1TV | P01 | 4 | Endangered | Entire |
| Campeloma decampi | Slender campeloma | G098 | I01 | 4 | Endangered | Wherever found |
| Campephilus imperialis | Imperial woodpecker | B03P | V01 | Foreign | Endangered | Wherever found |
| Campephilus principalis | Ivory-billed woodpecker | B03Q | V01 | 4 | Endangered | Wherever found |
| Canavalia molokaiensis | `Awikiwiki | Q1TX | P01 | 1 | Endangered | Wherever found |
| Canavalia napaliensis | `Awikiwiki | Q1TY | P01 | 1 | Endangered | Wherever found |
| Canavalia pubescens | `Awikiwiki | Q0BB | P01 | 1 | Endangered | Wherever found |
| Canis lupus | Gray wolf | A00D | V01 | 6 | Endangered | U.S.A.: All of AL, AR, CA, CO, CT, DE, FL, GA, IA, IN, IL, KS, KY, LA, MA, MD, ME, MI, MO, MS, NC, ND, NE, NH, NJ, NV, NY, OH, OK, PA, RI, SC, SD, TN, TX, VA, VT, WI, and WV; and portions of AZ, NM, OR, UT, and WA as follows: (1) Northern AZ (that portion north of the centerline of Interstate Highway 40); (2) Northern NM (that portion north of the centerline of Interstate Highway 40); (3) Western OR (that portion of OR west of the centerline of Highway 395 and Highway 78 north of Burns Junction and that portion of OR west of the centerline of Highway 95 south of Burns Junction); (4) Most of Utah (that portion of UT south and west of the centerline of Highway 84 and that portion of UT south of Highway 80 from Echo to the UT/WY Stateline); and (5) Western WA (that portion of WA west of the centerline of Highway 97 and Highway 17 north of Mesa and that portion of WA west of the centerline of Highway 395 south of Mesa). Mexico. |
| Canis lupus | Gray wolf | A00D | V02 | 3 | Threatened | U.S.A. (MN) |
| Canis lupus baileyi | Mexican wolf | A00E | V01 | 2 | Endangered | Wherever found, except where included in an experimental population as set forth in 17.84(k) |
| Canis rufus | Red wolf | A00F | V01 | 4 | Endangered | Wherever found, except where listed as an experimental population |
| Canis simensis | Simien fox | A07K | V01 | Foreign | Endangered | Wherever found |
| Cantharellus noumeae | No common name | P020 | I01 | NMFS | Endangered | Entire |
| Capra falconeri (=aegragrus) chiltanensis | Chiltan (=wild goat) markhor | A05B | V01 | Foreign | Endangered | Wherever found |
| Capra falconeri megaceros | Straight-horned markhor | A05R | V01 | Foreign | Threatened | Wherever found |
| Capra pyrenaica pyrenaica | Pyrenean ibex | A01C | V01 | Foreign | Endangered | Wherever found |
| Capra walie | Walia ibex | A01D | V01 | Foreign | Endangered | Wherever found |
| Caprolagus hispidus | Hispid hare | A05D | V01 | Foreign | Endangered | Wherever found |
| Capromys angelcabrerai | Cabrera's hutia | A0FH | V01 | Foreign | Endangered | Wherever found |
| Capromys auritus | Large-eared hutia | A0FJ | V01 | Foreign | Endangered | Wherever found |
| Capromys nana | Dwarf hutia | A0FI | V01 | Foreign | Endangered | Wherever found |
| Capromys sanfelipensis | Little earth hutia | A0FK | V01 | Foreign | Endangered | Wherever found |
| Caracara plancus audubonii | Crested caracara (Audubon''''s) [FL DPS] | B06Q | V01 | 4 | Threatened | U.S.A. (FL) |
| Cardamine micranthera | Small-anthered bittercress | Q1U0 | P01 | 4 | Endangered | Wherever found |
| Carduelis cucullata | Red siskin | B05N | V01 | Foreign | Endangered | Wherever found |
| Caretta caretta | Loggerhead sea turtle | C00U | V02 | 4 | Threatened | Northwest Atlantic Ocean DPS - Loggerhead sea turtles originating from the Northwest Atlantic Ocean west of 40 degrees W. Long |
| Caretta caretta | Loggerhead sea turtle | C00U | V03 | 1 | Endangered | North Pacific Ocean DPS - Loggerhead sea turtles originating from the North Pacific north of the equator and south of 60 degrees N. Lat |
| Caretta caretta | Loggerhead sea turtle | C00U | V04 | Foreign | Endangered | Mediterranean Sea DPS - Loggerhead sea turtles originating from the Mediterranean Sea east of 5 degrees 36 minues W. Long. |
| Caretta caretta | Loggerhead sea turtle | C00U | V05 | Foreign | Endangered | North Indian Ocean DPS - Loggerhead sea turtles originating from the North Indian Ocean north of the equator and south of 30? N. Lat |
| Caretta caretta | Loggerhead sea turtle | C00U | V06 | Foreign | Endangered | Northeast Atlantic Ocean DPS - Loggerhead sea turtles originating from the Northeast Atlantic Ocean north of the equator, south of 60 degrees N. Lat., and east of 40 degrees W. Long., except in the vicinity of the Strait of Gibraltar where the eastern boundary is 5 degrees 36 minutes W. Long |
| Caretta caretta | Loggerhead sea turtle | C00U | V07 | Foreign | Threatened | Loggerhead sea turtles originating from the South Atlantic Ocean south of the equator, north of 60 degrees S. Lat., west of 20 degrees E. Long., and east of 67 degrees W. Long |
| Caretta caretta | Loggerhead sea turtle | C00U | V08 | Foreign | Endangered | Loggerhead sea turtles originating from the South Pacific south of the equator, north of 60 degrees S. Lat., west of 67 degrees W. Long., and east of 141 degrees E. Long. |
| Caretta caretta | Loggerhead sea turtle | C00U | V09 | Foreign | Threatened | Loggerhead sea turtles originating from the Southeast Indian Ocean south of the equator, north of 60 degrees S. Lat., and east of 80 degrees E. Long.; South Pacific Ocean south of the equator, north of 60degrees S. Lat., and west of 141 degrees E. Long |
| Caretta caretta | Loggerhead sea turtle | C00U | V10 | Foreign | Threatened | Loggerhead sea turtles originating from the Southwest Indian Ocean north of the equator, south of 30 degrees N. Lat., east of 20 degrees E. Long., and west of 80 degrees E. Long. |
| Carex albida | White sedge | Q0BL | P01 | 8 | Endangered | Wherever found |
| Carex lutea | Golden sedge | Q3HD | P01 | 4 | Endangered | Wherever found |
| Carex specuicola | Navajo sedge | Q1U1 | P01 | 2 | Threatened | Wherever found |
| Casarea dussumieri | Round Island casarea boa | C02O | V01 | Foreign | Endangered | Wherever found |
| Castilleja affinis ssp. neglecta | Tiburon paintbrush | Q26R | P01 | 8 | Endangered | Wherever found |
| Castilleja campestris ssp. succulenta | Fleshy owl's-clover | Q0CG | P01 | 8 | Threatened | Wherever found |
| Castilleja cinerea | Ash-grey paintbrush | Q0CL | P01 | 8 | Threatened | Wherever found |
| Castilleja mollis | Soft-leaved paintbrush | Q0D1 | P01 | 8 | Endangered | Wherever found |
| Castor fiber birulai | Beaver (Mongolian) | A04R | V01 | Foreign | Endangered | Wherever found |
| Catesbaea melanocarpa | No common name | Q30M | P01 | 4 | Endangered | Wherever found |
| Catopuma (=Felis) temminckii | Asian golden (=Temmnick's) cat | A050 | V01 | Foreign | Endangered | Wherever found |
| Catostomus discobolus yarrowi | Zuni bluehead Sucker | E063 | V01 | 2 | Endangered | Wherever found |
| Catostomus santaanae | Santa Ana sucker | E07W | V01 | 8 | Threatened | Los Angeles River basin, San Gabriel River basin, Santa Ana River basin |
| Catostomus warnerensis | Warner sucker | E057 | V01 | 1 | Threatened | Wherever found |
| Catreus wallichii | Cheer pheasant | B06J | V01 | Foreign | Endangered | Wherever found |
| Caulanthus californicus | California jewelflower | Q2Y8 | P01 | 8 | Endangered | Wherever found |
| Ceanothus ferrisae | Coyote ceanothus | Q1U3 | P01 | 8 | Endangered | Wherever found |
| Ceanothus ophiochilus | Vail Lake ceanothus | Q3AH | P01 | 8 | Threatened | Wherever found |
| Ceanothus roderickii | Pine Hill ceanothus | Q0DK | P01 | 8 | Endangered | Wherever found |
| Cenchrus agrimonioides | Kamanomano | Q1U4 | P01 | 1 | Endangered | Wherever found |
| Centaurium namophilum | Spring-loving centaury | Q1U5 | P01 | 8 | Threatened | Wherever found |
| Centrocercus minimus | Gunnison sage-grouse | B0B0 | V01 | 6 | Threatened | Wherever found |
| Cephalophus jentinki | Jentink's duiker | A07I | V01 | Foreign | Endangered | Wherever found |
| Cephalorhynchus hectori hectori | South Island Hector's dolphin | A0LD | V01 | NMFS | Threatened | Entire |
| Cephalorhynchus hectori maui | Maui dolphin | A0LC | V01 | NMFS | Endangered | Entire |
| Ceratotherium simum cottoni | Northern white rhinoceros | A025 | V01 | Foreign | Endangered | Zaire, Uganda, Sudan, Central African Republic |
| Ceratotherium simum ssp. simum | Southern white rhinoceros | A0KU | V01 | Foreign | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Cercocarpus traskiae | Catalina Island mountain-mahogany | Q0DQ | P01 | 8 | Endangered | Wherever found |
| Cercocebus galeritus galeritus | Tana River mangabey | A01P | V01 | Foreign | Endangered | Wherever found |
| Cercocebus torquatus | White-collared mangabey | A06P | V01 | Foreign | Endangered | Wherever found |
| Cercopithecus diana | Diana monkey | A06T | V01 | Foreign | Endangered | Wherever found |
| Cercopithecus erythrogaster | Red-bellied monkey | A06V | V01 | Foreign | Endangered | Wherever found |
| Cercopithecus erythrotis | Red-eared nose-spotted monkey | A06W | V01 | Foreign | Endangered | Wherever found |
| Cercopithecus lhoesti | L'hoest's monkey | A06U | V01 | Foreign | Endangered | Wherever found |
| Cereus eriophorus var. fragrans | Fragrant prickly-apple | Q1U6 | P01 | 4 | Endangered | Entire |
| Cervus alfredi | Visayan deer | A0FT | V01 | Foreign | Endangered | Wherever found |
| Cervus duvauceli | Swamp deer | A00Y | V01 | Foreign | Endangered | Wherever found |
| Cervus elaphus bactrianus | Bactrian deer | A053 | V01 | Foreign | Endangered | Wherever found |
| Cervus elaphus barbarus | Barbary deer | A054 | V01 | Foreign | Endangered | Wherever found |
| Cervus elaphus corsicanus | Corsican red deer | A07B | V01 | Foreign | Endangered | Wherever found |
| Cervus elaphus hanglu | Kashmir stag | A02X | V01 | Foreign | Endangered | Wherever found |
| Cervus elaphus macneilii | McNeill's deer | A00W | V01 | Foreign | Endangered | Wherever found |
| Cervus elaphus wallichi | Shou | A02B | V01 | Foreign | Endangered | Wherever found |
| Cervus elaphus yarkandensis | Yarkand deer | A07H | V01 | Foreign | Endangered | Wherever found |
| Cervus eldi | Eld's brow-antlered Deer | A00U | V01 | Foreign | Endangered | Wherever found |
| Cervus nippon grassianus | Shansi sika deer | A07F | V01 | Foreign | Endangered | Wherever found |
| Cervus nippon keramae | Ryukyu sika deer | A07E | V01 | Foreign | Endangered | Wherever found |
| Cervus nippon kopschi | South China sika deer | A07G | V01 | Foreign | Endangered | Wherever found |
| Cervus nippon mandarinus | North China sika deer | A07D | V01 | Foreign | Endangered | Wherever found |
| Cervus nippon taiouanus | Formosan sika deer | A07C | V01 | Foreign | Endangered | Wherever found |
| Chaeropus ecaudatus | Pig-footed bandicoot | A030 | V01 | Foreign | Endangered | Wherever found |
| Chaetocercus berlepschi | Esmeraldas woodstar | B0BP | V01 | Foreign | Endangered | Wherever found |
| Chaetomys subspinosus | Thin-spined porcupine | A021 | V01 | Foreign | Endangered | Wherever found |
| Chamaecrista glandulosa var. mirabilis | No common name | Q26W | P01 | 4 | Endangered | Wherever found |
| Chamaecrista lineata keyensis | Big Pine partridge pea | Q0E3 | P01 | 4 | Endangered | Entire |
| Chamaesyce deltoidea pinetorum | Pineland sandmat | Q3HI | P01 | 4 | Threatened | Entire |
| Chamaesyce deltoidea serpyllum | Wedge spurge | Q0E7 | P01 | 4 | Endangered | Entire |
| Chamaesyce deltoidea ssp. deltoidea | Deltoid spurge | Q26X | P01 | 4 | Endangered | Entire |
| Chamaesyce garberi | Garber's spurge | Q1U9 | P01 | 4 | Threatened | Entire |
| Chamaesyce hooveri | Hoover's spurge | Q0E9 | P01 | 8 | Threatened | Wherever found |
| Charadrius melodus | Piping Plover | B079 | V01 | 3 | Endangered | [Great Lakes watershed DPS] - Great Lakes, watershed in States of IL, IN, MI, MN, NY, OH, PA, and WI and Canada (Ont.) |
| Charadrius melodus | Piping Plover | B079 | V02 | 5 | Threatened | [Atlantic Coast and Northern Great Plains populations] - Wherever found, except those areas where listed as endangered. |
| Charadrius nivosus nivosus | Western Snowy Plover | B07C | V01 | 8 | Threatened | Pacific Coast population DPS-U.S.A. (CA, OR, WA), Mexico (within 50 miles of Pacific coast) |
| Charpentiera densiflora | Papala | Q0EF | P01 | 1 | Endangered | Wherever found |
| Chasiempis ibidis | Oahu elepaio | B0AL | V01 | 1 | Endangered | Wherever found |
| Chasmistes brevirostris | Shortnose Sucker | E055 | V01 | 8 | Endangered | Wherever found |
| Chasmistes cujus | Cui-ui | E001 | V01 | 8 | Endangered | Wherever found |
| Chasmistes liorus | June sucker | E050 | V01 | 6 | Threatened | Wherever found |
| Chelonia mydas | Green sea turtle | C00S | V03 | 1 | Threatened | Green sea turtles originating from the Central North Pacific Ocean, bounded by the following coordinates: 41 degrees N., 169 degrees E. in the northwest; 41 degrees N., 143 degrees W. in the northeast; 9 degrees N., 125 degrees W. in the southeast; and 9 degrees N., 175 degrees W. in the southwest Pacific coast of Mexico |
| Chelonia mydas | Green sea turtle | C00S | V04 | 1 | Endangered | Green sea turtles originating from the Central South Pacific Ocean, bounded by the following coordinates: 9 degrees N., 175 degrees W. in the northwest; 9 degrees N., 125 degrees W. in the northeast; 40 degrees S., 96 degrees W. in the southeast; 40 degrees S., 176 degrees E. in the southwest; and 13 degrees S., 171 degrees E. in the west |
| Chelonia mydas | Green sea turtle | C00S | V05 | 1 | Endangered | Green sea turtles originating from the Central West Pacific Ocean, bounded by the following coordinates: 41 degrees N., 146 degrees E. in the northwest; 41 degrees N., 169 degrees E. in the northeast; 9 degrees N., 175 degrees W. in the east; 13 degrees S., 171 degrees E. in the southeast; along the northern coast of the island of New Guinea; and 4.5 degrees N., 129 degrees E. in the west |
| Chelonia mydas | Green sea turtle | C00S | V06 | Foreign | Threatened | Green sea turtles originating from the Eastern Indian and Western Pacific Oceans, bounded by the following lines and coordinates: 41 degrees N. Lat. in the north, 41 degrees N., 146 degrees E. in the northeast; 4.5 degrees N., 129 degrees E. in the southeast; along the southern coast of the island of New Guinea; along the western coast of Australia (west of 142 degrees E. Long.); 40 degrees S. Lat. in the south; and 84 degrees E. Long. in the east |
| Chelonia mydas | Green sea turtle | C00S | V07 | Foreign | Endangered | Green sea turtles originating from the Mediterranean Sea, bounded by 5.5 degrees W. Long. in the west |
| Chelonia mydas | Green sea turtle | C00S | V08 | Foreign | Threatened | Green sea turtles originating from the North Indian Ocean, bounded by: Africa and Asia in the west and north; 84 degrees E. Long. in the east; and the equator in the south |
| Chelonia mydas | Green sea turtle | C00S | V09 | Foreign | Threatened | Green sea turtles originating from the Southwest Indian Ocean, bounded by the following lines: the equator to the north; 84 degrees E. Long. to the east; 40 degrees S. Lat. to the south; and 19 degrees E. Long (and along the eastern coast of Africa) in the west |
| Chelonia mydas | Green sea turtle | C00S | V10 | Foreign | Threatened | Green sea turtles originating from the Southwest Pacific Ocean, bounded by the following lines and coordinates: along the southern coast of the island of New Guinea and the Torres Strait (east of 142 degrees E Long.); 13 degrees S., 171 degrees E. in the northeast; 40 degrees S., 176 degrees E. in the southeast; and 40 degrees S., 142 degrees E. in the southwest |
| Chelonia mydas | Green sea turtle | C00S | V11 | 8 | Threatened | Green sea turtles originating from the East Pacific Ocean, bounded by the following lines and coordinates: 41 degrees N., 143 degrees W. in the northwest; 41 degrees N. Lat. in the north; along the western coasts of the Americas; 40 degrees S. Lat. in the south; and 40 degrees S., 96 degrees W. in the southwest |
| Chelonia mydas | Green sea turtle | C00S | V12 | 4 | Threatened | Green sea turtles originating from the North Atlantic Ocean, bounded by the following lines and coordinates: 48 degrees N. Lat. in the north, along the western coasts of Europe and Africa (west of 5.5 degrees W. Long.); north of 19 degrees N. Lat. in the east; bounded by 19 degrees N., 65.1 degrees W. to 14 degrees N., 65.1 degrees W. then 14 degrees N., 77 degrees W. in the south and west; and along the eastern coasts of the Americas (north of 7.5 degrees N., 77 degrees W.) |
| Chelonia mydas | Green sea turtle | C00S | V13 | 4 | Threatened | Green sea turtles originating from the South Atlantic Ocean, bounded by the following lines and coordinates: along the northern and eastern coasts of South America (east of 7.5 degrees N., 77 degrees W.); 14 degrees N., 77 degrees W. to 14 degrees N., 65.1 degrees W. to 19 degrees N., 65.1 degrees W. in the north and west; 19 degrees N. Lat. in the northeast; 40 degrees S., 19 degrees E. in the southeast; and 40 degrees S. Lat. in the south |
| Chilabothrus granti | Virgin Islands tree boa | C02E | V01 | 4 | Endangered | Wherever found |
| Chilabothrus inornatus | Puerto Rican boa | C00P | V01 | 4 | Endangered | Wherever found |
| Chinchilla chinchilla boliviana | Bolivian short-tailed chinchilla | A052 | V01 | Foreign | Endangered | Wherever found |
| Chionanthus pygmaeus | Pygmy fringe-tree | Q26Y | P01 | 4 | Endangered | Entire |
| Chiropotes albinasus | White-nosed saki | A027 | V01 | Foreign | Endangered | Wherever found |
| Chiropotes satanas satanas | Southern bearded saki | A0FN | V01 | Foreign | Endangered | Wherever found |
| Chlamyphorus truncatus | Pink fairy armadillo | A00L | V01 | Foreign | Endangered | Wherever found |
| Chlorogalum purpureum | Purple amole | Q0ET | P01 | 8 | Threatened | Wherever found |
| Chondrohierax uncinatus mirus | Grenada hook-billed kite | B01Z | V01 | Foreign | Endangered | Wherever found |
| Chondrohierax uncinatus wilsonii | Cuba hook-billed kite | B03U | V01 | Foreign | Endangered | Wherever found |
| Chorizanthe howellii | Howell's spineflower | Q270 | P01 | 8 | Endangered | Wherever found |
| Chorizanthe orcuttiana | Orcutt's spineflower | Q0EY | P01 | 8 | Endangered | Wherever found |
| Chorizanthe pungens var. hartwegiana | Ben Lomond spineflower | Q30Y | P01 | 8 | Endangered | Wherever found |
| Chorizanthe pungens var. pungens | Monterey spineflower | Q271 | P01 | 8 | Threatened | Wherever found |
| Chorizanthe robusta var. hartwegii | Scotts Valley spineflower | Q3IB | P01 | 8 | Endangered | Wherever found |
| Chorizanthe robusta var. robusta | Robust spineflower | Q3O7 | P01 | 8 | Endangered | Wherever found |
| Chorizanthe valida | Sonoma spineflower | Q1UF | P01 | 8 | Endangered | Wherever found |
| Chromolaena frustrata | Cape Sable Thoroughwort | Q3HJ | P01 | 4 | Endangered | Entire |
| Chrosomus saylori | Laurel dace | E0AR | V01 | 4 | Endangered | Wherever found |
| Chrysocyon brachyurus | Maned wolf | A03U | V01 | Foreign | Endangered | Wherever found |
| Cichlherminia iherminieri santaeluciae | St. Lucia Forest thrush | B0D4 | V01 | Foreign | Endangered | Wherever found |
| Cicindela nevadica lincolniana | Salt Creek Tiger beetle | I0QR | I01 | 6 | Endangered | Wherever found |
| Cicindela ohlone | Ohlone tiger beetle | I0OW | I01 | 8 | Endangered | Wherever found |
| Cicindelidia floridana | Miami tiger beetle | I0XA | I01 | 4 | Endangered | Wherever found |
| Ciconia boyciana (=ciconia b.) | Oriental white stork | B03C | V01 | Foreign | Endangered | Wherever found |
| Cicurina baronia | Robber Baron Cave Meshweaver | J01A | I01 | 2 | Endangered | Wherever found |
| Cicurina madla | Madla Cave Meshweaver | J019 | I01 | 2 | Endangered | Wherever found |
| Cicurina vespera | Government Canyon Bat Cave meshweaver | J01B | I01 | 2 | Endangered | Wherever found |
| Cinclocerthia ruficauda gutturalis | Martinique trembler (thrasher) | B03F | V01 | Foreign | Endangered | Wherever found |
| Cinclodes aricomae | Royal cinclodes | B0BM | V01 | Foreign | Endangered | Wherever found |
| Cirsium fontinale var. fontinale | Fountain thistle | Q1UH | P01 | 8 | Endangered | Wherever found |
| Cirsium fontinale var. obispoense | Chorro Creek bog thistle | Q1UG | P01 | 8 | Endangered | Wherever found |
| Cirsium hydrophilum var. hydrophilum | Suisun thistle | Q0FC | P01 | 8 | Endangered | Wherever found |
| Cirsium loncholepis | La Graciosa thistle | Q0FE | P01 | 8 | Endangered | Wherever found |
| Cirsium pitcheri | Pitcher's thistle | Q276 | P01 | 3 | Threatened | Wherever found |
| Cirsium vinaceum | Sacramento Mountains thistle | Q277 | P01 | 2 | Threatened | Wherever found |
| Cirsium wrightii | Wright's marsh thistle | Q3N3 | P01 | 2 | Threatened | Entire |
| Cladonia perforata | Florida perforate cladonia | U000 | P01 | 4 | Endangered | Entire |
| Clarkia franciscana | Presidio clarkia | Q1UI | P01 | 8 | Endangered | Wherever found |
| Clarkia imbricata | Vine Hill clarkia | Q0FO | P01 | 8 | Endangered | Wherever found |
| Clarkia speciosa ssp. immaculata | Pismo clarkia | Q1UJ | P01 | 8 | Endangered | Wherever found |
| Clarkia springvillensis | Springville clarkia | Q2O6 | P01 | 8 | Threatened | Wherever found |
| Clematis morefieldii | Morefield''s leather flower | Q315 | P01 | 4 | Endangered | Entire |
| Clematis socialis | Alabama leather flower | Q2SM | P01 | 4 | Endangered | Wherever found |
| Clermontia drepanomorpha | `Oha wai | Q0G6 | P01 | 1 | Endangered | Wherever found |
| Clermontia lindseyana | `Oha wai | Q1UL | P01 | 1 | Endangered | Wherever found |
| Clermontia oblongifolia ssp. brevipes | `Oha wai | Q317 | P01 | 1 | Endangered | Wherever found |
| Clermontia oblongifolia ssp. mauiensis | `Oha wai | Q318 | P01 | 1 | Endangered | Wherever found |
| Clermontia peleana | `Oha wai | Q1UM | P01 | 1 | Endangered | Wherever found |
| Clermontia pyrularia | `Oha wai | Q1UN | P01 | 1 | Endangered | Wherever found |
| Clermontia samuelii | `Oha wai | Q3H1 | P01 | 1 | Endangered | Wherever found |
| Clitoria fragrans | Pigeon wings | Q27C | P01 | 4 | Threatened | Entire |
| Cnemidophorus vanzoi | Maria Island ground lizard | C055 | V01 | Foreign | Endangered | Wherever found |
| Coccyzus americanus | Yellow-billed Cuckoo | B06R | V01 | 2 | Threatened | Western DPS: U.S.A. (AZ, CA, CO (western), ID, MT (western), NM (western), NV, OR, TX (western), UT, WA, WY (western)); Canada (British Columbia (southwestern); Mexico (Baja California, Baja California Sur, Chihuahua, Durango (western), Sinaloa, Sonora) |
| Colinus virginianus ridgwayi | Masked bobwhite (quail) | B00Z | V01 | 2 | Endangered | Wherever found |
| Colobus satanas | Black colobus monkey | A06R | V01 | Foreign | Endangered | Wherever found |
| Colubrina oppositifolia | Kauila | Q1UO | P01 | 1 | Endangered | Wherever found |
| Columba junoniae | White-tailed laurel Pigeon | B0A1 | V01 | Foreign | Threatened | Wherever found |
| Columba mayeri | Pink pigeon | B0A0 | V01 | Foreign | Endangered | Wherever found |
| Columba palumbus azorica | Azores wood pigeon | B02Y | V01 | Foreign | Endangered | Wherever found |
| Conolophus pallidus | Barrington land iguana | C00D | V01 | Foreign | Endangered | Wherever found |
| Conradina brevifolia | Short-leaved rosemary | Q1UP | P01 | 4 | Endangered | Entire |
| Conradina etonia | Etonia rosemary | Q3AG | P01 | 4 | Endangered | Entire |
| Conradina glabra | Apalachicola rosemary | Q1UQ | P01 | 4 | Endangered | Entire |
| Conradina verticillata | Cumberland rosemary | Q1UR | P01 | 4 | Threatened | Wherever found |
| Conraua goliath | Goliath Frog | D02C | V01 | Foreign | Threatened | Wherever found |
| Consolea corallicola | Florida semaphore Cactus | Q3HT | P01 | 4 | Endangered | Entire |
| Copsychus niger cebuensis | Cebu black shama (thrush) | B039 | V01 | Foreign | Endangered | Wherever found |
| Copsychus sechellarum | Seychelles magpie-robin (thrush) | B021 | V01 | Foreign | Endangered | Wherever found |
| Coquus newtoni | Reunion cuckoo-shrike | B018 | V01 | Foreign | Endangered | Wherever found |
| Coquus typicus | Mauritius cuckoo-shrike | B017 | V01 | Foreign | Endangered | Wherever found |
| Coracopsis nigra barklyi | Seychelles lesser vasa parrot | B09X | V01 | Foreign | Endangered | Wherever found |
| Cordia bellonis | No common name | Q27F | P01 | 4 | Endangered | Wherever found |
| Cordylanthus maritimus ssp. maritimus | Salt marsh bird's-beak | Q1US | P01 | 8 | Endangered | Wherever found |
| Cordylanthus mollis ssp. mollis | Soft bird's-beak | Q0GT | P01 | 8 | Endangered | Wherever found |
| Cordylanthus palmatus | Palmate-bracted bird's beak | Q1UT | P01 | 8 | Endangered | Wherever found |
| Cordylanthus tenuis ssp. capillaris | Pennell's bird's-beak | Q2O8 | P01 | 8 | Endangered | Wherever found |
| Coreobagrus ichikawai | Nekogigi (catfish) | E00O | V01 | Foreign | Endangered | Wherever found |
| Cornutia obovata | Palo de nigua | Q27I | P01 | 4 | Endangered | Wherever found |
| Corvus hawaiiensis | Hawaiian crow | B004 | V01 | 1 | Endangered | Wherever found |
| Corvus kubaryi | Mariana (=aga) Crow | B05X | V01 | 1 | Endangered | Wherever found |
| Corvus leucognaphalus | White-necked crow | B08A | V01 | 4 | Endangered | Wherever found |
| Corynorhinus (=Plecotus) townsendii ingens | Ozark big-eared bat | A075 | V01 | 2 | Endangered | Wherever found |
| Corynorhinus (=Plecotus) townsendii virginianus | Virginia big-eared bat | A080 | V01 | 5 | Endangered | Wherever found |
| Coryphantha ramillosa | Bunched cory cactus | Q1UV | P01 | 2 | Threatened | Wherever found |
| Coryphantha robbinsorum | Cochise pincushion cactus | Q27L | P01 | 2 | Threatened | Wherever found |
| Coryphantha scheeri var. robustispina | Pima pineapple cactus | Q27M | P01 | 2 | Endangered | Wherever found |
| Coryphantha sneedii var. leei | Lee pincushion cactus | Q1UW | P01 | 2 | Threatened | Wherever found |
| Coryphantha sneedii var. sneedii | Sneed pincushion cactus | Q1UX | P01 | 2 | Endangered | Wherever found |
| Cotinga maculata | Banded cotinga | B04R | V01 | Foreign | Endangered | Wherever found |
| Cottus paulus (=pygmaeus) | Pygmy Sculpin | E01L | V01 | 4 | Threatened | Wherever found |
| Cottus specus | Grotto Sculpin | E0AC | V01 | 3 | Endangered | Wherever found |
| Cranichis ricartii | No common name | Q3A8 | P01 | 4 | Endangered | Wherever found |
| Craseonycteris thonglongyai | Bumblebee bat | A09X | V01 | Foreign | Endangered | Wherever found |
| Crax alberti | Blue-billed curassow | B0BX | V01 | Foreign | Endangered | Wherever found |
| Crax blumenbachii | Red-billed curassow | B040 | V01 | Foreign | Endangered | Wherever found |
| Crenichthys baileyi baileyi | White River springfish | E04U | V01 | 8 | Endangered | Wherever found |
| Crenichthys baileyi grandis | Hiko White River springfish | E04Q | V01 | 8 | Endangered | Wherever found |
| Crenichthys nevadae | Railroad Valley springfish | E04T | V01 | 8 | Threatened | Wherever found |
| Crescentia portoricensis | Higuero de sierra | Q27R | P01 | 4 | Endangered | Wherever found |
| Crocodylus acutus | American crocodile | C02J | V01 | 4 | Threatened | U.S.A. (FL) |
| Crocodylus acutus | American crocodile | C02J | V02 | Foreign | Endangered | Wherever found, except in U.S.A. (FL) |
| Crocodylus cataphractus | African slender-snouted crocodile | C00Q | V01 | Foreign | Endangered | Wherever found |
| Crocodylus intermedius | Orinoco crocodile | C008 | V01 | Foreign | Endangered | Wherever found |
| Crocodylus niloticus | Nile crocodile | C007 | V01 | Foreign | Threatened | Wherever found |
| Crocodylus novaeguineae mindorensis | Philippine crocodile | C014 | V01 | Foreign | Endangered | Wherever found |
| Crocodylus palustris kimbula | Ceylon mugger crocodile | C011 | V01 | Foreign | Endangered | Wherever found |
| Crocodylus palustris palustris | Mugger crocodile | C013 | V01 | Foreign | Endangered | Wherever found |
| Crocodylus porosus | Saltwater crocodile | C02K | V01 | Foreign | Endangered | Wherever found, except Papua New Guinea and Australia |
| Crocodylus porosus | Saltwater crocodile | C02K | V02 | Foreign | Threatened | Australia |
| Crocodylus rhombifer | Cuban crocodile | C005 | V01 | Foreign | Endangered | Wherever found |
| Crocodylus siamensis | Siamese crocodile | C015 | V01 | Foreign | Endangered | Wherever found |
| Crossoptilon crossoptilon | White eared pheasant | B042 | V01 | Foreign | Endangered | Wherever found |
| Crossoptilon mantchuricum | Brown eared pheasant | B02P | V01 | Foreign | Endangered | Wherever found |
| Crotalaria avonensis | Avon Park harebells | Q31F | P01 | 4 | Endangered | Entire |
| Crotalus unicolor | Aruba Island rattlesnake | C035 | V01 | Foreign | Threatened | Wherever found |
| Crotalus willardi obscurus | New Mexican ridge-nosed rattlesnake | C01S | V01 | 2 | Threatened | Wherever found |
| Cryptantha crassipes | Terlingua Creek cat's-eye | Q27U | P01 | 2 | Endangered | Wherever found |
| Cryptobranchus alleganiensis | Eastern Hellbender | D043 | V02 | 3 | Endangered | Missouri DPS |
| Cryptobranchus alleganiensis bishopi | Ozark Hellbender | D032 | V01 | 3 | Endangered | Wherever found |
| Crystallaria cincotta | diamond Darter | E014 | V01 | 5 | Endangered | Wherever found |
| Ctenitis squamigera | Pauoa | S01I | P01 | 1 | Endangered | Wherever found |
| Cucurbita okeechobeensis ssp. okeechobeensis | Okeechobee gourd | Q280 | P01 | 4 | Endangered | Entire |
| Cumberlandia monodonta | Spectaclecase (mussel) | F00X | I01 | 3 | Endangered | Wherever found |
| Cuon alpinus | Dhole | A00Z | V01 | Foreign | Endangered | Wherever found |
| Cupressus abramsiana | Santa Cruz cypress | R005 | P01 | 8 | Threatened | Wherever found |
| Cupressus goveniana ssp. goveniana | Gowen cypress | R00A | P01 | 8 | Threatened | Wherever found |
| Cyanea acuminata | Haha | Q3GJ | P01 | 1 | Endangered | Wherever found |
| Cyanea asarifolia | Haha | Q31J | P01 | 1 | Endangered | Wherever found |
| Cyanea asplenifolia | Haha | Q1V0 | P01 | 1 | Endangered | Wherever found |
| Cyanea calycina | Haha | Q1LP | P01 | 1 | Endangered | Wherever found |
| Cyanea copelandii ssp. copelandii | Haha | Q31K | P01 | 1 | Endangered | Wherever found |
| Cyanea copelandii ssp. haleakalaensis | Haha | Q3GV | P01 | 1 | Endangered | Wherever found |
| Cyanea crispa | haha | Q1V1 | P01 | 1 | Endangered | Wherever found |
| Cyanea dolichopoda | Haha | Q3MS | P01 | 1 | Endangered | Wherever found |
| Cyanea dunbariae | haha | Q31L | P01 | 1 | Endangered | Wherever found |
| Cyanea duvalliorum | haha | Q3NS | P01 | 1 | Endangered | Wherever found |
| Cyanea eleeleensis | Haha | Q3HA | P01 | 1 | Endangered | Wherever found |
| Cyanea gibsonii | haha | Q2SU | P01 | 1 | Endangered | Wherever found |
| Cyanea glabra | Haha | Q31M | P01 | 1 | Endangered | Wherever found |
| Cyanea grimesiana ssp. grimesiana | Haha | Q1V2 | P01 | 1 | Endangered | Wherever found |
| Cyanea grimesiana ssp. obatae | Haha | Q2SR | P01 | 1 | Endangered | Wherever found |
| Cyanea hamatiflora ssp. carlsonii | Haha | Q2SS | P01 | 1 | Endangered | Wherever found |
| Cyanea hamatiflora ssp. hamatiflora | Haha | Q3GW | P01 | 1 | Endangered | Wherever found |
| Cyanea horrida | haha nui | Q3NT | P01 | 1 | Endangered | Wherever found |
| Cyanea humboldtiana | Haha | Q0IN | P01 | 1 | Endangered | Wherever found |
| Cyanea kauaulaensis | No common name | Q3OI | P01 | 1 | Endangered | Wherever found |
| Cyanea kolekoleensis | Haha | Q3MT | P01 | 1 | Endangered | Wherever found |
| Cyanea koolauensis | Haha | Q3GP | P01 | 1 | Endangered | Wherever found |
| Cyanea kuhihewa | Haha | Q3H2 | P01 | 1 | Endangered | Wherever found |
| Cyanea kunthiana | Haha | Q0IO | P01 | 1 | Endangered | Wherever found |
| Cyanea lanceolata | Haha | Q0IP | P01 | 1 | Endangered | Wherever found |
| Cyanea lobata | Haha | Q2ST | P01 | 1 | Endangered | Wherever found |
| Cyanea longiflora | Haha | Q3GQ | P01 | 1 | Endangered | Wherever found |
| Cyanea magnicalyx | haha | Q3NU | P01 | 1 | Endangered | Wherever found |
| Cyanea mannii | Haha | Q31P | P01 | 1 | Endangered | Wherever found |
| Cyanea maritae | haha | Q3NV | P01 | 1 | Endangered | Wherever found |
| Cyanea marksii | Haha | Q0IS | P01 | 1 | Endangered | Wherever found |
| Cyanea mauiensis | haha | Q3NW | P01 | 1 | Endangered | Wherever found |
| Cyanea mceldowneyi | Haha | Q1V3 | P01 | 1 | Endangered | Wherever found |
| Cyanea munroi | haha | Q3NX | P01 | 1 | Endangered | Wherever found |
| Cyanea obtusa | Haha | Q31Q | P01 | 1 | Endangered | Wherever found |
| Cyanea pinnatifida | Haha | Q284 | P01 | 1 | Endangered | Wherever found |
| Cyanea platyphylla | `aku`aku | Q285 | P01 | 1 | Endangered | Wherever found |
| Cyanea procera | Haha | Q31S | P01 | 1 | Endangered | Wherever found |
| Cyanea profuga | Haha | Q31T | P01 | 1 | Endangered | Wherever found |
| Cyanea purpurellifolia | Haha | Q1LR | P01 | 1 | Endangered | Wherever found |
| Cyanea recta | Haha | Q31V | P01 | 1 | Threatened | Wherever found |
| Cyanea remyi | Haha | Q3GK | P01 | 1 | Endangered | Wherever found |
| Cyanea rivularis | Haha | Q0LV | P01 | 1 | Endangered | Wherever found |
| Cyanea shipmanii | Haha | Q1V4 | P01 | 1 | Endangered | Wherever found |
| Cyanea solanacea | Popolo | Q0IV | P01 | 1 | Endangered | Wherever found |
| Cyanea stictophylla | Haha | Q286 | P01 | 1 | Endangered | Wherever found |
| Cyanea st.-johnii | Haha | Q1V5 | P01 | 1 | Endangered | Wherever found |
| Cyanea superba | Haha | Q1V6 | P01 | 1 | Endangered | Wherever found |
| Cyanea tritomantha | `aku | Q0IX | P01 | 1 | Endangered | Wherever found |
| Cyanea truncata | Haha | Q31W | P01 | 1 | Endangered | Wherever found |
| Cyanea undulata | Haha | Q31X | P01 | 1 | Endangered | Wherever found |
| Cyanopsitta spixii | Little blue macaw | B058 | V01 | Foreign | Endangered | Wherever found |
| Cyanoramphus auriceps forbesi | Forbes' parakeet | B02A | V01 | Foreign | Endangered | Wherever found |
| Cyanoramphus cookii (=novaezelandiae c.) | Norfolk Island parakeet | B06G | V01 | Foreign | Endangered | Wherever found |
| Cyathea dryopteroides | Elfin tree fern | S01J | P01 | 4 | Endangered | Wherever found |
| Cycas micronesica | Fadang | R00P | P01 | 1 | Threatened | Wherever found |
| Cycladenia humilis var. jonesii | Jones Cycladenia | Q1V7 | P01 | 6 | Threatened | Wherever found |
| Cyclargus ammon | Nickerbean Blue Butterfly | I0W6 | I01 | 4 | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Cyclargus (=Hemiargus) thomasi bethunebakeri | Miami Blue Butterfly | I02Q | I01 | 4 | Endangered | Wherever found |
| Cyclura carinata bartschi | Mayaguana iguana | C030 | V01 | Foreign | Threatened | Wherever found |
| Cyclura carinata carinata | Turks and Caicos iguana | C031 | V01 | Foreign | Threatened | Wherever found |
| Cyclura collei | Jamaican iguana | C02Z | V01 | Foreign | Endangered | Wherever found |
| Cyclura cychlura cychlura | Andros Island ground iguana | C02U | V01 | Foreign | Threatened | Wherever found |
| Cyclura cychlura figginsi | Exuma Island iguana | C02X | V01 | Foreign | Threatened | Wherever found |
| Cyclura cychlura inornata | Allen's Cay iguana | C02T | V01 | Foreign | Threatened | Wherever found |
| Cyclura lewisi | Grand Cayman ground iguana | C02Y | V01 | Foreign | Endangered | Wherever found |
| Cyclura nubila caymanensis | Cayman Brac ground iguana | C02V | V01 | Foreign | Threatened | Wherever found |
| Cyclura nubila nubila | Cuban ground iguana | C02W | V01 | Foreign | Threatened | Cuba (excludes U.S. Puerto Rico population) |
| Cyclura pinguis | Anegada ground iguana | C00C | V01 | Foreign | Endangered | Wherever found |
| Cyclura rileyi cristata | White Cay ground iguana | C033 | V01 | Foreign | Threatened | Wherever found |
| Cyclura rileyi nuchalis | Acklins ground iguana | C02S | V01 | Foreign | Threatened | Wherever found |
| Cyclura rileyi rileyi | Watling Island ground iguana | C032 | V01 | Foreign | Endangered | Wherever found |
| Cyclura stejnegeri | Mona ground Iguana | C01R | V01 | 4 | Threatened | Wherever found |
| Cynomys mexicanus | Mexican prairie dog | A022 | V01 | Foreign | Endangered | Mexico |
| Cynomys parvidens | Utah prairie dog | A04A | V01 | 6 | Threatened | Wherever found |
| Cynoscion macdonaldi | Totoaba (seatrout or weakfish) | E01W | V01 | Foreign | Endangered | Wherever found |
| Cyperus fauriei | No common name | Q35R | P01 | 1 | Endangered | Wherever found |
| Cyperus neokunthianus | No common name | Q35S | P01 | 1 | Endangered | Wherever found |
| Cyperus pennatiformis | No common name | Q2Q0 | P01 | 1 | Endangered | Wherever found |
| Cyperus trachysanthos | Pu`uka`a | Q321 | P01 | 1 | Endangered | Wherever found |
| Cyprinella caerulea | Blue shiner | E05Y | V01 | 4 | Threatened | Wherever found |
| Cyprinella formosa | Beautiful shiner | E04B | V01 | 2 | Threatened | Wherever found |
| Cyprinodon bovinus | Leon Springs pupfish | E023 | V01 | 2 | Endangered | Wherever found |
| Cyprinodon diabolis | Devils Hole pupfish | E009 | V01 | 8 | Endangered | Wherever found |
| Cyprinodon elegans | Comanche Springs pupfish | E008 | V01 | 2 | Endangered | Wherever found |
| Cyprinodon macularius | Desert pupfish | E044 | V01 | 2 | Endangered | Wherever found |
| Cyprinodon nevadensis mionectes | Ash Meadows Amargosa pupfish | E042 | V01 | 8 | Endangered | Wherever found |
| Cyprinodon nevadensis pectoralis | Warm Springs pupfish | E00W | V01 | 8 | Endangered | Wherever found |
| Cyprinodon radiosus | Owens pupfish | E00A | V01 | 8 | Endangered | Wherever found |
| Cyprogenia aberti | Western fanshell | F01L | I01 | 3 | Threatened | Wherever found |
| Cyprogenia sp. cf. aberti | Ouachita fanshell | F05B | I01 | 4 | Threatened | Entire |
| Cyprogenia stegaria | Fanshell | F02H | I01 | 4 | Endangered | Wherever found |
| Cyrtandra crenata | Ha`iwale | Q28B | P01 | 1 | Endangered | Wherever found |
| Cyrtandra cyaneoides | Mapele | Q322 | P01 | 1 | Endangered | Wherever found |
| Cyrtandra dentata | Ha`iwale | Q0JV | P01 | 1 | Endangered | Wherever found |
| Cyrtandra ferripilosa | haiwale | Q3NY | P01 | 1 | Endangered | Wherever found |
| Cyrtandra filipes | Ha`iwale | Q2SY | P01 | 1 | Endangered | Wherever found |
| Cyrtandra giffardii | Ha`iwale | Q28C | P01 | 1 | Endangered | Wherever found |
| Cyrtandra gracilis | Haiwale | Q28D | P01 | 1 | Endangered | Wherever found |
| Cyrtandra hematos | Ha`iwale | Q323 | P01 | 1 | Endangered | Wherever found |
| Cyrtandra kaulantha | Ha`iwale | Q0KJ | P01 | 1 | Endangered | Wherever found |
| Cyrtandra limahuliensis | Ha`iwale | Q326 | P01 | 1 | Threatened | Wherever found |
| Cyrtandra munroi | Ha`iwale | Q28I | P01 | 1 | Endangered | Wherever found |
| Cyrtandra nanawaleensis | haiwale | Q3OB | P01 | 1 | Endangered | Wherever found |
| Cyrtandra oenobarba | Ha`iwale | Q0KX | P01 | 1 | Endangered | Wherever found |
| Cyrtandra oxybapha | Ha`iwale | Q32A | P01 | 1 | Endangered | Wherever found |
| Cyrtandra paliku | Haiwale | Q3MU | P01 | 1 | Endangered | Wherever found |
| Cyrtandra polyantha | Ha`iwale | Q1V8 | P01 | 1 | Endangered | Wherever found |
| Cyrtandra sessilis | Ha`iwale | Q32B | P01 | 1 | Endangered | Wherever found |
| Cyrtandra subumbellata | Ha`iwale | Q1V9 | P01 | 1 | Endangered | Wherever found |
| Cyrtandra tintinnabula | Ha`iwale | Q32C | P01 | 1 | Endangered | Wherever found |
| Cyrtandra viridiflora | Ha`iwale | Q32D | P01 | 1 | Endangered | Wherever found |
| Cyrtandra wagneri | haiwale | Q3OC | P01 | 1 | Endangered | Wherever found |
| Cyrtandra waiolani | Haiwale | Q0LK | P01 | 1 | Endangered | Wherever found |
| Cyrtodactylus serpensinsula | Serpent Island gecko | C02R | V01 | Foreign | Threatened | Wherever found |
| Cyrtonaias tampicoensis tecomatensis | Tampico pearlymussel | F00Z | I01 | Foreign | Endangered | Wherever found |
| Cyrtonyx montezumae merriami | Merriam's Montezuma quail | B05K | V01 | Foreign | Endangered | Wherever found |
| Dalea carthagenensis floridana | Florida prairie-clover | Q3HL | P01 | 4 | Endangered | Entire |
| Dalea foliosa | Leafy prairie-clover | Q28M | P01 | 3 | Endangered | Entire |
| Damaliscus pygarus (=dorcas) dorcas | Bontebok | A04T | V01 | Foreign | Endangered | Wherever found |
| Dama mesopotamica (=dama m.) | Persian fallow deer | A00X | V01 | Foreign | Endangered | Wherever found |
| Daphnopsis helleriana | No common name | Q28N | P01 | 4 | Endangered | Wherever found |
| Dasyornis broadbenti littoralis | Western rufous bristlebird | B04Q | V01 | Foreign | Endangered | Wherever found |
| Dasyornis longirostris (=brachypterus I.) | Western bristlebird | B010 | V01 | Foreign | Endangered | Wherever found |
| Dasyurus viverrinus | Eastern native-cat | A049 | V01 | Foreign | Endangered | Wherever found |
| Daubentonia madagascariensis | Aye-aye | A00P | V01 | Foreign | Endangered | Wherever found |
| Deeringothamnus pulchellus | Beautiful pawpaw | Q28O | P01 | 4 | Endangered | Entire |
| Deeringothamnus rugelii | Rugel's pawpaw | Q28P | P01 | 4 | Endangered | Entire |
| Deinandra (=Hemizonia) conjugens | Otay tarplant | Q0YQ | P01 | 8 | Threatened | Wherever found |
| Deinandra increscens ssp. villosa | Gaviota Tarplant | Q340 | P01 | 8 | Endangered | Wherever found |
| Delissea rhytidosperma | No common name | Q1VA | P01 | 1 | Endangered | Wherever found |
| Delissea subcordata | Oha | Q1VB | P01 | 1 | Endangered | Wherever found |
| Delissea undulata | No common name | Q0LX | P01 | 1 | Endangered | Wherever found |
| Delphinapterus leucas | beluga whale | A0K5 | V01 | NMFS | Endangered | Cook Inlet DPS See 50 CFR 224.101 |
| Delphinium bakeri | Baker's larkspur | Q0LZ | P01 | 8 | Endangered | Wherever found |
| Delphinium luteum | Yellow larkspur | Q0M2 | P01 | 8 | Endangered | Wherever found |
| Deltistes luxatus | Lost River sucker | E052 | V01 | 8 | Endangered | Wherever found |
| Dendrobium guamense | No common name | Q3OV | P01 | 1 | Threatened | Wherever found |
| Dendrogyra cylindrus | Pillar Coral | P002 | I01 | NMFS | Threatened | Wherever found |
| Dendroica petechia petechia | Barbados yellow warbler (=wood) | B03H | V01 | Foreign | Endangered | Wherever found |
| Deparia kaalaana | No common name | S02L | P01 | 1 | Endangered | Wherever found |
| Dermatemys mawii | Central American river turtle | C04H | V01 | Foreign | Endangered | Wherever found |
| Dermochelys coriacea | Leatherback sea turtle | C00F | V01 | 4 | Endangered | Wherever found |
| Desmocerus californicus dimorphus | Valley elderberry longhorn beetle | I01L | I01 | 8 | Threatened | Wherever found |
| Dicerandra christmanii | Garrett's mint | Q2RL | P01 | 4 | Endangered | Entire |
| Dicerandra cornutissima | Longspurred mint | Q2OH | P01 | 4 | Endangered | Entire |
| Dicerandra frutescens | Scrub mint | Q1VE | P01 | 4 | Endangered | Entire |
| Dicerandra immaculata | Lakela's mint | Q1VF | P01 | 4 | Endangered | Entire |
| Dicerorhinus sumatrensis | Sumatran rhinoceros | A026 | V01 | Foreign | Endangered | Wherever found |
| Diceros bicornis | Black rhinoceros | A081 | V01 | Foreign | Endangered | Sub-Saharan Africa |
| Digitaria pauciflora | Florida pineland crabgrass | Q1VG | P01 | 4 | Threatened | Entire |
| Dinacoma caseyi | Casey's June Beetle | I0TG | I01 | 8 | Endangered | Wherever found |
| Diomedia amsterdamensis | Amsterdam Albatross | B09J | V01 | Foreign | Endangered | Wherever found |
| Dionda diaboli | Devils River minnow | E03V | V01 | 2 | Threatened | Wherever found |
| Diplacus vandenbergensis | Vandenberg monkeyflower | Q3NC | P01 | 8 | Endangered | Wherever found |
| Diplazium molokaiense | No common name | S00R | P01 | 1 | Endangered | Wherever found |
| Dipodomys heermanni morroensis | Morro Bay kangaroo rat | A03X | V01 | 8 | Endangered | Wherever found |
| Dipodomys ingens | Giant kangaroo rat | A08P | V01 | 8 | Endangered | Wherever found |
| Dipodomys merriami parvus | San Bernardino Merriam's kangaroo rat | A0G8 | V01 | 8 | Endangered | Wherever found |
| Dipodomys nitratoides exilis | Fresno kangaroo rat | A08O | V01 | 8 | Endangered | Wherever found |
| Dipodomys nitratoides nitratoides | Tipton kangaroo rat | A08S | V01 | 8 | Endangered | Wherever found |
| Dipodomys stephensi (incl. D. cascus) | Stephens' kangaroo rat | A08Q | V01 | 8 | Threatened | Wherever found |
| Discoglossus nigriventer | Israel painted frog | D002 | V01 | Foreign | Endangered | Wherever found |
| Discus macclintocki | Iowa Pleistocene snail | G00T | I01 | 3 | Endangered | Wherever found |
| Dodecahema leptoceras | Slender-horned spineflower | Q2T6 | P01 | 8 | Endangered | Wherever found |
| Donrichardsia macroneuron | South Llano Springs moss | U00K | P01 | 2 | Endangered | Wherever found |
| Doryopteris angelica | No common name | S02H | P01 | 1 | Endangered | Wherever found |
| Doryopteris takeuchii | No common name | S028 | P01 | 1 | Endangered | Wherever found |
| Dracaena fernaldii | Hala pepe | Q3HU | P01 | 1 | Endangered | Wherever found |
| Dracaena forbesii | Hala pepe | Q2GJ | P01 | 1 | Endangered | Wherever found |
| Dracaena konaensis | Hala pepe | Q37X | P01 | 1 | Endangered | Wherever found |
| Drepanis coccinea | `I`iwi | B0GU | V01 | 1 | Threatened | Wherever found |
| Drepanoptila holosericea | Cloven-feathered dove | B01B | V01 | Foreign | Endangered | Wherever found |
| Dromus dromas | Dromedary pearlymussel | F00K | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Drosophila aglaia | Hawaiian picture-wing fly | I0QW | I01 | 1 | Endangered | Wherever found |
| Drosophila differens | Hawaiian picture-wing fly | I0RE | I01 | 1 | Endangered | Wherever found |
| Drosophila digressa | Hawaiian picture-wing fly | I0QY | I01 | 1 | Endangered | Wherever found |
| Drosophila hemipeza | Hawaiian picture-wing fly | I0RC | I01 | 1 | Endangered | Wherever found |
| Drosophila heteroneura | Hawaiian picture-wing fly | I0QZ | I01 | 1 | Endangered | Wherever found |
| Drosophila montgomeryi | Hawaiian picture-wing fly | I0R0 | I01 | 1 | Endangered | Wherever found |
| Drosophila mulli | Hawaiian picture-wing fly | I0R1 | I01 | 1 | Threatened | Wherever found |
| Drosophila musaphilia | Hawaiian picture-wing fly | I0R2 | I01 | 1 | Endangered | Wherever found |
| Drosophila neoclavisetae | Hawaiian picture-wing fly | I0R3 | I01 | 1 | Endangered | Wherever found |
| Drosophila obatai | Hawaiian picture-wing fly | I0R4 | I01 | 1 | Endangered | Wherever found |
| Drosophila ochrobasis | Hawaiian picture-wing fly | I0RD | I01 | 1 | Endangered | Wherever found |
| Drosophila sharpi | Hawaiian picture-wing fly | I0QX | I01 | 1 | Endangered | Wherever found |
| Drosophila substenoptera | Hawaiian picture-wing fly | I0R5 | I01 | 1 | Endangered | Wherever found |
| Drosophila tarphytrichia | Hawaiian picture-wing fly | I0R6 | I01 | 1 | Endangered | Wherever found |
| Drymarchon couperi | Eastern indigo snake | C026 | V01 | 4 | Threatened | Wherever found |
| Dryocopus javensis richardsi | Tristam's woodpecker | B03R | V01 | Foreign | Endangered | Wherever found |
| Dryopteris crinalis var. podosorus | Palapalai aumakua | S02I | P01 | 1 | Endangered | Wherever found |
| Dryopteris glabra var. pusilla | Hohiu | S029 | P01 | 1 | Endangered | Wherever found |
| Dubautia herbstobatae | Na`ena`e | Q2T8 | P01 | 1 | Endangered | Wherever found |
| Dubautia imbricata ssp. imbricata | Na`ena`e | Q32N | P01 | 1 | Endangered | Wherever found |
| Dubautia kalalauensis | Naenae | Q3MV | P01 | 1 | Endangered | Wherever found |
| Dubautia kenwoodii | Naenae | Q3MW | P01 | 1 | Endangered | Wherever found |
| Dubautia latifolia | Koholapehu | Q1VK | P01 | 1 | Endangered | Wherever found |
| Dubautia pauciflorula | Na`ena`e | Q32P | P01 | 1 | Endangered | Wherever found |
| Dubautia plantaginea ssp. humilis | Na`ena`e | Q32Q | P01 | 1 | Endangered | Wherever found |
| Dubautia plantaginea ssp. magnifolia | Na`ena`e | Q3H3 | P01 | 1 | Endangered | Wherever found |
| Dubautia waialealae | Na`ena`e | Q0O6 | P01 | 1 | Endangered | Wherever found |
| Ducula galeata | Marquesas pigeon | B0CT | V01 | Foreign | Endangered | Wherever found |
| Ducula mindorensis | Mindoro imperial (=zone-tailed) pigeon | B05H | V01 | Foreign | Endangered | Wherever found |
| Dudleya abramsii ssp. parva | Conejo dudleya | Q0O7 | P01 | 8 | Threatened | Wherever found |
| Dudleya cymosa ssp. marcescens | Marcescent dudleya | Q0OC | P01 | 8 | Threatened | Wherever found |
| Dudleya cymosa ssp. ovatifolia | Santa Monica Mountains dudleyea | Q3AK | P01 | 8 | Threatened | Wherever found |
| Dudleya setchellii | Santa Clara Valley dudleya | Q32V | P01 | 8 | Endangered | Wherever found |
| Dudleya stolonifera | Laguna Beach liveforever | Q0OH | P01 | 8 | Threatened | Wherever found |
| Dudleya traskiae | Santa Barbara Island liveforever | Q1VT | P01 | 8 | Endangered | Wherever found |
| Dudleya verityi | Verity's dudleya | Q2OM | P01 | 8 | Threatened | Wherever found |
| Dugong dugon | Dugong | A033 | V02 | Foreign | Endangered | Wherever found |
| Echinacea laevigata | Smooth coneflower | Q293 | P01 | 4 | Threatened | Wherever found |
| Echinocactus horizonthalonius var. nicholii | Nichol's Turk's head cactus | Q1VV | P01 | 2 | Endangered | Wherever found |
| Echinocereus arizonicus ssp. arizonicus | Arizona hedgehog cactus | Q1VZ | P01 | 2 | Endangered | Wherever found |
| Echinocereus chisoensis var. chisoensis | Chisos Mountain hedgehog Cactus | Q294 | P01 | 2 | Threatened | Wherever found |
| Echinocereus fendleri var. kuenzleri | Kuenzler hedgehog cactus | Q1VW | P01 | 2 | Threatened | Wherever found |
| Echinocereus reichenbachii var. albertii | Black lace cactus | Q1VY | P01 | 2 | Endangered | Wherever found |
| Echinocereus viridiflorus var. davisii | Davis' green pitaya | Q1W0 | P01 | 2 | Endangered | Wherever found |
| Echinomastus erectocentrus var. acunensis | Acuña Cactus | Q0OU | P01 | 2 | Endangered | Wherever found |
| Egretta eulophotes | Chinese egret | B01G | V01 | Foreign | Endangered | Wherever found |
| Elaphoglossum serpens | No common name | S01U | P01 | 4 | Endangered | Wherever found |
| Elaphrus viridis | Delta green ground beetle | I01G | I01 | 8 | Threatened | Wherever found |
| Elassoma alabamae | Spring pygmy sunfish | E05B | V01 | 4 | Threatened | Wherever found |
| Elephas maximus | Asian elephant | A059 | V01 | Foreign | Endangered | Wherever found |
| Eleutherodactylus cooki | Guajon | D00X | V01 | 4 | Threatened | Wherever found |
| Eleutherodactylus jasperi | Golden coqui | D00D | V01 | 4 | Threatened | Wherever found |
| Eleutherodactylus juanariveroi | Llanero Coqui | D03V | V01 | 4 | Endangered | Wherever found |
| Elimia crenatella | Lacy elimia (snail) | G063 | I01 | 4 | Threatened | Wherever found |
| Ellipsoptera puritana | Puritan tiger beetle | I02D | I01 | 5 | Threatened | Wherever found |
| Elliptio chipolaensis | Chipola slabshell | F03O | I01 | 4 | Threatened | Wherever found |
| Elliptio lanceolata | Yellow lance | F03I | I01 | 4 | Threatened | Wherever found |
| Elliptio spinosa | Altamaha Spinymussel | F026 | I01 | 4 | Endangered | Wherever found |
| Elliptoideus sloatianus | Purple bankclimber (mussel) | F02E | I01 | 4 | Threatened | Wherever found |
| Emballonura semicaudata rotensis | Pacific sheath-tailed Bat | A0I9 | V01 | 1 | Endangered | Wherever found |
| Emballonura semicaudata semicaudata | Pacific sheath-tailed Bat | A0FO | V01 | 1 | Endangered | American Samoa |
| Emoia slevini | Slevin's skink | C07T | V01 | 1 | Endangered | Wherever found |
| Empetrichthys latos | Pahrump poolfish | E007 | V01 | 8 | Endangered | Wherever found |
| Empidonax euleri johnstonei | Euler's flycatcher | B01J | V01 | Foreign | Endangered | Wherever found |
| Empidonax traillii extimus | Southwestern willow flycatcher | B094 | V01 | 2 | Endangered | Wherever found |
| Enceliopsis nudicaulis var. corrugata | Ash Meadows sunray | Q297 | P01 | 8 | Threatened | Wherever found |
| Enhydra lutris kenyoni | Northern Sea Otter | A0HK | V01 | 7 | Threatened | Southwest Alaska, from Attu Island to Western Cook Inlet, including Bristol Bay, the Kodiak Archipelago, and the Barren Islands |
| Enhydra lutris nereis | Southern sea otter | A0A7 | V01 | 8 | Threatened | Wherever found |
| Epicrates monensis monensis | Mona boa | C01Q | V01 | 4 | Threatened | Wherever found |
| Epicrates subflavus | Jamaican boa | C003 | V01 | Foreign | Endangered | Wherever found |
| Epinephelus striatus | Nassau grouper | E0DA | V01 | NMFS | Threatened | Entire |
| Epioblasma brevidens | Cumberlandian combshell | F01F | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Epioblasma capsaeformis | Oyster mussel | F01T | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Epioblasma florentina curtisii | Curtis pearlymussel | F00J | I01 | 3 | Endangered | Wherever found |
| Epioblasma florentina walkeri (=E. walkeri) | Tan riffleshell | F010 | I01 | 4 | Endangered | Wherever found |
| Epioblasma obliquata | Purple Cat's paw (=Purple Cat's paw pearlymussel) | F006 | I01 | 3 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Epioblasma penita | Southern combshell | F012 | I01 | 4 | Endangered | Wherever found |
| Epioblasma perobliqua | White catspaw (pearlymussel) | F007 | I01 | 3 | Endangered | Wherever found |
| Epioblasma rangiana | Northern riffleshell | F02Z | I01 | 5 | Endangered | Wherever found |
| Epioblasma triquetra | Snuffbox mussel | F03J | I01 | 3 | Endangered | Wherever found |
| Equus africanus | African wild ass | A00M | V01 | Foreign | Endangered | Wherever found |
| Equus grevyi | Grevy's zebra | A077 | V01 | Foreign | Threatened | Wherever found |
| Equus hemionus | Asian wild ass | A00N | V01 | Foreign | Endangered | Wherever found |
| Equus przewalskii | Przewalski's horse | A05E | V01 | Foreign | Endangered | Wherever found |
| Equus zebra hartmannae | Hartmann's mountain zebra | A078 | V01 | Foreign | Threatened | Wherever found |
| Equus zebra ssp. zebra | Cape Mountain zebra | A0LA | V01 | Foreign | Endangered | Entire |
| Equus zebra zebra | Mountain zebra | A06A | V01 | Foreign | Endangered | Wherever found |
| Eragrostis fosbergii | Fosberg's love grass | Q0PH | P01 | 1 | Endangered | Wherever found |
| Eremalche kernensis | Kern mallow | Q2TD | P01 | 8 | Endangered | Wherever found |
| Eremichthys acros | Desert dace | E03C | V01 | 8 | Threatened | Wherever found |
| Eremophila alpestris strigata | Streaked Horned lark | B0B3 | V01 | 1 | Threatened | Wherever found |
| Eretmochelys imbricata | Hawksbill sea turtle | C00E | V01 | 4 | Endangered | Wherever found |
| Eriastrum densifolium ssp. sanctorum | Santa Ana River woolly-star | Q29A | P01 | 8 | Endangered | Wherever found |
| Erigeron decumbens | Willamette daisy | Q2TF | P01 | 1 | Endangered | Wherever found |
| Erigeron parishii | Parish's daisy | Q29D | P01 | 8 | Threatened | Wherever found |
| Erigeron rhizomatus | Zuni fleabane | Q1W4 | P01 | 2 | Threatened | Wherever found |
| Erignathus barbatus nauticus | bearded Seal | A0KM | V02 | NMFS | Threatened | Beringia DPS - See 50 CFR 223.102 |
| Erignathus barbatus nauticus | bearded Seal | A0KM | V03 | NMFS | Threatened | Okhotsk DPS - See 50 CFR 223.102 |
| Erimonax monachus | Spotfin Chub | E012 | V01 | 4 | Threatened | Wherever found, except where listed as an experimental population |
| Erimystax cahni | Slender chub | E01X | V01 | 4 | Threatened | Wherever found |
| Erinna newcombi | Newcomb's snail | G0C0 | I01 | 1 | Threatened | Wherever found |
| Eriocnemis nigrivestis | black-breasted puffleg | B0GF | V01 | Foreign | Endangered | Wherever found |
| Eriodictyon altissimum | Indian Knob mountainbalm | Q1W5 | P01 | 8 | Endangered | Wherever found |
| Eriodictyon capitatum | Lompoc yerba santa | Q0QR | P01 | 8 | Endangered | Wherever found |
| Eriogonum apricum (incl. var. prostratum) | Ione (incl. Irish Hill) buckwheat | Q0QW | P01 | 8 | Endangered | Wherever found |
| Eriogonum codium | Umtanum desert buckwheat | Q3HN | P01 | 1 | Threatened | Wherever found |
| Eriogonum gypsophilum | Gypsum wild-buckwheat | Q1W7 | P01 | 2 | Threatened | Wherever found |
| Eriogonum kennedyi var. austromontanum | Southern mountain wild-buckwheat | Q0S7 | P01 | 8 | Threatened | Wherever found |
| Eriogonum longifolium var. gnaphalifolium | Scrub buckwheat | Q29N | P01 | 4 | Threatened | Entire |
| Eriogonum ovalifolium var. vineum | Cushenbury buckwheat | Q1W8 | P01 | 8 | Endangered | Wherever found |
| Eriogonum ovalifolium var. williamsiae | Steamboat buckwheat | Q2OR | P01 | 8 | Endangered | Wherever found |
| Eriogonum pelinophilum | Clay-Loving wild buckwheat | Q29P | P01 | 6 | Endangered | Wherever found |
| Eriogonum tiehmii | Tiehm's buckwheat | Q33B | P01 | 8 | Endangered | Entire |
| Eriophyllum latilobum | San Mateo woolly sunflower | Q2TK | P01 | 8 | Endangered | Wherever found |
| Eryngium aristulatum var. parishii | San Diego button-celery | Q1W9 | P01 | 8 | Endangered | Wherever found |
| Eryngium constancei | Loch Lomond coyote thistle | Q29S | P01 | 8 | Endangered | Wherever found |
| Eryngium cuneifolium | Snakeroot | Q29T | P01 | 4 | Endangered | Entire |
| Eryngium sparganophyllum | Arizona eryngo | Q3ST | P01 | 2 | Endangered | Entire |
| Erysimum capitatum var. angustatum | Contra Costa wallflower | Q1WA | P01 | 8 | Endangered | Wherever found |
| Erysimum menziesii | Menzies' wallflower | Q29W | P01 | 8 | Endangered | Wherever found |
| Erysimum teretifolium | Ben Lomond wallflower | Q29X | P01 | 8 | Endangered | Wherever found |
| Erythronium propullans | Minnesota dwarf trout lily | Q2A1 | P01 | 3 | Endangered | Wherever found |
| Eschrichtius robustus | Gray whale | A02P | V01 | NMFS | Endangered | Western North Pacific DPS See 50 CFR 224.101 |
| Escobaria minima | Nellie''s cory cactus | Q1UU | P01 | 2 | Endangered | Wherever found |
| Etheostoma akatulo | bluemask darter | E076 | V01 | 4 | Endangered | Wherever found |
| Etheostoma boschungi | Slackwater darter | E01B | V01 | 4 | Threatened | Wherever found |
| Etheostoma chermocki | Vermilion darter | E098 | V01 | 4 | Endangered | Wherever found |
| Etheostoma chienense | Relict darter | E086 | V01 | 4 | Threatened | Wherever found |
| Etheostoma etowahae | Etowah darter | E089 | V01 | 4 | Endangered | Wherever found |
| Etheostoma fonticola | Fountain darter | E00T | V01 | 2 | Endangered | Wherever found |
| Etheostoma moorei | Yellowcheek Darter | E01E | V01 | 4 | Endangered | Wherever found |
| Etheostoma nianguae | Niangua darter | E02B | V01 | 3 | Threatened | Wherever found |
| Etheostoma nuchale | Watercress darter | E00U | V01 | 4 | Endangered | Wherever found |
| Etheostoma osburni | Candy darter | E03K | V01 | 5 | Endangered | Wherever found |
| Etheostoma percnurum | Duskytail darter | E078 | V01 | 4 | Endangered | Wherever found |
| Etheostoma phytophilum | Rush Darter | E0AB | V01 | 4 | Endangered | Wherever found |
| Etheostoma rubrum | Bayou darter | E01S | V01 | 4 | Threatened | Wherever found |
| Etheostoma scotti | Cherokee darter | E03J | V01 | 4 | Threatened | Wherever found |
| Etheostoma sellare | Maryland darter | E003 | V01 | 5 | Endangered | Wherever found |
| Etheostoma spilotum | Kentucky arrow darter | E0BF | V01 | 4 | Threatened | Wherever found |
| Etheostoma susanae | Cumberland darter | E05R | V01 | 4 | Endangered | Wherever found |
| Etheostoma trisella | Trispot darter | E05G | V01 | 4 | Threatened | Wherever found |
| Etheostoma wapiti | Boulder darter | E05P | V01 | 4 | Endangered | Wherever found |
| Eua zebrina | Snail [no common name] | G0BJ | I01 | 1 | Endangered | Wherever found |
| Eubalaena australis | Southern Right Whale | A0K7 | V01 | NMFS | Endangered | Wherever found |
| Eubalaena glacialis | North Atlantic Right Whale | A02R | V01 | NMFS | Endangered | Wherever found |
| Eubalaena japonica | North Pacific Right Whale | A0K6 | V01 | NMFS | Endangered | Wherever found |
| Euchloe ausonides insulanus | Island marble Butterfly | I0T7 | I01 | 1 | Endangered | Wherever found |
| Eucyclogobius newberryi | Tidewater goby | E071 | V01 | 8 | Endangered | Wherever found |
| Eudyptes chrysocome | southern rockhopper penguin | B0FC | V01 | Foreign | Threatened | New Zealand-Australia DPS, associated with the Campbell Plateau and Macquarie Island |
| Eudyptes pachyrhynchus | fiordland crested penguin | B0FF | V01 | Foreign | Threatened | Wherever found |
| Eudyptes sclateri | erect-crested penguin | B0FH | V01 | Foreign | Threatened | Wherever found |
| Eudyptula albosignata | white-flippered penguin | B0FK | V01 | Foreign | Threatened | Wherever found |
| Eugenia bryanii | No common name | Q3OW | P01 | 1 | Endangered | Wherever found |
| Eugenia haematocarpa | Uvillo | Q2A2 | P01 | 4 | Endangered | Wherever found |
| Eugenia koolauensis | Nioi | Q33F | P01 | 1 | Endangered | Wherever found |
| Eugenia woodburyana | No common name | Q3D7 | P01 | 4 | Threatened | Wherever found |
| Eulidia yarrellii | Chilean woodstar | B0CY | V01 | Foreign | Endangered | Wherever found |
| Eumeces egregius lividus | blue-tailed mole skink | C03T | V01 | 4 | Threatened | Wherever found |
| Eumetopias jubatus | Steller sea lion | A0FS | V02 | NMFS | Endangered | Western DPS - See 50 CFR 224.101 |
| Eumops floridanus | Florida bonneted bat | A0JB | V01 | 4 | Endangered | Wherever found |
| Euphilotes battoides allyni | El Segundo blue butterfly | I00C | I01 | 8 | Endangered | Wherever found |
| Euphilotes enoptes smithi | Smith's blue butterfly | I00R | I01 | 8 | Endangered | Wherever found |
| Euphorbia celastroides var. kaenana | `Akoko | Q1U7 | P01 | 1 | Endangered | Wherever found |
| Euphorbia deppeana | `Akoko | Q1U8 | P01 | 1 | Endangered | Wherever found |
| Euphorbia eleanoriae | `Akoko | Q3HH | P01 | 1 | Endangered | Wherever found |
| Euphorbia haeleeleana | `Akoko | Q0UD | P01 | 1 | Endangered | Wherever found |
| Euphorbia halemanui | 'Akoko | Q1UA | P01 | 1 | Endangered | Wherever found |
| Euphorbia herbstii | `Akoko | Q3GN | P01 | 1 | Endangered | Wherever found |
| Euphorbia kuwaleana | `Akoko | Q30T | P01 | 1 | Endangered | Wherever found |
| Euphorbia remyi var. kauaiensis | `Akoko | Q1UC | P01 | 1 | Endangered | Wherever found |
| Euphorbia remyi var. remyi | `Akoko | Q1UD | P01 | 1 | Endangered | Wherever found |
| Euphorbia rockii | `Akoko | Q3GO | P01 | 1 | Endangered | Wherever found |
| Euphorbia skottsbergii var. skottsbergii | `Akoko | Q1UE | P01 | 1 | Endangered | Wherever found |
| Euphorbia telephioides | Telephus spurge | Q2A5 | P01 | 4 | Threatened | Entire |
| Euphydryas anicia cloudcrofti | Sacramento Mountains checkerspot Butterfly | I0RK | I01 | 2 | Endangered | Wherever found |
| Euphydryas editha bayensis | Bay checkerspot butterfly | I021 | I01 | 8 | Threatened | Wherever found |
| Euphydryas editha quino (=E. e. wrighti) | Quino checkerspot butterfly | I00P | I01 | 8 | Endangered | Wherever found |
| Euphydryas editha taylori | Taylor's (=whulge) Checkerspot | I0T6 | I01 | 1 | Endangered | Wherever found |
| Euphyllia paradivisa | No common name | P00F | I01 | NMFS | Threatened | Wherever found |
| Euproserpinus euterpe | Kern primrose sphinx moth | I01C | I01 | 8 | Threatened | Wherever found |
| Eurycea chisholmensis | Salado Salamander | D02X | V01 | 2 | Threatened | Wherever found |
| Eurycea nana | San Marcos salamander | D00I | V01 | 2 | Threatened | Wherever found |
| Eurycea naufragia | Georgetown Salamander | D02S | V01 | 2 | Threatened | Wherever found |
| Eurycea rathbuni | Texas blind salamander | D001 | V01 | 2 | Endangered | Wherever found |
| Eurycea sosorum | Barton Springs salamander | D010 | V01 | 2 | Endangered | Wherever found |
| Eurycea tonkawae | Jollyville Plateau Salamander | D02T | V01 | 2 | Threatened | Wherever found |
| Eurycea waterlooensis | Austin blind Salamander | D033 | V01 | 2 | Endangered | Wherever found |
| Eutrema penlandii | Penland alpine fen mustard | Q1WG | P01 | 6 | Threatened | Entire |
| Eutrichomyias rowleyi | Caerulean Paradise flycatcher | B0B9 | V01 | Foreign | Endangered | Wherever found |
| Eutriorchis astur | Madagascar serpent eagle | B09M | V01 | Foreign | Endangered | Wherever found |
| Exocarpos luteolus | Heau | Q2A6 | P01 | 1 | Endangered | Wherever found |
| Exocarpos menziesii | Heau | Q3OJ | P01 | 1 | Endangered | Entire |
| Falco araea | Seychelles kestrel | B01Y | V01 | Foreign | Endangered | Wherever found |
| Falco femoralis septentrionalis | Northern Aplomado Falcon | B06V | V01 | 2 | Endangered | Wherever found, except where listed as an experimental population |
| Falco peregrinus peregrinus | Eurasian peregrine falcon | B050 | V01 | Foreign | Endangered | Wherever found |
| Falco punctatus | Mauritius kestrel | B01X | V01 | Foreign | Endangered | Wherever found |
| Faxonius peruncus | Big Creek Crayfish | K090 | I01 | 3 | Threatened | Entire |
| Faxonius quadruncus | St. Francis River Crayfish | K091 | I01 | 3 | Threatened | Entire |
| Felis jacobita | Andean cat | A04V | V01 | Foreign | Endangered | Wherever found |
| Felis margarita scheffeli | Pakistan sand cat | A0A0 | V01 | Foreign | Endangered | Wherever found |
| Felis nigripes | Black-footed cat | A04W | V01 | Foreign | Endangered | Wherever found |
| Felis pardina | Spanish lynx | A01M | V01 | Foreign | Endangered | Wherever found |
| Festuca hawaiiensis | No common name | Q33I | P01 | 1 | Endangered | Wherever found |
| Festuca ligulata | Guadalupe fescue | Q0UM | P01 | 2 | Endangered | Wherever found |
| Festuca molokaiensis | No common name | Q3O5 | P01 | 1 | Endangered | Wherever found |
| Fitzroya cupressoides | Chilean false larch | R004 | P01 | Foreign | Threatened | Wherever found |
| Flueggea neowawraea | Mehamehame | Q33K | P01 | 1 | Endangered | Wherever found |
| Formicivora erythronotos | Black hooded (black-headed) antwren | B0D2 | V01 | Foreign | Endangered | Wherever found |
| Foudia flavicans | Rodrigues fody | B09P | V01 | Foreign | Endangered | Wherever found |
| Foudia rubra | Mauritius fody | B09O | V01 | Foreign | Endangered | Wherever found |
| Foudia sechellarum | Seychelles fody (weaver-finch) | B01M | V01 | Foreign | Endangered | Wherever found |
| Francolinus ochropectus | Djibouti francolin | B09Q | V01 | Foreign | Endangered | Wherever found |
| Fregata andrewsi | Andrew's frigatebird | B051 | V01 | Foreign | Endangered | Wherever found |
| Fremontodendron californicum ssp. decumbens | Pine Hill flannelbush | Q0V1 | P01 | 8 | Endangered | Wherever found |
| Fremontodendron mexicanum | Mexican flannelbush | Q2OZ | P01 | 8 | Endangered | Wherever found |
| Fritillaria gentneri | Gentner's Fritillary | Q0V6 | P01 | 1 | Endangered | Wherever found |
| Fulica alai | Hawaiian coot (alae ke`oke`o) | B04G | V01 | 1 | Endangered | Wherever found |
| Fundulus julisia | Barrens topminnow | E05C | V01 | 4 | Endangered | Wherever found |
| Fusconaia burkei | Tapered pigtoe | F03W | I01 | 4 | Threatened | Wherever found |
| Fusconaia cor | Shiny pigtoe | F00Q | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Fusconaia cuneolus | Finerayed pigtoe | F00O | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Fusconaia escambia | Narrow pigtoe | F02T | I01 | 4 | Threatened | Wherever found |
| Fusconaia masoni | Atlantic pigtoe | F03K | I01 | 4 | Threatened | Wherever found |
| Fusconaia subrotunda | Longsolid | F04V | I01 | 4 | Threatened | Wherever found |
| Galactia smallii | Small's milkpea | Q2RJ | P01 | 4 | Endangered | Entire |
| Galium californicum ssp. sierrae | El Dorado bedstraw | Q0VG | P01 | 8 | Endangered | Wherever found |
| Gallicolumba stairi | Friendly Ground-Dove | B0AJ | V01 | 1 | Endangered | American Samoa DPS |
| Gallinula chloropus guami | Mariana common moorhen (pulattat) | B062 | V01 | 1 | Endangered | Wherever found |
| Gallinula galeata sandvicensis | Hawaiian common gallinule | B00H | V01 | 1 | Endangered | Wherever found |
| Gallirallus owstoni | Guam rail | B063 | V01 | 1 | Endangered | Wherever found, except where listed as an experimental population |
| Gallirallus (=Tricholimnas) sylvestris | Lord Howe wood rail | B05M | V01 | Foreign | Endangered | Wherever found |
| Gallotia simonyi simonyi | Hierro giant lizard | C034 | V01 | Foreign | Endangered | Wherever found |
| Gambelia silus | Blunt-nosed leopard lizard | C001 | V01 | 8 | Endangered | Wherever found |
| Gambusia gaigei | Big Bend gambusia | E004 | V01 | 2 | Endangered | Wherever found |
| Gambusia heterochir | Clear Creek gambusia | E005 | V01 | 2 | Endangered | Wherever found |
| Gambusia nobilis | Pecos gambusia | E00V | V01 | 2 | Endangered | Wherever found |
| Gammarus acherondytes | Illinois cave amphipod | K021 | I01 | 3 | Endangered | Wherever found |
| Gammarus desperatus | Noel's Amphipod | K023 | I01 | 2 | Endangered | Wherever found |
| Gammarus hyalleloides | Diminutive Amphipod | K020 | I01 | 2 | Endangered | Wherever found |
| Gammarus pecos | Pecos amphipod | K024 | I01 | 2 | Endangered | Wherever found |
| Gardenia brighamii | Hawaiian gardenia | Q1WJ | P01 | 1 | Endangered | Wherever found |
| Gardenia mannii | Nanu | Q3GR | P01 | 1 | Endangered | Wherever found |
| Gardenia remyi | Nanu | Q33N | P01 | 1 | Endangered | Wherever found |
| Gasterosteus aculeatus williamsoni | Unarmored threespine stickleback | E00X | V01 | 8 | Endangered | Wherever found |
| Gavialis gangeticus | Gavial | C009 | V01 | Foreign | Endangered | Wherever found |
| Gazella cuvieri | Mountain (=Cuvier's) gazelle | A012 | V01 | Foreign | Endangered | Wherever found |
| Gazella dama | Dama gazelle | A0G4 | V01 | Foreign | Endangered | Wherever found |
| Gazella dama lozanoi | Rio de Oro Dama gazelle | A015 | V01 | Foreign | Endangered | Wherever found |
| Gazella dama mhorr | Mhorr gazelle | A013 | V01 | Foreign | Endangered | Wherever found |
| Gazella dorcas massaesyla | Moroccan gazelle | A014 | V01 | Foreign | Endangered | Wherever found |
| Gazella dorcas pelzelni | Pelzeln's gazelle | A07M | V01 | Foreign | Endangered | Wherever found |
| Gazella dorcas saudiya | Saudi Arabian gazelle | A07O | V01 | Foreign | Endangered | Wherever found |
| Gazella gazella | Arabian gazelle | A07L | V01 | Foreign | Endangered | Wherever found |
| Gazella leptoceros | Slender-horned gazelle | A016 | V01 | Foreign | Endangered | Wherever found |
| Gazella subgutturosa marica | Sand gazelle | A07N | V01 | Foreign | Endangered | Wherever found |
| Geocarpon minimum | No common name | Q1WK | P01 | 4 | Threatened | Wherever found |
| Geochelone nigra (=elephantopus) | Galapagos tortoise | C00I | V01 | Foreign | Endangered | Wherever found |
| Geochelone radiata | Madagascar radiated tortoise | C00J | V01 | Foreign | Endangered | Wherever found |
| Geochelone yniphora | Angulated tortoise | C01C | V01 | Foreign | Endangered | Wherever found |
| Geoclemys hamiltonii | Spotted pond turtle | C01K | V01 | Foreign | Endangered | Wherever found |
| Geopsittacus occidentalis | Night (=Australian) parrot | B02H | V01 | Foreign | Endangered | Wherever found |
| Geranium arboreum | Nohoanu | Q1WL | P01 | 1 | Endangered | Wherever found |
| Geranium hanaense | Nohoanu | Q3HM | P01 | 1 | Endangered | Wherever found |
| Geranium hillebrandii | Nohoanu | Q3DB | P01 | 1 | Endangered | Wherever found |
| Geranium kauaiense | Nohoanu | Q33O | P01 | 1 | Endangered | Wherever found |
| Geranium multiflorum | Nohoanu | Q2AI | P01 | 1 | Endangered | Wherever found |
| Geronticus eremita | Northern bald ibis | B06B | V01 | Foreign | Endangered | Wherever found |
| Gesneria pauciflora | No common name | Q2TT | P01 | 4 | Threatened | Wherever found |
| Geum radiatum | Spreading avens | Q1WM | P01 | 4 | Endangered | Wherever found |
| Gila bicolor ssp. | Hutton tui chub | E02S | V01 | 1 | Threatened | Wherever found |
| Gila bicolor ssp. mohavensis | Mohave tui chub | E00Q | V01 | 8 | Endangered | Wherever found |
| Gila bicolor ssp. snyderi | Owens Tui Chub | E02W | V01 | 8 | Endangered | Wherever found |
| Gila cypha | Humpback chub | E000 | V01 | 6 | Threatened | Wherever found |
| Gila ditaenia | Sonora chub | E029 | V01 | 2 | Threatened | Wherever found |
| Gila elegans | Bonytail | E020 | V01 | 6 | Endangered | Wherever found |
| Gila intermedia | Gila chub | E02P | V01 | 2 | Endangered | Wherever found |
| Gila nigrescens | Chihuahua chub | E028 | V01 | 2 | Threatened | Wherever found |
| Gila purpurea | Yaqui chub | E034 | V01 | 2 | Endangered | Wherever found |
| Gila robusta jordani | Pahranagat roundtail chub | E00R | V01 | 8 | Endangered | Wherever found |
| Gila seminuda (=robusta) | Virgin River Chub | E02A | V01 | 6 | Endangered | Wherever found |
| Gilia tenuiflora ssp. arenaria | Monterey gilia | Q2AJ | P01 | 8 | Endangered | Wherever found |
| Gilia tenuiflora ssp. hoffmannii | Hoffmann's slender-flowered gilia | Q0WC | P01 | 8 | Endangered | Wherever found |
| Glaucidium brasilianum cactorum | Cactus ferruginous pygmy-owl | B08N | V03 | 2 | Threatened | Wherever found |
| Glaucomys sabrinus coloratus | Carolina northern flying squirrel | A09M | V01 | 4 | Endangered | Wherever found |
| Glaucopsyche lygdamus palosverdesensis | Palos Verdes blue butterfly | I01B | I01 | 8 | Endangered | Wherever found |
| Glyptemys muhlenbergii | bog turtle | C048 | V01 | 5 | Threatened | Wherever found, except GA, NC, SC, TN, VA |
| Glyptemys muhlenbergii | bog turtle | C048 | V02 | 4 | Similarity of Appearance to a Threatened Taxon | U.S.A. (GA, NC, SC, TN, VA) |
| Goetzea elegans | Beautiful goetzea | Q2AL | P01 | 4 | Endangered | Wherever found |
| Gonocalyx concolor | No common name | Q2TV | P01 | 4 | Endangered | Wherever found |
| Gopherus agassizii | Desert tortoise | C04L | V02 | 8 | Similarity of Appearance to a Threatened Taxon | AZ south and east of Colorado R., and Mexico, when found outside of Mexico or said range in AZ |
| Gopherus agassizii | Desert tortoise | C04L | V05 | 8 | Threatened | Wherever found, except AZ south and east of Colorado R., and Mexico |
| Gopherus flavomarginatus | Bolson tortoise | C02H | V01 | 2 | Endangered | Wherever found |
| Gopherus polyphemus | Gopher tortoise | C044 | V01 | 4 | Threatened | Western DPS |
| Gorilla gorilla | Gorilla | A017 | V01 | Foreign | Endangered | Wherever found |
| Gouania hillebrandii | No common name | Q1WP | P01 | 1 | Endangered | Wherever found |
| Gouania meyenii | No common name | Q1WQ | P01 | 1 | Endangered | Wherever found |
| Gouania vitifolia | No common name | Q1WR | P01 | 1 | Endangered | Wherever found |
| Grallaria milleri | Brown-banded antpitta | B0BK | V01 | Foreign | Endangered | Wherever found |
| Graptemys flavimaculata | Yellow-blotched map turtle | C025 | V01 | 4 | Threatened | Wherever found |
| Graptemys oculifera | Ringed map turtle | C022 | V01 | 4 | Threatened | Wherever found |
| Graptopetalum bartramii | Bartram's stonecrop | Q0WW | P01 | 2 | Threatened | Wherever found |
| Grindelia fraxinipratensis | Ash Meadows gumplant | Q2AM | P01 | 8 | Threatened | Wherever found |
| Grus americana | Whooping crane | B003 | V01 | 2 | Endangered | Wherever found, except where listed as an experimental population |
| Grus canadensis nesiotes | Cuba sandhill crane | B05U | V01 | Foreign | Endangered | Wherever found |
| Grus japonensis | Japanese Crane | B016 | V01 | Foreign | Endangered | Wherever found |
| Grus leucogeranus | Siberian white Crane | B03Z | V01 | Foreign | Endangered | Wherever found |
| Grus monacha | Hooded Crane | B04U | V01 | Foreign | Endangered | Wherever found |
| Grus nigricollis | Black-necked Crane | B04T | V01 | Foreign | Endangered | Wherever found |
| Grus vipio | White-naped Crane | B04V | V01 | Foreign | Endangered | Wherever found |
| Gulo gulo luscus | North American wolverine | A0FA | V01 | 6 | Threatened | Wherever found |
| Gymnobelideus leadbeateri | Leadbeater's Possum | A0FM | V01 | Foreign | Endangered | Wherever found |
| Gymnoderma lineare | Rock gnome lichen | U001 | P01 | 4 | Endangered | Wherever found |
| Gymnogyps californianus | California condor | B002 | V01 | 8 | Endangered | U.S.A. only, except where listed as an experimental population |
| Gymnomyza samoensis | Mao (= maomao) (honeyeater) | B0L8 | V01 | 1 | Endangered | Wherever found |
| Habroscelimorpha dorsalis dorsalis | Northeastern beach tiger beetle | I02C | I01 | 5 | Threatened | Wherever found |
| Hackelia venusta | Showy stickseed | Q0XA | P01 | 1 | Endangered | Wherever found |
| Haematopus meadewaldoi | Canarian black oystercatcher | B09W | V01 | Foreign | Endangered | Wherever found |
| Haliaeetus albicilla groenlandicus | Greenland white-tailed eagle | B04Y | V01 | Foreign | Endangered | Wherever found |
| Haliaeetus vociferoides | Madagascar sea eagle | B09N | V01 | Foreign | Endangered | Wherever found |
| Haliotis cracherodii | Black Abalone | G0FU | I01 | NMFS | Endangered | Wherever found |
| Haliotis sorenseni | White Abalone | G0C8 | I01 | NMFS | Endangered | North America (West Coast from Point Conception, CA, U.S.A., to Punta Abreojos, Baja California, Mexico) |
| Hamiota altilis | Finelined pocketbook | F02X | I01 | 4 | Threatened | Wherever found |
| Hamiota australis | Southern Sandshell | F030 | I01 | 4 | Threatened | Wherever found |
| Hamiota perovalis | Orangenacre mucket | F01S | I01 | 4 | Threatened | Wherever found |
| Hamiota subangulata | Shinyrayed pocketbook | F02Y | I01 | 4 | Endangered | Wherever found |
| Haplostachys haplostachya | Honohono | Q1WW | P01 | 1 | Endangered | Wherever found |
| Harperocallis flava | Harper's beauty | Q1WX | P01 | 4 | Endangered | Entire |
| Harpia harpyja | Harpy eagle | B04Z | V01 | Foreign | Endangered | Wherever found |
| Harrisia (=Cereus) aboriginum (=gracilis) | Aboriginal Prickly-apple | Q0DR | P01 | 4 | Endangered | Entire |
| Harrisia portoricensis | Higo Chumbo | Q2AX | P01 | 4 | Threatened | Wherever found |
| Hedeoma todsenii | Todsen's pennyroyal | Q24C | P01 | 2 | Endangered | Wherever found |
| Hedyotis megalantha | Paudedo | Q3OX | P01 | 1 | Endangered | Wherever found |
| Hedyotis purpurea var. montana | Roan Mountain bluet | Q2B3 | P01 | 4 | Endangered | Wherever found |
| Helenium virginicum | Virginia sneezeweed | Q2P9 | P01 | 5 | Threatened | Wherever found |
| Helianthemum greenei | Island rush-rose | Q0YA | P01 | 8 | Threatened | Wherever found |
| Helianthus paradoxus | Pecos (=puzzle, =paradox) sunflower | Q0YJ | P01 | 2 | Threatened | Wherever found |
| Helianthus schweinitzii | Schweinitz's sunflower | Q2B7 | P01 | 4 | Endangered | Wherever found |
| Helianthus verticillatus | Whorled Sunflower | Q3HO | P01 | 4 | Endangered | Entire |
| Helminthoglypta walkeriana | Morro shoulderband (=Banded dune) snail | G00D | I01 | 8 | Threatened | Wherever found |
| Helonias bullata | Swamp pink | Q2B8 | P01 | 5 | Threatened | Entire |
| Hemiargus ceraunus antibubastus | Ceraunus Blue Butterfly | I0W5 | I01 | 4 | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Hemignathus wilsoni | akiapolaau | B001 | V01 | 1 | Endangered | Wherever found |
| Hemileuca maia menyanthevora (=H. iroquois) | bog buck moth | I0NM | I01 | 5 | Endangered | Wherever found |
| Hemiphaga novaeseelandiae chathamensis | Chatham Island pigeon | B02Z | V01 | Foreign | Endangered | Wherever found |
| Hemistena lata | Cracking pearlymussel | F01X | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Hemitragus jayakari | Arabian tahr | A07T | V01 | Foreign | Endangered | Wherever found |
| Hemitriccus kaempferi | Kaempfer's tody-tyrant | B0BG | V01 | Foreign | Endangered | Wherever found |
| Heraclides aristodemus ponceanus | Schaus swallowtail butterfly | I016 | I01 | 4 | Endangered | Wherever found |
| Heritiera longipetiolata | Ufa-halomtano | Q2PA | P01 | 1 | Endangered | Wherever found |
| Herpailurus (=Felis) yagouaroundi fossata | Guatemalan jaguarundi | A05I | V01 | Foreign | Endangered | Mexico,Nicaragua |
| Herpailurus (=Felis) yagouaroundi panamensis | Panamanian jaguarundi | A05J | V01 | Foreign | Endangered | Wherever found |
| Hesperia dacotae | Dakota Skipper | I011 | I01 | 3 | Threatened | Wherever found |
| Hesperia leonardus montana | Pawnee montane skipper | I01E | I01 | 6 | Threatened | Wherever found |
| Hesperolinon congestum | Marin dwarf-flax | Q1X6 | P01 | 8 | Threatened | Wherever found |
| Hesperomannia arborescens | No common name | Q1X7 | P01 | 1 | Endangered | Wherever found |
| Hesperomannia arbuscula | No common name | Q1X8 | P01 | 1 | Endangered | Wherever found |
| Hesperomannia lydgatei | No common name | Q1X9 | P01 | 1 | Endangered | Wherever found |
| Heterelmis comalensis | Comal Springs riffle beetle | I0MH | I01 | 2 | Endangered | Wherever found |
| Hexastylis naniflora | Dwarf-flowered heartleaf | Q1XA | P01 | 4 | Threatened | Wherever found |
| Hibiscadelphus distans | Kauai hau kuahiwi | Q1XB | P01 | 1 | Endangered | Wherever found |
| Hibiscadelphus giffardianus | Hau kuahiwi | Q0ZE | P01 | 1 | Endangered | Wherever found |
| Hibiscadelphus hualalaiensis | Hau kuahiwi | Q0ZF | P01 | 1 | Endangered | Wherever found |
| Hibiscadelphus woodii | Hau kuahiwi | Q3GL | P01 | 1 | Endangered | Wherever found |
| Hibiscus arnottianus ssp. immaculatus | Koki`o ke`oke`o | Q2BC | P01 | 1 | Endangered | Wherever found |
| Hibiscus brackenridgei | (=Native yellow hibiscus) ma`o hau hele | Q1XE | P01 | 1 | Endangered | Wherever found |
| Hibiscus clayi | Clay's hibiscus | Q1XF | P01 | 1 | Endangered | Wherever found |
| Hibiscus dasycalyx | Neches River rose-mallow | Q0ZH | P01 | 2 | Threatened | Wherever found |
| Hibiscus waimeae ssp. hannerae | Koki`o ke`oke`o | Q1XG | P01 | 1 | Endangered | Wherever found |
| Himantopus mexicanus knudseni | Hawaiian stilt | B04C | V01 | 1 | Endangered | Wherever found |
| Himantopus novaezelandiae | Black Stilt | B0CS | V01 | Foreign | Endangered | Wherever found |
| Hippocamelus antisensis | North Andean huemul | A05F | V01 | Foreign | Endangered | Wherever found |
| Hippocamelus bisulcus | South Andean huemul | A05G | V01 | Foreign | Endangered | Wherever found |
| Hipposideros ridleyi | Singapore roundleaf horseshoe bat | A09Z | V01 | Foreign | Endangered | Wherever found |
| Hippotragus niger variani | Giant sable antelope | A00I | V01 | Foreign | Endangered | Wherever found |
| Hoffmannseggia tenella | Slender rush-pea | Q1XI | P01 | 2 | Endangered | Wherever found |
| Holocarpha macradenia | Santa Cruz tarplant | Q0ZL | P01 | 8 | Threatened | Wherever found |
| Hudsonia montana | Mountain golden heather | Q2U5 | P01 | 4 | Threatened | Wherever found |
| Huso dauricus | Kaluga sturgeon | E0CK | V01 | NMFS | Endangered | Wherever found |
| Huso huso | Beluga sturgeon | E0A2 | V01 | Foreign | Threatened | Wherever found |
| Hyaena hyaena barbara | Barbary hyena | A01A | V01 | Foreign | Endangered | Wherever found |
| Hybognathus amarus | Rio Grande Silvery Minnow | E07I | V01 | 2 | Endangered | Wherever found, except where listed as an experimental population |
| Hydrobates castro | Band-rumped Storm-petrel | B08V | V01 | 1 | Endangered | USA (HI) |
| Hylaeus anthracinus | Anthricinan yellow-faced bee | I0GP | I01 | 1 | Endangered | Wherever found |
| Hylaeus assimulans | Assimulans yellow-faced bee | I0GQ | I01 | 1 | Endangered | Wherever found |
| Hylaeus facilis | Easy yellow-faced bee | I0GY | I01 | 1 | Endangered | Wherever found |
| Hylaeus hilaris | Hilaris yellow-faced bee | I0HT | I01 | 1 | Endangered | Wherever found |
| Hylaeus kuakea | Hawaiian yellow-faced bee | I0VM | I01 | 1 | Endangered | Wherever found |
| Hylaeus longiceps | Hawaiian yellow-faced bee | I0HC | I01 | 1 | Endangered | Wherever found |
| Hylaeus mana | Hawaiian yellow-faced bee | I0VL | I01 | 1 | Endangered | Wherever found |
| Hylobates spp. (including Nomascus) | Gibbons | A05A | V01 | Foreign | Endangered | Wherever found |
| Hymenophysa curta | Ayumodoki (loach) | E00J | V01 | Foreign | Endangered | Wherever found |
| Hymenoxys herbacea | Lakeside daisy | Q2U6 | P01 | 3 | Threatened | Wherever found |
| Hymenoxys texana | Texas prairie dawn-flower | Q2RK | P01 | 2 | Endangered | Wherever found |
| Hypericum cumulicola | Highlands scrub hypericum | Q1XJ | P01 | 4 | Endangered | Entire |
| Hypolepis hawaiiensis var. mauiensis | olua | S02Q | P01 | 1 | Endangered | Wherever found |
| Hypolimnas octocula marianensis | Mariana eight-spot butterfly | I0R7 | I01 | 1 | Endangered | Wherever found |
| Hypomesus transpacificus | Delta smelt | E070 | V01 | 8 | Threatened | Wherever found |
| Hypsipetes borbonicus olivaceus | Mauritius olivaceous Bulbul | B011 | V01 | Foreign | Endangered | Wherever found |
| Icaricia icarioides fenderi | Fender's blue butterfly | I0IS | I01 | 1 | Threatened | Wherever found |
| Icaricia icarioides missionensis | Mission blue butterfly | I00J | I01 | 8 | Endangered | Wherever found |
| Icaricia (Plebejus) shasta charlestonensis | Mount Charleston blue butterfly | I0TX | I01 | 8 | Endangered | Wherever found |
| Ictalurus pricei | Yaqui catfish | E02H | V01 | 2 | Threatened | Wherever found |
| Idaholanx fresti | Banbury Springs limpet | G05Q | I01 | 1 | Endangered | Wherever found |
| Ilex cookii | Cook's holly | Q2BO | P01 | 4 | Endangered | Wherever found |
| Ilex sintenisii | No common name | Q3AB | P01 | 4 | Endangered | Wherever found |
| Iliamna corei | Peter's Mountain mallow | Q2BP | P01 | 5 | Endangered | Wherever found |
| Indri indri | Indri lemur | A01F | V01 | Foreign | Endangered | Wherever found |
| Ipomopsis polyantha | Pagosa skyrocket | Q2U7 | P01 | 6 | Endangered | Wherever found |
| Ipomopsis sancti-spiritus | Holy Ghost ipomopsis | Q34D | P01 | 2 | Endangered | Wherever found |
| Iris lacustris | Dwarf lake iris | Q2BS | P01 | 3 | Threatened | Wherever found |
| Ischaemum byrone | Hilo ischaemum | Q2BT | P01 | 1 | Endangered | Wherever found |
| Ischnura luta | Rota blue damselfly | I0U8 | I01 | 1 | Endangered | Wherever found |
| Isodendrion hosakae | Aupaka | Q2BU | P01 | 1 | Endangered | Wherever found |
| Isodendrion laurifolium | Aupaka | Q108 | P01 | 1 | Endangered | Wherever found |
| Isodendrion longifolium | Aupaka | Q109 | P01 | 1 | Threatened | Wherever found |
| Isodendrion pyrifolium | wahine noho Kula | Q1XK | P01 | 1 | Endangered | Wherever found |
| Isoetes louisianensis | Louisiana quillwort | S00T | P01 | 4 | Endangered | Wherever found |
| Isoetes melanospora | Black spored quillwort | S015 | P01 | 4 | Endangered | Wherever found |
| Isoetes tegetiformans | Mat-forming quillwort | S019 | P01 | 4 | Endangered | Wherever found |
| Isopora crateriformis | No common name | P01X | I01 | NMFS | Threatened | Wherever found |
| Isotria medeoloides | Small whorled pogonia | Q1XL | P01 | 5 | Threatened | Entire |
| Ivesia kingii var. eremica | Ash Meadows ivesia | Q1XM | P01 | 8 | Threatened | Wherever found |
| Ivesia webberi | Webber's ivesia | Q34J | P01 | 8 | Threatened | Wherever found |
| Jacquemontia reclinata | Beach jacquemontia | Q2BZ | P01 | 4 | Endangered | Entire |
| Jatropha costaricensis | Costa Rican jatropha | Q24B | P01 | Foreign | Endangered | Wherever found |
| Joinvillea ascendens ascendens | `Ohe | Q1XN | P01 | 1 | Endangered | Wherever found |
| Juglans jamaicensis | West Indian Walnut (=Nogal) | Q34N | P01 | 4 | Endangered | Wherever found |
| Justicia cooleyi | Cooley's water-willow | Q1XO | P01 | 4 | Endangered | Entire |
| Juturnia kosteri | Koster's springsnail | G04C | I01 | 2 | Endangered | Wherever found |
| Kachuga tecta tecta | Indian sawback turtle | C01H | V01 | Foreign | Endangered | Wherever found |
| Kadua cookiana | 'Awiwi | Q1WY | P01 | 1 | Endangered | Wherever found |
| Kadua cordata remyi | kopa | Q33Y | P01 | 1 | Endangered | Wherever found |
| Kadua coriacea | Kio`ele | Q1WZ | P01 | 1 | Endangered | Wherever found |
| Kadua degeneri | No common name | Q1X0 | P01 | 1 | Endangered | Wherever found |
| Kadua fluviatilis | Kamapua`a | Q2U1 | P01 | 1 | Endangered | Wherever found |
| Kadua haupuensis | No common name | Q3OR | P01 | 1 | Endangered | Wherever found |
| Kadua laxiflora | pilo | Q1X1 | P01 | 1 | Endangered | Wherever found |
| Kadua parvula | No common name | Q1X2 | P01 | 1 | Endangered | Wherever found |
| Kadua st.-johnii | No common name | Q1X5 | P01 | 1 | Endangered | Wherever found |
| Kanaloa kahoolawensis | Kohe malama malama o Kanaloa | Q3GX | P01 | 1 | Endangered | Wherever found |
| Keysseria (=Lagenifera) erici | No common name | Q3HP | P01 | 1 | Endangered | Wherever found |
| Keysseria (=Lagenifera) helenae | No common name | Q3HQ | P01 | 1 | Endangered | Wherever found |
| Kinosternon sonoriense longifemorale | Sonoyta mud turtle | C067 | V01 | 2 | Endangered | Wherever found |
| Kobus leche | Red lechwe | A05O | V01 | Foreign | Threatened | Wherever found |
| Kokia cookei | Koki`o | Q1XP | P01 | 1 | Endangered | Wherever found |
| Kokia drynarioides | Koki`o | Q1XQ | P01 | 1 | Endangered | Wherever found |
| Kokia kauaiensis | Koki`o | Q1XR | P01 | 1 | Endangered | Wherever found |
| Korthalsella degeneri | Hulumoa | Q34P | P01 | 1 | Endangered | Wherever found |
| Labordia cyrtandrae | Kamakahala | Q2C2 | P01 | 1 | Endangered | Wherever found |
| Labordia helleri | Kamakahala | Q34Q | P01 | 1 | Endangered | Wherever found |
| Labordia lorenciana | No common name | Q3OT | P01 | 1 | Endangered | Wherever found |
| Labordia lydgatei | Kamakahala | Q2C3 | P01 | 1 | Endangered | Wherever found |
| Labordia pumila | Kamakahala | Q34R | P01 | 1 | Endangered | Wherever found |
| Labordia tinifolia var. lanaiensis | Kamakahala | Q2C4 | P01 | 1 | Endangered | Wherever found |
| Labordia tinifolia var. wahiawaensis | Kamakahala | Q3GM | P01 | 1 | Endangered | Wherever found |
| Labordia triflora | Kamakahala | Q11Y | P01 | 1 | Endangered | Wherever found |
| Lagorchestes hirsutus | Western hare wallaby | A03T | V01 | Foreign | Endangered | Wherever found |
| Lagostrophus fasciatus | Banded hare wallaby | A03P | V01 | Foreign | Endangered | Wherever found |
| Lagothrix flavicauda | Yellow-tailed woolly monkey | A06X | V01 | Foreign | Endangered | Wherever found |
| Lampsilis abrupta | Pink mucket (pearlymussel) | F00G | I01 | 3 | Endangered | Wherever found |
| Lampsilis higginsii | Higgins eye (pearlymussel) | F009 | I01 | 3 | Endangered | Wherever found |
| Lampsilis powellii | Arkansas fatmucket | F02I | I01 | 4 | Threatened | Wherever found |
| Lampsilis rafinesqueana | Neosho Mucket | F00F | I01 | 4 | Endangered | Wherever found |
| Lampsilis streckeri | Speckled pocketbook | F020 | I01 | 4 | Endangered | Wherever found |
| Lampsilis virescens | Alabama lampmussel | F00A | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Lanius ludovicianus mearnsi | San Clemente loggerhead shrike | B05R | V01 | 8 | Endangered | Wherever found |
| Larus audouinii | Audouin's gull | B01S | V01 | Foreign | Endangered | Wherever found |
| Larus relictus | Relict gull | B053 | V01 | Foreign | Endangered | Wherever found |
| Lasiorhinus krefftii (formerly L. barnardi and L. gillespiei) | Queensland hairy-nosed wombat (incl. Barnard's) | A04F | V01 | Foreign | Endangered | Wherever found |
| Lasiurus cinereus semotus | Hawaiian hoary bat | A03W | V01 | 1 | Endangered | Wherever found |
| Lasmigona decorata | Carolina heelsplitter | F02L | I01 | 4 | Endangered | Wherever found |
| Lasthenia burkei | Burke's goldfields | Q1XU | P01 | 8 | Endangered | Wherever found |
| Lasthenia conjugens | Contra Costa goldfields | Q122 | P01 | 8 | Endangered | Wherever found |
| Laterallus jamaicensis ssp. jamaicensis | Eastern Black rail | B0OB | V01 | 4 | Threatened | Wherever found |
| Laterallus tuerosi | Junin rail | B0BV | V01 | Foreign | Endangered | Wherever found |
| Latimeria chalumnae | African coelacanth | E0D9 | V01 | NMFS | Threatened | Tanzanian Distinct Population Segment (DPS) of African coelacanth |
| Layia carnosa | Beach layia | Q34T | P01 | 8 | Threatened | Wherever found |
| Leavenworthia crassa | Fleshy-fruit gladecress | Q12K | P01 | 4 | Endangered | Wherever found |
| Leavenworthia exigua laciniata | Kentucky glade cress | Q12F | P01 | 4 | Threatened | Wherever found |
| Leavenworthia texana | Texas golden Gladecress | Q34U | P01 | 2 | Endangered | Wherever found |
| Lednia tumana | Meltwater lednian stonefly | I0EE | I01 | 6 | Threatened | Wherever found |
| Leiolopisma telfairi | Round Island skink | C036 | V01 | Foreign | Threatened | Wherever found |
| Leiopelma hamiltoni | Stephen Island frog | D003 | V01 | Foreign | Endangered | Wherever found |
| Lemiox rimosus | Birdwing pearlymussel | F00I | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Lemuridae (incl. genera Lemur, Phaner, Hapalemur, Lepilemur, Microcebus, Allocebus, Cheirogaleus, Varecia) | Lemurs | A05P | V01 | Foreign | Endangered | Wherever found |
| Leontopithecus spp. | Golden-rumped tamarin | A02F | V01 | Foreign | Endangered | Wherever found |
| Leopardus (=Felis) pardalis | Ocelot | A084 | V01 | 2 | Endangered | wherever found |
| Leopardus (=Felis) tigrinus | Tiger cat | A03Z | V01 | Foreign | Endangered | Wherever found |
| Leopardus (=Felis) wiedii | Margay | A042 | V01 | Foreign | Endangered | Wherever found |
| Lepidium arbuscula | `Anaunau | Q12Y | P01 | 1 | Endangered | Wherever found |
| Lepidium barnebyanum | Barneby ridge-cress | Q1XV | P01 | 6 | Endangered | Wherever found |
| Lepidium orbiculare | No common name | Q3OM | P01 | 1 | Endangered | Wherever found |
| Lepidium papilliferum | Slickspot peppergrass | Q34X | P01 | 1 | Threatened | Entire |
| Lepidochelys kempii | Kemp's ridley sea turtle | C00O | V01 | 2 | Endangered | Wherever found |
| Lepidochelys olivacea | Olive ridley sea turtle | C00V | V01 | 1 | Threatened | Wherever found, except when listed as endangered under 50 CFR 224.101 |
| Lepidochelys olivacea | Olive ridley sea turtle | C00V | V02 | 4 | Endangered | Breeding colony populations on Pacific coast of Mexico |
| Lepidomeda albivallis | White River spinedace | E04P | V01 | 8 | Endangered | Wherever found |
| Lepidomeda mollispinis pratensis | Big Spring spinedace | E04L | V01 | 8 | Threatened | Wherever found |
| Lepidomeda vittata | Little Colorado spinedace | E04M | V01 | 2 | Threatened | Wherever found |
| Lepidurus packardi | Vernal pool tadpole shrimp | K048 | I01 | 8 | Endangered | Wherever found |
| Leporillus conditor | Stick-nest rat | A04C | V01 | Foreign | Endangered | Wherever found |
| Leptailurus (=Felis) serval constantina | Barbary serval | A02A | V01 | Foreign | Endangered | Wherever found |
| Leptasthenura xenothorax | White-browed tit-spinetail | B0BL | V01 | Foreign | Endangered | Wherever found |
| Leptocereus grantianus | No common name | Q34Y | P01 | 4 | Endangered | Wherever found |
| Leptodea leptodon | Scaleshell mussel | F00W | I01 | 3 | Endangered | Wherever found |
| Leptonycteris nivalis | Mexican long-nosed bat | A0AE | V01 | 2 | Endangered | Wherever found |
| Leptoptilos dubius | Greater adjutant | B0C3 | V01 | Foreign | Endangered | Wherever found |
| Leptotes cassius theonus | Cassius Blue Butterfly | I0W4 | I01 | 4 | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Leptotila rufaxilla wellsi | Grenada gray-fronted dove | B01C | V01 | Foreign | Endangered | Wherever found |
| Leptoxis ampla | Round rocksnail | G08D | I01 | 4 | Threatened | Wherever found |
| Leptoxis foremani | Interrupted (=Georgia) Rocksnail | G0C2 | I01 | 4 | Endangered | Wherever found |
| Leptoxis plicata | Plicate rocksnail | G08C | I01 | 4 | Endangered | Wherever found |
| Leptoxis taeniata | Painted rocksnail | G08B | I01 | 4 | Threatened | Wherever found |
| Lepyrium showalteri | Flat pebblesnail | G07F | I01 | 4 | Endangered | Wherever found |
| Lespedeza leptostachya | Prairie bush-clover | Q2CB | P01 | 3 | Threatened | Wherever found |
| Lesquerella congesta | Dudley Bluffs bladderpod | Q351 | P01 | 6 | Threatened | Wherever found |
| Lesquerella kingii ssp. bernardina | San Bernardino Mountains bladderpod | Q2CD | P01 | 8 | Endangered | Wherever found |
| Lesquerella lyrata | Lyrate bladderpod | Q1XX | P01 | 4 | Threatened | Wherever found |
| Lesquerella perforata | Spring Creek bladderpod | Q13H | P01 | 4 | Endangered | Wherever found |
| Lesquerella tumulosa | Kodachrome bladderpod | Q1XY | P01 | 6 | Endangered | Wherever found |
| Lessingia germanorum (=L.g. var. germanorum) | San Francisco lessingia | Q3AI | P01 | 8 | Endangered | Wherever found |
| Leucopeza semperi | Semper's warbler (=wood) | B03K | V01 | Foreign | Endangered | Wherever found |
| Leucopsar rothschildi | Rothschild's starling (myna) | B03B | V01 | Foreign | Endangered | Wherever found |
| Liatris helleri | Heller's blazingstar | Q2CI | P01 | 4 | Threatened | Wherever found |
| Liatris ohlingerae | Scrub blazingstar | Q1XZ | P01 | 4 | Endangered | Entire |
| Lichenostomus melanops cassidix (=Meliphaga c.) | Helmeted honeyeater | B041 | V01 | Foreign | Endangered | Wherever found |
| Lilaeopsis schaffneriana var. recurva | Huachuca water-umbel | Q2PK | P01 | 2 | Endangered | Wherever found |
| Lilium occidentale | Western lily | Q1Y0 | P01 | 8 | Endangered | Wherever found |
| Lilium pardalinum ssp. pitkinense | Pitkin Marsh lily | Q141 | P01 | 8 | Endangered | Wherever found |
| Limnanthes floccosa ssp. californica | Butte County meadowfoam | Q2YE | P01 | 8 | Endangered | Wherever found |
| Limnanthes pumila ssp. grandiflora | Large-flowered woolly meadowfoam | Q2CL | P01 | 1 | Endangered | Wherever found |
| Limnanthes vinculans | Sebastopol meadowfoam | Q1Y1 | P01 | 8 | Endangered | Wherever found |
| Lindera melissifolia | Pondberry | Q2CO | P01 | 4 | Endangered | Wherever found |
| Linum arenicola | Sand flax | Q14H | P01 | 4 | Endangered | Entire |
| Linum carteri carteri | Carter's small-flowered flax | Q14I | P01 | 4 | Endangered | Entire |
| Liophus ornatus | Maria Island snake | C056 | V01 | Foreign | Endangered | Wherever found |
| Lioplax cyclostomaformis | Cylindrical lioplax (snail) | G072 | I01 | 4 | Endangered | Wherever found |
| Lipochaeta fauriei | nehe | Q1Y4 | P01 | 1 | Endangered | Wherever found |
| Lipochaeta lobata var. leptophylla | nehe | Q1YC | P01 | 1 | Endangered | Wherever found |
| Lipochaeta micrantha | nehe | Q2CY | P01 | 1 | Endangered | Wherever found |
| Lipochaeta venosa | nehe | Q1YJ | P01 | 1 | Endangered | Wherever found |
| Lipochaeta waimeaensis | nehe | Q2D1 | P01 | 1 | Endangered | Wherever found |
| Lipotes vexillifer | Chinese River Dolphin | A0FQ | V01 | Foreign | Endangered | Wherever found |
| Lirceus usdagalun | Lee County cave isopod | K02C | I01 | 5 | Endangered | Wherever found |
| Lithophragma maximum | San Clemente Island woodland-star | Q14U | P01 | 8 | Endangered | Wherever found |
| Lobelia koolauensis | No common name | Q14Y | P01 | 1 | Endangered | Wherever found |
| Lobelia monostachya | No common name | Q2D2 | P01 | 1 | Endangered | Wherever found |
| Lobelia niihauensis | No common name | Q1YK | P01 | 1 | Endangered | Wherever found |
| Lobelia oahuensis | No common name | Q1YL | P01 | 1 | Endangered | Wherever found |
| Lomatium cookii | Cook's lomatium | Q356 | P01 | 1 | Endangered | Wherever found |
| Lontra (=Lutra) felina | Marine otter | A05Y | V01 | Foreign | Endangered | Wherever found |
| Lontra (=Lutra) longicaudis (incl. platensis) | Long-tailed otter | A05X | V01 | Foreign | Endangered | Wherever found |
| Lontra (=Lutra) provocax | Southern river otter | A05Z | V01 | Foreign | Endangered | Wherever found |
| Lophophorus lhuysii | Chinese monal pheasant | B03W | V01 | Foreign | Endangered | Wherever found |
| Lophophorus sclateri | Sclater's monal pheasant | B02V | V01 | Foreign | Endangered | Wherever found |
| Lophura edwardsi | Edward's pheasant | B02R | V01 | Foreign | Endangered | Wherever found |
| Lophura imperialis | Imperial pheasant | B02S | V01 | Foreign | Endangered | Wherever found |
| Lophura swinhoii | Swinhoe's pheasant | B02W | V01 | Foreign | Endangered | Wherever found |
| Loxioides bailleui | Palila (honeycreeper) | B00K | V01 | 1 | Endangered | Wherever found |
| Loxodonta africana | African elephant | A07U | V01 | Foreign | Threatened | Wherever found |
| Loxops caeruleirostris | Akekee | B0AF | V01 | 1 | Endangered | Wherever found |
| Loxops coccineus | Hawaii akepa | B044 | V01 | 1 | Endangered | Wherever found |
| Loxops mana | Hawaii creeper | B04M | V01 | 1 | Endangered | Wherever found |
| Lupinus aridorum | Scrub lupine | Q2PR | P01 | 4 | Endangered | Entire |
| Lupinus constancei | Lassics lupine | Q2PS | P01 | 8 | Endangered | Entire |
| Lupinus nipomensis | Nipomo Mesa lupine | Q161 | P01 | 8 | Endangered | Wherever found |
| Lupinus sulphureus ssp. kincaidii | Kincaid's Lupine | Q35E | P01 | 1 | Threatened | Wherever found |
| Lupinus tidestromii | Clover (Tidestrom''s) lupine | Q2DD | P01 | 8 | Endangered | Wherever found |
| Lycaeides argyrognomon lotis | Lotis blue butterfly | I00I | I01 | 8 | Endangered | Wherever found |
| Lycaeides melissa samuelis | Karner blue butterfly | I00F | I01 | 3 | Endangered | Wherever found |
| Lycaena hermes | Hermes copper butterfly | I05C | I01 | 8 | Threatened | Wherever found |
| Lycaon pictus | African wild dog | A0A1 | V01 | Foreign | Endangered | Wherever found |
| Lynx canadensis | Canada Lynx | A073 | V01 | 6 | Threatened | Wherever Found in Contiguous U.S. |
| Lynx (=Felis) rufus escuinapae | Mexican bobcat | A04S | V01 | Foreign | Endangered | Wherever found |
| Lyonia truncata var. proctorii | No common name | Q35F | P01 | 4 | Endangered | Wherever found |
| Lysimachia asperulaefolia | Rough-leaved loosestrife | Q2DF | P01 | 4 | Endangered | Wherever found |
| Lysimachia daphnoides | lehua makanoe | Q35G | P01 | 1 | Endangered | Wherever found |
| Lysimachia filifolia | No common name | Q2DG | P01 | 1 | Endangered | Wherever found |
| Lysimachia iniki | No common name | Q3MX | P01 | 1 | Endangered | Wherever found |
| Lysimachia lydgatei | No common name | Q35J | P01 | 1 | Endangered | Wherever found |
| Lysimachia maxima | No common name | Q35K | P01 | 1 | Endangered | Wherever found |
| Lysimachia pendens | No common name | Q3MY | P01 | 1 | Endangered | Wherever found |
| Lysimachia scopulensis | No common name | Q3MZ | P01 | 1 | Endangered | Wherever found |
| Lysimachia venosa | No common name | Q3H4 | P01 | 1 | Endangered | Wherever found |
| Macaca arctoides | Stump-tailed macaque | A06M | V01 | Foreign | Threatened | Wherever found |
| Macaca cyclopis | Formosan rock macaque | A06K | V01 | Foreign | Threatened | Wherever found |
| Macaca fuscata | Japanese macaque | A06L | V01 | Foreign | Threatened | Wherever found |
| Macaca silenus | Lion-tailed macaque | A01N | V01 | Foreign | Endangered | Wherever found |
| Macaca sinica | Toque macaque | A06N | V01 | Foreign | Threatened | Wherever found |
| Macbridea alba | White birds-in-a-nest | Q1YP | P01 | 4 | Threatened | Entire |
| Macrhybopsis tetranema | Peppered chub | E072 | V01 | 2 | Endangered | Wherever found |
| Macrocephalon maleo | Maleo megapode | B023 | V01 | Foreign | Endangered | Wherever found |
| Macropus giganteus tasmaniensis | Tasmanian forester kangaroo | A047 | V01 | Foreign | Endangered | Wherever found |
| Macropus parma | Parma wallaby | A03S | V01 | Foreign | Endangered | Wherever found |
| Macrotis lagotis | Rabbit bandicoot | A031 | V01 | Foreign | Endangered | Wherever found |
| Macrotis leucura | Lesser rabbit bandicoot | A02Z | V01 | Foreign | Endangered | Wherever found |
| Maesa walkeri | No common name | Q3OY | P01 | 1 | Threatened | Wherever found |
| Malaconotus alius | Ulugura bush-shrike | B09L | V01 | Foreign | Threatened | Wherever found |
| Malacothamnus fasciculatus var. nesioticus | Santa Cruz Island bush-mallow | Q16R | P01 | 8 | Endangered | Wherever found |
| Malacothrix indecora | Santa Cruz Island malacothrix | Q35Q | P01 | 8 | Endangered | Wherever found |
| Malacothrix squalida | Island malacothrix | Q3EK | P01 | 8 | Endangered | Wherever found |
| Malimbus ibadanensis | Ibadan malimbe | B09U | V01 | Foreign | Endangered | Wherever found |
| Mandrillus (=Papio) leucophaeus | Drill | A06F | V01 | Foreign | Endangered | Wherever found |
| Mandrillus (=Papio) sphinx | Mandrill | A06O | V01 | Foreign | Endangered | Wherever found |
| Manduca blackburni | Blackburn's sphinx moth | I0AL | I01 | 1 | Endangered | Wherever found |
| Manihot walkerae | Walker's manioc | Q1YS | P01 | 2 | Endangered | Wherever found |
| Manis temminckii | Temnick''s ground Pangolin | A060 | V01 | Foreign | Endangered | Wherever found |
| Margaritifera hembeli | Louisiana pearlshell | F02C | I01 | 4 | Threatened | Wherever found |
| Margaritifera marrianae | Alabama pearlshell | F01W | I01 | 4 | Endangered | Wherever found |
| Marmota vancouverensis | Vancouver Island marmot | A0A3 | V01 | Foreign | Endangered | Wherever found |
| Marshallia mohrii | Mohr's Barbara's buttons | Q1YT | P01 | 4 | Threatened | Wherever found |
| Marsilea villosa | Ihi`ihi | S00U | P01 | 1 | Endangered | Wherever found |
| Marstonia ogmorhaphe | Royal marstonia (snail) | G027 | I01 | 4 | Endangered | Wherever found |
| Marstonia pachyta | Armored snail | G03B | I01 | 4 | Endangered | Wherever found |
| Martes caurina | Pacific Marten, Coastal Distinct Population Segment | A0JI | V01 | 8 | Threatened | Wherever found |
| Martes flavigula chrysospila | Formosan yellow-throated marten | A01R | V01 | Foreign | Endangered | Wherever found |
| Masticophis lateralis euryxanthus | Alameda whipsnake (=striped racer) | C04A | V01 | 8 | Threatened | Wherever found |
| Meda fulgida | Spikedace | E05J | V01 | 2 | Endangered | Wherever found |
| Medionidus acutissimus | Alabama moccasinshell | F038 | I01 | 4 | Threatened | Wherever found |
| Medionidus parvulus | Coosa moccasinshell | F039 | I01 | 4 | Endangered | Wherever found |
| Medionidus penicillatus | Gulf moccasinshell | F03M | I01 | 4 | Endangered | Wherever found |
| Medionidus simpsonianus | Ochlockonee moccasinshell | F03N | I01 | 4 | Endangered | Wherever found |
| Medionidus walkeri | Suwannee moccasinshell | F03T | I01 | 4 | Threatened | Wherever found |
| Megadyptes antipodes | yellow-eyed penguin | B0FL | V01 | Foreign | Threatened | Wherever found |
| Megalagrion leptodemas | Crimson Hawaiian damselfly | I05V | I01 | 1 | Endangered | Wherever found |
| Megalagrion nesiotes | Flying earwig Hawaiian damselfly | I05X | I01 | 1 | Endangered | Wherever found |
| Megalagrion nigrohamatum nigrolineatum | Blackline Hawaiian damselfly | I05U | I01 | 1 | Endangered | Wherever found |
| Megalagrion oceanicum | Oceanic Hawaiian damselfly | I062 | I01 | 1 | Endangered | Wherever found |
| Megalagrion pacificum | Pacific Hawaiian damselfly | I064 | I01 | 1 | Endangered | Wherever found |
| Megalagrion xanthomelas | Orangeblack Hawaiian damselfly | I063 | I01 | 1 | Endangered | Wherever found |
| Megalonaias nicklineana | Nicklin's pearlymussel | F00Y | I01 | Foreign | Endangered | Wherever found |
| Megapodius laperouse | Micronesian megapode | B00T | V01 | 1 | Endangered | Wherever found |
| Megaptera novaeangliae | Humpback whale | A02Q | V03 | NMFS | Endangered | Cape Verde Island/Northwest Africa |
| Megaptera novaeangliae | Humpback whale | A02Q | V04 | NMFS | Endangered | Western North Pacific |
| Megaptera novaeangliae | Humpback whale | A02Q | V06 | NMFS | Threatened | Mexico DPS |
| Megaptera novaeangliae | Humpback whale | A02Q | V07 | NMFS | Endangered | Central America DPS |
| Megaptera novaeangliae | Humpback whale | A02Q | V15 | NMFS | Endangered | Arabian Sea DPS |
| Melanochelys tricarinata | Three-keeled Asian turtle | C01L | V01 | Foreign | Endangered | Wherever found |
| Melanosuchus niger | Black caiman | C00Y | V01 | Foreign | Endangered | Wherever found |
| Melanthera kamolensis | nehe | Q2CS | P01 | 1 | Endangered | Wherever found |
| Melanthera tenuifolia | nehe | Q2D0 | P01 | 1 | Endangered | Wherever found |
| Melicope adscendens | Alani | Q35V | P01 | 1 | Endangered | Wherever found |
| Melicope balloui | Alani | Q1YU | P01 | 1 | Endangered | Wherever found |
| Melicope christophersenii | Alani | Q1YV | P01 | 1 | Endangered | Wherever found |
| Melicope cornuta var. cornuta | No common name | Q37U | P01 | 1 | Endangered | Wherever found |
| Melicope cornuta var. decurrens | No common name | Q37V | P01 | 1 | Endangered | Wherever found |
| Melicope degeneri | Alani | Q1YX | P01 | 1 | Endangered | Wherever found |
| Melicope haupuensis | Alani | Q1YY | P01 | 1 | Endangered | Wherever found |
| Melicope hiiakae | Alani | Q2DJ | P01 | 1 | Endangered | Wherever found |
| Melicope knudsenii | Alani | Q1YZ | P01 | 1 | Endangered | Wherever found |
| Melicope lydgatei | Alani | Q1Z0 | P01 | 1 | Endangered | Wherever found |
| Melicope makahae | Alani | Q1Z2 | P01 | 1 | Endangered | Wherever found |
| Melicope mucronulata | Alani | Q1Z3 | P01 | 1 | Endangered | Wherever found |
| Melicope munroi | Alani | Q1Z4 | P01 | 1 | Endangered | Wherever found |
| Melicope ovalis | Alani | Q1Z7 | P01 | 1 | Endangered | Wherever found |
| Melicope pallida | Alani | Q1Z8 | P01 | 1 | Endangered | Wherever found |
| Melicope paniculata | Alani | Q1Z9 | P01 | 1 | Endangered | Wherever found |
| Melicope puberula | Alani | Q35Y | P01 | 1 | Endangered | Wherever found |
| Melicope quadrangularis | Alani | Q1ZA | P01 | 1 | Endangered | Wherever found |
| Melicope reflexa | Alani | Q1ZB | P01 | 1 | Endangered | Wherever found |
| Melicope remyi | No common name | Q1I5 | P01 | 1 | Endangered | Wherever found |
| Melicope rostrata | Pilo kea lau li`i | Q37W | P01 | 1 | Endangered | Wherever found |
| Melicope saint-johnii | Alani | Q17M | P01 | 1 | Endangered | Wherever found |
| Melicope zahlbruckneri | Alani | Q1ZC | P01 | 1 | Endangered | Wherever found |
| Melozone crissalis eremophilus | Inyo California towhee | B07Q | V01 | 8 | Threatened | Wherever found |
| Menidia extensa | Waccamaw silverside | E01P | V01 | 4 | Threatened | Wherever found |
| Menisciopsis boydiae | Kupukupu makali`i | S02E | P01 | 1 | Endangered | Wherever found |
| Mentzelia leucophylla | Ash Meadows blazingstar | Q1ZD | P01 | 8 | Threatened | Wherever found |
| Mergus octosetaceus | Brazillian merganser | B0BZ | V01 | Foreign | Endangered | Wherever found |
| Mesodon clarki nantahala | noonday snail | G00V | I01 | 4 | Threatened | Wherever found |
| Mezoneuron kavaiense | Uhiuhi | Q09U | P01 | 1 | Endangered | Wherever found |
| Microhexura montivaga | Spruce-fir moss spider | J014 | I01 | 4 | Endangered | Wherever found |
| Microlepia strigosa var. mauiensis | No common name | S02A | P01 | 1 | Endangered | Wherever found |
| Microtus californicus scirpensis | Amargosa vole | A082 | V01 | 8 | Endangered | Wherever found |
| Microtus pennsylvanicus dukecampbelli | Florida salt marsh vole | A0ET | V01 | 4 | Endangered | Wherever found |
| Mimizuku (=Otus) gurneyi | Giant scops owl | B05A | V01 | Foreign | Endangered | Wherever found |
| Mimulus michiganensis | Michigan monkey-flower | Q2DN | P01 | 3 | Endangered | Wherever found |
| Mimus graysoni | Socorro mockingbird | B0BA | V01 | Foreign | Endangered | Wherever found |
| Mirabilis macfarlanei | MacFarlane's four-o'clock | Q1ZF | P01 | 1 | Threatened | Wherever found |
| Mitracarpus maxwelliae | No common name | Q2DQ | P01 | 4 | Endangered | Wherever found |
| Mitracarpus polycladus | No common name | Q2DR | P01 | 4 | Threatened | Wherever found |
| Mitu mitu mitu | Razor-billed curassow | B04W | V01 | Foreign | Endangered | Wherever found |
| Moapa coriacea | Moapa dace | E002 | V01 | 8 | Endangered | Wherever found |
| Monachus monachus | Mediterranean monk seal | A028 | V01 | NMFS | Endangered | Wherever found |
| Monachus schauinslandi | Hawaiian monk seal | A071 | V01 | NMFS | Endangered | Wherever found |
| Monardella viminea | Willowy monardella | Q18M | P01 | 8 | Endangered | Wherever found |
| Monolopia (=Lembertia) congdonii | San Joaquin wooly-threads | Q34W | P01 | 8 | Endangered | Wherever found |
| Montipora australiensis | No common name | P017 | I01 | NMFS | Threatened | Wherever found |
| Morenia ocellata | Burmese peacock turtle | C01E | V01 | Foreign | Endangered | Wherever found |
| Moschus spp. (all species) | Musk deer | A056 | V01 | Foreign | Endangered | Afghanistan, Bhutan, Burma, China (Tibet, Yunnan), India, Nepal, Pakistan, Sikkim |
| Mucuna persericea | sea bean | Q3NZ | P01 | 1 | Endangered | Wherever found |
| Muntiacus feae | Fea's muntjac | A07Q | V01 | Foreign | Endangered | Wherever found |
| Mustela nigripes | Black-footed ferret | A004 | V01 | 6 | Endangered | Wherever found, except where listed as an experimental population |
| Myadestes lanaiensis rutha | Molokai `oloma`o | B04E | V01 | 1 | Endangered | Wherever found |
| Myadestes palmeri | Puaiohi | B00S | V01 | 1 | Endangered | Wherever found |
| Mycetophyllia ferox | Rough Cactus Coral | P006 | I01 | NMFS | Threatened | Wherever found |
| Mycteria americana | Wood stork | B06O | V01 | 4 | Threatened | U.S.A. (AL, FL, GA, MS, NC, SC) |
| Myotis grisescens | Gray bat | A04J | V01 | 3 | Endangered | Wherever found |
| Myotis septentrionalis | Northern Long-Eared Bat | A0JE | V01 | 3 | Endangered | Wherever found |
| Myotis sodalis | Indiana bat | A000 | V01 | 3 | Endangered | Wherever found |
| Myrcia paganii | No common name | Q2Q6 | P01 | 4 | Endangered | Wherever found |
| Myrmecobius fasciatus | Numbat | A044 | V01 | Foreign | Endangered | Wherever found |
| Myrsine fosbergii | Kolea | Q3HS | P01 | 1 | Endangered | Wherever found |
| Myrsine juddii | Kolea | Q36D | P01 | 1 | Endangered | Wherever found |
| Myrsine knudsenii | Kolea | Q3N0 | P01 | 1 | Endangered | Wherever found |
| Myrsine linearifolia | Kolea | Q193 | P01 | 1 | Threatened | Wherever found |
| Myrsine mezii | Kolea | Q2E5 | P01 | 1 | Endangered | Wherever found |
| Myrsine vaccinioides | Kolea | Q36E | P01 | 1 | Endangered | Wherever found |
| Naemorhedus (=Capricornis) sumatraensis | Serow | A064 | V01 | Foreign | Endangered | Wherever found |
| Naemorhedus goral | Goral | A05C | V01 | Foreign | Endangered | Wherever found |
| Nasalis concolor | Pagi Island langur | A01I | V01 | Foreign | Endangered | Wherever found |
| Nasalis larvatus | Proboscis monkey | A05U | V01 | Foreign | Endangered | Wherever found |
| Navarretia fossalis | Spreading navarretia | Q2E7 | P01 | 8 | Threatened | Wherever found |
| Navarretia leucocephala ssp. pauciflora (=N. pauciflora) | Few-flowered navarretia | Q19A | P01 | 8 | Endangered | Wherever found |
| Navarretia leucocephala ssp. plieantha | Many-flowered navarretia | Q19B | P01 | 8 | Endangered | Wherever found |
| Nectarinia prigoginei | Marungu sunbird | B0A4 | V01 | Foreign | Endangered | Wherever found |
| Nectophrynoides spp. | African viviparous toads | D00B | V01 | Foreign | Endangered | Wherever found |
| Necturus alabamensis | Black warrior (=Sipsey Fork) Waterdog | D030 | V01 | 4 | Endangered | Wherever found |
| Necturus lewisi | Neuse River waterdog | D00O | V01 | 4 | Threatened | Wherever found |
| Nemosia rourei | Cherry-throated tanager | B0DD | V01 | Foreign | Endangered | Wherever found |
| Neofelis nebulosa | Clouded leopard | A04L | V01 | Foreign | Endangered | Wherever found |
| Neomorphus geoffroyi dulcis | Southeastern rufous-vented ground cuckoo | B0CW | V01 | Foreign | Endangered | Wherever found |
| Neonympha mitchellii francisci | Saint Francis' satyr butterfly | I0MZ | I01 | 4 | Endangered | Wherever found |
| Neonympha mitchellii mitchellii | Mitchell's satyr Butterfly | I00K | I01 | 3 | Endangered | Wherever found |
| Neophema chrysogaster | Orange-bellied parakeet | B02C | V01 | Foreign | Endangered | Wherever found |
| Neoseps reynoldsi | Sand skink | C03V | V01 | 4 | Threatened | Wherever found |
| Neostapfia colusana | Colusa grass | Q19I | P01 | 8 | Threatened | Wherever found |
| Neotoma floridana smalli | Key Largo woodrat | A087 | V01 | 4 | Endangered | Wherever found |
| Neotoma fuscipes riparia | Riparian woodrat (=San Joaquin Valley) | A0FC | V01 | 8 | Endangered | Wherever found |
| Neotragus moschatus moschatus | Zanzibar suni | A07S | V01 | Foreign | Endangered | Wherever found |
| Neraudia angulata | No common name | Q1ZH | P01 | 1 | Endangered | Wherever found |
| Neraudia ovata | No common name | Q19L | P01 | 1 | Endangered | Wherever found |
| Neraudia sericea | No common name | Q1ZI | P01 | 1 | Endangered | Wherever found |
| Nerodia clarkii taeniata | Atlantic salt marsh snake | C01T | V01 | 4 | Threatened | Wherever found |
| Nerodia erythrogaster neglecta | Copperbelly water snake | C03X | V01 | 3 | Threatened | Indiana north of 40 degrees north latitude, Michigan, Ohio |
| Nervilia jacksoniae | No common name | Q3P2 | P01 | 1 | Threatened | Wherever found |
| Nesillas aldabranus | Aldabra Warbler (old world warbler) | B0AA | V01 | Foreign | Endangered | Wherever found |
| Nesogenes rotensis | No common name | Q3GY | P01 | 1 | Endangered | Wherever found |
| Newcombia cumingi | Newcomb's Tree snail | G09U | I01 | 1 | Endangered | Wherever found |
| Nicrophorus americanus | American burying beetle | I028 | I01 | 2 | Threatened | Wherever found, except where listed as an experimental population |
| Nipponia nippon | Japanese crested ibis | B01U | V01 | Foreign | Endangered | Wherever found |
| Nitrophila mohavensis | Amargosa niterwort | Q2E8 | P01 | 8 | Endangered | Wherever found |
| Nolina brittoniana | Britton's beargrass | Q2E9 | P01 | 4 | Endangered | Entire |
| Nothocestrum breviflorum | `Aiea | Q1ZJ | P01 | 1 | Endangered | Wherever found |
| Nothocestrum latifolium | `Aiea | Q19R | P01 | 1 | Endangered | Wherever found |
| Nothocestrum peltatum | `Aiea | Q1ZK | P01 | 1 | Endangered | Wherever found |
| Notomys aquilo | Australian native mouse | A05V | V01 | Foreign | Endangered | Wherever found |
| Nototrichium humile | Kulu`i | Q1ZL | P01 | 1 | Endangered | Wherever found |
| Notropis albizonatus | Palezone shiner | E04E | V01 | 4 | Endangered | Wherever found |
| Notropis buccula | Smalleye Shiner | E05Z | V01 | 2 | Endangered | Wherever found |
| Notropis cahabae | Cahaba shiner | E04C | V01 | 4 | Endangered | Wherever found |
| Notropis girardi | Arkansas River shiner | E05X | V01 | 2 | Threatened | Arkansas River Basin (AR, KS, NM, OK, TX) |
| Notropis mekistocholas | Cape Fear shiner | E01N | V01 | 4 | Endangered | Wherever found |
| Notropis oxyrhynchus | Sharpnose Shiner | E04K | V01 | 2 | Endangered | Wherever found |
| Notropis simus pecosensis | Pecos bluntnose shiner | E04F | V01 | 2 | Threatened | Wherever found |
| Notropis topeka (=tristis) | Topeka shiner | E07R | V01 | 6 | Endangered | Wherever found, except where listed as an experimental population |
| Noturus baileyi | Smoky madtom | E02C | V01 | 4 | Endangered | Wherever found |
| Noturus crypticus | Chucky Madtom | E07F | V01 | 4 | Endangered | Wherever found |
| Noturus flavipinnis | Yellowfin madtom | E01Y | V01 | 4 | Threatened | Wherever found, except where listed as an experimental population |
| Noturus furiosus | Carolina madtom | E03R | V01 | 4 | Endangered | Wherever found |
| Noturus munitus | Frecklebelly madtom | E01I | V02 | 4 | Threatened | Upper Coosa River Distinct Population Segment |
| Noturus placidus | Neosho madtom | E03S | V01 | 6 | Threatened | Wherever found |
| Noturus stanauli | Pygmy madtom | E03T | V01 | 4 | Endangered | Wherever found |
| Novisuccinea chittenangoensis | Chittenango ovate amber snail | G00P | I01 | 5 | Threatened | Wherever found |
| Numenius borealis | Eskimo curlew | B01A | V01 | 7 | Endangered | Wherever found |
| Numenius tenuirostris | Slender-billed curlew | B0BT | V01 | Foreign | Endangered | Wherever found |
| Nycticebus pygmaeus | Lesser slow loris | A06J | V01 | Foreign | Threatened | Wherever found |
| Oarisma poweshiek | Poweshiek skipperling | I0W1 | I01 | 3 | Endangered | Wherever found |
| Obovaria choctawensis | Choctaw bean | F01B | I01 | 4 | Endangered | Wherever found |
| Obovaria retusa | Ring pink (mussel) | F00S | I01 | 4 | Endangered | Wherever found |
| Obovaria subrotunda | Round hickorynut | F04X | I01 | 3 | Threatened | Wherever found |
| Ochrosia haleakalae | Holei | Q3ES | P01 | 1 | Endangered | Wherever found |
| Ochrosia kilaueaensis | Holei | Q2UX | P01 | 1 | Endangered | Wherever found |
| Odocoileus hemionus cerrosensis | Cedros Island mule Deer | A04K | V01 | Foreign | Endangered | Wherever found |
| Odocoileus virginianus clavium | Key deer | A003 | V01 | 4 | Endangered | Wherever found |
| Odocoileus virginianus leucurus | Columbian white-tailed deer | A002 | V01 | 1 | Threatened | Columbia River (Clark, Cowliz, Pacific, Skamania, and Wahkiakum Counties, WA., and Clatsop, Columbia, and Multnomah Counties, OR.) |
| Odontophorus strophium | Gorgeted wood-quail | B0CN | V01 | Foreign | Endangered | Wherever found |
| Oenothera deltoides ssp. howellii | Antioch Dunes evening-primrose | Q1ZN | P01 | 8 | Endangered | Wherever found |
| Oncorhynchus aguabonita whitei | Little Kern golden trout | E01Z | V01 | 8 | Threatened | Wherever found |
| Oncorhynchus apache | Apache trout | E00D | V01 | 2 | Threatened | Wherever found |
| Oncorhynchus clarkii henshawi | Lahontan cutthroat trout | E00Y | V01 | 8 | Threatened | Wherever found |
| Oncorhynchus clarkii seleniris | Paiute cutthroat trout | E00G | V01 | 8 | Threatened | Wherever found |
| Oncorhynchus clarkii stomias | Greenback Cutthroat trout | E00F | V01 | 6 | Threatened | Wherever found |
| Oncorhynchus gilae | Gila trout | E00E | V01 | 2 | Threatened | Wherever found |
| Oncorhynchus keta | Chum salmon | E09Q | V01 | NMFS | Threatened | Columbia River ESU See 50 CFR 223.102 |
| Oncorhynchus keta | Chum salmon | E09Q | V02 | NMFS | Threatened | Hood Canal summer-run ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) kisutch | Coho salmon | E08A | V01 | NMFS | Endangered | Central California Coast ESU - See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) kisutch | Coho salmon | E08A | V02 | NMFS | Threatened | Southern Oregon - Northern California Coast ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) kisutch | Coho salmon | E08A | V03 | NMFS | Threatened | Oregon Coast ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) kisutch | Coho salmon | E08A | V04 | NMFS | Threatened | Lower Columbia River ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V01 | NMFS | Threatened | California Central Valley DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V02 | NMFS | Threatened | Snake River Basin DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V03 | NMFS | Threatened | Central California Coast DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V04 | NMFS | Threatened | Lower Columbia River DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V05 | NMFS | Threatened | South-Central California Coast DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V06 | NMFS | Endangered | Southern California DPS - See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V07 | NMFS | Threatened | Upper Columbia River DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V08 | NMFS | Threatened | Upper Willamette River DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V09 | NMFS | Threatened | Middle Columbia River DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V10 | NMFS | Threatened | Northern California DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) mykiss | Steelhead (Rainbow Trout) | E08D | V13 | NMFS | Threatened | Puget Sound DPS - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) nerka | Sockeye salmon | E06Y | V01 | NMFS | Endangered | Snake River ESU - See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) nerka | Sockeye salmon | E06Y | V02 | NMFS | Threatened | Ozette Lake ESU - See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V01 | NMFS | Threatened | Snake River fall-run ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V02 | NMFS | Threatened | Snake River spring/summer-run ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V03 | NMFS | Endangered | Sacramento River winter-run ESU - See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V04 | NMFS | Threatened | Puget Sound ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V05 | NMFS | Threatened | Lower Columbia River ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V06 | NMFS | Threatened | Upper Willamette River ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V07 | NMFS | Endangered | Upper Columbia River spring-run ESU See 50 CFR 224.101 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V08 | NMFS | Threatened | Central Valley spring-run ESU See 50 CFR 223.102 |
| Oncorhynchus (=Salmo) tshawytscha | Chinook salmon | E06D | V09 | NMFS | Threatened | California Coastal ESU - See 50 CFR 223.102 |
| Onychogalea fraenata | Brindled nail-tailed wallaby | A03Q | V01 | Foreign | Endangered | Wherever found |
| Onychogalea lunata | Crescent nail-tailed wallaby | A03R | V01 | Foreign | Endangered | Wherever found |
| Opuntia treleasei | Bakersfield cactus | Q2YG | P01 | 8 | Endangered | Wherever found |
| Orbicella annularis | Lobed Star Coral | P003 | I01 | NMFS | Threatened | Wherever found |
| Orbicella faveolata | Mountainous Star Coral | P004 | I01 | NMFS | Threatened | Wherever found |
| Orbicella franksi | Boulder star coral | P01Y | I01 | NMFS | Threatened | Wherever found |
| Orcinus orca | Killer whale | A0IL | V01 | NMFS | Endangered | Southern Resident DPS See 50 CFR 224.101 |
| Orconectes shoupi | Nashville crayfish | K01S | I01 | 4 | Endangered | Wherever found |
| Orcuttia californica | California Orcutt grass | Q1ZO | P01 | 8 | Endangered | Wherever found |
| Orcuttia inaequalis | San Joaquin Valley Orcutt grass | Q1ZP | P01 | 8 | Threatened | Wherever found |
| Orcuttia pilosa | Hairy Orcutt grass | Q1AY | P01 | 8 | Endangered | Wherever found |
| Orcuttia tenuis | Slender Orcutt grass | Q1AZ | P01 | 8 | Threatened | Wherever found |
| Orcuttia viscida | Sacramento Orcutt grass | Q1ZQ | P01 | 8 | Endangered | Wherever found |
| Oreomystis bairdi | Akikiki | B0AI | V01 | 1 | Endangered | Wherever found |
| Oreophasis derbianus | Horned guan | B01R | V01 | Foreign | Endangered | Wherever found |
| Orthalicus reses (not incl. nesodryas) | Stock Island tree snail | G00Y | I01 | 4 | Threatened | Wherever found |
| Oryx dammah | Scimitar-horned oryx | A0G5 | V01 | Foreign | Endangered | Wherever found |
| Oryx leucoryx | Arabian oryx | A01Z | V01 | Foreign | Endangered | Wherever found |
| Oryzomys palustris natator | Silver rice rat | A083 | V01 | 4 | Endangered | Lower FL Keys (west of Seven Mile Bridge) |
| Osmoxylon mariannense | No common name | Q3GZ | P01 | 1 | Endangered | Wherever found |
| Osteolaemus tetraspis osborni | Congo dwarf crocodile | C012 | V01 | Foreign | Endangered | Wherever found |
| Osteolaemus tetraspis tetraspis | African dwarf crocodile | C010 | V01 | Foreign | Endangered | Wherever found |
| Ostodes strigatus | Snail [no common name] | G0A5 | I01 | 1 | Endangered | Wherever found |
| Ottoschulzia rhodoxylon | Palo de rosa | Q2EK | P01 | 4 | Threatened | Wherever found |
| Otus ireneae | Morden's owlet | B028 | V01 | Foreign | Endangered | Wherever found |
| Otus magicus (=insularis) insularis | Seychelles scops owl | B027 | V01 | Foreign | Endangered | Wherever found |
| Otus rutilus capnodes | Anjouan scops owl | B026 | V01 | Foreign | Endangered | Wherever found |
| Ovis ammon | Argali | A00J | V01 | Foreign | Endangered | Wherever found except Kyrgyzstan, Mongolia, and Tajikistan |
| Ovis ammon | Argali | A00J | V02 | Foreign | Threatened | Kyrgyzstan, Mongolia, and Tajikistan |
| Ovis canadensis nelsoni | Peninsular bighorn sheep | A0DR | V01 | 8 | Endangered | U.S.A. (CA) Peninsular Ranges |
| Ovis canadensis sierrae | Sierra Nevada bighorn sheep | A0DS | V01 | 8 | Endangered | U.S.A. (CA) Sierra Nevada |
| Ovis musimon ophion | Urial | A069 | V01 | Foreign | Endangered | Wherever found |
| Ovis vignei vignei | Shapo | A065 | V01 | Foreign | Endangered | Wherever found |
| Oxypolis canbyi | Canby's dropwort | Q2EL | P01 | 4 | Endangered | Wherever found |
| Oxytheca parishii var. goodmaniana | Cushenbury oxytheca | Q36L | P01 | 8 | Endangered | Wherever found |
| Oxytropis campestris var. chartacea | Fassett's locoweed | Q2EM | P01 | 3 | Threatened | Wherever found |
| Ozotoceros bezoarticus | Pampas deer | A057 | V01 | Foreign | Endangered | Wherever found |
| Pacifastacus fortis | Shasta crayfish | K01U | I01 | 8 | Endangered | Wherever found |
| Packera franciscana | San Francisco Peaks ragwort | Q21L | P01 | 2 | Threatened | Wherever found |
| Palaemonetes cummingi | Squirrel Chimney Cave shrimp | K02F | I01 | 4 | Threatened | Wherever found |
| Palaemonias alabamae | Alabama cave shrimp | K01V | I01 | 4 | Endangered | Wherever found |
| Palaemonias ganteri | Kentucky cave shrimp | K01X | I01 | 4 | Endangered | Wherever found |
| Palmeria dolei | `Akohekohe (crested honeycreeper) | B00E | V01 | 1 | Endangered | Wherever found |
| Pangasianodon gigas | Thailand giant catfish | E00M | V01 | Foreign | Endangered | Wherever found |
| Pangasius sanitwongsei | Catfish | E00L | V01 | Foreign | Endangered | Wherever found |
| Panicum fauriei var. carteri | Carter's panicgrass | Q1ZR | P01 | 1 | Endangered | Wherever found |
| Panicum niihauense | Lau `ehu | Q1BJ | P01 | 1 | Endangered | Wherever found |
| Pan paniscus | Pygmy chimpanzee | A06E | V01 | Foreign | Endangered | Wherever found |
| Panthalops hodgsonii | Tibetan antelope | A0HJ | V01 | Foreign | Endangered | Wherever found |
| Panthera leo ssp. leo | Lion | A0JZ | V01 | Foreign | Endangered | Wherever found |
| Panthera leo ssp. melanochaita | Lion | A0KO | V01 | Foreign | Threatened | Wherever found |
| Panthera onca | Jaguar | A040 | V01 | 2 | Endangered | Wherever found |
| Panthera pardus | Leopard | A01J | V01 | Foreign | Endangered | Wherever found, except where it is listed as Threatened |
| Panthera pardus | Leopard | A01J | V02 | Foreign | Threatened | In Africa, in the wild, south of, and including, the following countries: Gabon, Congo, Zaire, Uganda, Kenya |
| Panthera tigris | Tiger | A043 | V01 | Foreign | Endangered | Wherever found |
| Pan troglodytes | Chimpanzee | A06C | V02 | Foreign | Endangered | Wherever found |
| Papasula (=Sula) abbotti | Abbott's booby | B04P | V01 | Foreign | Endangered | Wherever found |
| Papilio chikae | Luzon peacock swallowtail butterfly | I0ML | I01 | Foreign | Endangered | Wherever found |
| Papilio homerus | Homerus swallowtail butterfly | I0MK | I01 | Foreign | Endangered | Wherever found |
| Papilio hospiton | Corsican swallowtail butterfly | I0MJ | I01 | Foreign | Endangered | Wherever found |
| Papustyla pulcherrima | Manus Island tree snail | G000 | I01 | Foreign | Endangered | Wherever found |
| Parahyaena (=Hyaena) brunnea | Brown Hyena | A01B | V01 | Foreign | Endangered | Wherever found |
| Pardofelis (=Felis) marmorata | Marbled cat | A04Z | V01 | Foreign | Endangered | Wherever found |
| Paronychia chartacea | Papery whitlow-wort | Q1ZV | P01 | 4 | Threatened | Entire |
| Paroreomyza maculata | O`ahu `alauahio | B046 | V01 | 1 | Endangered | Wherever found |
| Partula gibba | Humped tree snail | G0AC | I01 | 1 | Endangered | Wherever found |
| Partula langfordi | Langford's tree snail | G0AI | I01 | 1 | Endangered | Wherever found |
| Partula radiolata | Guam tree snail | G0A8 | I01 | 1 | Endangered | Wherever found |
| Partulina semicarinata | Lanai tree snail | G0AG | I01 | 1 | Endangered | Wherever found |
| Partulina variabilis | Lanai tree snail | G0AH | I01 | 1 | Endangered | Wherever found |
| Parvaspina collina | James spinymussel | F025 | I01 | 5 | Endangered | Wherever found |
| Parvaspina steinstansana | Tar River spinymussel | F015 | I01 | 4 | Endangered | Wherever found |
| Parvisedum leiocarpum | Lake County stonecrop | Q1C2 | P01 | 8 | Endangered | Wherever found |
| Patagioenas inornata wetmorei | Puerto Rican plain Pigeon | B049 | V01 | 4 | Endangered | Wherever found |
| Pavona diffluens | No common name | P01Q | I01 | NMFS | Threatened | Wherever found |
| Pectis imberbis | beardless chinchweed | Q2Q9 | P01 | 2 | Endangered | Wherever found |
| Pedicularis furbishiae | Furbish lousewort | Q1ZW | P01 | 5 | Threatened | Entire |
| Pediocactus bradyi | Brady pincushion cactus | Q1ZX | P01 | 2 | Endangered | Wherever found |
| Pediocactus despainii | San Rafael cactus | Q2QA | P01 | 6 | Endangered | Wherever found |
| Pediocactus (=Echinocactus,=Utahia) sileri | Siler pincushion cactus | Q200 | P01 | 2 | Threatened | Wherever found |
| Pediocactus knowltonii | Knowlton's cactus | Q1ZY | P01 | 2 | Endangered | Wherever found |
| Pediocactus peeblesianus ssp. fickeiseniae | Fickeisen plains cactus | Q1C9 | P01 | 2 | Endangered | Wherever found |
| Pediocactus peeblesianus ssp. peeblesianus | Peebles Navajo cactus | Q1ZZ | P01 | 2 | Endangered | Wherever found |
| Pediocactus winkleri | Winkler cactus | Q2QB | P01 | 6 | Threatened | Wherever found |
| Pedionomus torquatus | Plains wanderer (=collared-hemipode) | B04L | V01 | Foreign | Endangered | Wherever found |
| Pegias fabula | Littlewing pearlymussel | F00L | I01 | 4 | Endangered | Wherever found |
| Pekania pennanti | Fisher | A0HS | V05 | 8 | Endangered | Southern Sierra Nevada Distinct Population Segment |
| Peltophryne lemur | Puerto Rican crested toad | D00M | V01 | 4 | Threatened | Wherever found |
| Penelope albipennis | White-winged guan | B06A | V01 | Foreign | Endangered | Wherever found |
| Penelope perspicax | Cauca guan | B0CL | V01 | Foreign | Endangered | Wherever found |
| Penstemon debilis | Parachute beardtongue | Q36W | P01 | 6 | Threatened | Wherever found |
| Penstemon haydenii | Blowout penstemon | Q2EX | P01 | 6 | Endangered | Wherever found |
| Penstemon penlandii | Penland beardtongue | Q2YC | P01 | 6 | Endangered | Wherever found |
| Pentachaeta bellidiflora | White-rayed pentachaeta | Q2F3 | P01 | 8 | Endangered | Wherever found |
| Pentachaeta lyonii | Lyon's pentachaeta | Q1EA | P01 | 8 | Endangered | Wherever found |
| Pentalagus furnessi | Ryukyu rabbit | A07R | V01 | Foreign | Endangered | Japan (Ryukyu Islands) |
| Peperomia subpetiolata | `Ala `ala wai nui | Q201 | P01 | 1 | Endangered | Wherever found |
| Peperomia wheeleri | Wheeler's peperomia | Q2F6 | P01 | 4 | Endangered | Wherever found |
| Perameles bougainville | Barred bandicoot | A02Y | V01 | Foreign | Endangered | Wherever found |
| Perameles eremiana | Desert bandicoot | A045 | V01 | Foreign | Endangered | Wherever found |
| Percina antesella | Amber darter | E05F | V01 | 4 | Endangered | Wherever found |
| Percina aurolineata | Goldline darter | E05S | V01 | 4 | Threatened | Wherever found |
| Percina aurora | Pearl darter | E07A | V01 | 4 | Threatened | Wherever found |
| Percina jenkinsi | Conasauga logperch | E05H | V01 | 4 | Endangered | Wherever found |
| Percina pantherina | Leopard darter | E017 | V01 | 2 | Threatened | Wherever found |
| Percina rex | Roanoke logperch | E01G | V01 | 5 | Endangered | Wherever found |
| Percina williamsi | Sickle darter | E0CX | V01 | 4 | Threatened | Wherever found |
| Perognathus longimembris pacificus | Pacific pocket mouse | A0BY | V01 | 8 | Endangered | Wherever found |
| Peromyscus gossypinus allapaticola | Key Largo cotton mouse | A086 | V01 | 4 | Endangered | Wherever found |
| Peromyscus polionotus allophrys | Choctawhatchee beach mouse | A08B | V01 | 4 | Endangered | Wherever found |
| Peromyscus polionotus ammobates | Alabama beach mouse | A08Y | V01 | 4 | Endangered | Wherever found |
| Peromyscus polionotus niveiventris | Southeastern beach mouse | A0C9 | V01 | 4 | Threatened | wherever found |
| Peromyscus polionotus peninsularis | St. Andrew beach mouse | A0CB | V01 | 4 | Endangered | Wherever found |
| Peromyscus polionotus phasma | Anastasia Island beach mouse | A0BM | V01 | 4 | Endangered | Wherever found |
| Peromyscus polionotus trissyllepsis | Perdido Key beach mouse | A08C | V01 | 4 | Endangered | Wherever found |
| Petrogale xanthopus | Yellow-footed rock wallaby | A04E | V01 | Foreign | Endangered | Wherever found |
| Petroica multicolor multicolor | Scarlet-breasted robin (flycatcher) | B034 | V01 | Foreign | Endangered | Wherever found |
| Petroica traversi | Chatham Island robin | B033 | V01 | Foreign | Endangered | Wherever found |
| Peucedanum sandwicense | Makou | Q202 | P01 | 1 | Threatened | Wherever found |
| Pezoporus wallicus | Ground parrot | B04K | V01 | Foreign | Endangered | Wherever found |
| Phacelia argentea | Sand dune phacelia | Q2FB | P01 | 1 | Threatened | Entire |
| Phacelia argillacea | Clay phacelia | Q203 | P01 | 6 | Endangered | Wherever found |
| Phacelia formosula | North Park phacelia | Q204 | P01 | 6 | Endangered | Wherever found |
| Phacelia insularis ssp. insularis | Island phacelia | Q1FV | P01 | 8 | Endangered | Wherever found |
| Phacelia submutica | DeBeque phacelia | Q1G6 | P01 | 6 | Threatened | Wherever found |
| Phaenicophaeus pyrrhocephalus | Red-faced malkoha (cuckoo) | B022 | V01 | Foreign | Endangered | Wherever found |
| Phaeognathus hubrichti | Red Hills salamander | D00C | V01 | 4 | Threatened | Wherever found |
| Phaethornis malaris margarettae | Margaretta's hermit | B0CZ | V01 | Foreign | Endangered | Wherever found |
| Pharomachrus mocinno ssp. mocinno | Resplendent quetzel | B05L | V01 | Foreign | Endangered | Wherever found |
| Phascolarctos cinereus | Koala | A0HG | V01 | Foreign | Threatened | Australia |
| Phelsuma edwardnewtoni | Day gecko | C00A | V01 | Foreign | Endangered | Wherever found |
| Phelsuma guentheri | Round Island day gecko | C00B | V01 | Foreign | Endangered | Wherever found |
| Phlegmariurus mannii | Wawae`iole | S01K | P01 | 1 | Endangered | Wherever found |
| Phlegmariurus nutans | Wawae`iole | S01L | P01 | 1 | Endangered | Wherever found |
| Phlegmariurus stemmermanniae | No common name | S02B | P01 | 1 | Endangered | Wherever found |
| Phlox hirsuta | Yreka phlox | Q1GG | P01 | 8 | Endangered | Wherever found |
| Phlox nivalis ssp. texensis | Texas trailing phlox | Q205 | P01 | 2 | Endangered | Wherever found |
| Phoca hispida saimensis | Saimaa seal | A0GO | V01 | NMFS | Endangered | Wherever found |
| Phoca largha | Spotted Seal | A0K4 | V01 | NMFS | Threatened | Southern DPS - See 50 CFR 223.102 |
| Phoca (=Pusa) hispida botnica | Ringed Seal | A0KL | V01 | NMFS | Threatened | Wherever found |
| Phoca (=Pusa) hispida hispida | Ringed Seal | A0KJ | V01 | NMFS | Threatened | Wherever found |
| Phoca (=Pusa) hispida ladogensis | Ringed seal | A0KI | V01 | NMFS | Endangered | Ladoga subspecies |
| Phoca (=Pusa) hispida ochotensis | Ringed Seal | A0KK | V01 | NMFS | Threatened | Okhotsk subspecies |
| Phocoena sinus | Cochito | A0A6 | V01 | Foreign | Endangered | Wherever found |
| Phoebastria (=Diomedea) albatrus | Short-tailed albatross | B00Y | V03 | 7 | Endangered | Wherever found |
| Phoenicoparrus andinus | Andean flamingo | B0C0 | V01 | Foreign | Endangered | Wherever found |
| Phoxinus cumberlandensis | Blackside dace | E05I | V01 | 4 | Threatened | Wherever found |
| Phrynops hogei | Brazilian sideneck turtle | C04F | V01 | Foreign | Endangered | Wherever found |
| Phyllanthus saffordii | No common name | Q3OZ | P01 | 1 | Endangered | Wherever found |
| Phyllostegia bracteata | No common name | Q37F | P01 | 1 | Endangered | Wherever found |
| Phyllostegia brevidens | No common name | Q2VD | P01 | 1 | Endangered | Wherever found |
| Phyllostegia floribunda | No common name | Q1GZ | P01 | 1 | Endangered | Wherever found |
| Phyllostegia glabra var. lanaiensis | No common name | Q206 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia haliakalae | No common name | Q3O0 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia helleri | No common name | Q2FX | P01 | 1 | Endangered | Entire |
| Phyllostegia hirsuta | No common name | Q1H1 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia hispida | No common name | Q3H5 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia kaalaensis | No common name | Q3GS | P01 | 1 | Endangered | Wherever found |
| Phyllostegia knudsenii | No common name | Q1H2 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia mannii | No common name | Q3AE | P01 | 1 | Endangered | Wherever found |
| Phyllostegia mollis | No common name | Q2FT | P01 | 1 | Endangered | Wherever found |
| Phyllostegia parviflora | No common name | Q1H5 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia pilosa | No common name | Q3O1 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia racemosa | Kiponapona | Q37A | P01 | 1 | Endangered | Wherever found |
| Phyllostegia renovans | No common name | Q3N1 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia stachyoides | No common name | Q2FV | P01 | 1 | Endangered | Wherever found |
| Phyllostegia velutina | No common name | Q37B | P01 | 1 | Endangered | Wherever found |
| Phyllostegia waimeae | No common name | Q378 | P01 | 1 | Endangered | Wherever found |
| Phyllostegia warshaueri | No common name | Q37C | P01 | 1 | Endangered | Wherever found |
| Phyllostegia wawrana | No common name | Q37E | P01 | 1 | Endangered | Wherever found |
| Physaria douglasii ssp. tuplashensis | White Bluffs bladderpod | Q3HR | P01 | 1 | Threatened | Wherever found |
| Physaria filiformis | Missouri bladderpod | Q2CC | P01 | 3 | Threatened | Wherever found |
| Physaria globosa | Short's bladderpod | Q139 | P01 | 4 | Endangered | Wherever found |
| Physaria obcordata | Dudley Bluffs twinpod | Q2VH | P01 | 6 | Threatened | Wherever found |
| Physaria pallida | White bladderpod | Q2PE | P01 | 2 | Endangered | Wherever found |
| Physaria thamnophila | Zapata bladderpod | Q13L | P01 | 2 | Endangered | Wherever found |
| Physella natricina | Snake River physa snail | G01L | I01 | 1 | Endangered | Wherever found |
| Physeter catodon (=macrocephalus) | Sperm whale | A02T | V01 | NMFS | Endangered | Wherever found |
| Phytotoma raimondii | Peruvian plantcutter | B0BD | V01 | Foreign | Endangered | Wherever found |
| Picathartes gymnocephalus | White-necked rockfowl | B036 | V01 | Foreign | Endangered | Wherever found |
| Picathartes oreas | Grey-necked rockfowl | B035 | V01 | Foreign | Endangered | Wherever found |
| Picoides borealis | Red-cockaded woodpecker | B04F | V01 | 4 | Endangered | Wherever found |
| Pilosocereus robinii | Key tree cactus | Q208 | P01 | 4 | Endangered | Entire |
| Pinguicula ionantha | Godfrey's butterwort | Q2G0 | P01 | 4 | Threatened | Entire |
| Pinus albicaulis | Whitebark pine | R00E | P01 | 6 | Threatened | Wherever found |
| Pionopsitta pileata | Red-capped parrot | B05D | V01 | Foreign | Endangered | Wherever found |
| Piperia yadonii | Yadon's piperia | Q3FA | P01 | 8 | Endangered | Wherever found |
| Pipile jacutinga | Black-fronted piping-guan | B05I | V01 | Foreign | Endangered | Wherever found |
| Pipile pipile pipile | Trinidad white-headed curassow | B019 | V01 | Foreign | Endangered | Wherever found |
| Pithecophaga jefferyi | Philippine eagle | B01E | V01 | Foreign | Endangered | Wherever found |
| Pitta gurneyi | Gurney's pitta | B0BC | V01 | Foreign | Endangered | Wherever found |
| Pitta kochi | Koch's pitta | B05J | V01 | Foreign | Endangered | Wherever found |
| Pittosporum halophilum | Hoawa | Q2G8 | P01 | 1 | Endangered | Wherever found |
| Pittosporum hawaiiense | Hoawa | Q2G9 | P01 | 1 | Endangered | Wherever found |
| Pittosporum napaliense | Ho`awa | Q37I | P01 | 1 | Endangered | Wherever found |
| Pituophis melanoleucus lodingi | Black pinesnake | C029 | V01 | 4 | Threatened | Wherever found |
| Pituophis ruthveni | Louisiana pinesnake | C02C | V01 | 4 | Threatened | Wherever found |
| Pityopsis ruthii | Ruth's golden aster | Q2QK | P01 | 4 | Endangered | Wherever found |
| Plagiobothrys hirtus | rough popcornflower | Q1HU | P01 | 1 | Endangered | Wherever found |
| Plagiobothrys strictus | Calistoga allocarya | Q1HV | P01 | 8 | Endangered | Wherever found |
| Plagopterus argentissimus | Woundfin | E00Z | V01 | 6 | Endangered | Wherever found, except where listed as an experimental population |
| Planigale ingrami subtilissima | Little planigale | A03D | V01 | Foreign | Endangered | Wherever found |
| Planigale tenuirostris | Southern planigale | A03E | V01 | Foreign | Endangered | Wherever found |
| Planorbella magnifica | Magnificent ramshorn | G02R | I01 | 4 | Endangered | Wherever found |
| Plantago hawaiensis | Kuahiwi laukahi | Q37S | P01 | 1 | Endangered | Wherever found |
| Plantago princeps | Kuahiwi laukahi | Q20M | P01 | 1 | Endangered | Wherever found |
| Platanista gangetica minor | South Asian River dolphin | A0FR | V01 | Foreign | Endangered | Wherever found |
| Platanthera holochila | No common name | Q2GE | P01 | 1 | Endangered | Wherever found |
| Platanthera integrilabia | White fringeless orchid | Q2GF | P01 | 4 | Threatened | Entire |
| Platanthera leucophaea | Eastern prairie fringed orchid | Q2GG | P01 | 3 | Threatened | Wherever found |
| Platanthera praeclara | Western prairie fringed Orchid | Q2YD | P01 | 3 | Threatened | Wherever found |
| Platysteira laticincta | Banded wattle-eye | B0AB | V01 | Foreign | Endangered | Wherever found |
| Pleodendron macranthum | Chupacallos | Q2GH | P01 | 4 | Endangered | Wherever found |
| Plethobasus cicatricosus | White wartyback (pearlymussel) | F00M | I01 | 4 | Endangered | Wherever found |
| Plethobasus cooperianus | Orangefoot pimpleback (pearlymussel) | F00R | I01 | 4 | Endangered | Wherever found |
| Plethobasus cyphyus | Sheepnose Mussel | F046 | I01 | 3 | Endangered | Wherever found |
| Plethodon neomexicanus | Jemez Mountains salamander | D019 | V01 | 2 | Endangered | Wherever found |
| Plethodon nettingi | Cheat Mountain salamander | D011 | V01 | 5 | Threatened | Wherever found |
| Plethodon shenandoah | Shenandoah salamander | D01G | V01 | 5 | Endangered | Wherever found |
| Pleurobema athearni | Canoe Creek Clubshell | G0CH | I01 | 4 | Endangered | Wherever found |
| Pleurobema clava | Clubshell | F01D | I01 | 5 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Pleurobema curtum | Black clubshell | F011 | I01 | 4 | Endangered | Wherever found |
| Pleurobema decisum | Southern clubshell | F036 | I01 | 4 | Endangered | Wherever found |
| Pleurobema furvum | Dark pigtoe | F03A | I01 | 4 | Endangered | Wherever found |
| Pleurobema georgianum | Southern pigtoe | F03B | I01 | 4 | Endangered | Wherever found |
| Pleurobema hanleyianum | Georgia pigtoe | F03Z | I01 | 4 | Endangered | Wherever found |
| Pleurobema perovatum | Ovate clubshell | F035 | I01 | 4 | Endangered | Wherever found |
| Pleurobema plenum | Rough pigtoe | F00P | I01 | 4 | Endangered | Wherever found |
| Pleurobema pyriforme | Oval pigtoe | F02S | I01 | 4 | Endangered | Wherever found |
| Pleurobema strodeanum | Fuzzy pigtoe | F03V | I01 | 4 | Threatened | Wherever found |
| Pleurobema taitianum | Heavy pigtoe | F014 | I01 | 4 | Endangered | Wherever found |
| Pleurocera foremani | Rough hornsnail | G06V | I01 | 4 | Endangered | Wherever found |
| Pleuronaia dolabelloides | Slabside Pearlymussel | F01Y | I01 | 4 | Endangered | Wherever found |
| Pleuronaia gibber | Cumberland pigtoe | F033 | I01 | 4 | Endangered | Wherever found |
| Ploceus golandi | Clarke's weaver | B0AC | V01 | Foreign | Endangered | Wherever found |
| Poa atropurpurea | San Bernardino bluegrass | Q1I9 | P01 | 8 | Endangered | Wherever found |
| Poa mannii | Mann's bluegrass | Q2GL | P01 | 1 | Endangered | Wherever found |
| Poa napensis | Napa bluegrass | Q1ID | P01 | 8 | Endangered | Wherever found |
| Poa sandvicensis | Hawaiian bluegrass | Q20O | P01 | 1 | Endangered | Wherever found |
| Poa siphonoglossa | No common name | Q2GQ | P01 | 1 | Endangered | Wherever found |
| Podarcis pityusensis | Ibiza wall lizard | C04D | V01 | Foreign | Threatened | Wherever found |
| Podiceps taczanowskii | Junin grebe | B0C7 | V01 | Foreign | Endangered | Wherever found |
| Podilymbus gigas | Atitlan grebe | B01Q | V01 | Foreign | Endangered | Wherever found |
| Podocnemis expansa | Tartaruga | C00G | V01 | Foreign | Endangered | Wherever found |
| Podocnemis unifilis | Tracaja | C00K | V01 | Foreign | Endangered | Wherever found |
| Poeciliopsis occidentalis | Gila topminnow (incl. Yaqui) | E00C | V01 | 2 | Endangered | U.S. Only |
| Poecilotheria fasciata | Sri Lankan Ornamental Tarantula | J03O | I01 | Foreign | Endangered | Wherever found |
| Poecilotheria ornata | Fringed Ornamental Tarantula | J03T | I01 | Foreign | Endangered | Wherever found |
| Poecilotheria smithi | Kandy Parachute Spider | J03W | I01 | Foreign | Endangered | Wherever found |
| Poecilotheria subfusca | Ivory Ornamental Tarantula | J03Y | I01 | Foreign | Endangered | Wherever found |
| Poecilotheria vittata | Pederseni''s Tiger Spider | J03U | I01 | Foreign | Endangered | Wherever found |
| Pogogyne abramsii | San Diego mesa-mint | Q20P | P01 | 8 | Endangered | Wherever found |
| Pogogyne nudiuscula | Otay mesa-mint | Q2GS | P01 | 8 | Endangered | Wherever found |
| Polioptila californica californica | Coastal California gnatcatcher | B08X | V01 | 8 | Threatened | Wherever found |
| Polygala lewtonii | Lewton's polygala | Q20Q | P01 | 4 | Endangered | Entire |
| Polygala smallii | Tiny polygala | Q2GW | P01 | 4 | Endangered | Entire |
| Polygonella basiramia | Wireweed | Q20R | P01 | 4 | Endangered | Entire |
| Polygonella myriophylla | Sandlace | Q20S | P01 | 4 | Endangered | Entire |
| Polygonum hickmanii | Scotts Valley Polygonum | Q3HV | P01 | 8 | Endangered | Wherever found |
| Polygyriscus virginianus | Virginia fringed mountain snail | G00Z | I01 | 5 | Endangered | Wherever found |
| Polyphylla barbata | Mount Hermon June beetle | I0OV | I01 | 8 | Endangered | Wherever found |
| Polyplectron emphanum | Palawan peacock pheasant | B02U | V01 | Foreign | Endangered | Wherever found |
| Polyscias bisattenuata | No common name | Q22G | P01 | 1 | Endangered | Wherever found |
| Polyscias flynnii | No common name | Q3N2 | P01 | 1 | Endangered | Wherever found |
| Polyscias gymnocarpa | `Ohe`ohe | Q22F | P01 | 1 | Endangered | Wherever found |
| Polyscias lydgatei | No common name | Q22R | P01 | 1 | Endangered | Wherever found |
| Polyscias racemosa | No common name | Q1ZG | P01 | 1 | Endangered | Wherever found |
| Polystichum aleuticum | Aleutian shield fern | S00V | P01 | 7 | Endangered | Wherever found |
| Polystichum calderonense | No common name | S01V | P01 | 4 | Endangered | Wherever found |
| Polysticta stelleri | Steller's Eider | B090 | V01 | 7 | Threatened | U.S. Alaska breeding population only |
| Pomarea nigra | Tahiti flycatcher | B01L | V01 | Foreign | Endangered | Wherever found |
| Pongo pygmaeus | Orangutan | A01Y | V01 | Foreign | Endangered | Wherever found |
| Popenaias popeii | Texas Hornshell | F02M | I01 | 2 | Endangered | Wherever found |
| Porites napopora | No common name | P01H | I01 | NMFS | Threatened | Wherever found |
| Portulaca sclerocarpa | Po`e | Q20T | P01 | 1 | Endangered | Wherever found |
| Portulaca villosa | Ihi | Q381 | P01 | 1 | Endangered | Wherever found |
| Potamilus capax | Fat pocketbook | F00T | I01 | 4 | Endangered | Wherever found |
| Potamilus inflatus | Inflated heelsplitter | F01O | I01 | 4 | Threatened | Wherever found |
| Potamogeton clystocarpus | Little Aguja (=Creek) Pondweed | Q20U | P01 | 2 | Endangered | Wherever found |
| Potentilla hickmanii | Hickman's potentilla | Q1J8 | P01 | 8 | Endangered | Wherever found |
| Presbytis potenziani | Long-tailed langur | A06H | V01 | Foreign | Threatened | Indonesia |
| Presbytis senex | Purple-faced langur | A06I | V01 | Foreign | Threatened | Wherever found |
| Prietella phreatophila | Mexican blindcat (catfish) | E00K | V01 | Foreign | Endangered | Wherever found |
| Primula maguirei | Maguire primrose | Q2H5 | P01 | 6 | Threatened | Wherever found |
| Priodontes maximus | Giant armadillo | A04O | V01 | Foreign | Endangered | Wherever found |
| Prionailurus (=Felis) bengalensis bengalensis | Leopard cat | A04Y | V01 | Foreign | Endangered | Wherever found |
| Prionailurus (=Felis) bengalensis iriomotensis | Iriomote cat | A079 | V01 | Foreign | Endangered | Wherever found |
| Prionailurus (=Felis) planiceps | Flat-headed cat | A04X | V01 | Foreign | Endangered | Wherever found |
| Prionodon pardicolor | Spotted linsang | A05Q | V01 | Foreign | Endangered | Wherever found |
| Pristis clavata | Dwarf sawfish | E0D2 | V01 | NMFS | Endangered | Wherever found |
| Pristis pectinata | Smalltooth sawfish | E0A9 | V01 | NMFS | Endangered | US DPS - Smalltooth sawfish originating from U.S. waters. |
| Pristis pectinata | Smalltooth sawfish | E0A9 | V02 | NMFS | Endangered | Non-US DPS - Smalltooth sawfish originating from non-US waters |
| Pristis pristis | Largetooth Sawfish | E0CG | V01 | NMFS | Endangered | Wherever found |
| Pristis zijsron | Green sawfish | E0D3 | V01 | NMFS | Endangered | Wherever found |
| Pritchardia aylmer-robinsonii | loulu | Q1JK | P01 | 1 | Endangered | Wherever found |
| Pritchardia bakeri | loulu | Q3ON | P01 | 1 | Endangered | Wherever found |
| Pritchardia hardyi | loulu | Q38C | P01 | 1 | Endangered | Wherever found |
| Pritchardia kaalae | loulu | Q2VM | P01 | 1 | Endangered | Wherever found |
| Pritchardia lanigera | loulu | Q1JR | P01 | 1 | Endangered | Wherever found |
| Pritchardia maideniana | loulu | Q38B | P01 | 1 | Endangered | Wherever found |
| Pritchardia munroi | loulu | Q20W | P01 | 1 | Endangered | Wherever found |
| Pritchardia napaliensis | loulu | Q38D | P01 | 1 | Endangered | Wherever found |
| Pritchardia remota | loulu | Q1JS | P01 | 1 | Endangered | Wherever found |
| Pritchardia schattaueri | loulu | Q2VN | P01 | 1 | Endangered | Wherever found |
| Pritchardia viscosa | loulu | Q38E | P01 | 1 | Endangered | Wherever found |
| Probarbus jullieni | Ikan temoleh (minnow) | E01V | V01 | Foreign | Endangered | Wherever found |
| Procambarus econfinae | Panama City crayfish | K05P | I01 | 4 | Threatened | Wherever found |
| Procaris hawaiana | Anchialine pool Shrimp | K03B | I01 | 1 | Endangered | Wherever found |
| Procolobus (=Colobus) pennantii (=kirki) kirki | Zanzibar red colobus monkey | A01X | V01 | Foreign | Endangered | Wherever found |
| Procolobus (=Colobus) preussi (=badius p.) | Preuss' red colobus monkey | A0A4 | V01 | Foreign | Endangered | Wherever found |
| Procolobus (=Colobus) rufomitratus (=badius r.) | Tana River red colobus monkey | A01V | V01 | Foreign | Endangered | Wherever found |
| Propithecus spp. | Sifakas | A03N | V01 | Foreign | Endangered | Wherever found |
| Prunus geniculata | Scrub plum | Q20X | P01 | 4 | Endangered | Entire |
| Psammobates geometricus | Geometric turtle | C01G | V01 | Foreign | Endangered | Wherever found |
| Psephotus chrysopterygius | Golden-shouldered parakeet | B02B | V01 | Foreign | Endangered | Wherever found |
| Psephotus pulcherrimus | Paradise parakeet | B02D | V01 | Foreign | Endangered | Wherever found |
| Pseudemydura umbrina | Short-necked or western swamp turtle | C00M | V01 | Foreign | Endangered | Wherever found |
| Pseudemys alabamensis | Alabama red-bellied turtle | C01W | V01 | 4 | Endangered | Wherever found |
| Pseudemys rubriventris bangsi | Plymouth Redbelly Turtle = Plymouth Redbelly Cooter | C021 | V01 | 5 | Endangered | Wherever found |
| Pseudibis gigantea | Giant ibis | B0C2 | V01 | Foreign | Endangered | Wherever found |
| Pseudobahia bahiifolia | Hartweg's golden sunburst | Q1K2 | P01 | 8 | Endangered | Wherever found |
| Pseudobahia peirsonii | San Joaquin adobe sunburst | Q1K3 | P01 | 8 | Threatened | Wherever found |
| Pseudobulweria macgillivrayi | Fiji petrel | B0C5 | V01 | Foreign | Endangered | Wherever found |
| Pseudocopaeodes eunus obscurus | Carson wandering skipper | I0RG | I01 | 8 | Endangered | Wherever found |
| Pseudognaphalium sandwicensium var. molokaiense | `Ena`ena | Q1WN | P01 | 1 | Endangered | Wherever found |
| Pseudomys fieldi | Field's mouse | A037 | V01 | Foreign | Endangered | Wherever found |
| Pseudomys fumeus | Smoky mouse | A03B | V01 | Foreign | Endangered | Wherever found |
| Pseudomys gouldii | Gould's mouse | A048 | V01 | Foreign | Endangered | Wherever found |
| Pseudomys novaehollandiae | New Holland mouse | A038 | V01 | Foreign | Endangered | Wherever found |
| Pseudomys occidentalis | Western mouse | A03C | V01 | Foreign | Endangered | Wherever found |
| Pseudomys praeconis | Shark Bay mouse | A039 | V01 | Foreign | Endangered | Wherever found |
| Pseudomys shortridgei | Shortridge's mouse | A03A | V01 | Foreign | Endangered | Wherever found |
| Pseudonestor xanthophrys | Maui parrotbill (Kiwikiu) | B00M | V01 | 1 | Endangered | Wherever found |
| Pseudorca crassidens | false killer whale | A0KX | V01 | NMFS | Endangered | Main Hawaiian Islands Insular DPS See 50 CFR 224.101 |
| Pseudotryonia adamantina | Diamond Tryonia | G04W | I01 | 2 | Endangered | Wherever found |
| Psittacula echo | Mauritius parakeet | B03V | V01 | Foreign | Endangered | Wherever found |
| Psittirostra psittacea | `O`u (honeycreeper) | B00J | V01 | 1 | Endangered | Wherever found |
| Psophodes nigrogularis | Western whipbird | B03M | V01 | Foreign | Endangered | Wherever found |
| Psychotria grandiflora | Kopiko | Q1KB | P01 | 1 | Endangered | Wherever found |
| Psychotria hexandra var. oahuensis | Kopiko | Q3H6 | P01 | 1 | Endangered | Wherever found |
| Psychotria hobdyi | Kopiko | Q38F | P01 | 1 | Endangered | Wherever found |
| Psychotria malaspinae | Aplokating-palaoan | Q3P0 | P01 | 1 | Endangered | Wherever found |
| Pteralyxia kauaiensis | Kaulu | Q20Y | P01 | 1 | Endangered | Wherever found |
| Pteralyxia macrocarpa | Kaulu | Q1KE | P01 | 1 | Endangered | Wherever found |
| Pteris lidgatei | No common name | S00W | P01 | 1 | Endangered | Wherever found |
| Pterodroma aterrima | Mascarene black petrel | B09Z | V01 | Foreign | Endangered | Wherever found |
| Pterodroma axillaris | Chatham Island petrel | B0CH | V01 | Foreign | Endangered | Wherever found |
| Pterodroma cahow | Bermuda petrel | B015 | V01 | 4 | Endangered | Wherever found |
| Pterodroma hasitata | Black-capped Petrel | B0AS | V01 | 4 | Endangered | Wherever found |
| Pterodroma madeira | Freira | B09Y | V01 | Foreign | Endangered | Wherever found |
| Pterodroma magentae | Magenta petrel | B0CI | V01 | Foreign | Endangered | Wherever found |
| Pterodroma phaeopygia | Galapagos petrel | B0CJ | V01 | Foreign | Threatened | Wherever found |
| Pterodroma sandwichensis | Hawaiian petrel | B00N | V01 | 1 | Endangered | Wherever found |
| Pteronura brasiliensis | Giant otter | A020 | V01 | Foreign | Endangered | South America |
| Pteropus mariannus mariannus | Mariana fruit Bat (=Mariana flying fox) | A07X | V04 | 1 | Threatened | Wherever found |
| Pteropus rodricensis | Rodrigues fruit bat (=flying fox) | A09Y | V01 | Foreign | Endangered | Wherever found |
| Ptilimnium nodosum | Harperella | Q2H9 | P01 | 5 | Endangered | Wherever found |
| Ptychobranchus greenii | Triangular Kidneyshell | F037 | I01 | 4 | Endangered | Wherever found |
| Ptychobranchus jonesi | Southern kidneyshell | F02N | I01 | 4 | Endangered | Wherever found |
| Ptychobranchus subtentus | Fluted kidneyshell | F041 | I01 | 4 | Endangered | Wherever found |
| Ptychocheilus lucius | Colorado pikeminnow | E006 | V01 | 6 | Endangered | Wherever found, except where listed as an experimental population |
| Pudu pudu | Pudu | A061 | V01 | Foreign | Endangered | Wherever found |
| Puffinus heinrothi | Heinroth's shearwater | B0C4 | V01 | Foreign | Threatened | Wherever found |
| Puffinus newelli | Newell''s shearwater | B04O | V01 | 1 | Threatened | Wherever found |
| Puma (=Felis) concolor (all subsp. except coryi) | Puma (=mountain lion) | A0G0 | V01 | 4 | Similarity of Appearance to a Threatened Taxon | U.S.A. (FL) |
| Puma (=Felis) concolor coryi | Florida panther | A008 | V01 | 4 | Endangered | Wherever found |
| Puma (=Felis) concolor costaricensis | Costa Rican puma | A062 | V01 | Foreign | Endangered | Wherever found |
| Puma yagouaroundi cacomitli | Gulf Coast jaguarundi | A05H | V01 | 2 | Endangered | Wherever found |
| Puma yagouaroundi tolteca | Sinaloan jaguarundi | A05K | V01 | Foreign | Endangered | Wherever found |
| Purshia (=Cowania) subintegra | Arizona Cliffrose | Q20Z | P01 | 2 | Endangered | Wherever found |
| Pygathrix nemaeus | Douc langur | A01H | V01 | Foreign | Endangered | Wherever found |
| Pyrgulopsis bernardina | San Bernardino springsnail | G05E | I01 | 2 | Threatened | Wherever found |
| Pyrgulopsis bruneauensis | Bruneau Hot springsnail | G03R | I01 | 1 | Endangered | Wherever found |
| Pyrgulopsis chupaderae | Chupadera springsnail | G03S | I01 | 2 | Endangered | Wherever found |
| Pyrgulopsis neomexicana | Socorro springsnail | G05P | I01 | 2 | Endangered | Wherever found |
| Pyrgulopsis roswellensis | Roswell springsnail | G03T | I01 | 2 | Endangered | Wherever found |
| Pyrgulopsis texana | Phantom Springsnail | G00X | I01 | 2 | Endangered | Wherever found |
| Pyrgulopsis trivialis | Three Forks Springsnail | G051 | I01 | 2 | Endangered | Wherever found |
| Pyrgus ruralis lagunae | Laguna Mountains skipper | I0LW | I01 | 8 | Endangered | Wherever found |
| Pyriglena atra | Fringe-backed fire-eye | B0D3 | V01 | Foreign | Endangered | Wherever found |
| Pyrrhula pyrrhula murina | Sao Miguel bullfinch (finch) | B012 | V01 | Foreign | Endangered | Wherever found |
| Pyrrhura cruentata | Blue-throated (=ochre-marked) parakeet | B029 | V01 | Foreign | Endangered | Wherever found |
| Python molurus molurus | Indian python | C01A | V01 | Foreign | Endangered | Wherever found |
| Quadrula cylindrica cylindrica | Rabbitsfoot | F03X | I01 | 4 | Threatened | Wherever found |
| Quadrula cylindrica strigillata | Rough rabbitsfoot | F00V | I01 | 5 | Endangered | Wherever found |
| Quadrula fragosa | Winged Mapleleaf | F00C | I01 | 3 | Endangered | Wherever found, except where listed as an experimental population |
| Quercus hinckleyi | Hinckley oak | Q211 | P01 | 2 | Threatened | Wherever found |
| Quisicalus palustris | Slender-billed Grackle | B01O | V01 | Foreign | Endangered | Wherever found |
| Rallus obsoletus levipes | Light-footed Ridgway''s rail | B04B | V01 | 8 | Endangered | Wherever found |
| Rallus obsoletus obsoletus | California Ridgway''s rail | B04A | V01 | 8 | Endangered | Wherever found |
| Rallus obsoletus yumanensis | Yuma Ridgway's rail | B00P | V01 | 2 | Endangered | Wherever found |
| Rallus pectoralis muelleri | Aukland Island rail | B031 | V01 | Foreign | Endangered | Wherever found |
| Ramphocinclus brachyurus | White-breasted thrasher | B03D | V01 | Foreign | Endangered | Wherever found |
| Ramphodon (=Glaucis) dohrnii | Hook-billed hermit (hummingbird) | B054 | V01 | Foreign | Endangered | Wherever found |
| Rana boylii | Foothill yellow-legged frog | D02G | V02 | 8 | Threatened | California, Central Coast Range south of San Francisco Bay to San Benito and Fresno Counties |
| Rana boylii | Foothill yellow-legged frog | D02G | V03 | 8 | Endangered | California, Coast Range from Monterey County south to Los Angeles County |
| Rana boylii | Foothill yellow-legged frog | D02G | V04 | 8 | Endangered | California, Sierra Nevada Mountains south of American River sub-basin south to Transverse Range, Kern County |
| Rana boylii | Foothill yellow-legged frog | D02G | V05 | 8 | Threatened | California, North Feather River watershed largely in Plumas and Butte Counties |
| Rana chiricahuensis | Chiricahua leopard frog | D02F | V01 | 2 | Threatened | Wherever found |
| Rana draytonii | California red-legged frog | D02D | V01 | 8 | Threatened | Wherever found |
| Rana muscosa | Mountain yellow-legged frog | D02H | V01 | 8 | Endangered | U.S.A., southern California |
| Rana muscosa | Mountain yellow-legged frog | D02H | V02 | 8 | Endangered | U.S.A., northern California |
| Rana pretiosa | Oregon spotted frog | D02A | V01 | 1 | Threatened | Wherever found |
| Rana sevosa | dusky gopher frog | D031 | V01 | 4 | Endangered | Wherever found |
| Rana sierrae | Sierra Nevada Yellow-legged Frog | D04M | V01 | 8 | Endangered | Wherever found |
| Rangifer tarandus ssp. caribou | Southern Mountain Caribou DPS | A088 | V01 | 1 | Endangered | U.S.A. (wherever found), Canada (southeastern British Columbia) |
| Rangifer tarandus ssp. groenlandicus x pearyi | Dolphin and Union caribou | A0JD | V01 | Foreign | Endangered | Wherever found |
| Ranunculus aestivalis (=acriformis) | Autumn Buttercup | Q212 | P01 | 6 | Endangered | Wherever found |
| Ranunculus hawaiensis | Makou | Q38H | P01 | 1 | Endangered | Wherever found |
| Ranunculus mauiensis | Makou | Q2VQ | P01 | 1 | Endangered | Wherever found |
| Reginaia rotulata | Round Ebonyshell | F02G | I01 | 4 | Endangered | Wherever found |
| Reithrodontomys raviventris | Salt marsh harvest mouse | A03Y | V01 | 8 | Endangered | wherever found |
| Remya kauaiensis | No common name | Q213 | P01 | 1 | Endangered | Wherever found |
| Remya mauiensis | Maui remya | Q214 | P01 | 1 | Endangered | Wherever found |
| Remya montgomeryi | No common name | Q2YH | P01 | 1 | Endangered | Wherever found |
| Rhadine exilis | [no common name] Beetle | I0RF | I01 | 2 | Endangered | Wherever found |
| Rhadine infernalis | [no common name] Beetle | I0P1 | I01 | 2 | Endangered | Wherever found |
| Rhadine persephone | Tooth Cave ground beetle | I0IB | I01 | 2 | Endangered | Wherever found |
| Rhaphiomidas terminatus abdominalis | Delhi Sands flower-loving fly | I0MG | I01 | 8 | Endangered | Wherever found |
| Rhea (=Pterocnemia) pennata | Lesser rhea (incl. Darwin's) | B032 | V01 | Foreign | Endangered | Wherever found |
| Rhinichthys osculus lethoporus | Independence Valley speckled dace | E03E | V01 | 8 | Endangered | Wherever found |
| Rhinichthys osculus nevadensis | Ash Meadows speckled dace | E03A | V01 | 8 | Endangered | Wherever found |
| Rhinichthys osculus oligoporus | Clover Valley speckled dace | E03B | V01 | 8 | Endangered | Wherever found |
| Rhinichthys osculus thermalis | Kendall Warm Springs dace | E00S | V01 | 6 | Endangered | Wherever found |
| Rhinoceros sondaicus | Javan rhinoceros | A024 | V01 | Foreign | Endangered | Sikkim, Thailand, Malaysia, Indonesia, Indochina, Burma, Bangladesh |
| Rhinoceros unicornis | Great Indian rhinoceros | A03M | V01 | Foreign | Endangered | Nepal, India |
| Rhinopithecus avunculus | Tonkin snub-nosed monkey | A0FY | V01 | Foreign | Endangered | Wherever found |
| Rhinopithecus bieti | Yunnan snub-nosed monkey | A0FZ | V01 | Foreign | Endangered | Wherever found |
| Rhinopithecus brelichi | Guizhou snub-nosed monkey | A0FW | V01 | Foreign | Endangered | Wherever found |
| Rhinopithecus roxellana | Sichuan snub-nosed monkey | A0FX | V01 | Foreign | Endangered | Wherever found |
| Rhinoptilus bitorquatus | Jerdon's courser | B0BU | V01 | Foreign | Endangered | Wherever found |
| Rhodiola integrifolia ssp. leedyi | Leedy's roseroot | Q392 | P01 | 3 | Threatened | Wherever found |
| Rhododendron chapmanii | Chapman rhododendron | Q215 | P01 | 4 | Endangered | Entire |
| Rhodonessa caryophyllacea | Pink-headed duck | B04X | V01 | Foreign | Endangered | Wherever found |
| Rhus michauxii | Michaux's sumac | Q2HH | P01 | 4 | Endangered | Wherever found |
| Rhynchopsitta pachyrhyncha | Thick-billed parrot | B00W | V01 | 2 | Endangered | Wherever found |
| Rhynchospora knieskernii | Knieskern's Beaked-rush | Q216 | P01 | 5 | Threatened | Wherever found |
| Rhynochetos jubatus | Kagu | B01V | V01 | Foreign | Endangered | Wherever found |
| Ribes echinellum | Miccosukee gooseberry | Q217 | P01 | 4 | Threatened | Entire |
| Romerolagus diazi | Volcano rabbit | A023 | V01 | Foreign | Endangered | Mexico |
| Rorippa gambellii | Gambel's watercress | Q38L | P01 | 8 | Endangered | Wherever found |
| Rostrhamus sociabilis plumbeus | Everglade snail kite | B00F | V01 | 4 | Endangered | Wherever found |
| Rukia longirostra | Ponape greater white-eye | B03N | V01 | Foreign | Endangered | Wherever found |
| Rupicapra rupicapra ornata | Apennine chamois | A051 | V01 | Foreign | Endangered | Wherever found |
| Sagittaria fasciculata | Bunched arrowhead | Q219 | P01 | 4 | Endangered | Wherever found |
| Sagittaria secundifolia | Kral's water-plantain | Q2VT | P01 | 4 | Threatened | Wherever found |
| Saguinus bicolor | Pied tamarin | A06Y | V01 | Foreign | Endangered | Wherever found |
| Saguinus leucopus | White-footed tamarin | A06Z | V01 | Foreign | Threatened | Wherever found |
| Saguinus oedipus | Cotton-top tamarin | A06Q | V01 | Foreign | Endangered | Wherever found |
| Saiga tatarica mongolica | Mongolian saiga (antelope) | A063 | V01 | Foreign | Endangered | Mongolia |
| Saimiri oerstedii | Red-backed squirrel monkey | A01S | V01 | Foreign | Endangered | Wherever found |
| Salmo platycephalus | Ala balik (trout) | E00I | V01 | Foreign | Endangered | Wherever found |
| Salmo salar | Atlantic salmon | E07L | V03 | 5 | Endangered | Gulf of Maine DPS - See 50 CFR 224.101 |
| Salvelinus confluentus | Bull Trout | E065 | V06 | 1 | Threatened | U.S.A., coterminous, (lower 48 states) |
| Samoana fragilis | Fragile tree snail | G0A7 | I01 | 1 | Endangered | Wherever found |
| Sanicula mariversa | No common name | Q38R | P01 | 1 | Endangered | Wherever found |
| Sanicula purpurea | No common name | Q1MF | P01 | 1 | Endangered | Wherever found |
| Sanicula sandwicensis | No common name | Q2HW | P01 | 1 | Endangered | Wherever found |
| Santalum haleakalae var. lanaiense | Lanai sandalwood (=`iliahi) | Q2HX | P01 | 1 | Endangered | Wherever found |
| Santalum involutum | No common name | Q3OO | P01 | 1 | Endangered | Wherever found |
| Sarracenia oreophila | Green pitcher-plant | Q21B | P01 | 4 | Endangered | Wherever found |
| Sarracenia rubra ssp. alabamensis | Alabama canebrake pitcher-plant | Q2HZ | P01 | 4 | Endangered | Wherever found |
| Sarracenia rubra ssp. jonesii | Mountain sweet pitcher-plant | Q2I0 | P01 | 4 | Endangered | Wherever found |
| Sauromalus varius | San Esteban Island chuckwalla | C02L | V01 | Foreign | Endangered | Wherever found |
| Scaevola coriacea | Dwarf naupaka | Q21C | P01 | 1 | Endangered | Wherever found |
| Scaphirhynchus albus | Pallid sturgeon | E06X | V01 | 6 | Endangered | Wherever found |
| Scaphirhynchus platorynchus | Shovelnose Sturgeon | E0BD | V01 | 6 | Similarity of Appearance to a Threatened Taxon | Wherever found |
| Scaphirhynchus suttkusi | Alabama sturgeon | E026 | V01 | 4 | Endangered | Wherever found |
| Schenkia sebaeoides | Awiwi | Q30Q | P01 | 1 | Endangered | Wherever found |
| Schiedea adamantis | Diamond Head schiedea | Q21E | P01 | 1 | Endangered | Wherever found |
| Schiedea apokremnos | Ma`oli`oli | Q2VV | P01 | 1 | Endangered | Wherever found |
| Schiedea attenuata | No common name | Q3H7 | P01 | 1 | Endangered | Wherever found |
| Schiedea diffusa ssp. macraei | No common name | Q3OE | P01 | 1 | Endangered | Wherever found |
| Schiedea diffusa subsp. diffusa | No common name | Q3OS | P01 | 1 | Endangered | Wherever found |
| Schiedea haleakalensis | No common name | Q2VW | P01 | 1 | Endangered | Wherever found |
| Schiedea hawaiiensis | Ma`oli`oli | Q1MU | P01 | 1 | Endangered | Wherever found |
| Schiedea helleri | No common name | Q2VX | P01 | 1 | Endangered | Wherever found |
| Schiedea hookeri | No common name | Q1MV | P01 | 1 | Endangered | Wherever found |
| Schiedea jacobii | No common name | Q3O2 | P01 | 1 | Endangered | Wherever found |
| Schiedea kaalae | No common name | Q21F | P01 | 1 | Endangered | Wherever found |
| Schiedea kauaiensis | No common name | Q38U | P01 | 1 | Endangered | Wherever found |
| Schiedea kealiae | Ma`oli`oli | Q1MW | P01 | 1 | Endangered | Wherever found |
| Schiedea laui | No common name | Q3O3 | P01 | 1 | Endangered | Wherever found |
| Schiedea lychnoides | Kuawawaenohu | Q2YL | P01 | 1 | Endangered | Wherever found |
| Schiedea lydgatei | No common name | Q2VY | P01 | 1 | Endangered | Wherever found |
| Schiedea membranacea | No common name | Q1MY | P01 | 1 | Endangered | Wherever found |
| Schiedea nuttallii | No common name | Q38V | P01 | 1 | Endangered | Wherever found |
| Schiedea obovata | No common name | Q1SQ | P01 | 1 | Endangered | Wherever found |
| Schiedea pubescens | Ma`oli`oli | Q2VZ | P01 | 1 | Endangered | Wherever found |
| Schiedea salicaria | No common name | Q21G | P01 | 1 | Endangered | Wherever found |
| Schiedea sarmentosa | No common name | Q1N2 | P01 | 1 | Endangered | Wherever found |
| Schiedea spergulina var. leiopoda | No common name | Q2W0 | P01 | 1 | Endangered | Wherever found |
| Schiedea spergulina var. spergulina | No common name | Q2W1 | P01 | 1 | Threatened | Wherever found |
| Schiedea stellarioides | Laulihilihi | Q2W2 | P01 | 1 | Endangered | Wherever found |
| Schiedea trinervis | No common name | Q1SR | P01 | 1 | Endangered | Wherever found |
| Schiedea verticillata | No common name | Q1N3 | P01 | 1 | Endangered | Wherever found |
| Schiedea viscosa | No common name | Q2X3 | P01 | 1 | Endangered | Wherever found |
| Schoenocrambe argillacea | Clay reed-mustard | Q38X | P01 | 6 | Threatened | Wherever found |
| Schoenocrambe barnebyi | Barneby reed-mustard | Q2QU | P01 | 6 | Endangered | Wherever found |
| Schoenocrambe suffrutescens | Shrubby reed-mustard | Q1N9 | P01 | 6 | Endangered | Wherever found |
| Schoepfia arenaria | No common name | Q2W3 | P01 | 4 | Threatened | Wherever found |
| Schwalbea americana | American chaffseed | Q2I4 | P01 | 4 | Endangered | Wherever found |
| Scirpus ancistrochaetus | Northeastern bulrush | Q21H | P01 | 5 | Endangered | Entire |
| Sclerocactus brevihamatus ssp. tobuschii | Tobusch fishhook cactus | Q1SV | P01 | 2 | Threatened | Wherever found |
| Sclerocactus brevispinus | Pariette cactus | Q3KI | P01 | 6 | Threatened | Wherever found |
| Sclerocactus glaucus | Colorado hookless Cactus | Q21I | P01 | 6 | Threatened | Wherever found |
| Sclerocactus mariposensis | Lloyd''s Mariposa cactus | Q1W2 | P01 | 2 | Threatened | Wherever found |
| Sclerocactus mesae-verdae | Mesa Verde cactus | Q21J | P01 | 2 | Threatened | Wherever found |
| Sclerocactus wetlandicus | Uinta Basin hookless cactus | Q3N6 | P01 | 6 | Threatened | Wherever found |
| Sclerocactus wrightiae | Wright fishhook cactus | Q21K | P01 | 6 | Endangered | Wherever found |
| Scleropages formosus | Asian bonytongue | E01U | V01 | Foreign | Endangered | Wherever found |
| Scutellaria floridana | Florida skullcap | Q2I9 | P01 | 4 | Threatened | Entire |
| Scutellaria montana | Large-flowered skullcap | Q2IA | P01 | 4 | Threatened | Wherever found |
| Sebastes paucispinis | Bocaccio | E0BI | V01 | NMFS | Endangered | Puget Sound-Georgia Basin DPS See 50 CFR 224.101 |
| Sebastes pinniger | canary rockfish | E0BK | V01 | NMFS | Threatened | Puget Sound - Georgia Basin DPS See 50 CFR 223.102 |
| Sebastes ruberrimus | yelloweye rockfish | E0BM | V01 | NMFS | Threatened | Puget Sound - Georgia Basin DPS See 50 CFR 223.102 |
| Semnopithecus (=Presbytis) entellus | Gray (=entellus) langur | A05M | V01 | Foreign | Endangered | Wherever found |
| Senecio layneae | Layne's butterweed | Q1O2 | P01 | 8 | Threatened | Wherever found |
| Serianthes nelsonii | Hayun Iagu (=(Guam), Tronkon guafi (Rota)) | Q2QW | P01 | 1 | Endangered | Wherever found |
| Seriatopora aculeata | No common name | P00I | I01 | NMFS | Threatened | Wherever found |
| Sesbania tomentosa | Ohai | Q2IM | P01 | 1 | Endangered | Wherever found |
| Setonix brachyurus | Quokka | A04B | V01 | Foreign | Endangered | Wherever found |
| Setophaga angelae | Elfin-woods warbler | B07V | V01 | 4 | Threatened | Wherever found |
| Setophaga chrysoparia | golden-cheeked warbler | B07W | V01 | 2 | Endangered | Wherever found |
| Sibara filifolia | Santa Cruz Island rockcress | Q1OF | P01 | 8 | Endangered | Wherever found |
| Sicyos albus | `Anunu | Q393 | P01 | 1 | Endangered | Wherever found |
| Sicyos lanceoloideus | No common name | Q3OQ | P01 | 1 | Endangered | Wherever found |
| Sicyos macrophyllus | `Anunu | Q396 | P01 | 1 | Endangered | Wherever found |
| Sidalcea keckii | Keck's Checker-mallow | Q1OS | P01 | 8 | Endangered | Wherever found |
| Sidalcea oregana ssp. valida | Kenwood Marsh checker-mallow | Q1OU | P01 | 8 | Endangered | Wherever found |
| Sidalcea oregana var. calva | Wenatchee Mountains checkermallow | Q1OT | P01 | 1 | Endangered | Wherever found |
| Sidalcea pedata | Pedate checker-mallow | Q2IS | P01 | 8 | Endangered | Wherever found |
| Sideroxylon reclinatum ssp. austrofloridense | Everglades bully | Q3IM | P01 | 4 | Threatened | Entire |
| Silene alexandri | No common name | Q21N | P01 | 1 | Endangered | Wherever found |
| Silene hawaiiensis | No common name | Q2IX | P01 | 1 | Threatened | Wherever found |
| Silene lanceolata | No common name | Q21O | P01 | 1 | Endangered | Wherever found |
| Silene perlmanii | No common name | Q39A | P01 | 1 | Endangered | Wherever found |
| Silene polypetala | Fringed campion | Q21P | P01 | 4 | Endangered | Wherever found |
| Silene spaldingii | Spalding's Catchfly | Q1P9 | P01 | 1 | Threatened | Wherever found |
| Sistrurus catenatus | Eastern Massasauga (=rattlesnake) | C03P | V01 | 3 | Threatened | Wherever found |
| Sisyrinchium dichotomum | White irisette | Q39D | P01 | 4 | Endangered | Wherever found |
| Sitta ledanti | Algerian nuthatch | B09V | V01 | Foreign | Endangered | Wherever found |
| Sminthopsis longicaudata | Long-tailed marsupial-mouse | A036 | V01 | Foreign | Endangered | Wherever found |
| Sminthopsis psammophila | Large desert marsupial-mouse | A035 | V01 | Foreign | Endangered | Wherever found |
| Solanum conocarpum | Marron bacora | Q1PL | P01 | 4 | Endangered | Entire |
| Solanum drymophilum | Erubia | Q2J3 | P01 | 4 | Endangered | Wherever found |
| Solanum guamense | Berenghenas halomtano | Q3P1 | P01 | 1 | Endangered | Wherever found |
| Solanum incompletum | Popolo ku mai | Q21Q | P01 | 1 | Endangered | Wherever found |
| Solanum nelsonii | Popolo | Q21R | P01 | 1 | Endangered | Wherever found |
| Solanum sandwicense | `Aiakeakua, popolo | Q21S | P01 | 1 | Endangered | Wherever found |
| Solenodon cubanus | Cuban solenodon | A02D | V01 | Foreign | Endangered | Wherever found |
| Solenodon paradoxus | Haitian solenodon | A02E | V01 | Foreign | Endangered | Wherever found |
| Solidago houghtonii | Houghton's goldenrod | Q2J5 | P01 | 3 | Threatened | Wherever found |
| Solidago shortii | Short's goldenrod | Q21U | P01 | 4 | Endangered | Wherever found |
| Solidago spithamaea | Blue Ridge goldenrod | Q2J7 | P01 | 4 | Threatened | Wherever found |
| Somateria fischeri | Spectacled eider | B08Z | V01 | 7 | Threatened | Wherever found |
| Somatochlora hineana | Hine's emerald dragonfly | I06P | I01 | 3 | Endangered | Wherever found |
| Sorex ornatus relictus | Buena Vista Lake ornate Shrew | A0DV | V01 | 8 | Endangered | Wherever found |
| Spelaeorchestia koloana | Kauai cave amphipod | K022 | I01 | 1 | Endangered | Wherever found |
| Speoplatyrhinus poulsoni | Alabama cavefish | E011 | V01 | 4 | Endangered | Wherever found |
| Spermolepis hawaiiensis | No common name | Q39H | P01 | 1 | Endangered | Wherever found |
| Speyeria callippe callippe | Callippe silverspot butterfly | I019 | I01 | 8 | Endangered | Wherever found |
| Speyeria nokomis nokomis | Silverspot | I010 | I01 | 6 | Threatened | Wherever found |
| Speyeria zerene behrensii | Behren's silverspot butterfly | I031 | I01 | 8 | Endangered | Wherever found |
| Speyeria zerene hippolyta | Oregon silverspot butterfly | I01A | I01 | 1 | Threatened | Wherever found |
| Speyeria zerene myrtleae | Myrtle's silverspot butterfly | I00N | I01 | 8 | Endangered | Wherever found |
| Sphaeralcea gierischii | Gierisch mallow | Q3LJ | P01 | 2 | Endangered | Wherever found |
| Spheniscus demersus | African penguin | B0FM | V01 | Foreign | Endangered | Wherever found |
| Spheniscus humboldti | Humboldt penguin | B0FN | V01 | Foreign | Threatened | Wherever found |
| Spheniscus mendiculus | Galapagos penguin | B02M | V01 | Foreign | Endangered | Wherever found |
| Sphenodon guntheri | Brother's Island tuatara | C00N | V01 | Foreign | Endangered | Wherever found |
| Sphenodon punctatus | Tuatara | C00L | V01 | Foreign | Endangered | Wherever found |
| Sphyrna lewini | Scalloped Hammerhead Shark | E0CL | V02 | NMFS | Endangered | Eastern Pacific DPS |
| Sphyrna lewini | Scalloped Hammerhead Shark | E0CL | V03 | NMFS | Threatened | Central and Southwest Atlantic DPS |
| Sphyrna lewini | Scalloped Hammerhead Shark | E0CL | V04 | NMFS | Endangered | Eastern Atlantic DPS |
| Sphyrna lewini | Scalloped Hammerhead Shark | E0CL | V05 | NMFS | Threatened | Indo-West Pacific DPS |
| Spigelia gentianoides | Gentian pinkroot | Q21W | P01 | 4 | Endangered | Entire |
| Spiraea virginiana | Virginia spiraea | Q2R1 | P01 | 5 | Threatened | Wherever found |
| Spiranthes delitescens | Canelo Hills ladies'-tresses | Q3FS | P01 | 2 | Endangered | Wherever found |
| Spiranthes diluvialis | Ute ladies'-tresses | Q2WA | P01 | 6 | Threatened | Wherever found |
| Spiranthes parksii | Navasota ladies-tresses | Q21X | P01 | 2 | Endangered | Wherever found |
| Squatina squatina | Angel shark | E0DD | V01 | NMFS | Endangered | Entire |
| Stahlia monosperma | Cobana negra | Q2JA | P01 | 4 | Threatened | Wherever found |
| Stenogyne angustifolia var. angustifolia | No common name | Q21Z | P01 | 1 | Endangered | Wherever found |
| Stenogyne bifida | No common name | Q39K | P01 | 1 | Endangered | Wherever found |
| Stenogyne campanulata | No common name | Q39L | P01 | 1 | Endangered | Wherever found |
| Stenogyne cranwelliae | No common name | Q39M | P01 | 1 | Endangered | Wherever found |
| Stenogyne kaalae ssp. sherffii | No common name | Q1QY | P01 | 1 | Endangered | Wherever found |
| Stenogyne kanehoana | No common name | Q220 | P01 | 1 | Endangered | Wherever found |
| Stenogyne kauaulaensis | No common name | Q3O4 | P01 | 1 | Endangered | Wherever found |
| Stenogyne kealiae | No common name | Q3H8 | P01 | 1 | Endangered | Wherever found |
| Stephanomeria malheurensis | Malheur wire-lettuce | Q221 | P01 | 1 | Endangered | Wherever found |
| Sterna dougallii dougallii | Roseate tern | B07O | V01 | 5 | Endangered | U.S.A. (Atlantic Coast south to NC), Canada (Newf., N.S, Que.), Bermuda |
| Sterna dougallii dougallii | Roseate tern | B07O | V02 | 4 | Threatened | Western Hemisphere and adjacent oceans, incl. U.S.A. (FL, PR, VI), where not listed as endangered |
| Sternotherus depressus | Flattened musk turtle | C01Y | V01 | 4 | Threatened | Black Warrior R. system upstream from Bankhead Dam |
| Sternula antillarum browni | California least tern | B03X | V01 | 8 | Endangered | Wherever found |
| Streptanthus albidus ssp. albidus | Metcalf Canyon jewelflower | Q222 | P01 | 8 | Endangered | Wherever found |
| Streptanthus bracteatus | Bracted twistflower | Q1R7 | P01 | 2 | Threatened | Wherever found |
| Streptanthus niger | Tiburon jewelflower | Q223 | P01 | 8 | Endangered | Wherever found |
| Streptocephalus woottoni | Riverside fairy shrimp | K03F | I01 | 8 | Endangered | Wherever found |
| Streptopelia picturata rostrata | Seychelles turtle dove | B0A7 | V01 | Foreign | Endangered | Wherever found |
| Strigops habroptilus | Kakapo | B01W | V01 | Foreign | Endangered | Wherever found |
| Strix occidentalis caurina | Northern spotted owl | B08B | V01 | 1 | Threatened | Wherever found |
| Strix occidentalis lucida | Mexican spotted owl | B074 | V01 | 2 | Threatened | Wherever found |
| Struthio camelus spatzi | West African ostrich | B025 | V01 | Foreign | Endangered | Wherever found |
| Struthio camelus syriacus | Arabian ostrich | B024 | V01 | Foreign | Endangered | Wherever found |
| Strymon acis bartrami | Bartram's hairstreak Butterfly | I07G | I01 | 4 | Endangered | Wherever found |
| Stygobromus hayi | Hay's Spring amphipod | K004 | I01 | 5 | Endangered | Wherever found |
| Stygobromus (=Stygonectes) pecki | Peck's cave amphipod | K019 | I01 | 2 | Endangered | Wherever found |
| Stygoparnus comalensis | Comal Springs dryopid beetle | I0MI | I01 | 2 | Endangered | Wherever found |
| Styrax platanifolius ssp. texanus | Texas snowbells | Q224 | P01 | 2 | Endangered | Wherever found |
| Styrax portoricensis | Palo de jazmin | Q2R6 | P01 | 4 | Endangered | Wherever found |
| Suaeda californica | California seablite | Q3AF | P01 | 8 | Endangered | Entire |
| Sus salvanius | Pygmy hog | A019 | V01 | Foreign | Endangered | Wherever found |
| Swallenia alexandrae | Eureka Dune grass | Q225 | P01 | 8 | Threatened | Entire |
| Sylvilagus bachmani riparius | Riparian brush rabbit | A0DN | V01 | 8 | Endangered | Wherever found |
| Sylvilagus palustris hefneri | Lower Keys marsh rabbit | A0AA | V01 | 4 | Endangered | Wherever found |
| Symphalangus syndactylus | Siamang | A066 | V01 | Foreign | Endangered | Wherever found |
| Syncaris pacifica | California freshwater shrimp | K01W | I01 | 8 | Endangered | Wherever found |
| Syrmaticus ellioti | Elliot's pheasant | B05G | V01 | Foreign | Endangered | Wherever found |
| Syrmaticus humaie | Bar-tailed pheasant | B02N | V01 | Foreign | Endangered | Wherever found |
| Syrmaticus mikado | Mikado pheasant | B02T | V01 | Foreign | Endangered | Wherever found |
| Tabernaemontana rotensis | No common name | Q3H0 | P01 | 1 | Threatened | Wherever found |
| Tachybaptus rufolavatus | Alaotra Grebe | B09R | V01 | Foreign | Endangered | Wherever found |
| Tamiasciurus fremonti grahamensis | Mount Graham red squirrel | A09O | V01 | 2 | Endangered | Wherever found |
| Tanakia tanago | Miyako tango (=Toyko bitterling) | E00P | V01 | Foreign | Endangered | Wherever found |
| Tapirus bairdii | Central American tapir | A02H | V01 | Foreign | Endangered | Wherever found |
| Tapirus indicus | Asian tapir | A068 | V01 | Foreign | Endangered | Wherever found |
| Tapirus pinchaque | Mountain tapir | A02I | V01 | Foreign | Endangered | Wherever found |
| Tapirus terrestris | South American (=Brazilian) tapir | A02G | V01 | Foreign | Endangered | Wherever found |
| Taraxacum californicum | California taraxacum | Q1SB | P01 | 8 | Endangered | Wherever found |
| Tarsius syrichta | Philippine tarsier | A070 | V01 | Foreign | Threatened | Wherever found |
| Tartarocreagris texana | Tooth Cave pseudoscorpion | J00A | I01 | 2 | Endangered | Wherever found |
| Tauraco bannermani | Bannerman's turaco | B0A6 | V01 | Foreign | Endangered | Wherever found |
| Taurotragus derbianus derbianus | Western giant eland | A07J | V01 | Foreign | Endangered | Wherever found |
| Taylorconcha serpenticola | Bliss Rapids snail | G01K | I01 | 1 | Threatened | Wherever found |
| Tayshaneta microps | Government Canyon Bat Cave spider | J018 | I01 | 2 | Endangered | Wherever found |
| Tayshaneta myopica | Tooth Cave spider | J00B | I01 | 2 | Endangered | Wherever found |
| Tectaria estremerana | No common name | S01W | P01 | 4 | Endangered | Wherever found |
| Telespiza cantans | Laysan finch | B009 | V01 | 1 | Endangered | Wherever found |
| Telespiza ultima | Nihoa finch | B00A | V01 | 1 | Endangered | Wherever found |
| Ternstroemia luquillensis | Palo colorado | Q2JL | P01 | 4 | Endangered | Wherever found |
| Ternstroemia subsessilis | No common name | Q2JM | P01 | 4 | Endangered | Wherever found |
| Terpsiphone corvina | Seychelles paradise flycatcher | B01K | V01 | Foreign | Endangered | Wherever found |
| Terrapene coahuila | Aquatic box turtle | C00R | V01 | Foreign | Endangered | Wherever found |
| Testudo kleinmanni | Egyptian Tortoise | C07S | V01 | Foreign | Threatened | Wherever found |
| Tetramolopium arenarium | No common name | Q226 | P01 | 1 | Endangered | Wherever found |
| Tetramolopium capillare | Pamakani | Q227 | P01 | 1 | Endangered | Wherever found |
| Tetramolopium filiforme | No common name | Q228 | P01 | 1 | Endangered | Wherever found |
| Tetramolopium lepidotum ssp. lepidotum | No common name | Q229 | P01 | 1 | Endangered | Wherever found |
| Tetramolopium remyi | No common name | Q22A | P01 | 1 | Endangered | Wherever found |
| Tetramolopium rockii | No common name | Q22B | P01 | 1 | Threatened | Wherever found |
| Tetrao urogallus cantabricus | Cantabrian capercaillie | B0CM | V01 | Foreign | Endangered | Wherever found |
| Texamaurops reddelli | Kretschmarr Cave mold beetle | I0IA | I01 | 2 | Endangered | Wherever found |
| Texella cokendolpheri | Cokendolpher Cave Harvestman | J016 | I01 | 2 | Endangered | Wherever found |
| Texella reddelli | Bee Creek Cave harvestman | J008 | I01 | 2 | Endangered | Wherever found |
| Texella reyesi | Bone Cave harvestman | J009 | I01 | 2 | Endangered | Wherever found |
| Thaleichthys pacificus | Eulachon | E0BJ | V01 | NMFS | Threatened | Southern DPS - See 50 CFR 223.102 |
| Thalictrum cooleyi | Cooley's meadowrue | Q231 | P01 | 4 | Endangered | Wherever found |
| Thamnophis eques megalops | Northern Mexican gartersnake | C04Q | V01 | 2 | Threatened | Wherever found |
| Thamnophis gigas | Giant garter snake | C057 | V01 | 8 | Threatened | Wherever found |
| Thamnophis rufipunctatus | Narrow-headed gartersnake | C051 | V01 | 2 | Threatened | Wherever found |
| Thamnophis sirtalis tetrataenia | San Francisco garter snake | C002 | V01 | 8 | Endangered | Wherever found |
| Theliderma intermedia | Cumberland monkeyface (pearlymussel) | F00E | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Theliderma sparsa | Appalachian monkeyface (pearlymussel) | F00D | I01 | 5 | Endangered | Wherever found |
| Thelypodium howellii ssp. spectabilis | Howell''s spectacular thelypody | Q2K9 | P01 | 1 | Threatened | Wherever found |
| Thelypodium stenopetalum | Slender-petaled mustard | Q2KB | P01 | 8 | Endangered | Wherever found |
| Thelypteris inabonensis | No common name | S01Y | P01 | 4 | Endangered | Wherever found |
| Thelypteris pilosa var. alabamensis | Alabama streak-sorus fern | S01N | P01 | 4 | Threatened | Wherever found |
| Thelypteris verecunda | No common name | S01Z | P01 | 4 | Endangered | Wherever found |
| Thelypteris yaucoensis | No common name | S020 | P01 | 4 | Endangered | Wherever found |
| Thermosphaeroma thermophilus | Socorro isopod | K01Y | I01 | 2 | Endangered | Wherever found |
| Theropithecus gelada | Gelada baboon | A06B | V01 | Foreign | Threatened | Wherever found |
| Thinornis novaeseelandiae | New Zealand shore plover | B030 | V01 | Foreign | Endangered | Wherever found |
| Thlaspi californicum | Kneeland Prairie penny-cress | Q2KF | P01 | 8 | Endangered | Wherever found |
| Thomomys mazama glacialis | Roy Prairie pocket gopher | A0CP | V01 | 1 | Threatened | Wherever found |
| Thomomys mazama pugetensis | Olympia pocket gopher | A0IE | V01 | 1 | Threatened | Wherever found |
| Thomomys mazama tumuli | Tenino pocket gopher | A0IF | V01 | 1 | Threatened | Wherever found |
| Thomomys mazama yelmensis | Yelm pocket gopher | A0IG | V01 | 1 | Threatened | Wherever found |
| Thylacinus cynocephalus | Tasmanian tiger | A02J | V01 | Foreign | Endangered | Wherever found |
| Thymophylla tephroleuca | Ashy dogweed | Q1SH | P01 | 2 | Endangered | Wherever found |
| Thysanocarpus conchuliferus | Santa Cruz Island fringepod | Q2KH | P01 | 8 | Endangered | Wherever found |
| Tiaroga cobitis | Loach minnow | E03X | V01 | 2 | Endangered | Wherever found |
| Tinamus solitarius | Solitary tinamou | B05P | V01 | Foreign | Endangered | Wherever found |
| Tinospora homosepala | No common name | Q3SH | P01 | 1 | Endangered | Wherever found |
| Todiramphus cinnamominus | Guam kingfisher | B061 | V01 | 1 | Endangered | Wherever found |
| Tomistoma schlegelii | Tomistoma | C01B | V01 | Foreign | Endangered | Wherever found |
| Torreya taxifolia | Florida torreya | R006 | P01 | 4 | Endangered | Entire |
| Townsendia aprica | Last Chance townsendia | Q234 | P01 | 6 | Threatened | Wherever found |
| Toxolasma cylindrellus | Pale lilliput (pearlymussel) | F00B | I01 | 4 | Endangered | Wherever found |
| Trachemys scripta callirostris | South American red-lined turtle | C04J | V01 | Foreign | Endangered | Wherever found |
| Trachemys stejnegeri malonei | Inagua Island turtle | C04I | V01 | Foreign | Endangered | Wherever found |
| Trachemys terrapen | Cat Island turtle | C04G | V01 | Foreign | Endangered | Cat Island in the Bahamas |
| Trachypithecus (=Presbytis) francoisi | Francois' langur | A06G | V01 | Foreign | Endangered | Wherever found |
| Trachypithecus (=Presbytis) geei | Golden langur | A05N | V01 | Foreign | Endangered | Wherever found |
| Trachypithecus (=Presbytis) pileatus | Capped Langur | A05L | V01 | Foreign | Endangered | Wherever found |
| Tragopan blythii | Blyth's tragopan pheasant | B02O | V01 | Foreign | Endangered | Wherever found |
| Tragopan caboti | Cabot's tragopan pheasant | B02Q | V01 | Foreign | Endangered | Wherever found |
| Tragopan melanocephalus | Western tragopan pheasant | B02X | V01 | Foreign | Endangered | Wherever found |
| Trematolobelia singularis | No common name | Q3A0 | P01 | 1 | Endangered | Wherever found |
| Trichechus inunguis | Amazonian manatee | A01O | V01 | Foreign | Endangered | Wherever found |
| Trichechus manatus | West Indian Manatee | A007 | V01 | 4 | Threatened | Wherever found |
| Trichechus senegalensis | West African manatee | A07V | V01 | Foreign | Threatened | Wherever found |
| Trichilia triacantha | Bariaco | Q2KU | P01 | 4 | Endangered | Wherever found |
| Trichocichla rufa | Long-legged warbler | B0D9 | V01 | Foreign | Endangered | Wherever found |
| Trichomanes punctatum ssp. floridanum | Florida bristle fern | S02G | P01 | 4 | Endangered | Entire |
| Trifolium amoenum | Showy Indian clover | Q238 | P01 | 8 | Endangered | Wherever found |
| Trifolium trichocalyx | Monterey clover | Q23C | P01 | 8 | Endangered | Wherever found |
| Trillium persistens | Persistent trillium | Q23D | P01 | 4 | Endangered | Wherever found |
| Trillium reliquum | Relict trillium | Q2RG | P01 | 4 | Endangered | Wherever found |
| Trimerotropis infantilis | Zayante band-winged grasshopper | I0OY | I01 | 8 | Endangered | Wherever found |
| Tringa guttifer | Nordmann's greenshank | B052 | V01 | Foreign | Endangered | Wherever found |
| Triodopsis platysayoides | Flat-spired three-toothed Snail | G00S | I01 | 5 | Threatened | Wherever found |
| Trionyx ater | Cuatro Cienegas softshell turtle | C01F | V01 | Foreign | Endangered | Wherever found |
| Trionyx gangeticus | Indian softshell turtle | C01I | V01 | Foreign | Endangered | Wherever found |
| Trionyx hurum | Peacock softshell turtle | C01J | V01 | Foreign | Endangered | Wherever found |
| Trionyx nigricans | Black softshell turtle | C01D | V01 | Foreign | Endangered | Wherever found |
| Troglodytes aedon guadeloupensis | Guadeloupe house wren | B03S | V01 | Foreign | Endangered | Wherever found |
| Troglodytes aedon mesoleucus | St. Lucia house wren | B03T | V01 | Foreign | Endangered | Wherever found |
| Troides alexandrae | Queen Alexandra's birdwing butterfly | I0ME | I01 | Foreign | Endangered | Wherever found |
| Tryonia alamosae | Alamosa springsnail | G03Q | I01 | 2 | Endangered | Wherever found |
| Tryonia cheatumi | Phantom Tryonia | G013 | I01 | 2 | Endangered | Wherever found |
| Tryonia circumstriata (=stocktonensis) | Gonzales tryonia | G05D | I01 | 2 | Endangered | Wherever found |
| Tubastraea floreana | No common name | P022 | I01 | NMFS | Endangered | Entire |
| Tuberolabium guamense | No common name | Q3P3 | P01 | 1 | Threatened | Wherever found |
| Tuctoria greenei | Greene's tuctoria | Q23K | P01 | 8 | Endangered | Wherever found |
| Tuctoria mucronata | Solano grass | Q23L | P01 | 8 | Endangered | Wherever found |
| Tulotoma magnifica | Tulotoma snail | G04X | I01 | 4 | Threatened | Wherever found |
| Turdus olivaceus helleri | Taita thrush | B0A5 | V01 | Foreign | Endangered | Wherever found |
| Turnagra capensis | New Zealand thrush (wattlebird) | B03E | V01 | Foreign | Endangered | Wherever found |
| Tympanuchus cupido attwateri | Attwater's greater prairie-chicken | B00O | V01 | 2 | Endangered | Wherever found |
| Tympanuchus pallidicinctus | Lesser prairie-chicken | B0AZ | V02 | 2 | Threatened | Northern DPS: All lesser prairie-chickens north of a line starting at 37.9868 N, 105.0133 W, and ending at 31.7351 N, 98.3773 W, NAD83 |
| Tympanuchus pallidicinctus | Lesser prairie-chicken | B0AZ | V03 | 2 | Endangered | Southern DPS: All lesser prairie-chickens south of a line starting at 37.9868 N, 105.0133 W, and ending at 31.7351 N, 98.3773 W, NAD83 |
| Tyto soumagnei | Madagascar red owl | B06D | V01 | Foreign | Endangered | Wherever found |
| Uma inornata | Coachella Valley fringe-toed lizard | C02I | V01 | 8 | Threatened | Wherever found |
| Uncia (=Panthera) uncia | Snow leopard | A041 | V01 | Foreign | Endangered | Wherever found |
| Uratelornis chimaera | Long-tailed ground roller | B037 | V01 | Foreign | Endangered | Wherever found |
| Urera kaalae | Opuhe | Q23M | P01 | 1 | Endangered | Wherever found |
| Urocitellus brunneus | Northern Idaho Ground Squirrel | A0EK | V01 | 1 | Threatened | Wherever found |
| Urocyon littoralis catalinae | Santa Catalina Island Fox | A08K | V01 | 8 | Threatened | Wherever found |
| Ursus arctos arctos | Brown bear | A04P | V01 | Foreign | Endangered | Italy |
| Ursus arctos horribilis | Grizzly bear | A001 | V01 | 6 | Threatened | U.S.A., conterminous (lower 48) States, except where listed as an experimental population |
| Ursus arctos pruinosus | Brown bear | A04Q | V01 | Foreign | Endangered | Wherever found |
| Ursus maritimus | Polar bear | A0IJ | V01 | 7 | Threatened | Wherever found |
| Ursus thibetanus gedrosianus | Baluchistan bear | A0FG | V01 | Foreign | Endangered | Wherever found |
| Vagrans egistina | Mariana wandering butterfly | I0R8 | I01 | 1 | Endangered | Wherever found |
| Varanus bengalensis | Indian (=Bengal) monitor | C017 | V01 | Foreign | Endangered | Wherever found |
| Varanus flavescens | Yellow monitor | C019 | V01 | Foreign | Endangered | Wherever found |
| Varanus griseus | Desert monitor | C016 | V01 | Foreign | Endangered | Wherever found |
| Varanus komodoensis | Komodo Island monitor | C018 | V01 | Foreign | Endangered | Wherever found |
| Varronia rupicola | No common name | Q0GP | P01 | 4 | Threatened | Wherever found |
| Verbena californica | Red Hills vervain | Q2LO | P01 | 8 | Threatened | Wherever found |
| Verbesina dissita | Big-leaved crownbeard | Q3GB | P01 | 8 | Threatened | Wherever found |
| Vernonia proctorii | No common name | Q3A6 | P01 | 4 | Endangered | Wherever found |
| Vetericaris chaceorum | Anchialine pool shrimp | K03C | I01 | 1 | Endangered | Wherever found |
| Vicia menziesii | Hawaiian vetch | Q23Q | P01 | 1 | Endangered | Wherever found |
| Vicugna vicugna | Vicuna | A02L | V01 | Foreign | Endangered | Ecuador (DPS) |
| Vicugna vicugna | Vicuna | A02L | V02 | Foreign | Threatened | Entire, except Ecuador |
| Vigna o-wahuensis | No common name | Q23R | P01 | 1 | Endangered | Wherever found |
| Villosa fabalis | Rayed Bean | F01A | I01 | 3 | Endangered | Wherever found |
| Villosa perpurpurea | Purple bean | F001 | I01 | 5 | Endangered | Wherever found |
| Villosa trabalis | Cumberland bean (pearlymussel) | F000 | I01 | 4 | Endangered | Wherever found; Except where listed as Experimental Populations |
| Viola chamissoniana ssp. chamissoniana | Pamakani | Q23S | P01 | 1 | Endangered | Wherever found |
| Viola helenae | No common name | Q23T | P01 | 1 | Endangered | Wherever found |
| Viola kauaiensis var. wahiawaensis | Nani wai`ale`ale | Q23U | P01 | 1 | Endangered | Wherever found |
| Viola lanaiensis | No common name | Q23V | P01 | 1 | Endangered | Wherever found |
| Viola oahuensis | No common name | Q23W | P01 | 1 | Endangered | Wherever found |
| Vipera latifii | Lar Valley viper | C037 | V01 | Foreign | Endangered | Wherever found |
| Vireo bellii pusillus | Least Bell's vireo | B067 | V01 | 8 | Endangered | Wherever found |
| Viverra civettina (=megaspila c.) | Malabar large-spotted civet | A07A | V01 | Foreign | Endangered | Wherever found |
| Vulpes macrotis mutica | San Joaquin kit fox | A006 | V01 | 8 | Endangered | wherever found |
| Vulpes velox hebes | Northern swift fox | A010 | V01 | Foreign | Endangered | Canada |
| Vulpes vulpes necator | Sierra Nevada red fox | A0AY | V02 | 8 | Endangered | Sierra Nevada DPS |
| Vultur gryphus | Andean condor | B03Y | V01 | Foreign | Endangered | Wherever found |
| Warea amplexifolia | Wide-leaf warea | Q2M9 | P01 | 4 | Endangered | Entire |
| Warea carteri | Carter's mustard | Q2MA | P01 | 4 | Endangered | Entire |
| Wikstroemia skottsbergiana | No common name | Q243 | P01 | 1 | Endangered | Entire |
| Wikstroemia villosa | No common name | Q244 | P01 | 1 | Endangered | Wherever found |
| Wilkesia hobdyi | Dwarf iliau | Q245 | P01 | 1 | Endangered | Wherever found |
| Wyulda squamicaudata | Scaly-tailed possum | A03G | V01 | Foreign | Endangered | Wherever found |
| Xenicus longipes | New Zealand bushwren | B013 | V01 | Foreign | Endangered | Wherever found |
| Xenopirostris damii | Van Dam's vanga | B0A9 | V01 | Foreign | Threatened | Wherever found |
| Xenopirostris polleni | Pollen's vanga | B0A8 | V01 | Foreign | Threatened | Wherever found |
| Xeromys myoides | False water rat | A03H | V01 | Foreign | Endangered | Wherever found |
| Xipholena atropurpurea | White-winged cotinga | B04S | V01 | Foreign | Endangered | Wherever found |
| Xylosma crenatum | No common name | Q2MK | P01 | 1 | Endangered | Wherever found |
| Xyrauchen texanus | Razorback sucker | E054 | V01 | 6 | Endangered | Wherever found |
| Xyris tennesseensis | Tennessee yellow-eyed grass | Q2MP | P01 | 4 | Endangered | Wherever found |
| Yermo xanthocephalus | Desert yellowhead | Q3GI | P01 | 6 | Threatened | Wherever found |
| Zanthoxylum dipetalum var. tomentosum | A`e | Q3A7 | P01 | 1 | Endangered | Wherever found |
| Zanthoxylum hawaiiense | A`e | Q246 | P01 | 1 | Endangered | Wherever found |
| Zanthoxylum oahuense | A`e | Q3H9 | P01 | 1 | Endangered | Wherever found |
| Zanthoxylum thomasianum | St. Thomas prickly-ash | Q2MX | P01 | 4 | Endangered | Wherever found |
| Zapada glacier | Western glacier stonefly | I0VZ | I01 | 6 | Threatened | Wherever found |
| Zapus hudsonius luteus | New Mexico meadow jumping mouse | A0BX | V01 | 2 | Endangered | Wherever found |
| Zapus hudsonius preblei | Preble's meadow jumping mouse | A0C2 | V01 | 6 | Threatened | wherever found |
| Zizania texana | Texas wild-rice | Q24A | P01 | 2 | Endangered | Wherever found |
| Ziziphus celata | Florida ziziphus | Q2WX | P01 | 4 | Endangered | Entire |
| Zosterops albogularis | Norfolk Island white-eye | B05Q | V01 | Foreign | Endangered | Wherever found |
| Zosterops modesta | Seychelles white-eye | B03O | V01 | Foreign | Endangered | Wherever found |
| Zosterops rotensis | Rota bridled white-eye | B065 | V01 | 1 | Endangered | Wherever found |
| Zyzomys pedunculatus | Australian native mouse | A05W | V01 | Foreign | Endangered | Wherever found |