Species Search Results
897 Records
Here are all the species that match your criteria. Please click on the the Scientific Name to find out more about the particular species.
| Inverted Common Name | Scientific Name | Where Listed | Lead Region | Listing Status |
|---|---|---|---|---|
| ‘aku‘aku | Cyanea platyphylla | Wherever found | 1 | E |
| A`e | Zanthoxylum dipetalum var. tomentosum | Wherever found | 1 | E |
| A`e | Zanthoxylum hawaiiense | Wherever found | 1 | E |
| A`e | Zanthoxylum oahuense | Wherever found | 1 | E |
| `Ahinahina | Argyroxiphium sandwicense ssp. macrocephalum | Wherever found | 1 | T |
| `Ahinahina | Argyroxiphium sandwicense ssp. sandwicense | Wherever found | 1 | E |
| `Aiakeakua, popolo | Solanum sandwicense | Wherever found | 1 | E |
| `Aiea | Nothocestrum breviflorum | Wherever found | 1 | E |
| `Aiea | Nothocestrum latifolium | Wherever found | 1 | E |
| `Aiea | Nothocestrum peltatum | Wherever found | 1 | E |
| `Akoko | Euphorbia celastroides var. kaenana | Wherever found | 1 | E |
| `Akoko | Euphorbia deppeana | Wherever found | 1 | E |
| `Akoko | Euphorbia eleanoriae | Wherever found | 1 | E |
| `Akoko | Euphorbia haeleeleana | Wherever found | 1 | E |
| `Akoko | Euphorbia herbstii | Wherever found | 1 | E |
| `Akoko | Euphorbia kuwaleana | Wherever found | 1 | E |
| `Akoko | Euphorbia remyi var. kauaiensis | Wherever found | 1 | E |
| `Akoko | Euphorbia remyi var. remyi | Wherever found | 1 | E |
| `Akoko | Euphorbia rockii | Wherever found | 1 | E |
| 'Akoko | Euphorbia halemanui | Wherever found | 1 | E |
| `Akoko, Ewa Plains | Euphorbia skottsbergii var. skottsbergii | Wherever found | 1 | E |
| `aku | Cyanea tritomantha | Wherever found | 1 | E |
| `Ala `ala wai nui | Peperomia subpetiolata | Wherever found | 1 | E |
| Alani | Melicope adscendens | Wherever found | 1 | E |
| Alani | Melicope balloui | Wherever found | 1 | E |
| Alani | Melicope christophersenii | Wherever found | 1 | E |
| Alani | Melicope degeneri | Wherever found | 1 | E |
| Alani | Melicope haupuensis | Wherever found | 1 | E |
| Alani | Melicope hiiakae | Wherever found | 1 | E |
| Alani | Melicope knudsenii | Wherever found | 1 | E |
| Alani | Melicope lydgatei | Wherever found | 1 | E |
| Alani | Melicope makahae | Wherever found | 1 | E |
| Alani | Melicope mucronulata | Wherever found | 1 | E |
| Alani | Melicope munroi | Wherever found | 1 | E |
| Alani | Melicope ovalis | Wherever found | 1 | E |
| Alani | Melicope pallida | Wherever found | 1 | E |
| Alani | Melicope paniculata | Wherever found | 1 | E |
| Alani | Melicope puberula | Wherever found | 1 | E |
| Alani | Melicope quadrangularis | Wherever found | 1 | E |
| Alani | Melicope reflexa | Wherever found | 1 | E |
| Alani | Melicope saint-johnii | Wherever found | 1 | E |
| Alani | Melicope zahlbruckneri | Wherever found | 1 | E |
| Allocarya, Calistoga | Plagiobothrys strictus | Wherever found | 8 | E |
| Alopecurus, Sonoma | Alopecurus aequalis var. sonomensis | Wherever found | 8 | E |
| Amaranth, seabeach | Amaranthus pumilus | Wherever found | 4 | T |
| Ambrosia, San Diego | Ambrosia pumila | Wherever found | 8 | E |
| Ambrosia, south Texas | Ambrosia cheiranthifolia | Wherever found | 2 | E |
| amole, purple | Chlorogalum purpureum | Wherever found | 8 | T |
| Amphianthus, little | Amphianthus pusillus | Wherever found | 4 | T |
| `Anaunau | Lepidium arbuscula | Wherever found | 1 | E |
| `Anunu | Sicyos albus | Wherever found | 1 | E |
| `Anunu | Sicyos macrophyllus | Wherever found | 1 | E |
| Aplokating-palaoan | Psychotria malaspinae | Wherever found | 1 | E |
| Arrowhead, bunched | Sagittaria fasciculata | Wherever found | 4 | E |
| Aster, decurrent false | Boltonia decurrens | Wherever found | 3 | T |
| Aster, Florida golden | Chrysopsis floridana | Wherever found | 4 | E |
| Aster, Ruth's golden | Pityopsis ruthii | Wherever found | 4 | E |
| Aupaka | Isodendrion hosakae | Wherever found | 1 | E |
| Aupaka | Isodendrion laurifolium | Wherever found | 1 | E |
| Aupaka | Isodendrion longifolium | Wherever found | 1 | T |
| Avens, spreading | Geum radiatum | Wherever found | 4 | E |
| `Awikiwiki | Canavalia molokaiensis | Wherever found | 1 | E |
| `Awikiwiki | Canavalia napaliensis | Wherever found | 1 | E |
| `Awikiwiki | Canavalia pubescens | Wherever found | 1 | E |
| Awiwi | Centaurium sebaeoides | Wherever found | 1 | E |
| 'Awiwi | Kadua cookiana | Wherever found | 1 | E |
| Ayenia, Texas | Ayenia limitaris | Wherever found | 2 | E |
| Baccharis, Encinitas | Baccharis vanessae | Wherever found | 8 | T |
| Barbara's Buttons, Mohr's | Marshallia mohrii | Wherever found | 4 | T |
| Barberry, island | Berberis pinnata ssp. insularis | Wherever found | 8 | E |
| Barberry, Nevin's | Berberis nevinii | Wherever found | 8 | E |
| Bariaco | Trichilia triacantha | Wherever found | 4 | E |
| Beaked-rush, Knieskern's | Rhynchospora knieskernii | Wherever found | 5 | T |
| bean, sea | Mucuna sloanei persericea | Wherever found | 1 | E |
| beardtongue, Parachute | Penstemon debilis | Wherever found | 6 | T |
| Beardtongue, Penland | Penstemon penlandii | Wherever found | 6 | E |
| Beargrass, Britton's | Nolina brittoniana | Wherever found | 4 | E |
| Bear-poppy, Dwarf | Arctomecon humilis | Wherever found | 6 | E |
| Beauty, Harper's | Harperocallis flava | Wherever found | 4 | E |
| Bedstraw, El Dorado | Galium californicum ssp. sierrae | Wherever found | 8 | E |
| Bedstraw, island | Galium buxifolium | Wherever found | 8 | E |
| Bellflower, Brooksville | Campanula robinsiae | Wherever found | 4 | E |
| Birch, Virginia round-leaf | Betula uber | Wherever found | 5 | T |
| Bird's beak, palmate-bracted | Cordylanthus palmatus | Wherever found | 8 | E |
| Bird's-beak, Pennell's | Cordylanthus tenuis ssp. capillaris | Wherever found | 8 | E |
| Bird's-beak, salt marsh | Cordylanthus maritimus ssp. maritimus | Wherever found | 8 | E |
| Bird's-beak, soft | Cordylanthus mollis ssp. mollis | Wherever found | 8 | E |
| Birds-in-a-nest, white | Macbridea alba | Wherever found | 4 | T |
| Bittercress, small-anthered | Cardamine micranthera | Wherever found | 4 | E |
| Bladderpod, Dudley Bluffs | Lesquerella congesta | Wherever found | 6 | T |
| Bladderpod, kodachrome | Lesquerella tumulosa | Wherever found | 6 | E |
| Bladderpod, lyrate | Lesquerella lyrata | Wherever found | 4 | T |
| bladderpod, Missouri | Physaria filiformis | Wherever found | 3 | T |
| Bladderpod, San Bernardino Mountains | Lesquerella kingii ssp. bernardina | Wherever found | 8 | E |
| Bladderpod, Short's | Physaria globosa | Wherever found | 4 | E |
| Bladderpod, Spring Creek | Lesquerella perforata | Wherever found | 4 | E |
| Bladderpod, white | Lesquerella pallida | Wherever found | 2 | E |
| Bladderpod, White Bluffs | Physaria douglasii ssp. tuplashensis | Wherever found | 1 | T |
| Bladderpod, Zapata | Lesquerella thamnophila | Wherever found | 2 | E |
| Blazingstar, Ash Meadows | Mentzelia leucophylla | Wherever found | 8 | T |
| Blazingstar, Heller's | Liatris helleri | Wherever found | 4 | T |
| Blazingstar, scrub | Liatris ohlingerae | Wherever found | 4 | E |
| Bluecurls, Hidden Lake | Trichostema austromontanum ssp. compactum | Wherever found | 8 | T |
| Bluegrass, Hawaiian | Poa sandvicensis | Wherever found | 1 | E |
| Bluegrass, Mann's | Poa mannii | Wherever found | 1 | E |
| Bluegrass, Napa | Poa napensis | Wherever found | 8 | E |
| Bluegrass, San Bernardino | Poa atropurpurea | Wherever found | 8 | E |
| Blue-star, Kearney's | Amsonia kearneyana | Wherever found | 2 | E |
| Bluet, Roan Mountain | Hedyotis purpurea var. montana | Wherever found | 4 | E |
| Bonamia, Florida | Bonamia grandiflora | Wherever found | 4 | T |
| Boxwood, Vahl's | Buxus vahlii | Wherever found | 4 | E |
| Brickell-bush, Florida | Brickellia mosieri | Wherever found | 4 | E |
| Brodiaea, Chinese Camp | Brodiaea pallida | Wherever found | 8 | T |
| Brodiaea, thread-leaved | Brodiaea filifolia | Wherever found | 8 | T |
| Buckwheat, cushenbury | Eriogonum ovalifolium var. vineum | Wherever found | 8 | E |
| Buckwheat, Ione (incl. Irish Hill) | Eriogonum apricum (incl. var. prostratum) | Wherever found | 8 | E |
| Buckwheat, scrub | Eriogonum longifolium var. gnaphalifolium | Wherever found | 4 | T |
| Buckwheat, steamboat | Eriogonum ovalifolium var. williamsiae | Wherever found | 8 | E |
| Buckwheat, Umtanum Desert | Eriogonum codium | Wherever found | 1 | T |
| Bulrush, Northeastern | Scirpus ancistrochaetus | Wherever found | 5 | E |
| Bush-clover, prairie | Lespedeza leptostachya | Wherever found | 3 | T |
| Bush-mallow, San Clemente Island | Malacothamnus clementinus | Wherever found | 8 | E |
| Bush-mallow, Santa Cruz Island | Malacothamnus fasciculatus var. nesioticus | Wherever found | 8 | E |
| Buttercup, autumn | Ranunculus aestivalis (=acriformis) | Wherever found | 6 | E |
| Butterfly plant, Colorado | Gaura neomexicana var. coloradensis | Wherever found | 6 | T |
| Butterweed, Layne's | Senecio layneae | Wherever found | 8 | T |
| Butterwort, Godfrey's | Pinguicula ionantha | Wherever found | 4 | T |
| Button-celery, San Diego | Eryngium aristulatum var. parishii | Wherever found | 8 | E |
| Cactus, Acuna | Echinomastus erectocentrus var. acunensis | Wherever found | 2 | E |
| Cactus, Arizona hedgehog | Echinocereus triglochidiatus var. arizonicus | Wherever found | 2 | E |
| Cactus, Bakersfield | Opuntia treleasei | Wherever found | 8 | E |
| Cactus, black lace | Echinocereus reichenbachii var. albertii | Wherever found | 2 | E |
| Cactus, Brady pincushion | Pediocactus bradyi | Wherever found | 2 | E |
| Cactus, Chisos Mountain hedgehog | Echinocereus chisoensis var. chisoensis | Wherever found | 2 | T |
| Cactus, Cochise pincushion | Coryphantha robbinsiorum | Wherever found | 2 | T |
| Cactus, Colorado hookless | Sclerocactus glaucus | Wherever found | 6 | T |
| Cactus, Fickeisen plains | Pediocactus peeblesianus fickeiseniae | Wherever found | 2 | E |
| Cactus, Florida semaphore | Consolea corallicola | Wherever found | 4 | E |
| Cactus, Key tree | Pilosocereus robinii | Wherever found | 4 | E |
| Cactus, Knowlton's | Pediocactus knowltonii | Wherever found | 2 | E |
| Cactus, Kuenzler hedgehog | Echinocereus fendleri var. kuenzleri | Wherever found | 2 | E |
| Cactus, Lee pincushion | Coryphantha sneedii var. leei | Wherever found | 2 | T |
| Cactus, Lloyd's Mariposa | Echinomastus mariposensis | Wherever found | 2 | T |
| Cactus, Mesa Verde | Sclerocactus mesae-verdae | Wherever found | 2 | T |
| Cactus, Nellie cory | Coryphantha minima | Wherever found | 2 | E |
| Cactus, Nichol's Turk's head | Echinocactus horizonthalonius var. nicholii | Wherever found | 2 | E |
| cactus, Pariette | Sclerocactus brevispinus | Wherever found | 6 | T |
| Cactus, Peebles Navajo | Pediocactus peeblesianus var. peeblesianus | Wherever found | 2 | E |
| Cactus, Pima pineapple | Coryphantha scheeri var. robustispina | Wherever found | 2 | E |
| Cactus, San Rafael | Pediocactus despainii | Wherever found | 6 | E |
| Cactus, Siler pincushion | Pediocactus (=Echinocactus,=Utahia) sileri | Wherever found | 2 | T |
| Cactus, Sneed pincushion | Coryphantha sneedii var. sneedii | Wherever found | 2 | E |
| Cactus, star | Astrophytum asterias | Wherever found | 2 | E |
| cactus, Tobusch fishhook | Sclerocactus brevihamatus ssp. tobuschii | Wherever found | 2 | E |
| cactus, Uinta Basin hookless | Sclerocactus wetlandicus | Wherever found | 6 | T |
| Cactus, Winkler | Pediocactus winkleri | Wherever found | 6 | T |
| Cactus, Wright fishhook | Sclerocactus wrightiae | Wherever found | 6 | E |
| Campion, fringed | Silene polypetala | Wherever found | 4 | E |
| Capa rosa | Callicarpa ampla | Wherever found | 4 | E |
| Catchfly, Spalding's | Silene spaldingii | Wherever found | 1 | T |
| Cat's-eye, Terlingua Creek | Cryptantha crassipes | Wherever found | 2 | E |
| Ceanothus, coyote | Ceanothus ferrisae | Wherever found | 8 | E |
| Ceanothus, Pine Hill | Ceanothus roderickii | Wherever found | 8 | E |
| Ceanothus, Vail Lake | Ceanothus ophiochilus | Wherever found | 8 | T |
| Centaury, spring-loving | Centaurium namophilum | Wherever found | 8 | T |
| Chaff-flower, round-leaved | Achyranthes splendens var. rotundata | Wherever found | 1 | E |
| Chaffseed, American | Schwalbea americana | Wherever found | 4 | E |
| Checker-mallow, Keck's | Sidalcea keckii | Wherever found | 8 | E |
| Checker-mallow, Kenwood Marsh | Sidalcea oregana ssp. valida | Wherever found | 8 | E |
| Checker-mallow, Nelson's | Sidalcea nelsoniana | Wherever found | 1 | T |
| Checker-mallow, pedate | Sidalcea pedata | Wherever found | 8 | E |
| Checkermallow, Wenatchee Mountains | Sidalcea oregana var. calva | Local Endemic | 1 | E |
| Chumbo, Higo | Harrisia portoricensis | Wherever found | 4 | T |
| Chupacallos | Pleodendron macranthum | Wherever found | 4 | E |
| Clarkia, Pismo | Clarkia speciosa ssp. immaculata | Wherever found | 8 | E |
| Clarkia, Presidio | Clarkia franciscana | Wherever found | 8 | E |
| Clarkia, Springville | Clarkia springvillensis | Wherever found | 8 | T |
| Clarkia, Vine Hill | Clarkia imbricata | Wherever found | 8 | E |
| Cliffrose, Arizona | Purshia (=Cowania) subintegra | Wherever found | 2 | E |
| Clover, Monterey | Trifolium trichocalyx | Wherever found | 8 | E |
| Clover, running buffalo | Trifolium stoloniferum | Wherever found | 3 | E |
| Clover, showy Indian | Trifolium amoenum | Wherever found | 8 | E |
| Cobana negra | Stahlia monosperma | Wherever found | 4 | T |
| Coneflower, smooth | Echinacea laevigata | Wherever found | 4 | E |
| Cory cactus, bunched | Coryphantha ramillosa | Wherever found | 2 | T |
| Crownbeard, big-leaved | Verbesina dissita | Wherever found | 8 | T |
| Crownscale, San Jacinto Valley | Atriplex coronata var. notatior | Wherever found | 8 | E |
| Cycladenia, Jones | Cycladenia humilis var. jonesii | Wherever found | 6 | T |
| Daisy, Lakeside | Hymenoxys herbacea | Wherever found | 3 | T |
| Daisy, Parish's | Erigeron parishii | Wherever found | 8 | T |
| Daisy, Willamette | Erigeron decumbens | Wherever found | 1 | E |
| Dawn-flower, Texas prairie | Hymenoxys texana | Wherever found | 2 | E |
| Desert-parsley, Bradshaw's | Lomatium bradshawii | Wherever found | 1 | E |
| Dogweed, ashy | Thymophylla tephroleuca | Wherever found | 2 | E |
| Dropwort, Canby's | Oxypolis canbyi | Wherever found | 4 | E |
| Dudleya, Conejo | Dudleya abramsii ssp. parva | Wherever found | 8 | T |
| Dudleya, marcescent | Dudleya cymosa ssp. marcescens | Wherever found | 8 | T |
| Dudleya, Santa Clara Valley | Dudleya setchellii | Wherever found | 8 | E |
| Dudleya, Santa Cruz Island | Dudleya nesiotica | Wherever found | 8 | T |
| Dudleya, Santa Monica Mountains | Dudleya cymosa ssp. ovatifolia | Wherever found | 8 | T |
| Dudleya, Verity's | Dudleya verityi | Wherever found | 8 | T |
| Dwarf-flax, Marin | Hesperolinon congestum | Wherever found | 8 | T |
| `Ena`ena | Pseudognaphalium (=Gnaphalium) sandwicensium var. molokaiense | Wherever found | 1 | E |
| Erubia | Solanum drymophilum | Wherever found | 4 | E |
| Evening-primrose, Antioch Dunes | Oenothera deltoides ssp. howellii | Wherever found | 8 | E |
| Evening-primrose, Eureka Valley | Oenothera avita ssp. eurekensis | Wherever found | 8 | E |
| Evening-primrose, San Benito | Camissonia benitensis | Wherever found | 8 | T |
| Fiddleneck, large-flowered | Amsinckia grandiflora | Wherever found | 8 | E |
| Flannelbush, Mexican | Fremontodendron mexicanum | Wherever found | 8 | E |
| Flannelbush, Pine Hill | Fremontodendron californicum ssp. decumbens | Wherever found | 8 | E |
| Flax, Carter's small-flowered | Linum carteri carteri | Wherever found | 4 | E |
| Flax, sand | Linum arenicola | Wherever found | 4 | E |
| Fleabane, Zuni | Erigeron rhizomatus | Wherever found | 2 | T |
| Four-o'clock, MacFarlane's | Mirabilis macfarlanei | Wherever found | 1 | T |
| Fringepod, Santa Cruz Island | Thysanocarpus conchuliferus | Wherever found | 8 | E |
| Fringe-tree, pygmy | Chionanthus pygmaeus | Wherever found | 4 | E |
| Fritillary, Gentner's | Fritillaria gentneri | Wherever found | 1 | E |
| Gardenia (=Na`u), Hawaiian | Gardenia brighamii | Wherever found | 1 | E |
| Geranium, Hawaiian red-flowered | Geranium arboreum | Wherever found | 1 | E |
| Gerardia, sandplain | Agalinis acuta | Wherever found | 5 | E |
| Gilia, Hoffmann's slender-flowered | Gilia tenuiflora ssp. hoffmannii | Wherever found | 8 | E |
| Gilia, Monterey | Gilia tenuiflora ssp. arenaria | Wherever found | 8 | E |
| Gladecress, Fleshy-fruit | Leavenworthia crassa | Wherever found | 4 | E |
| Glade cress, Kentucky | Leavenworthia exigua laciniata | Wherever found | 4 | T |
| Gladecress, Texas golden | Leavenworthia texana | Wherever found | 2 | E |
| Goetzea, beautiful | Goetzea elegans | Wherever found | 4 | E |
| Goldenrod, Blue Ridge | Solidago spithamaea | Wherever found | 4 | T |
| Goldenrod, Houghton's | Solidago houghtonii | Wherever found | 3 | T |
| Goldenrod, Short's | Solidago shortii | Wherever found | 4 | E |
| Goldfields, Burke's | Lasthenia burkei | Wherever found | 8 | E |
| Goldfields, Contra Costa | Lasthenia conjugens | Wherever found | 8 | E |
| Gooseberry, Miccosukee | Ribes echinellum | Wherever found | 4 | T |
| Gourd, Okeechobee | Cucurbita okeechobeensis ssp. okeechobeensis | Wherever found | 4 | E |
| Grass, Colusa | Neostapfia colusana | Wherever found | 8 | T |
| Grass, Eureka Dune | Swallenia alexandrae | Wherever found | 8 | E |
| Grass, Solano | Tuctoria mucronata | Wherever found | 8 | E |
| Grass, Tennessee yellow-eyed | Xyris tennesseensis | Wherever found | 4 | E |
| Ground-plum, Guthrie's (=Pyne's) | Astragalus bibullatus | Wherever found | 4 | E |
| Gumplant, Ash Meadows | Grindelia fraxinipratensis | Wherever found | 8 | T |
| Haha | Cyanea acuminata | Wherever found | 1 | E |
| Haha | Cyanea asarifolia | Wherever found | 1 | E |
| Haha | Cyanea asplenifolia | Wherever found | 1 | E |
| Haha | Cyanea calycina | Wherever found | 1 | E |
| Haha | Cyanea copelandii ssp. copelandii | Wherever found | 1 | E |
| Haha | Cyanea copelandii ssp. haleakalaensis | Wherever found | 1 | E |
| haha | Cyanea crispa | Wherever found | 1 | E |
| Haha | Cyanea dolichopoda | Wherever found | 1 | E |
| Haha | Cyanea dunbarii | Wherever found | 1 | E |
| haha | Cyanea duvalliorum | Wherever found | 1 | E |
| Haha | Cyanea eleeleensis | Wherever found | 1 | E |
| Haha | Cyanea glabra | Wherever found | 1 | E |
| Haha | Cyanea grimesiana ssp. grimesiana | Wherever found | 1 | E |
| Haha | Cyanea grimesiana ssp. obatae | Wherever found | 1 | E |
| Haha | Cyanea hamatiflora ssp. carlsonii | Wherever found | 1 | E |
| Haha | Cyanea hamatiflora ssp. hamatiflora | Wherever found | 1 | E |
| Haha | Cyanea humboldtiana | Wherever found | 1 | E |
| Haha | Cyanea kolekoleensis | Wherever found | 1 | E |
| Haha | Cyanea koolauensis | Wherever found | 1 | E |
| Haha | Cyanea kuhihewa | Wherever found | 1 | E |
| Haha | Cyanea kunthiana | Wherever found | 1 | E |
| Haha | Cyanea lanceolata | Wherever found | 1 | E |
| Haha | Cyanea lobata | Wherever found | 1 | E |
| Haha | Cyanea longiflora | Wherever found | 1 | E |
| Haha | Cyanea macrostegia ssp. gibsonii | Wherever found | 1 | E |
| haha | Cyanea magnicalyx | Wherever found | 1 | E |
| Haha | Cyanea mannii | Wherever found | 1 | E |
| haha | Cyanea maritae | Wherever found | 1 | E |
| Haha | Cyanea marksii | Wherever found | 1 | E |
| haha | Cyanea mauiensis | Wherever found | 1 | E |
| Haha | Cyanea mceldowneyi | Wherever found | 1 | E |
| haha | Cyanea munroi | Wherever found | 1 | E |
| Haha | Cyanea obtusa | Wherever found | 1 | E |
| Haha | Cyanea pinnatifida | Wherever found | 1 | E |
| Haha | Cyanea procera | Wherever found | 1 | E |
| Haha | Cyanea recta | Wherever found | 1 | T |
| Haha | Cyanea remyi | Wherever found | 1 | E |
| Haha | Cyanea rivularis | Wherever found | 1 | E |
| Haha | Cyanea shipmanii | Wherever found | 1 | E |
| Haha | Cyanea stictophylla | Wherever found | 1 | E |
| Haha | Cyanea st.-johnii | Wherever found | 1 | E |
| Haha | Cyanea superba | Wherever found | 1 | E |
| Haha | Cyanea truncata | Wherever found | 1 | E |
| Haha | Cyanea undulata | Wherever found | 1 | E |
| haiwale | Cyrtandra ferripilosa | Wherever found | 1 | E |
| Haiwale | Cyrtandra paliku | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra crenata | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra dentata | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra filipes | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra giffardii | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra hematos | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra kaulantha | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra limahuliensis | Wherever found | 1 | T |
| Ha`iwale | Cyrtandra munroi | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra oenobarba | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra oxybapha | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra polyantha | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra sessilis | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra subumbellata | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra tintinnabula | Wherever found | 1 | E |
| Ha`iwale | Cyrtandra viridiflora | Wherever found | 1 | E |
| Hala pepe | Pleomele fernaldii | Wherever found | 1 | E |
| Hala pepe | Pleomele forbesii | Wherever found | 1 | E |
| Hala pepe | Pleomele hawaiiensis | Wherever found | 1 | E |
| halomtano, Berenghenas | Solanum guamense | Wherever found | 1 | E |
| halumtano, Cebello | Bulbophyllum guamense | Wherever found | 1 | T |
| Harebells, Avon Park | Crotalaria avonensis | Wherever found | 4 | E |
| Harperella | Ptilimnium nodosum | Wherever found | 5 | E |
| Hau kuahiwi | Hibiscadelphus giffardianus | Wherever found | 1 | E |
| Hau kuahiwi | Hibiscadelphus hualalaiensis | Wherever found | 1 | E |
| Hau kuahiwi | Hibiscadelphus woodii | Wherever found | 1 | E |
| Heartleaf, dwarf-flowered | Hexastylis naniflora | Wherever found | 4 | T |
| Heather, mountain golden | Hudsonia montana | Wherever found | 4 | T |
| Heau | Exocarpos luteolus | Wherever found | 1 | E |
| Hibiscus, Clay's | Hibiscus clayi | Wherever found | 1 | E |
| Higuero de sierra | Crescentia portoricensis | Wherever found | 4 | E |
| Ho`awa | Pittosporum napaliense | Wherever found | 1 | E |
| Holei | Ochrosia haleakalae | Wherever found | 1 | E |
| Holei | Ochrosia kilaueaensis | Wherever found | 1 | E |
| Holly, Cook's | Ilex cookii | Wherever found | 4 | E |
| Honohono | Haplostachys haplostachya | Wherever found | 1 | E |
| Howellia, water | Howellia aquatilis | Wherever found | 6 | T |
| Hulumoa | Korthalsella degeneri | Wherever found | 1 | E |
| Hypericum, highlands scrub | Hypericum cumulicola | Wherever found | 4 | E |
| Iagu, Hayun (=(Guam), Tronkon guafi (Rota)) | Serianthes nelsonii | Wherever found | 1 | E |
| Ihi | Portulaca villosa | Wherever found | 1 | E |
| Iliau, dwarf | Wilkesia hobdyi | Wherever found | 1 | E |
| Indian paintbrush, San Clemente Island | Castilleja grisea | Wherever found | 8 | T |
| Ipomopsis, Holy Ghost | Ipomopsis sancti-spiritus | Wherever found | 2 | E |
| Iris, dwarf lake | Iris lacustris | Wherever found | 3 | T |
| Irisette, white | Sisyrinchium dichotomum | Wherever found | 4 | E |
| Ischaemum, Hilo | Ischaemum byrone | Wherever found | 1 | E |
| Ivesia, Ash Meadows | Ivesia kingii var. eremica | Wherever found | 8 | T |
| Ivesia, Webber | Ivesia webberi | Wherever found | 8 | T |
| Jacquemontia, beach | Jacquemontia reclinata | Wherever found | 4 | E |
| Jewelflower, California | Caulanthus californicus | Wherever found | 8 | E |
| Jewelflower, Metcalf Canyon | Streptanthus albidus ssp. albidus | Wherever found | 8 | E |
| Jewelflower, Tiburon | Streptanthus niger | Wherever found | 8 | E |
| Joint-vetch, Sensitive | Aeschynomene virginica | Wherever found | 5 | T |
| Kamakahala | Labordia cyrtandrae | Wherever found | 1 | E |
| Kamakahala | Labordia helleri | Wherever found | 1 | E |
| Kamakahala | Labordia lydgatei | Wherever found | 1 | E |
| Kamakahala | Labordia pumila | Wherever found | 1 | E |
| Kamakahala | Labordia tinifolia var. lanaiensis | Wherever found | 1 | E |
| Kamakahala | Labordia tinifolia var. wahiawaensis | Wherever found | 1 | E |
| Kamakahala | Labordia triflora | Wherever found | 1 | E |
| Kamanomano | Cenchrus agrimonioides | Wherever found | 1 | E |
| Kampua`a | Kadua (=Hedyotis) fluviatilis | Wherever found | 1 | E |
| Kauai hau kuahiwi | Hibiscadelphus distans | Wherever found | 1 | E |
| Kauila | Colubrina oppositifolia | Wherever found | 1 | E |
| Kaulu | Pteralyxia kauaiensis | Wherever found | 1 | E |
| Kaulu | Pteralyxia macrocarpa | Wherever found | 1 | E |
| Kio`ele | Kadua coriacea | Wherever found | 1 | E |
| Kiponapona | Phyllostegia racemosa | Wherever found | 1 | E |
| Kohe malama malama o kanaloa | Kanaloa kahoolawensis | Wherever found | 1 | E |
| Koholapehu | Dubautia latifolia | Wherever found | 1 | E |
| Koki`o | Kokia drynarioides | Wherever found | 1 | E |
| Koki`o | Kokia kauaiensis | Wherever found | 1 | E |
| Koki`o, Cooke's | Kokia cookei | Wherever found | 1 | E |
| Koki`o ke`oke`o | Hibiscus arnottianus ssp. immaculatus | Wherever found | 1 | E |
| Koki`o ke`oke`o | Hibiscus waimeae ssp. hannerae | Wherever found | 1 | E |
| Kolea | Myrsine fosbergii | Wherever found | 1 | E |
| Kolea | Myrsine juddii | Wherever found | 1 | E |
| Kolea | Myrsine knudsenii | Wherever found | 1 | E |
| Kolea | Myrsine linearifolia | Wherever found | 1 | T |
| Kolea | Myrsine mezii | Wherever found | 1 | E |
| Kolea | Myrsine vaccinioides | Wherever found | 1 | E |
| Ko`oko`olau | Bidens amplectens | Wherever found | 1 | E |
| Ko`oko`olau | Bidens campylotheca pentamera | Wherever found | 1 | E |
| Ko`oko`olau | Bidens campylotheca waihoiensis | Wherever found | 1 | E |
| Ko`oko`olau | Bidens conjuncta | Wherever found | 1 | E |
| Ko`oko`olau | Bidens micrantha ctenophylla | Wherever found | 1 | E |
| Ko`oko`olau | Bidens micrantha ssp. kalealaha | Wherever found | 1 | E |
| Ko`oko`olau | Bidens wiebkei | Wherever found | 1 | E |
| Ko`oloa`ula | Abutilon menziesii | Wherever found | 1 | E |
| Kopa | Hedyotis schlechtendahliana var. remyi | Wherever found | 1 | E |
| Kopiko | Psychotria grandiflora | Wherever found | 1 | E |
| Kopiko | Psychotria hobdyi | Wherever found | 1 | E |
| Kuahiwi laukahi | Plantago hawaiensis | Wherever found | 1 | E |
| Kuahiwi laukahi | Plantago princeps | Wherever found | 1 | E |
| Kuawawaenohu | Schiedea lychnoides | Wherever found | 1 | E |
| Kula wahine noho | Isodendrion pyrifolium | Wherever found | 1 | E |
| Kulu`i | Nototrichium humile | Wherever found | 1 | E |
| Ladies'-tresses, Canelo Hills | Spiranthes delitescens | Wherever found | 2 | E |
| Ladies'-tresses, Navasota | Spiranthes parksii | Wherever found | 2 | E |
| Ladies'-tresses, Ute | Spiranthes diluvialis | Wherever found | 6 | T |
| Larkspur, Baker's | Delphinium bakeri | Wherever found | 8 | E |
| Larkspur, San Clemente Island | Delphinium variegatum ssp. kinkiense | Wherever found | 8 | E |
| Larkspur, yellow | Delphinium luteum | Wherever found | 8 | E |
| Lau `ehu | Panicum niihauense | Wherever found | 1 | E |
| Laulihilihi | Schiedea stellarioides | Wherever found | 1 | E |
| Layia, beach | Layia carnosa | Wherever found | 8 | E |
| Lead-plant, Crenulate | Amorpha crenulata | Wherever found | 4 | E |
| Leather flower, Alabama | Clematis socialis | Wherever found | 4 | E |
| Leather flower, Morefield's | Clematis morefieldii | Wherever found | 4 | E |
| lehua makanoe | Lysimachia daphnoides | Wherever found | 1 | E |
| Lessingia, San Francisco | Lessingia germanorum (=L.g. var. germanorum) | Wherever found | 8 | E |
| Liliwai | Acaena exigua | Wherever found | 1 | E |
| Lily, Minnesota dwarf trout | Erythronium propullans | Wherever found | 3 | E |
| Lily, Pitkin Marsh | Lilium pardalinum ssp. pitkinense | Wherever found | 8 | E |
| Lily, Western | Lilium occidentale | Wherever found | 8 | E |
| Liveforever, Laguna Beach | Dudleya stolonifera | Wherever found | 8 | T |
| Liveforever, Santa Barbara Island | Dudleya traskiae | Wherever found | 8 | E |
| Locoweed, Fassett's | Oxytropis campestris var. chartacea | Wherever found | 3 | T |
| Lomatium, Cook's | Lomatium cookii | Wherever found | 1 | E |
| Loosestrife, rough-leaved | Lysimachia asperulaefolia | Wherever found | 4 | E |
| Lotus, San Clemente Island | Acmispon dendroideus var. traskiae (=Lotus d. ssp. traskiae) | Wherever found | 8 | T |
| Lo`ulu | Pritchardia kaalae | Wherever found | 1 | E |
| Lo`ulu | Pritchardia lanigera | Wherever found | 1 | E |
| Lo`ulu | Pritchardia maideniana | Wherever found | 1 | E |
| Lo`ulu | Pritchardia munroi | Wherever found | 1 | E |
| Lo`ulu | Pritchardia napaliensis | Wherever found | 1 | E |
| Lo`ulu | Pritchardia remota | Wherever found | 1 | E |
| Lo`ulu | Pritchardia schattaueri | Wherever found | 1 | E |
| Lo`ulu | Pritchardia viscosa | Wherever found | 1 | E |
| Lo`ulu, (=Na`ena`e) | Pritchardia hardyi | Wherever found | 1 | E |
| Lousewort, Furbish | Pedicularis furbishiae | Wherever found | 5 | E |
| Love grass, Fosberg's | Eragrostis fosbergii | Wherever found | 1 | E |
| Lupine, clover | Lupinus tidestromii | Wherever found | 8 | E |
| Lupine, Kincaid's | Lupinus sulphureus ssp. kincaidii | Wherever found | 1 | T |
| Lupine, Nipomo Mesa | Lupinus nipomensis | Wherever found | 8 | E |
| Lupine, scrub | Lupinus aridorum | Wherever found | 4 | E |
| Mahoe | Alectryon macrococcus | Wherever found | 1 | E |
| Makou | Peucedanum sandwicense | Wherever found | 1 | T |
| Makou | Ranunculus hawaiensis | Wherever found | 1 | E |
| Makou | Ranunculus mauiensis | Wherever found | 1 | E |
| Malacothrix, island | Malacothrix squalida | Wherever found | 8 | E |
| Malacothrix, Santa Cruz Island | Malacothrix indecora | Wherever found | 8 | E |
| mallow, Gierisch | Sphaeralcea gierischii | Wherever found | 2 | E |
| Mallow, Kern | Eremalche kernensis | Wherever found | 8 | E |
| Mallow, Peter's Mountain | Iliamna corei | Wherever found | 5 | E |
| Manaca, palma de | Calyptronoma rivalis | Wherever found | 4 | T |
| Manioc, Walker's | Manihot walkerae | Wherever found | 2 | E |
| Manzanita, Del Mar | Arctostaphylos glandulosa ssp. crassifolia | Wherever found | 8 | E |
| Manzanita, Franciscan | Arctostaphylos franciscana | Wherever found | 8 | E |
| Manzanita, Ione | Arctostaphylos myrtifolia | Wherever found | 8 | T |
| Manzanita, Morro | Arctostaphylos morroensis | Wherever found | 8 | T |
| Manzanita, pallid | Arctostaphylos pallida | Wherever found | 8 | T |
| Manzanita, Presidio | Arctostaphylos hookeri var. ravenii | Wherever found | 8 | E |
| Manzanita, Santa Rosa Island | Arctostaphylos confertiflora | Wherever found | 8 | E |
| Ma`o hau hele, (=native yellow hibiscus) | Hibiscus brackenridgei | Wherever found | 1 | E |
| Ma`oli`oli | Schiedea apokremnos | Wherever found | 1 | E |
| Ma`oli`oli | Schiedea hawaiiensis | Wherever found | 1 | E |
| Ma`oli`oli | Schiedea kealiae | Wherever found | 1 | E |
| Ma`oli`oli | Schiedea pubescens | Wherever found | 1 | E |
| Mapele | Cyrtandra cyaneoides | Wherever found | 1 | E |
| Mariposa lily, Tiburon | Calochortus tiburonensis | Wherever found | 8 | T |
| Meadowfoam, Butte County | Limnanthes floccosa ssp. californica | Wherever found | 8 | E |
| Meadowfoam, large-flowered woolly | Limnanthes floccosa ssp. grandiflora | Wherever found | 1 | E |
| Meadowfoam, Sebastopol | Limnanthes vinculans | Wherever found | 8 | E |
| Meadowrue, Cooley's | Thalictrum cooleyi | Wherever found | 4 | E |
| Mehamehame | Flueggea neowawraea | Wherever found | 1 | E |
| Mesa-mint, Otay | Pogogyne nudiuscula | Wherever found | 8 | E |
| Mesa-mint, San Diego | Pogogyne abramsii | Wherever found | 8 | E |
| Milkpea, Small's | Galactia smallii | Wherever found | 4 | E |
| Milk-vetch, Applegate's | Astragalus applegatei | Wherever found | 8 | E |
| Milk-vetch, Ash meadows | Astragalus phoenix | Wherever found | 8 | T |
| Milk-vetch, Braunton's | Astragalus brauntonii | Wherever found | 8 | E |
| Milk-vetch, Clara Hunt's | Astragalus clarianus | Wherever found | 8 | E |
| Milk-vetch, Coachella Valley | Astragalus lentiginosus var. coachellae | Wherever found | 8 | E |
| Milk-vetch, coastal dunes | Astragalus tener var. titi | Wherever found | 8 | E |
| Milk-vetch, Cushenbury | Astragalus albens | Wherever found | 8 | E |
| milkvetch, Deseret | Astragalus desereticus | Wherever found | 6 | T |
| Milk-vetch, Fish Slough | Astragalus lentiginosus var. piscinensis | Wherever found | 8 | T |
| Milk-vetch, heliotrope | Astragalus montii | Wherever found | 6 | T |
| Milk-vetch, Holmgren | Astragalus holmgreniorum | Wherever found | 6 | E |
| Milk-vetch, Jesup's | Astragalus robbinsii var. jesupi | Wherever found | 5 | E |
| Milk-vetch, Lane Mountain | Astragalus jaegerianus | Wherever found | 8 | E |
| Milk-vetch, Mancos | Astragalus humillimus | Wherever found | 2 | E |
| milkvetch, Osterhout | Astragalus osterhoutii | Wherever found | 6 | E |
| Milk-vetch, Peirson's | Astragalus magdalenae var. peirsonii | Wherever found | 8 | T |
| Milk-vetch, Sentry | Astragalus cremnophylax var. cremnophylax | Wherever found | 2 | E |
| Milk-vetch, Shivwits | Astragalus ampullarioides | Wherever found | 6 | E |
| Milk-vetch, triple-ribbed | Astragalus tricarinatus | Wherever found | 8 | E |
| Milk-vetch, Ventura Marsh | Astragalus pycnostachyus var. lanosissimus | Wherever found | 8 | E |
| Milkweed, Mead's | Asclepias meadii | Wherever found | 3 | T |
| Milkweed, Welsh's | Asclepias welshii | Wherever found | 6 | T |
| Mint, Garrett's | Dicerandra christmanii | Wherever found | 4 | E |
| Mint, Lakela's | Dicerandra immaculata | Wherever found | 4 | E |
| Mint, longspurred | Dicerandra cornutissima | Wherever found | 4 | E |
| Mint, scrub | Dicerandra frutescens | Wherever found | 4 | E |
| Monardella, willowy | Monardella viminea | Wherever found | 8 | E |
| monkey-flower, Michigan | Mimulus michiganensis | Wherever found | 3 | E |
| Monkeyflower, Vandenberg | Diplacus vandenbergensis | Wherever found | 8 | E |
| Monkshood, northern wild | Aconitum noveboracense | Wherever found | 3 | T |
| Morning-glory, Stebbins' | Calystegia stebbinsii | Wherever found | 8 | E |
| mountainbalm, Indian Knob | Eriodictyon altissimum | Wherever found | 8 | E |
| Mountain-mahogany, Catalina Island | Cercocarpus traskiae | Wherever found | 8 | E |
| Mustard, Carter's | Warea carteri | Wherever found | 4 | E |
| Mustard, Penland alpine fen | Eutrema penlandii | Wherever found | 6 | T |
| Mustard, slender-petaled | Thelypodium stenopetalum | Wherever found | 8 | E |
| Naenae | Dubautia kalalauensis | Wherever found | 1 | E |
| Naenae | Dubautia kenwoodii | Wherever found | 1 | E |
| Na`ena`e | Dubautia herbstobatae | Wherever found | 1 | E |
| Na`ena`e | Dubautia imbricata imbricata | Wherever found | 1 | E |
| Na`ena`e | Dubautia pauciflorula | Wherever found | 1 | E |
| Na`ena`e | Dubautia plantaginea magnifolia | Wherever found | 1 | E |
| Na`ena`e | Dubautia plantaginea ssp. humilis | Wherever found | 1 | E |
| Na`ena`e | Dubautia waialealae | Wherever found | 1 | E |
| Nani wai`ale`ale | Viola kauaiensis var. wahiawaensis | Wherever found | 1 | E |
| Nanu | Gardenia mannii | Wherever found | 1 | E |
| Nanu | Gardenia remyi | Wherever found | 1 | E |
| Naupaka, dwarf | Scaevola coriacea | Wherever found | 1 | E |
| Navarretia, few-flowered | Navarretia leucocephala ssp. pauciflora (=N. pauciflora) | Wherever found | 8 | E |
| Navarretia, many-flowered | Navarretia leucocephala ssp. plieantha | Wherever found | 8 | E |
| Navarretia, spreading | Navarretia fossalis | Wherever found | 8 | T |
| Nehe | Lipochaeta fauriei | Wherever found | 1 | E |
| Nehe | Lipochaeta kamolensis | Wherever found | 1 | E |
| Nehe | Lipochaeta lobata var. leptophylla | Wherever found | 1 | E |
| Nehe | Lipochaeta micrantha | Wherever found | 1 | E |
| Nehe | Lipochaeta waimeaensis | Wherever found | 1 | E |
| Nehe | Melanthera tenuifolia | Wherever found | 1 | E |
| Nioi | Eugenia koolauensis | Wherever found | 1 | E |
| Niterwort, Amargosa | Nitrophila mohavensis | Wherever found | 8 | E |
| No common name | Abutilon eremitopetalum | Wherever found | 1 | E |
| No common name | Abutilon sandwicense | Wherever found | 1 | E |
| No common name | Achyranthes mutica | Wherever found | 1 | E |
| No common name | Agave eggersiana | Wherever found | 4 | E |
| No common name | Amaranthus brownii | Wherever found | 1 | E |
| No common name | Aristida chaseae | Wherever found | 4 | E |
| No common name | Auerodendron pauciflorum | Wherever found | 4 | E |
| No common name | Bidens hillebrandiana ssp. hillebrandiana | Wherever found | 1 | E |
| No common name | Bonamia menziesii | Wherever found | 1 | E |
| No common name | Calyptranthes thomasiana | Wherever found | 4 | E |
| No common name | Catesbaea melanocarpa | Wherever found | 4 | E |
| No common name | Chamaecrista glandulosa var. mirabilis | Wherever found | 4 | E |
| No common name | Cordia bellonis | Wherever found | 4 | E |
| No common name | Cranichis ricartii | Wherever found | 4 | E |
| No common name | Cyanea kauaulaensis | Wherever found | 1 | E |
| No common name | Cyanea profuga | Wherever found | 1 | E |
| No common name | Cyanea purpurellifolia | Wherever found | 1 | E |
| No common name | Cyperus fauriei | Wherever found | 1 | E |
| No common name | Cyperus neokunthianus | Wherever found | 1 | E |
| No common name | Cyperus pennatiformis | Wherever found | 1 | E |
| No common name | Cyrtandra gracilis | Wherever found | 1 | E |
| No common name | Cyrtandra nanawaleensis | Wherever found | 1 | E |
| No common name | Cyrtandra wagneri | Wherever found | 1 | E |
| No common name | Cyrtandra waiolani | Wherever found | 1 | E |
| No common name | Daphnopsis hellerana | Wherever found | 4 | E |
| No common name | Delissea rhytidosperma | Wherever found | 1 | E |
| No common name | Delissea undulata | Wherever found | 1 | E |
| No common name | Dendrobium guamense | Wherever found | 1 | T |
| No common name | Eugenia bryanii | Wherever found | 1 | E |
| No common name | Eugenia woodburyana | Wherever found | 4 | E |
| No common name | Festuca hawaiiensis | Wherever found | 1 | E |
| No common name | Festuca molokaiensis | Wherever found | 1 | E |
| No common name | Geocarpon minimum | Wherever found | 4 | T |
| No common name | Gesneria pauciflora | Wherever found | 4 | T |
| No common name | Gonocalyx concolor | Wherever found | 4 | E |
| No common name | Gouania hillebrandii | Wherever found | 1 | E |
| No common name | Gouania meyenii | Wherever found | 1 | E |
| No common name | Gouania vitifolia | Wherever found | 1 | E |
| No common name | Hesperomannia arborescens | Wherever found | 1 | E |
| No common name | Hesperomannia arbuscula | Wherever found | 1 | E |
| No common name | Hesperomannia lydgatei | Wherever found | 1 | E |
| No common name | Ilex sintenisii | Wherever found | 4 | E |
| No common name | Kadua degeneri | Wherever found | 1 | E |
| No common name | Kadua haupuensis | Wherever found | 1 | E |
| No common name | Kadua parvula | Wherever found | 1 | E |
| No common name | Kadua st.-johnii | Wherever found | 1 | E |
| No common name | Keysseria (=Lagenifera) erici | Wherever found | 1 | E |
| No common name | Keysseria (=Lagenifera) helenae | Wherever found | 1 | E |
| No common name | Labordia lorenciana | Wherever found | 1 | E |
| No common name | Lepanthes eltoroensis | Wherever found | 4 | E |
| No common name | Lepidium orbiculare | Wherever found | 1 | E |
| No common name | Leptocereus grantianus | Wherever found | 4 | E |
| No common name | Lipochaeta venosa | Wherever found | 1 | E |
| No common name | Lobelia koolauensis | Wherever found | 1 | E |
| No common name | Lobelia monostachya | Wherever found | 1 | E |
| No common name | Lobelia niihauensis | Wherever found | 1 | E |
| No common name | Lobelia oahuensis | Wherever found | 1 | E |
| No common name | Lyonia truncata var. proctorii | Wherever found | 4 | E |
| No common name | Lysimachia filifolia | Wherever found | 1 | E |
| No common name | Lysimachia iniki | Wherever found | 1 | E |
| No common name | Lysimachia lydgatei | Wherever found | 1 | E |
| No common name | Lysimachia maxima | Wherever found | 1 | E |
| No common name | Lysimachia pendens | Wherever found | 1 | E |
| No common name | Lysimachia scopulensis | Wherever found | 1 | E |
| No common name | Lysimachia venosa | Wherever found | 1 | E |
| No common name | Maesa walkeri | Wherever found | 1 | T |
| No common name | Mitracarpus maxwelliae | Wherever found | 4 | E |
| No common name | Mitracarpus polycladus | Wherever found | 4 | E |
| No common name | Myrcia paganii | Wherever found | 4 | E |
| No common name | Neraudia angulata | Wherever found | 1 | E |
| No common name | Neraudia ovata | Wherever found | 1 | E |
| No common name | Neraudia sericea | Wherever found | 1 | E |
| No common name | Nervilia jacksoniae | Wherever found | 1 | T |
| No common name | Nesogenes rotensis | Wherever found | 1 | E |
| No common name | Osmoxylon mariannense | Wherever found | 1 | E |
| No common name | Phyllanthus saffordii | Wherever found | 1 | E |
| No common name | Phyllostegia bracteata | Wherever found | 1 | E |
| No common name | Phyllostegia brevidens | Wherever found | 1 | E |
| No common name | Phyllostegia floribunda | Wherever found | 1 | E |
| No common name | Phyllostegia glabra var. lanaiensis | Wherever found | 1 | E |
| No common name | Phyllostegia haliakalae | Wherever found | 1 | E |
| No common name | Phyllostegia helleri | Wherever found | 1 | E |
| No common name | Phyllostegia hirsuta | Wherever found | 1 | E |
| No common name | Phyllostegia hispida | Wherever found | 1 | E |
| No common name | Phyllostegia kaalaensis | Wherever found | 1 | E |
| No common name | Phyllostegia knudsenii | Wherever found | 1 | E |
| No common name | Phyllostegia mannii | Wherever found | 1 | E |
| No common name | Phyllostegia mollis | Wherever found | 1 | E |
| No common name | Phyllostegia parviflora | Wherever found | 1 | E |
| No common name | Phyllostegia pilosa | Wherever found | 1 | E |
| No common name | Phyllostegia renovans | Wherever found | 1 | E |
| No common name | Phyllostegia stachyoides | Wherever found | 1 | E |
| No common name | Phyllostegia velutina | Wherever found | 1 | E |
| No common name | Phyllostegia waimeae | Wherever found | 1 | E |
| No common name | Phyllostegia warshaueri | Wherever found | 1 | E |
| No common name | Phyllostegia wawrana | Wherever found | 1 | E |
| No common name | Pittosporum halophilum | Wherever found | 1 | E |
| No common name | Pittosporum hawaiiense | Wherever found | 1 | E |
| No common name | Platanthera holochila | Wherever found | 1 | E |
| No common name | Platydesma cornuta cornuta | Wherever found | 1 | E |
| No common name | Platydesma cornuta decurrens | Wherever found | 1 | E |
| No common name | Platydesma remyi | Wherever found | 1 | E |
| No common name | Poa siphonoglossa | Wherever found | 1 | E |
| No common name | Polyscias bisattenuata | Wherever found | 1 | E |
| No common name | Polyscias flynnii | Wherever found | 1 | E |
| No common name | Polyscias lydgatei | Wherever found | 1 | E |
| No common name | Polyscias racemosa | Wherever found | 1 | E |
| No common name | Pritchardia bakeri | Wherever found | 1 | E |
| No common name | Remya kauaiensis | Wherever found | 1 | E |
| No common name | Remya montgomeryi | Wherever found | 1 | E |
| No common name | Sanicula mariversa | Wherever found | 1 | E |
| No common name | Sanicula purpurea | Wherever found | 1 | E |
| No common name | Sanicula sandwicensis | Wherever found | 1 | E |
| No common name | Santalum involutum | Wherever found | 1 | E |
| No common name | Schiedea attenuata | Wherever found | 1 | E |
| No common name | Schiedea diffusa ssp. macraei | Wherever found | 1 | E |
| No common name | Schiedea diffusa subsp. diffusa | Wherever found | 1 | E |
| No common name | Schiedea haleakalensis | Wherever found | 1 | E |
| No common name | Schiedea helleri | Wherever found | 1 | E |
| No common name | Schiedea hookeri | Wherever found | 1 | E |
| No common name | Schiedea jacobii | Wherever found | 1 | E |
| No common name | Schiedea kaalae | Wherever found | 1 | E |
| No common name | Schiedea kauaiensis | Wherever found | 1 | E |
| No common name | Schiedea laui | Wherever found | 1 | E |
| No common name | Schiedea lydgatei | Wherever found | 1 | E |
| No common name | Schiedea membranacea | Wherever found | 1 | E |
| No common name | Schiedea nuttallii | Wherever found | 1 | E |
| No common name | Schiedea obovata | Wherever found | 1 | E |
| No common name | Schiedea salicaria | Wherever found | 1 | E |
| No common name | Schiedea sarmentosa | Wherever found | 1 | E |
| No common name | Schiedea spergulina var. leiopoda | Wherever found | 1 | E |
| No common name | Schiedea spergulina var. spergulina | Wherever found | 1 | T |
| No common name | Schiedea trinervis | Wherever found | 1 | E |
| No common name | Schiedea verticillata | Wherever found | 1 | E |
| No common name | Schiedea viscosa | Wherever found | 1 | E |
| No common name | Schoepfia arenaria | Wherever found | 4 | T |
| No common name | Sicyos lanceoloideus | Wherever found | 1 | E |
| No common name | Silene alexandri | Wherever found | 1 | E |
| No common name | Silene hawaiiensis | Wherever found | 1 | T |
| No common name | Silene lanceolata | Wherever found | 1 | E |
| No common name | Silene perlmanii | Wherever found | 1 | E |
| No common name | Spermolepis hawaiiensis | Wherever found | 1 | E |
| No common name | Stenogyne angustifolia angustifolia | Wherever found | 1 | E |
| No common name | Stenogyne bifida | Wherever found | 1 | E |
| No common name | Stenogyne campanulata | Wherever found | 1 | E |
| No common name | Stenogyne cranwelliae | Wherever found | 1 | E |
| No common name | Stenogyne kaalae ssp. sherffii | Wherever found | 1 | E |
| No common name | Stenogyne kanehoana | Wherever found | 1 | E |
| No common name | Stenogyne kauaulaensis | Wherever found | 1 | E |
| No common name | Stenogyne kealiae | Wherever found | 1 | E |
| No common name | Tabernaemontana rotensis | Wherever found | 1 | T |
| No common name | Ternstroemia subsessilis | Wherever found | 4 | E |
| No common name | Tetramolopium arenarium | Wherever found | 1 | E |
| No common name | Tetramolopium filiforme | Wherever found | 1 | E |
| No common name | Tetramolopium lepidotum ssp. lepidotum | Wherever found | 1 | E |
| No common name | Tetramolopium remyi | Wherever found | 1 | E |
| No common name | Tetramolopium rockii | Wherever found | 1 | T |
| No Common Name | Tinospora homosepala | Wherever found | 1 | E |
| No common name | Trematolobelia singularis | Wherever found | 1 | E |
| No common name | Tuberolabium guamense | Wherever found | 1 | T |
| No common name | Varronia rupicola | Wherever found | 4 | T |
| No common name | Vernonia proctorii | Wherever found | 4 | E |
| No common name | Vigna o-wahuensis | Wherever found | 1 | E |
| No common name | Viola helenae | Wherever found | 1 | E |
| No common name | Viola lanaiensis | Wherever found | 1 | E |
| No common name | Viola oahuensis | Wherever found | 1 | E |
| No common name | Wikstroemia skottsbergiana | Wherever found | 1 | E |
| No common name | Wikstroemia villosa | Wherever found | 1 | E |
| No common name | Xylosma crenatum | Wherever found | 1 | E |
| Nohoanu | Geranium hanaense | Wherever found | 1 | E |
| Nohoanu | Geranium hillebrandii | Wherever found | 1 | E |
| Nohoanu | Geranium kauaiense | Wherever found | 1 | E |
| Nohoanu | Geranium multiflorum | Wherever found | 1 | E |
| nui, haha | Cyanea horrida | Wherever found | 1 | E |
| Oak, Hinckley | Quercus hinckleyi | Wherever found | 2 | T |
| Oha | Delissea subcordata | Wherever found | 1 | E |
| Ohai | Sesbania tomentosa | Wherever found | 1 | E |
| `Oha wai | Clermontia drepanomorpha | Wherever found | 1 | E |
| `Oha wai | Clermontia lindseyana | Wherever found | 1 | E |
| `Oha wai | Clermontia oblongifolia ssp. brevipes | Wherever found | 1 | E |
| `Oha wai | Clermontia oblongifolia ssp. mauiensis | Wherever found | 1 | E |
| `Oha wai | Clermontia peleana | Wherever found | 1 | E |
| `Oha wai | Clermontia pyrularia | Wherever found | 1 | E |
| `Oha wai | Clermontia samuelii | Wherever found | 1 | E |
| `Ohe | Joinvillea ascendens ascendens | Wherever found | 1 | E |
| `Ohe`ohe | Polyscias gymnocarpa | Wherever found | 1 | E |
| Olulu | Brighamia insignis | Wherever found | 1 | E |
| Onion, Munz's | Allium munzii | Wherever found | 8 | E |
| Opuhe | Urera kaalae | Wherever found | 1 | E |
| Orchid, eastern prairie fringed | Platanthera leucophaea | Wherever found | 3 | T |
| Orchid, western prairie fringed | Platanthera praeclara | Wherever found | 3 | T |
| Orchid, white fringeless | Platanthera integrilabia | Wherever found | 4 | T |
| Orcutt grass, California | Orcuttia californica | Wherever found | 8 | E |
| Orcutt grass, hairy | Orcuttia pilosa | Wherever found | 8 | E |
| Orcutt grass, Sacramento | Orcuttia viscida | Wherever found | 8 | E |
| Orcutt grass, San Joaquin | Orcuttia inaequalis | Wherever found | 8 | T |
| Orcutt grass, slender | Orcuttia tenuis | Wherever found | 8 | T |
| Owl's-clover, fleshy | Castilleja campestris ssp. succulenta | Wherever found | 8 | T |
| Oxytheca, cushenbury | Oxytheca parishii var. goodmaniana | Wherever found | 8 | E |
| Pa`iniu | Astelia waialealae | Wherever found | 1 | E |
| Paintbrush, ash-grey | Castilleja cinerea | Wherever found | 8 | T |
| paintbrush, golden | Castilleja levisecta | Wherever found | 1 | T |
| Paintbrush, soft-leaved | Castilleja mollis | Wherever found | 8 | E |
| Paintbrush, Tiburon | Castilleja affinis ssp. neglecta | Wherever found | 8 | E |
| Palo colorado | Ternstroemia luquillensis | Wherever found | 4 | E |
| Palo de jazmin | Styrax portoricensis | Wherever found | 4 | E |
| Palo de nigua | Cornutia obovata | Wherever found | 4 | E |
| Palo de ramon | Banara vanderbiltii | Wherever found | 4 | E |
| Palo de rosa | Ottoschulzia rhodoxylon | Wherever found | 4 | E |
| Pamakani | Tetramolopium capillare | Wherever found | 1 | E |
| Pamakani | Viola chamissoniana ssp. chamissoniana | Wherever found | 1 | E |
| Panicgrass, Carter's | Panicum fauriei var. carteri | Wherever found | 1 | E |
| Papala | Charpentiera densiflora | Wherever found | 1 | E |
| Paudedo | Hedyotis megalantha | Wherever found | 1 | E |
| Pawpaw, beautiful | Deeringothamnus pulchellus | Wherever found | 4 | E |
| Pawpaw, four-petal | Asimina tetramera | Wherever found | 4 | E |
| Pawpaw, Rugel's | Deeringothamnus rugelii | Wherever found | 4 | E |
| Pea, Big Pine partridge | Chamaecrista lineata keyensis | Wherever found | 4 | E |
| Pelos del diablo | Aristida portoricensis | Wherever found | 4 | E |
| Penny-cress, Kneeland Prairie | Thlaspi californicum | Wherever found | 8 | E |
| Pennyroyal, Todsen's | Hedeoma todsenii | Wherever found | 2 | E |
| Penstemon, blowout | Penstemon haydenii | Wherever found | 6 | E |
| Pentachaeta, Lyon's | Pentachaeta lyonii | Wherever found | 8 | E |
| Pentachaeta, white-rayed | Pentachaeta bellidiflora | Wherever found | 8 | E |
| Peperomia, Wheeler's | Peperomia wheeleri | Wherever found | 4 | E |
| Peppergrass, Slickspot | Lepidium papilliferum | Entire | 1 | T |
| Phacelia, clay | Phacelia argillacea | Wherever found | 6 | E |
| Phacelia, DeBeque | Phacelia submutica | Wherever found | 6 | T |
| Phacelia, island | Phacelia insularis ssp. insularis | Wherever found | 8 | E |
| Phacelia, North Park | Phacelia formosula | Wherever found | 6 | E |
| Phlox, Texas trailing | Phlox nivalis ssp. texensis | Wherever found | 2 | E |
| Phlox, Yreka | Phlox hirsuta | Wherever found | 8 | E |
| Pigeon wings | Clitoria fragrans | Wherever found | 4 | T |
| Pilo | Hedyotis mannii | Wherever found | 1 | E |
| Pilo kea lau li`i | Platydesma rostrata | Wherever found | 1 | E |
| Pinkroot, gentian | Spigelia gentianoides | Wherever found | 4 | E |
| Pink, swamp | Helonias bullata | Wherever found | 5 | T |
| Piperia, Yadon's | Piperia yadonii | Wherever found | 8 | E |
| Pitaya, Davis' green | Echinocereus viridiflorus var. davisii | Wherever found | 2 | E |
| Pitcher-plant, Alabama canebrake | Sarracenia rubra ssp. alabamensis | Wherever found | 4 | E |
| Pitcher-plant, green | Sarracenia oreophila | Wherever found | 4 | E |
| Pitcher-plant, mountain sweet | Sarracenia rubra ssp. jonesii | Wherever found | 4 | E |
| Plum, scrub | Prunus geniculata | Wherever found | 4 | E |
| Po`e | Portulaca sclerocarpa | Wherever found | 1 | E |
| Pogonia, small whorled | Isotria medeoloides | Wherever found | 5 | T |
| Polygala, Lewton's | Polygala lewtonii | Wherever found | 4 | E |
| Polygala, tiny | Polygala smallii | Wherever found | 4 | E |
| Polygonum, Scotts Valley | Polygonum hickmanii | Wherever found | 8 | E |
| Pondberry | Lindera melissifolia | Wherever found | 4 | E |
| Pondweed, Little Aguja (=Creek) | Potamogeton clystocarpus | Wherever found | 2 | E |
| popcornflower, rough | Plagiobothrys hirtus | Wherever found | 1 | E |
| Popolo | Cyanea solanacea | Wherever found | 1 | E |
| Popolo | Solanum nelsonii | Wherever found | 1 | E |
| Popolo ku mai | Solanum incompletum | Wherever found | 1 | E |
| Poppy-mallow, Texas | Callirhoe scabriuscula | Wherever found | 2 | E |
| Poppy, Sacramento prickly | Argemone pleiacantha ssp. pinnatisecta | Wherever found | 2 | E |
| Potato-bean, Price's | Apios priceana | Wherever found | 4 | T |
| Potentilla, Hickman's | Potentilla hickmanii | Wherever found | 8 | E |
| Prairie-clover, leafy | Dalea foliosa | Wherever found | 4 | E |
| Prickly-apple, aboriginal | Harrisia (=Cereus) aboriginum (=gracilis) | Wherever found | 4 | E |
| Prickly-apple, fragrant | Cereus eriophorus var. fragrans | Wherever found | 4 | E |
| Prickly-ash, St. Thomas | Zanthoxylum thomasianum | Wherever found | 4 | E |
| Primrose, Maguire | Primula maguirei | Wherever found | 6 | T |
| Pua `ala | Brighamia rockii | Wherever found | 1 | E |
| Pussypaws, Mariposa | Calyptridium pulchellum | Wherever found | 8 | T |
| Pu`uka`a | Cyperus trachysanthos | Wherever found | 1 | E |
| Ragwort, San Francisco Peaks | Packera franciscana | Wherever found | 2 | T |
| Rattleweed, hairy | Baptisia arachnifera | Wherever found | 4 | E |
| Reedgrass, Hillegrand's | Calamagrostis hillebrandii | Wherever found | 1 | E |
| Reedgrass, Maui | Calamagrostis expansa | Wherever found | 1 | E |
| Reed-mustard, Barneby | Schoenocrambe barnebyi | Wherever found | 6 | E |
| Reed-mustard, clay | Schoenocrambe argillacea | Wherever found | 6 | T |
| Reed-mustard, shrubby | Schoenocrambe suffrutescens | Wherever found | 6 | E |
| Remya, Maui | Remya mauiensis | Wherever found | 1 | E |
| Rhododendron, Chapman | Rhododendron chapmanii | Wherever found | 4 | E |
| Ridge-cress, Barneby | Lepidium barnebyanum | Wherever found | 6 | E |
| Rock-cress, Braun's | Arabis perstellata | Wherever found | 4 | E |
| Rockcress, Georgia | Arabis georgiana | Wherever found | 4 | T |
| Rock-cress, Hoffmann's | Arabis hoffmannii | Wherever found | 8 | E |
| Rock-cress, McDonald's | Arabis macdonaldiana | Wherever found | 8 | E |
| Rockcress, Santa Cruz Island | Sibara filifolia | Wherever found | 8 | E |
| rock cress, Shale barren | Arabis serotina | Wherever found | 5 | E |
| Rose-mallow, Neches River | Hibiscus dasycalyx | Wherever found | 2 | T |
| Rosemary, Apalachicola | Conradina glabra | Wherever found | 4 | E |
| Rosemary, Cumberland | Conradina verticillata | Wherever found | 4 | T |
| Rosemary, Etonia | Conradina etonia | Wherever found | 4 | E |
| Rosemary, short-leaved | Conradina brevifolia | Wherever found | 4 | E |
| roseroot, Leedy's | Rhodiola integrifolia ssp. leedyi | Wherever found | 3 | T |
| Rush-pea, slender | Hoffmannseggia tenella | Wherever found | 2 | E |
| Rush-rose, island | Helianthemum greenei | Wherever found | 8 | T |
| Sandalwood, Lanai (=`iliahi) | Santalum haleakalae var. lanaiense | Wherever found | 1 | E |
| Sandlace | Polygonella myriophylla | Wherever found | 4 | E |
| Sand-verbena, large-fruited | Abronia macrocarpa | Wherever found | 2 | E |
| Sandwort, Bear Valley | Arenaria ursina | Wherever found | 8 | T |
| Sandwort, Cumberland | Arenaria cumberlandensis | Wherever found | 4 | E |
| Sandwort, Marsh | Arenaria paludicola | Wherever found | 8 | E |
| Schiedea, Diamond Head | Schiedea adamantis | Wherever found | 1 | E |
| Seablite, California | Suaeda californica | Wherever found | 8 | E |
| Seagrass, Johnson's | Halophila johnsonii | Wherever found | NMFS | T |
| Sedge, golden | Carex lutea | Wherever found | 4 | E |
| Sedge, Navajo | Carex specuicola | Wherever found | 2 | T |
| Sedge, white | Carex albida | Wherever found | 8 | E |
| silverbush, Blodgett's | Argythamnia blodgettii | Wherever found | 4 | T |
| Silversword, Mauna Loa (=Ka'u) | Argyroxiphium kauense | Wherever found | 1 | E |
| Skullcap, Florida | Scutellaria floridana | Wherever found | 4 | T |
| Skullcap, large-flowered | Scutellaria montana | Wherever found | 4 | T |
| Skyrocket, Pagosa | Ipomopsis polyantha | Wherever found | 6 | E |
| Snakeroot | Eryngium cuneifolium | Wherever found | 4 | E |
| Sneezeweed, Virginia | Helenium virginicum | Wherever found | 5 | T |
| Snowbells, Texas | Styrax texanus | Wherever found | 2 | E |
| Spineflower, Ben Lomond | Chorizanthe pungens var. hartwegiana | Wherever found | 8 | E |
| Spineflower, Howell's | Chorizanthe howellii | Wherever found | 8 | E |
| Spineflower, Monterey | Chorizanthe pungens var. pungens | Wherever found | 8 | T |
| Spineflower, Orcutt's | Chorizanthe orcuttiana | Wherever found | 8 | E |
| spineflower, Robust | Chorizanthe robusta var. robusta | Wherever found | 8 | E |
| spineflower, Scotts Valley | Chorizanthe robusta var. hartwegii | Wherever found | 8 | E |
| Spineflower, slender-horned | Dodecahema leptoceras | Wherever found | 8 | E |
| Spineflower, Sonoma | Chorizanthe valida | Wherever found | 8 | E |
| Spiraea, Virginia | Spiraea virginiana | Wherever found | 5 | T |
| Spurge, deltoid | Chamaesyce deltoidea ssp. deltoidea | Wherever found | 4 | E |
| Spurge, Garber's | Chamaesyce garberi | Wherever found | 4 | T |
| Spurge, Hoover's | Chamaesyce hooveri | Wherever found | 8 | T |
| Spurge, telephus | Euphorbia telephioides | Wherever found | 4 | T |
| Spurge, wedge | Chamaesyce deltoidea serpyllum | Wherever found | 4 | E |
| Stickseed, showy | Hackelia venusta | Wherever found | 1 | E |
| Stonecrop, Lake County | Parvisedum leiocarpum | Wherever found | 8 | E |
| Sumac, Michaux's | Rhus michauxii | Wherever found | 4 | E |
| Sunburst, Hartweg's golden | Pseudobahia bahiifolia | Wherever found | 8 | E |
| Sunburst, San Joaquin adobe | Pseudobahia peirsonii | Wherever found | 8 | T |
| Sunflower, Pecos (=puzzle, =paradox) | Helianthus paradoxus | Wherever found | 2 | T |
| Sunflower, San Mateo woolly | Eriophyllum latilobum | Wherever found | 8 | E |
| Sunflower, Schweinitz's | Helianthus schweinitzii | Wherever found | 4 | E |
| Sunflower, whorled | Helianthus verticillatus | Wherever found | 4 | E |
| Sunray, Ash Meadows | Enceliopsis nudicaulis var. corrugata | Wherever found | 8 | T |
| Sunshine, Sonoma | Blennosperma bakeri | Wherever found | 8 | E |
| Taraxacum, California | Taraxacum californicum | Wherever found | 8 | E |
| Tarplant, Gaviota | Deinandra increscens ssp. villosa | Wherever found | 8 | E |
| Tarplant, Otay | Deinandra (=Hemizonia) conjugens | Wherever found | 8 | T |
| Tarplant, Santa Cruz | Holocarpha macradenia | Wherever found | 8 | T |
| Thelypody, Howell's spectacular | Thelypodium howellii spectabilis | Wherever found | 1 | T |
| Thistle, Chorro Creek bog | Cirsium fontinale var. obispoense | Wherever found | 8 | E |
| Thistle, fountain | Cirsium fontinale var. fontinale | Wherever found | 8 | E |
| Thistle, La Graciosa | Cirsium loncholepis | Wherever found | 8 | E |
| Thistle, Loch Lomond coyote | Eryngium constancei | Wherever found | 8 | E |
| Thistle, Pitcher's | Cirsium pitcheri | Wherever found | 3 | T |
| Thistle, Sacramento Mountains | Cirsium vinaceum | Wherever found | 2 | T |
| Thistle, Suisun | Cirsium hydrophilum var. hydrophilum | Wherever found | 8 | E |
| Thornmint, San Diego | Acanthomintha ilicifolia | Wherever found | 8 | T |
| Thornmint, San Mateo | Acanthomintha obovata ssp. duttonii | Wherever found | 8 | E |
| Thoroughwort, Cape Sable | Chromolaena frustrata | Wherever found | 4 | E |
| Townsendia, Last Chance | Townsendia aprica | Wherever found | 6 | T |
| Trillium, persistent | Trillium persistens | Wherever found | 4 | E |
| Trillium, relict | Trillium reliquum | Wherever found | 4 | E |
| Tuctoria, Greene's | Tuctoria greenei | Wherever found | 8 | E |
| Twinpod, Dudley Bluffs | Physaria obcordata | Wherever found | 6 | T |
| Ufa-halomtano | Heritiera longipetiolata | Wherever found | 1 | E |
| Uhi uhi | Mezoneuron kavaiense | Wherever found | 1 | E |
| Uvillo | Eugenia haematocarpa | Wherever found | 4 | E |
| Vervain, Red Hills | Verbena californica | Wherever found | 8 | T |
| Vetch, Hawaiian | Vicia menziesii | Wherever found | 1 | E |
| Wahane | Pritchardia aylmer-robinsonii | Wherever found | 1 | E |
| Wallflower, Ben Lomond | Erysimum teretifolium | Wherever found | 8 | E |
| Wallflower, Contra Costa | Erysimum capitatum var. angustatum | Wherever found | 8 | E |
| Wallflower, Menzies' | Erysimum menziesii | Wherever found | 8 | E |
| Walnut (=Nogal), West Indian | Juglans jamaicensis | Wherever found | 4 | E |
| Warea, wide-leaf | Warea amplexifolia | Wherever found | 4 | E |
| Watercress, Gambel's | Rorippa gambellii | Wherever found | 8 | E |
| Water-plantain, Kral's | Sagittaria secundifolia | Wherever found | 4 | T |
| Water-umbel, Huachuca | Lilaeopsis schaffneriana var. recurva | Wherever found | 2 | E |
| Water-willow, Cooley's | Justicia cooleyi | Wherever found | 4 | E |
| Whitlow-wort, papery | Paronychia chartacea | Wherever found | 4 | T |
| wild buckwheat, clay-loving | Eriogonum pelinophilum | Wherever found | 6 | E |
| Wild-buckwheat, gypsum | Eriogonum gypsophilum | Wherever found | 2 | T |
| Wild-buckwheat, southern mountain | Eriogonum kennedyi var. austromontanum | Wherever found | 8 | T |
| wild coffee, Oahu (=kopiko) | Psychotria hexandra ssp. oahuensis | Wherever found | 1 | E |
| Wild-rice, Texas | Zizania texana | Wherever found | 2 | E |
| Wire-lettuce, Malheur | Stephanomeria malheurensis | Wherever found | 1 | E |
| Wireweed | Polygonella basiramia | Wherever found | 4 | E |
| Woodland-star, San Clemente Island | Lithophragma maximum | Wherever found | 8 | E |
| Woolly-star, Santa Ana River | Eriastrum densifolium ssp. sanctorum | Wherever found | 8 | E |
| Wooly-threads, San Joaquin | Monolopia (=Lembertia) congdonii | Wherever found | 8 | E |
| Yellowhead, desert | Yermo xanthocephalus | Wherever found | 6 | T |
| Yerba santa, Lompoc | Eriodictyon capitatum | Wherever found | 8 | E |
| Ziziphus, Florida | Ziziphus celata | Wherever found | 4 | E |
