May 15, 2009

Endangered Plants

Scientific Name Inverted Common Name Species Group Historic Range Family Listing Status
Abies guatemalensis Fir, Guatemalan (=pinabete) Conifers and Cycads Mexico, Guatemala, Honduras, El Salvador Pinaceae Threatened
Abronia macrocarpa Sand-verbena, large-fruited Flowering Plants U.S.A. (TX) Nyctaginaceae Endangered
Abutilon eremitopetalum No common name Flowering Plants U.S.A. (HI) Malvaceae Endangered
Abutilon menziesii Ko`oloa`ula Flowering Plants U.S.A. (HI) Malvaceae Endangered
Abutilon sandwicense No common name Flowering Plants U.S.A. (HI) Malvaceae Endangered
Acaena exigua Liliwai Flowering Plants U.S.A. (HI) Rosaceae Endangered
Acanthomintha ilicifolia Thornmint, San Diego Flowering Plants U.S.A. (CA), Mexico Lamiaceae Threatened
Acanthomintha obovata ssp. duttonii Thornmint, San Mateo Flowering Plants U.S.A. (CA) Lamiaceae Endangered
Achyranthes mutica No common name Flowering Plants U.S.A. (HI) Amaranthaceae Endangered
Achyranthes splendens var. rotundata Chaff-flower, round-leaved Flowering Plants U.S.A. (HI) Amaranthaceae Endangered
Aconitum noveboracense Monkshood, northern wild Flowering Plants U.S.A. (IA, NY, OH, WI) Ranunculaceae Threatened
Adenophorus periens Fern, pendant kihi Ferns and Allies U.S.A. (HI) Grammitidaceae Endangered
Adiantum vivesii No common name Ferns and Allies U.S.A. (PR) Adiantaceae Endangered
Aeschynomene virginica Joint-vetch, sensitive Flowering Plants U.S.A. (DE, MD, NC, NJ, PA, VA) Fabaceae Threatened
Agalinis acuta Gerardia, sandplain Flowering Plants U.S.A. (CT, MA, MD, NY, RI) Scrophulariaceae Endangered
Alectryon macrococcus Mahoe Flowering Plants U.S.A. (HI) Sapindaceae Endangered
Allium munzii Onion, Munz's Flowering Plants U.S.A. (CA) Liliaceae Endangered
Alopecurus aequalis var. sonomensis Alopecurus, Sonoma Flowering Plants U.S.A. (CA) Poaceae Endangered
Alsinidendron lychnoides Kuawawaenohu Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Alsinidendron obovatum No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Alsinidendron trinerve No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Alsinidendron viscosum No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Amaranthus brownii No common name Flowering Plants U.S.A. (HI) Amaranthaceae Endangered
Amaranthus pumilus Amaranth, seabeach Flowering Plants U.S.A. (DE, MA, MD, NC, NJ, NY, RI, SC, VA) Amaranthaceae Threatened
Ambrosia cheiranthifolia Ambrosia, south Texas Flowering Plants U.S.A. (TX) Asteraceae Endangered
Ambrosia pumila Ambrosia, San Diego Flowering Plants U.S.A. (CA), Mexico Asteraceae Endangered
Amorpha crenulata Lead-plant, Crenulate Flowering Plants U.S.A. (FL) Fabaceae Endangered
Amphianthus pusillus Amphianthus, little Flowering Plants U.S.A. (AL, GA, SC) Scrophulariaceae Threatened
Amsinckia grandiflora Fiddleneck, large-flowered Flowering Plants U.S.A. (CA) Boraginaceae Endangered
Amsonia kearneyana Blue-star, Kearney's Flowering Plants U.S.A. (AZ) Apocynaceae Endangered
Ancistrocactus tobuschii Cactus, Tobusch fishhook Flowering Plants U.S.A. (TX) Cactaceae Endangered
Apios priceana Potato-bean, Price's Flowering Plants U.S.A. (AL, IL, KY, MS, TN) Fabaceae Threatened
Arabis hoffmannii Rock-cress, Hoffmann's Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Arabis mcdonaldiana Rock-cress, McDonald's Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Arabis perstellata Rock-cress, Braun's Flowering Plants U.S.A. (KY,TN) Brassicaceae Endangered
Arabis serotina Rock-cress, shale barren Flowering Plants U.S.A. (VA, WV) Brassicaceae Endangered
Arctomecon humilis Bear-poppy, dwarf Flowering Plants U.S.A. (UT) Papaveraceae Endangered
Arctostaphylos confertiflora Manzanita, Santa Rosa Island Flowering Plants U.S.A. (CA) Ericaceae Endangered
Arctostaphylos glandulosa ssp. crassifolia Manzanita, Del Mar Flowering Plants U.S.A. (CA), Mexico. Ericaceae Endangered
Arctostaphylos hookeri var. ravenii Manzanita, Presidio Flowering Plants U.S.A. (CA) Ericaceae Endangered
Arctostaphylos morroensis Manzanita, Morro Flowering Plants U.S.A. (CA) Ericaceae Threatened
Arctostaphylos myrtifolia Manzanita, Ione Flowering Plants U.S.A. (CA) Ericaceae Threatened
Arctostaphylos pallida Manzanita, pallid Flowering Plants U.S.A. (CA) Ericaceae Threatened
Arenaria cumberlandensis Sandwort, Cumberland Flowering Plants U.S.A. (KY, TN) Caryophyllaceae Endangered
Arenaria paludicola Sandwort, Marsh Flowering Plants U.S.A. (CA) Caryophyllaceae Endangered
Arenaria ursina Sandwort, Bear Valley Flowering Plants U.S.A. (CA) Caryophyllaceae Threatened
Argemone pleiacantha ssp. pinnatisecta Poppy, Sacramento prickly Flowering Plants U.S.A. (NM) Papaveraceae Endangered
Argyroxiphium kauense Silversword, Mauna Loa (=Ka'u) Flowering Plants U.S.A. (HI) Asteraceae Endangered
Argyroxiphium sandwicense ssp. macrocephalum `Ahinahina Flowering Plants U.S.A. (HI) Asteraceae Threatened
Argyroxiphium sandwicense ssp. sandwicense `Ahinahina Flowering Plants U.S.A. (HI) Asteraceae Endangered
Aristida chaseae No common name Flowering Plants U.S.A. (PR) Poaceae Endangered
Aristida portoricensis Pelos del diablo Flowering Plants U.S.A. (PR) Poaceae Endangered
Asclepias meadii Milkweed, Mead's Flowering Plants U.S.A. (IA, IL, IN, KS, MO, WI) Asclepiadaceae Threatened
Asclepias welshii Milkweed, Welsh's Flowering Plants U.S.A. (AZ, UT) Asclepiadaceae Threatened
Asimina tetramera Pawpaw, four-petal Flowering Plants U.S.A. (FL) Annonaceae Endangered
Asplenium fragile var. insulare No common name Ferns and Allies U.S.A. (HI) Aspleniaceae Endangered
Asplenium scolopendrium var. americanum Fern, American hart's-tongue Ferns and Allies U.S.A. (AL, MI, NY, TN), Canada (Ont.) Aspleniaceae Threatened
Astragalus albens Milk-vetch, Cushenbury Flowering Plants U.S.A. (CA) Fabaceae Endangered
Astragalus ampullarioides Milk-vetch, Shivwits Flowering Plants U.S.A. (UT) Fabaceae Endangered
Astragalus applegatei Milk-vetch, Applegate's Flowering Plants U.S.A. (OR) Fabaceae Endangered
Astragalus bibullatus Ground-plum, Guthrie's (=Pyne's) Flowering Plants U.S.A. (TN) Fabaceae Endangered
Astragalus brauntonii Milk-vetch, Braunton's Flowering Plants U.S.A. (CA) Fabaceae Endangered
Astragalus clarianus Milk-vetch, Clara Hunt's Flowering Plants U.S.A. (CA) Fabaceae Endangered
Astragalus cremnophylax var. cremnophylax Milk-vetch, Sentry Flowering Plants U.S.A. (AZ) Fabaceae Endangered
Astragalus desereticus Milk-vetch, Deseret Flowering Plants U.S.A. (UT) Fabaceae Threatened
Astragalus holmgreniorum Milk-vetch, Holmgren Flowering Plants U.S.A. (AZ, UT) Fabaceae Endangered
Astragalus humillimus Milk-vetch, Mancos Flowering Plants U.S.A. (CO, NM) Fabaceae Endangered
Astragalus jaegerianus Milk-vetch, Lane Mountain Flowering Plants U.S.A. (CA) Fabaceae Endangered
Astragalus lentiginosus var. coachellae Milk-vetch, Coachella Valley Flowering Plants U.S.A. (CA) Fabaceae Endangered
Astragalus lentiginosus var. piscinensis Milk-vetch, Fish Slough Flowering Plants U.S.A. (CA) Fabaceae Threatened
Astragalus magdalenae var. peirsonii Milk-vetch, Peirson's Flowering Plants U.S.A. (CA) Fabaceae Threatened
Astragalus montii Milk-vetch, heliotrope Flowering Plants U.S.A. (UT) Fabaceae Threatened
Astragalus osterhoutii Milk-vetch, Osterhout Flowering Plants U.S.A. (CO) Fabaceae Endangered
Astragalus phoenix Milk-vetch, Ash meadows Flowering Plants U.S.A. (NV) Fabaceae Threatened
Astragalus pycnostachyus var. lanosissimus Milk-vetch, Ventura Marsh Flowering Plants U.S.A. (CA) Fabaceae Endangered
Astragalus robbinsii var. jesupi Milk-vetch, Jesup's Flowering Plants U.S.A. (NH, VT) Fabaceae Endangered
Astragalus tener var. titi Milk-vetch, coastal dunes Flowering Plants U.S.A. (CA) Fabaceae Endangered
Astragalus tricarinatus Milk-vetch, triple-ribbed Flowering Plants U.S.A. (CA) Fabaceae Endangered
Astrophytum asterias Cactus, star Flowering Plants U.S.A. (TX), Mexico Cactaceae Endangered
Atriplex coronata var. notatior Crownscale, San Jacinto Valley Flowering Plants U.S.A. (CA) Chenopodiaceae Endangered
Auerodendron pauciflorum No common name Flowering Plants U.S.A. (PR) Rhamnaceae Endangered
Ayenia limitaris Ayenia, Texas Flowering Plants U.S.A. (TX), Mexico Sterculiaceae Endangered
Baccharis vanessae Baccharis, Encinitas Flowering Plants U.S.A. (CA) Asteraceae Threatened
Banara vanderbiltii Palo de ramon Flowering Plants U.S.A. (PR) Flacourtiaceae Endangered
Baptisia arachnifera Rattleweed, hairy Flowering Plants U.S.A. (GA) Fabaceae Endangered
Berberis nevinii Barberry, Nevin's Flowering Plants U.S.A. (CA) Berberidaceae Endangered
Berberis pinnata ssp. insularis Barberry, island Flowering Plants U.S.A. (CA) Berberidaceae Endangered
Betula uber Birch, Virginia round-leaf Flowering Plants U.S.A. (VA) Betulaceae Threatened
Bidens micrantha ssp. kalealaha Ko`oko`olau Flowering Plants U.S.A. (HI) Asteraceae Endangered
Bidens wiebkei Ko`oko`olau Flowering Plants U.S.A. (HI) Asteraceae Endangered
Blennosperma bakeri Sunshine, Sonoma Flowering Plants U.S.A. (CA) Asteraceae Endangered
Boltonia decurrens Aster, decurrent false Flowering Plants U.S.A. (IL, MO) Asteraceae Threatened
Bonamia grandiflora Bonamia, Florida Flowering Plants U.S.A. (FL) Convolvulaceae Threatened
Bonamia menziesii No common name Flowering Plants U.S.A. (HI) Convolvulaceae Endangered
Brighamia insignis Olulu Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Brighamia rockii Pua `ala Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Brodiaea filifolia Brodiaea, thread-leaved Flowering Plants U.S.A. (CA) Liliaceae Threatened
Brodiaea pallida Brodiaea, Chinese Camp Flowering Plants U.S.A. (CA) Liliaceae Threatened
Buxus vahlii Boxwood, Vahl's Flowering Plants U.S.A. (PR, VI) Buxaceae Endangered
Caesalpinia kavaiense Uhiuhi Flowering Plants U.S.A. (HI) Fabaceae Endangered
Callicarpa ampla Capa rosa Flowering Plants U.S.A. (PR) Verbenaceae Endangered
Callirhoe scabriuscula Poppy-mallow, Texas Flowering Plants U.S.A. (TX) Malvaceae Endangered
Calochortus tiburonensis Mariposa lily, Tiburon Flowering Plants U.S.A. (CA) Liliaceae Threatened
Calyptranthes thomasiana No common name Flowering Plants U.S.A. (PR, VI) British VI Myrtaceae Endangered
Calyptridium pulchellum Pussypaws, Mariposa Flowering Plants U.S.A. (CA) Portulacaceae Threatened
Calyptronoma rivalis Manaca, palma de Flowering Plants U.S.A. (PR) Arecaceae Threatened
Calystegia stebbinsii Morning-glory, Stebbins' Flowering Plants U.S.A. (CA) Convolvulaceae Endangered
Camissonia benitensis Evening-primrose, San Benito Flowering Plants U.S.A. (CA) Onagraceae Threatened
Campanula robinsiae Bellflower, Brooksville Flowering Plants U.S.A. (FL) Campanulaceae Endangered
Canavalia molokaiensis `Awikiwiki Flowering Plants U.S.A. (HI) Fabaceae Endangered
Cardamine micranthera Bittercress, small-anthered Flowering Plants U.S.A. (NC, VA) Brassicaceae Endangered
Carex albida Sedge, white Flowering Plants U.S.A. (CA) Cyperaceae Endangered
Carex lutea Sedge, golden Flowering Plants U.S.A. (NC) Cyperaceae Endangered
Carex specuicola Sedge, Navajo Flowering Plants U.S.A. (AZ, UT) Cyperaceae Threatened
Castilleja affinis ssp. neglecta Paintbrush, Tiburon Flowering Plants U.S.A. (CA) Scrophulariaceae Endangered
Castilleja campestris ssp. succulenta Owl's-clover, fleshy Flowering Plants U.S.A. (CA) Scrophulariaceae Threatened
Castilleja cinerea Paintbrush, ash-grey Flowering Plants U.S.A. (CA) Scrophulariaceae Threatened
Castilleja grisea Indian paintbrush, San Clemente Island Flowering Plants U.S.A. (CA) Scrophulariaceae Endangered
Castilleja levisecta Paintbrush, golden Flowering Plants U.S.A. (OR, WA), Canada (B.C.) Scrophulariaceae Threatened
Castilleja mollis Paintbrush, soft-leaved Flowering Plants U.S.A. (CA) Scrophulariaceae Endangered
Catesbaea melanocarpa No common name Flowering Plants U.S.A. (PR, VI), Antigua, Barbuda, Guadalupe Rubiaceae Endangered
Caulanthus californicus Jewelflower, California Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Ceanothus ferrisae Ceanothus, coyote Flowering Plants U.S.A. (CA) Rhamnaceae Endangered
Ceanothus ophiochilus Ceanothus, Vail Lake Flowering Plants U.S.A. (CA) Rhamnaceae Threatened
Ceanothus roderickii Ceanothus, Pine Hill Flowering Plants U.S.A. (CA) Rhamnaceae Endangered
Cenchrus agrimonioides Kamanomano Flowering Plants U.S.A. (HI) Poaceae Endangered
Centaurium namophilum Centaury, spring-loving Flowering Plants U.S.A. (CA, NV) Gentianaceae Threatened
Centaurium sebaeoides Awiwi Flowering Plants U.S.A. (HI) Gentianaceae Endangered
Cercocarpus traskiae Mountain-mahogany, Catalina Island Flowering Plants U.S.A. (CA) Rosaceae Endangered
Cereus eriophorus var. fragrans Prickly-apple, fragrant Flowering Plants U.S.A. (FL) Cactaceae Endangered
Chamaecrista glandulosa var. mirabilis No common name Flowering Plants U.S.A. (PR) Fabaceae Endangered
Chamaesyce celastroides var. kaenana `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Chamaesyce deltoidea ssp. deltoidea Spurge, deltoid Flowering Plants U.S.A. (FL) Euphorbiaceae Endangered
Chamaesyce deppeana `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Chamaesyce garberi Spurge, Garber's Flowering Plants U.S.A. (FL) Euphorbiaceae Threatened
Chamaesyce halemanui No common name Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Chamaesyce herbstii `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Chamaesyce hooveri Spurge, Hoover's Flowering Plants U.S.A. (CA) Euphorbiaceae Threatened
Chamaesyce kuwaleana `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Chamaesyce rockii `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Chamaesyce skottsbergii var. kalaeloana `Akoko, Ewa Plains Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Chionanthus pygmaeus Fringe-tree, pygmy Flowering Plants U.S.A. (FL) Oleaceae Endangered
Chlorogalum purpureum Amole, purple Flowering Plants U.S.A. (CA) Liliaceae Threatened
Chorizanthe howellii Spineflower, Howell's Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Chorizanthe orcuttiana Spineflower, Orcutt's Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Chorizanthe pungens var. hartwegiana Spineflower, Ben Lomond Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Chorizanthe pungens var. pungens Spineflower, Monterey Flowering Plants U.S.A. (CA) Polygonaceae Threatened
Chorizanthe robusta (incl. vars. robusta and hartwegii) Spineflower, Robust (incl. Scotts Valley) Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Chorizanthe valida Spineflower, Sonoma Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Chrysopsis floridana Aster, Florida golden Flowering Plants U.S.A. (FL) Asteraceae Endangered
Cirsium fontinale var. fontinale Thistle, fountain Flowering Plants U.S.A. (CA) Asteraceae Endangered
Cirsium fontinale var. obispoense Thistle, Chorro Creek bog Flowering Plants U.S.A. (CA) Asteraceae Endangered
Cirsium hydrophilum var. hydrophilum Thistle, Suisun Flowering Plants U.S.A. (CA) Asteraceae Endangered
Cirsium loncholepis Thistle, La Graciosa Flowering Plants U.S.A. (CA) Asteraceae Endangered
Cirsium pitcheri Thistle, Pitcher's Flowering Plants U.S.A. (IL, IN, MI, WI), Canada (Ont.) Asteraceae Threatened
Cirsium vinaceum Thistle, Sacramento Mountains Flowering Plants U.S.A. (NM) Asteraceae Threatened
Cladonia perforata Cladonia, Florida perforate Lichens U.S.A. (FL) Cladoniaceae Endangered
Clarkia franciscana Clarkia, Presidio Flowering Plants U.S.A. (CA) Onagraceae Endangered
Clarkia imbricata Clarkia, Vine Hill Flowering Plants U.S.A. (CA) Onagraceae Endangered
Clarkia speciosa ssp. immaculata Clarkia, Pismo Flowering Plants U.S.A. (CA) Onagraceae Endangered
Clarkia springvillensis Clarkia, Springville Flowering Plants U.S.A. (CA) Onagraceae Threatened
Clematis morefieldii Leather flower, Morefield's Flowering Plants U.S.A. (AL) Ranunculaceae Endangered
Clematis socialis Leather flower, Alabama Flowering Plants U.S.A. (AL) Ranunculaceae Endangered
Clermontia drepanomorpha `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Clermontia lindseyana `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Clermontia oblongifolia ssp. brevipes `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Clermontia oblongifolia ssp. mauiensis `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Clermontia peleana `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Clermontia pyrularia `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Clermontia samuelii `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Clitoria fragrans Pigeon wings Flowering Plants U.S.A. (FL) Fabaceae Threatened
Colubrina oppositifolia Kauila Flowering Plants U.S.A. (HI) Rhamnaceae Endangered
Conradina brevifolia Rosemary, short-leaved Flowering Plants U.S.A. (FL) Lamiaceae Endangered
Conradina etonia Rosemary, Etonia Flowering Plants U.S.A. (FL) Lamiaceae Endangered
Conradina glabra Rosemary, Apalachicola Flowering Plants U.S.A. (FL) Lamiaceae Endangered
Conradina verticillata Rosemary, Cumberland Flowering Plants U.S.A. (KY, TN) Lamiaceae Threatened
Cordia bellonis No common name Flowering Plants U.S.A. (PR) Boraginaceae Endangered
Cordylanthus maritimus ssp. maritimus Bird's-beak, salt marsh Flowering Plants U.S.A. (CA), Mexico (Baja California) Scrophulariaceae Endangered
Cordylanthus mollis ssp. mollis Bird's-beak, soft Flowering Plants U.S.A. (CA) Scrophulariaceae Endangered
Cordylanthus palmatus Bird's beak, palmate-bracted Flowering Plants U.S.A. (CA) Scrophulariaceae Endangered
Cordylanthus tenuis ssp. capillaris Bird's-beak, Pennell's Flowering Plants U.S.A. (CA) Scrophulariaceae Endangered
Cornutia obovata Palo de nigua Flowering Plants U.S.A. (PR) Verbenaceae Endangered
Coryphantha minima Cactus, Nellie cory Flowering Plants U.S.A. (TX) Cactaceae Endangered
Coryphantha ramillosa Cory cactus, bunched Flowering Plants U.S.A. (TX), Mexico (Coahuila) Cactaceae Threatened
Coryphantha robbinsorum Cactus, Cochise pincushion Flowering Plants U.S.A. (AZ), Mexico (Sonora) Cactaceae Threatened
Coryphantha scheeri var. robustispina Cactus, Pima pineapple Flowering Plants U.S.A. (AZ), Mexico (Sonora) Cactaceae Endangered
Coryphantha sneedii var. leei Cactus, Lee pincushion Flowering Plants U.S.A. (NM) Cactaceae Threatened
Coryphantha sneedii var. sneedii Cactus, Sneed pincushion Flowering Plants U.S.A. (NM, TX) Cactaceae Endangered
Cranichis ricartii No common name Flowering Plants U.S.A. (PR) Orchidaceae Endangered
Crescentia portoricensis Higuero de sierra Flowering Plants U.S.A. (PR) Bignoniaceae Endangered
Crotalaria avonensis Harebells, Avon Park Flowering Plants U.S.A. (FL) Fabaceae Endangered
Cryptantha crassipes Cat's-eye, Terlingua Creek Flowering Plants U.S.A. (TX) Boraginaceae Endangered
Ctenitis squamigera Pauoa Ferns and Allies U.S.A. (HI) Aspleniaceae Endangered
Cucurbita okeechobeensis ssp. okeechobeensis Gourd, Okeechobee Flowering Plants U.S.A. (FL) Cucurbitaceae Endangered
Cupressus abramsiana Cypress, Santa Cruz Conifers and Cycads U.S.A. (CA) Cupressaceae Endangered
Cupressus goveniana ssp. goveniana Cypress, Gowen Conifers and Cycads U.S.A. (CA) Cupressaceae Threatened
Cyanea (=Rollandia) crispa No common name Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea acuminata Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea asarifolia Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea copelandii ssp. copelandii Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea copelandii ssp. haleakalaensis Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea dunbarii Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea glabra Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea grimesiana ssp. grimesiana Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea grimesiana ssp. obatae Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea hamatiflora ssp. carlsonii Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea hamatiflora ssp. hamatiflora Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea humboldtiana Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea koolauensis Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea lobata Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea longiflora Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea macrostegia ssp. gibsonii Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea mannii Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea mceldowneyi Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea pinnatifida Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea platyphylla Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea procera Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea recta Haha Flowering Plants U.S.A. (HI) Campanulaceae Threatened
Cyanea remyi Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea shipmanii Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea st.-johnii Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea stictophylla Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea superba Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea truncata Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyanea undulata Haha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Cyathea dryopteroides Fern, Elfin tree Ferns and Allies U.S.A. (PR) Cyatheaceae Endangered
Cycladenia jonesii (=humilis) Cycladenia, Jones Flowering Plants U.S.A. (AZ, UT) Apocynaceae Threatened
Cyperus trachysanthos Pu`uka`a Flowering Plants U.S.A. (HI) Cyperaceae Endangered
Cyrtandra crenata Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Cyrtandra cyaneoides Mapele Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Cyrtandra dentata Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Cyrtandra giffardii Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Cyrtandra limahuliensis Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Threatened
Cyrtandra munroi Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Cyrtandra polyantha Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Cyrtandra subumbellata Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Cyrtandra tintinnabula Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Cyrtandra viridiflora Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae Endangered
Dalea foliosa Prairie-clover, leafy Flowering Plants U.S.A. (AL, IL, TN) Fabaceae Endangered
Daphnopsis hellerana No common name Flowering Plants U.S.A. (PR) Thymelaeaceae Endangered
Deeringothamnus pulchellus Pawpaw, beautiful Flowering Plants U.S.A. (FL) Annonaceae Endangered
Deeringothamnus rugelii Pawpaw, Rugel's Flowering Plants U.S.A. (FL) Annonaceae Endangered
Deinandra (=Hemizonia) conjugens Tarplant, Otay Flowering Plants U.S.A. (CA), Mexico Asteraceae Threatened
Deinandra increscens ssp. villosa Tarplant, Gaviota Flowering Plants U.S.A. (CA) Asteraceae Endangered
Delissea rhytidosperma No common name Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Delissea rivularis Oha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Delissea subcordata Oha Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Delissea undulata No common name Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Delphinium bakeri Larkspur, Baker's Flowering Plants U.S.A. (CA) Ranunculaceae Endangered
Delphinium luteum Larkspur, yellow Flowering Plants U.S.A. (CA) Ranunculaceae Endangered
Delphinium variegatum ssp. kinkiense Larkspur, San Clemente Island Flowering Plants U.S.A. (CA) Ranunculaceae Endangered
Dicerandra christmanii Mint, Garrett's Flowering Plants U.S.A. (FL) Lamiaceae Endangered
Dicerandra cornutissima Mint, longspurred Flowering Plants U.S.A. (FL) Lamiaceae Endangered
Dicerandra frutescens Mint, scrub Flowering Plants U.S.A. (FL) Lamiaceae Endangered
Dicerandra immaculata Mint, Lakela's Flowering Plants U.S.A. (FL) Lamiaceae Endangered
Diellia erecta Diellia, asplenium-leaved Ferns and Allies U.S.A. (HI) Aspleniaceae Endangered
Diellia falcata No common name Ferns and Allies U.S.A. (HI) Aspleniaceae Endangered
Diellia pallida No common name Ferns and Allies U.S.A. (HI) Aspleniaceae Endangered
Diellia unisora No common name Ferns and Allies U.S.A. (HI) Aspleniaceae Endangered
Diplazium molokaiense No common name Ferns and Allies U.S.A. (HI) Aspleniaceae Endangered
Dodecahema leptoceras Spineflower, slender-horned Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Dubautia herbstobatae Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae Endangered
Dubautia latifolia Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae Endangered
Dubautia pauciflorula Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae Endangered
Dubautia plantaginea ssp. humilis Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae Endangered
Dudleya abramsii ssp. parva Dudleya, Conejo Flowering Plants U.S.A. (CA) Crassulaceae Threatened
Dudleya cymosa ssp. marcescens Dudleya, marcescent Flowering Plants U.S.A. (CA) Crassulaceae Threatened
Dudleya cymosa ssp. ovatifolia Dudleyea, Santa Monica Mountains Flowering Plants U.S.A. (CA) Crassulaceae Threatened
Dudleya nesiotica Dudleya, Santa Cruz Island Flowering Plants U.S.A. (CA) Crassulaceae Threatened
Dudleya setchellii Dudleya, Santa Clara Valley Flowering Plants U.S.A. (CA) Crassulaceae Endangered
Dudleya stolonifera Liveforever, Laguna Beach Flowering Plants U.S.A. (CA) Crassulaceae Threatened
Dudleya traskiae Liveforever, Santa Barbara Island Flowering Plants U.S.A. (CA) Crassulaceae Endangered
Dudleya verityi Dudleya, Verity's Flowering Plants U.S.A. (CA) Crassulaceae Threatened
Echinacea laevigata Coneflower, smooth Flowering Plants U.S.A. (GA, MD, NC, PA, SC, VA) Asteraceae Endangered
Echinacea tennesseensis Coneflower, Tennessee purple Flowering Plants U.S.A. (TN) Asteraceae Endangered
Echinocactus horizonthalonius var. nicholii Cactus, Nichol's Turk's head Flowering Plants U.S.A. (AZ) Cactaceae Endangered
Echinocereus chisoensis var. chisoensis Cactus, Chisos Mountain hedgehog Flowering Plants U.S.A. (TX) Cactaceae Threatened
Echinocereus fendleri var. kuenzleri Cactus, Kuenzler hedgehog Flowering Plants U.S.A. (NM) Cactaceae Endangered
Echinocereus reichenbachii var. albertii Cactus, black lace Flowering Plants U.S.A. (TX) Cactaceae Endangered
Echinocereus triglochidiatus var. arizonicus Cactus, Arizona hedgehog Flowering Plants U.S.A. (AZ) Cactaceae Endangered
Echinocereus viridiflorus var. davisii Pitaya, Davis' green Flowering Plants U.S.A. (TX) Cactaceae Endangered
Echinomastus mariposensis Cactus, Lloyd's Mariposa Flowering Plants U.S.A. (TX), Mexico (Coahuila) Cactaceae Threatened
Elaphoglossum serpens No common name Ferns and Allies U.S.A. (PR) Lomariopsidaceae Endangered
Enceliopsis nudicaulis var. corrugata Sunray, Ash Meadows Flowering Plants U.S.A. (NV) Asteraceae Threatened
Eragrostis fosbergii Love grass, Fosberg's Flowering Plants U.S.A. (HI) Poaceae Endangered
Eremalche kernensis Mallow, Kern Flowering Plants U.S.A. (CA) Malvaceae Endangered
Eriastrum densifolium ssp. sanctorum Woolly-star, Santa Ana River Flowering Plants U.S.A. (CA) Polemoniaceae Endangered
Erigeron decumbens var. decumbens Daisy, Willamette Flowering Plants U.S.A. (OR) Asteraceae Endangered
Erigeron maguirei Daisy, Maguire Flowering Plants U.S.A. (UT) Asteraceae Threatened
Erigeron parishii Daisy, Parish's Flowering Plants U.S.A. (CA) Asteraceae Threatened
Erigeron rhizomatus Fleabane, Zuni Flowering Plants U.S.A. (NM) Asteraceae Threatened
Eriodictyon altissimum Mountain balm, Indian Knob Flowering Plants U.S.A. (CA) Hydrophyllaceae Endangered
Eriodictyon capitatum Yerba santa, Lompoc Flowering Plants U.S.A. (CA) Hydrophyllaceae Endangered
Eriogonum apricum (incl. var. prostratum) Buckwheat, Ione (incl. Irish Hill) Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Eriogonum gypsophilum Wild-buckwheat, gypsum Flowering Plants U.S.A. (NM) Polygonaceae Threatened
Eriogonum kennedyi var. austromontanum Wild-buckwheat, southern mountain Flowering Plants U.S.A. (CA) Polygonaceae Threatened
Eriogonum longifolium var. gnaphalifolium Buckwheat, scrub Flowering Plants U.S.A. (FL) Polygonaceae Threatened
Eriogonum ovalifolium var. vineum Buckwheat, cushenbury Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Eriogonum ovalifolium var. williamsiae Buckwheat, steamboat Flowering Plants U.S.A. (NV) Polygonaceae Endangered
Eriogonum pelinophilum Wild-buckwheat, clay-loving Flowering Plants U.S.A. (CO) Polygonaceae Endangered
Eriophyllum latilobum Sunflower, San Mateo woolly Flowering Plants U.S.A. (CA) Asteraceae Endangered
Eryngium aristulatum var. parishii Button-celery, San Diego Flowering Plants U.S.A. (CA) Apiaceae Endangered
Eryngium constancei Thistle, Loch Lomond coyote Flowering Plants U.S.A. (CA) Apiaceae Endangered
Eryngium cuneifolium Snakeroot Flowering Plants U.S.A. (FL) Apiaceae Endangered
Erysimum capitatum var. angustatum Wallflower, Contra Costa Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Erysimum menziesii Wallflower, Menzies' Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Erysimum teretifolium Wallflower, Ben Lomond Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Erythronium propullans Lily, Minnesota dwarf trout Flowering Plants U.S.A. (MN) Liliaceae Endangered
Eugenia haematocarpa Uvillo Flowering Plants U.S.A. (PR) Myrtaceae Endangered
Eugenia koolauensis Nioi Flowering Plants U.S.A. (HI) Myrtaceae Endangered
Eugenia woodburyana No common name Flowering Plants U.S.A. (PR) Myrtaceae Endangered
Euphorbia haeleeleana `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Euphorbia telephioides Spurge, telephus Flowering Plants U.S.A. (FL) Euphorbiaceae Threatened
Eutrema penlandii Mustard, Penland alpine fen Flowering Plants U.S.A. (CO) Brassicaceae Threatened
Exocarpos luteolus Heau Flowering Plants U.S.A. (HI) Santalaceae Endangered
Fitzroya cupressoides Larch, Chilean false Conifers and Cycads Chile, Argentina Cupressaceae Threatened
Flueggea neowawraea Mehamehame Flowering Plants U.S.A. (HI) Euphorbiaceae Endangered
Frankenia johnstonii Frankenia, Johnston's Flowering Plants U.S.A. (TX), Mexico (Nuevo Leon) Frankeniaceae Endangered
Fremontodendron californicum ssp. decumbens Flannelbush, Pine Hill Flowering Plants U.S.A. (CA) Sterculiaceae Endangered
Fremontodendron mexicanum Flannelbush, Mexican Flowering Plants U.S.A. (CA), Mexico Sterculiaceae Endangered
Fritillaria gentneri Fritillary, Gentner's Flowering Plants U.S.A. (OR) Liliaceae Endangered
Gahnia lanaiensis No common name Flowering Plants U.S.A. (HI) Cyperaceae Endangered
Galactia smallii Milkpea, Small's Flowering Plants U.S.A. (FL) Fabaceae Endangered
Galium buxifolium Bedstraw, island Flowering Plants U.S.A. (CA) Rubiaceae Endangered
Galium californicum ssp. sierrae Bedstraw, El Dorado Flowering Plants U.S.A. (CA) Rubiaceae Endangered
Gardenia brighamii Gardenia (=Na`u), Hawaiian Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Gardenia mannii Nanu Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Gaura neomexicana var. coloradensis Butterfly plant, Colorado Flowering Plants U.S.A. (CO, NE, WY) Onagraceae Threatened
Geocarpon minimum No common name Flowering Plants U.S.A. (AR, LA, MO) Caryophyllaceae Threatened
Geranium arboreum Geranium, Hawaiian red-flowered Flowering Plants U.S.A. (HI) Geraniaceae Endangered
Geranium multiflorum Nohoanu Flowering Plants U.S.A. (HI) Geraniaceae Endangered
Gesneria pauciflora No common name Flowering Plants U.S.A. (PR) Gesneriaceae Threatened
Geum radiatum Avens, spreading Flowering Plants U.S.A. (NC, TN) Rosaceae Endangered
Gilia tenuiflora ssp. arenaria Gilia, Monterey Flowering Plants U.S.A. (CA) Polemoniaceae Endangered
Gilia tenuiflora ssp. hoffmannii Gilia, Hoffmann's slender-flowered Flowering Plants U.S.A. (CA) Polemoniaceae Endangered
Goetzea elegans Goetzea, beautiful Flowering Plants U.S.A. (PR) Solanaceae Endangered
Gouania hillebrandii No common name Flowering Plants U.S.A. (HI) Rhamnaceae Endangered
Gouania meyenii No common name Flowering Plants U.S.A. (HI) Rhamnaceae Endangered
Gouania vitifolia No common name Flowering Plants U.S.A. (HI) Rhamnaceae Endangered
Grindelia fraxino-pratensis Gumplant, Ash Meadows Flowering Plants U.S.A. (CA, NV) Asteraceae Threatened
Gymnoderma lineare Lichen, rock gnome Lichens U.S.A. (NC,TN) Cladoniaceae Endangered
Hackelia venusta Stickseed, showy Flowering Plants U.S.A. (WA) Boraginaceae Endangered
Halophila johnsonii Seagrass, Johnson's Flowering Plants U.S.A. (FL) Hydrocharitaceae Threatened
Haplostachys haplostachya Honohono Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Harperocallis flava Beauty, Harper's Flowering Plants U.S.A. (FL) Liliaceae Endangered
Harrisia portoricensis Chumbo, Higo Flowering Plants U.S.A. (PR) Cactaceae Threatened
Hedeoma todsenii Pennyroyal, Todsen's Flowering Plants U.S.A. (NM) Lamiaceae Endangered
Hedyotis cookiana Awiwi Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Hedyotis coriacea Kio`ele Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Hedyotis degeneri No common name Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Hedyotis mannii Pilo Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Hedyotis parvula No common name Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Hedyotis purpurea var. montana Bluet, Roan Mountain Flowering Plants U.S.A. (NC, TN) Rubiaceae Endangered
Hedyotis schlechtendahliana var. remyi Kopa Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Hedyotis st.-johnii Hedyotis, Na Pali beach Flowering Plants U.S.A. (HI) Rubiaceae Endangered
Helenium virginicum Sneezeweed, Virginia Flowering Plants U.S.A. (MO, VA) Asteraceae Threatened
Helianthemum greenei Rush-rose, island Flowering Plants U.S.A. (CA) Cistaceae Threatened
Helianthus paradoxus Sunflower, Pecos (=puzzle, =paradox) Flowering Plants U.S.A. (NM, TX) Asteraceae Threatened
Helianthus schweinitzii Sunflower, Schweinitz's Flowering Plants U.S.A. (NC, SC) Asteraceae Endangered
Helonias bullata Pink, swamp Flowering Plants U.S.A. (DE, GA, MD, NC, NJ, NY, SC, VA) Liliaceae Threatened
Hesperolinon congestum Dwarf-flax, Marin Flowering Plants U.S.A. (CA) Linaceae Threatened
Hesperomannia arborescens No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Hesperomannia arbuscula No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Hesperomannia lydgatei No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Hexastylis naniflora Heartleaf, dwarf-flowered Flowering Plants U.S.A. (NC, SC) Aristolochiaceae Threatened
Hibiscadelphus distans Kauai hau kuahiwi Flowering Plants U.S.A. (HI) Malvaceae Endangered
Hibiscadelphus giffardianus Hau kuahiwi Flowering Plants U.S.A. (HI) Malvaceae Endangered
Hibiscadelphus hualalaiensis Hau kuahiwi Flowering Plants U.S.A. (HI) Malvaceae Endangered
Hibiscadelphus woodii Hau kuahiwi Flowering Plants U.S.A. (HI) Malvaceae Endangered
Hibiscus arnottianus ssp. immaculatus Koki`o ke`oke`o Flowering Plants U.S.A. (HI) Malvaceae Endangered
Hibiscus brackenridgei Ma`o hau hele, (=native yellow hibiscus) Flowering Plants U.S.A. (HI) Malvaceae Endangered
Hibiscus clayi Hibiscus, Clay's Flowering Plants U.S.A. (HI) Malvaceae Endangered
Hibiscus waimeae ssp. hannerae Koki`o ke`oke`o Flowering Plants U.S.A. (HI) Malvaceae Endangered
Hoffmannseggia tenella Rush-pea, slender Flowering Plants U.S.A. (TX) Fabaceae Endangered
Holocarpha macradenia Tarplant, Santa Cruz Flowering Plants U.S.A. (CA) Asteraceae Threatened
Howellia aquatilis Howellia, water Flowering Plants U.S.A. (CA, ID, MT, OR, WA) Campanulaceae Threatened
Hudsonia montana Heather, mountain golden Flowering Plants U.S.A. (NC) Cistaceae Threatened
Huperzia mannii Wawae`iole Ferns and Allies U.S.A. (HI) Lycopodiaceae Endangered
Hymenoxys herbacea Daisy, lakeside Flowering Plants U.S.A. (IL, MI, OH), Canada (Ont.) Asteraceae Threatened
Hymenoxys texana Dawn-flower, Texas prairie Flowering Plants U.S.A. (TX) Asteraceae Endangered
Hypericum cumulicola Hypericum, highlands scrub Flowering Plants U.S.A. (FL) Hypericaceae Endangered
Ilex cookii Holly, Cook's Flowering Plants U.S.A. (PR) Aquifoliaceae Endangered
Ilex sintenisii No common name Flowering Plants U.S.A. (PR) Aquifoliaceae Endangered
Iliamna corei Mallow, Peter's Mountain Flowering Plants U.S.A. (VA) Malvaceae Endangered
Ipomopsis sancti-spiritus Ipomopsis, Holy Ghost Flowering Plants U.S.A. (NM) Polemoniaceae Endangered
Iris lacustris Iris, dwarf lake Flowering Plants U.S.A. (MI, WI), Canada (Ont.) Iridaceae Threatened
Ischaemum byrone Ischaemum, Hilo Flowering Plants U.S.A. (HI) Poaceae Endangered
Isodendrion hosakae Aupaka Flowering Plants U.S.A. (HI) Violaceae Endangered
Isodendrion laurifolium Aupaka Flowering Plants U.S.A. (HI) Violaceae Endangered
Isodendrion longifolium Aupaka Flowering Plants U.S.A. (HI) Violaceae Threatened
Isodendrion pyrifolium Kula wahine noho Flowering Plants U.S.A. (HI) Violaceae Endangered
Isoetes louisianensis Quillwort, Louisiana Ferns and Allies U.S.A. (LA, MS) Isoetaceae Endangered
Isoetes melanospora Quillwort, black spored Ferns and Allies U.S.A. (GA, SC) Isoetaceae Endangered
Isoetes tegetiformans Quillwort, mat-forming Ferns and Allies U.S.A. (GA) Isoetaceae Endangered
Isotria medeoloides Pogonia, small whorled Flowering Plants U.S.A. (CT, DC, DE, GA, IL, MA, MD, ME, MI, MO, NC, NH, NJ, NY, PA, RI, SC, TN, VA, VT,WV), Canada (Ont.) Orchidaceae Threatened
Ivesia kingii var. eremica Ivesia, Ash Meadows Flowering Plants U.S.A. (NV) Rosaceae Threatened
Jacquemontia reclinata Jacquemontia, beach Flowering Plants U.S.A. (FL) Convolvulaceae Endangered
Jatropha costaricensis Jatropha, Costa Rican Flowering Plants Costa Rica Euphorbiaceae Endangered
Juglans jamaicensis Walnut (=Nogal), West Indian Flowering Plants U.S.A. (PR), Cuba, Hispaniola Juglandaceae Endangered
Justicia cooleyi Water-willow, Cooley's Flowering Plants U.S.A. (FL) Acanthaceae Endangered
Kanaloa kahoolawensis Kohe malama malama o kanaloa Flowering Plants U.S.A. (HI) Fabaceae Endangered
Kokia cookei Koki`o, Cooke's Flowering Plants U.S.A. (HI) Malvaceae Endangered
Kokia drynarioides Koki`o Flowering Plants U.S.A. (HI) Malvaceae Endangered
Kokia kauaiensis Koki`o Flowering Plants U.S.A. (HI) Malvaceae Endangered
Labordia cyrtandrae Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae Endangered
Labordia lydgatei Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae Endangered
Labordia tinifolia var. lanaiensis Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae Endangered
Labordia tinifolia var. wahiawaensis Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae Endangered
Labordia triflora Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae Endangered
Lasthenia burkei Goldfields, Burke's Flowering Plants U.S.A. (CA) Asteraceae Endangered
Lasthenia conjugens Goldfields, Contra Costa Flowering Plants U.S.A. (CA) Asteraceae Endangered
Layia carnosa Layia, beach Flowering Plants U.S.A. (CA) Asteraceae Endangered
Lepanthes eltoroensis No common name Flowering Plants U.S.A. (PR) Orchidaceae Endangered
Lepidium arbuscula `Anaunau Flowering Plants U.S.A. (HI) Brassicaceae Endangered
Lepidium barnebyanum Ridge-cress, Barneby Flowering Plants U.S.A. (UT) Brassicaceae Endangered
Leptocereus grantianus No common name Flowering Plants U.S.A. (PR) Cactaceae Endangered
Lespedeza leptostachya Bush-clover, prairie Flowering Plants U.S.A. (IA, IL, MN, WI) Fabaceae Threatened
Lesquerella congesta Bladderpod, Dudley Bluffs Flowering Plants U.S.A. (CO) Brassicaceae Threatened
Lesquerella filiformis Bladderpod, Missouri Flowering Plants U.S.A. (AR, MO) Brassicaceae Threatened
Lesquerella kingii ssp. bernardina Bladderpod, San Bernardino Mountains Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Lesquerella lyrata Bladderpod, lyrate Flowering Plants U.S.A. (AL) Brassicaceae Threatened
Lesquerella pallida Bladderpod, white Flowering Plants U.S.A. (TX) Brassicaceae Endangered
Lesquerella perforata Bladderpod, Spring Creek Flowering Plants U.S.A. (TN) Brassicaceae Endangered
Lesquerella thamnophila Bladderpod, Zapata Flowering Plants U.S.A. (TX) Brassicaceae Endangered
Lesquerella tumulosa Bladderpod, kodachrome Flowering Plants U.S.A. (UT) Brassicaceae Endangered
Lessingia germanorum (=L.g. var. germanorum) Lessingia, San Francisco Flowering Plants U.S.A. (CA) Asteraceae Endangered
Liatris helleri Blazingstar, Heller's Flowering Plants U.S.A. (NC) Asteraceae Threatened
Liatris ohlingerae Blazingstar, scrub Flowering Plants U.S.A. (FL) Asteraceae Endangered
Lilaeopsis schaffneriana var. recurva Water-umbel, Huachuca Flowering Plants U.S.A. (AZ), Mexico Apiaceae Endangered
Lilium occidentale Lily, Western Flowering Plants U.S.A. (OR, CA) Liliaceae Endangered
Lilium pardalinum ssp. pitkinense Lily, Pitkin Marsh Flowering Plants U.S.A. (CA) Liliaceae Endangered
Limnanthes floccosa ssp. californica Meadowfoam, Butte County Flowering Plants U.S.A. (CA) Limnanthaceae Endangered
Limnanthes floccosa ssp. grandiflora Meadowfoam, large-flowered woolly Flowering Plants U.S.A. (OR) Limnanthaceae Endangered
Limnanthes vinculans Meadowfoam, Sebastopol Flowering Plants U.S.A. (CA) Limnanthaceae Endangered
Lindera melissifolia Pondberry Flowering Plants U.S.A. (AL, AR, FL, GA, LA, MO, MS, NC, SC) Lauraceae Endangered
Lipochaeta fauriei Nehe Flowering Plants U.S.A. (HI) Asteraceae Endangered
Lipochaeta kamolensis Nehe Flowering Plants U.S.A. (HI) Asteraceae Endangered
Lipochaeta lobata var. leptophylla Nehe Flowering Plants U.S.A. (HI) Asteraceae Endangered
Lipochaeta micrantha Nehe Flowering Plants U.S.A. (HI) Asteraceae Endangered
Lipochaeta tenuifolia Nehe Flowering Plants U.S.A. (HI) Asteraceae Endangered
Lipochaeta venosa No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Lipochaeta waimeaensis Nehe Flowering Plants U.S.A. (HI) Asteraceae Endangered
Lithophragma maximum Woodland-star, San Clemente Island Flowering Plants U.S.A. (CA) Saxifragaceae Endangered
Lobelia gaudichaudii ssp. koolauensis No common name Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Lobelia monostachya No common name Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Lobelia niihauensis No common name Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Lobelia oahuensis No common name Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Lomatium bradshawii Desert-parsley, Bradshaw's Flowering Plants U.S.A. (OR,WA) Apiaceae Endangered
Lomatium cookii Lomatium, Cook's Flowering Plants U.S.A. (OR) Apiaceae Endangered
Lotus dendroideus ssp. traskiae Broom, San Clemente Island Flowering Plants U.S.A. (CA) Fabaceae Endangered
Lupinus aridorum Lupine, scrub Flowering Plants U.S.A. (FL) Fabaceae Endangered
Lupinus nipomensis Lupine, Nipomo Mesa Flowering Plants U.S.A. (CA) Fabaceae Endangered
Lupinus sulphureus (=oreganus) ssp. kincaidii (=var. kincaidii) Lupine, Kincaid's Flowering Plants U.S.A. (OR, WA) Fabaceae Threatened
Lupinus tidestromii Lupine, clover Flowering Plants U.S.A. (CA) Fabaceae Endangered
Lycopodium (=Phlegmariurus) nutans Wawae`iole Ferns and Allies U.S.A. (HI) Lycopodiaceae Endangered
Lyonia truncata var. proctorii No common name Flowering Plants U.S.A. (PR) Ericaceae Endangered
Lysimachia asperulaefolia Loosestrife, rough-leaved Flowering Plants U.S.A. (NC, SC) Primulaceae Endangered
Lysimachia filifolia No common name Flowering Plants U.S.A. (HI) Primulaceae Endangered
Lysimachia lydgatei No common name Flowering Plants U.S.A. (HI) Primulaceae Endangered
Lysimachia maxima No common name Flowering Plants U.S.A. (HI) Primulaceae Endangered
Macbridea alba Birds-in-a-nest, white Flowering Plants U.S.A. (FL) Lamiaceae Threatened
Malacothamnus clementinus Bush-mallow, San Clemente Island Flowering Plants U.S.A. (CA) Malvaceae Endangered
Malacothamnus fasciculatus var. nesioticus Bush-mallow, Santa Cruz Island Flowering Plants U.S.A. (CA) Malvaceae Endangered
Malacothrix indecora Malacothrix, Santa Cruz Island Flowering Plants U.S.A. (CA) Asteraceae Endangered
Malacothrix squalida Malacothrix, island Flowering Plants U.S.A. (CA) Asteraceae Endangered
Manihot walkerae Manioc, Walker's Flowering Plants U.S.A. (TX), Mexico Euphorbiaceae Endangered
Mariscus fauriei No common name Flowering Plants U.S.A. (HI) Cyperaceae Endangered
Mariscus pennatiformis No common name Flowering Plants U.S.A. (HI) Cyperaceae Endangered
Marshallia mohrii Button, Mohr's Barbara Flowering Plants U.S.A. (AL, GA) Asteraceae Threatened
Marsilea villosa Ihi`ihi Ferns and Allies U.S.A. (HI) Marsileaceae Endangered
Melicope adscendens Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope balloui Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope haupuensis Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope knudsenii Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope lydgatei Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope mucronulata Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope munroi Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope ovalis Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope pallida Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope quadrangularis Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope reflexa Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope saint-johnii Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Melicope zahlbruckneri Alani Flowering Plants U.S.A. (HI) Rutaceae Endangered
Mentzelia leucophylla Blazingstar, Ash Meadows Flowering Plants U.S.A. (NV) Loasaceae Threatened
Mimulus glabratus var. michiganensis Monkey-flower, Michigan Flowering Plants U.S.A. (MI) Scrophulariaceae Endangered
Mirabilis macfarlanei Four-o'clock, MacFarlane's Flowering Plants U.S.A. (ID, OR) Nyctaginaceae Threatened
Mitracarpus maxwelliae No common name Flowering Plants U.S.A. (PR) Rubiaceae Endangered
Mitracarpus polycladus No common name Flowering Plants U.S.A. (PR), Saba Rubiaceae Endangered
Monardella linoides ssp. viminea Monardella, willowy Flowering Plants U.S.A. (CA), Mexico Lamiaceae Endangered
Monolopia (=Lembertia) congdonii Wooly-threads, San Joaquin Flowering Plants U.S.A. (CA) Asteraceae Endangered
Munroidendron racemosum No common name Flowering Plants U.S.A. (HI) Araliaceae Endangered
Myrcia paganii No common name Flowering Plants U.S.A. (PR) Myrtaceae Endangered
Myrsine juddii Kolea Flowering Plants U.S.A. (HI) Myrsinaceae Endangered
Myrsine linearifolia Kolea Flowering Plants U.S.A. (HI) Myrsinaceae Threatened
Navarretia fossalis Navarretia, spreading Flowering Plants U.S.A. (CA), Mexico (Baja California) Polemoniaceae Threatened
Navarretia leucocephala ssp. pauciflora (=N. pauciflora) Navarretia, few-flowered Flowering Plants U.S.A. (CA) Polemoniaceae Endangered
Navarretia leucocephala ssp. plieantha Navarretia, many-flowered Flowering Plants U.S.A. (CA) Polemoniaceae Endangered
Neostapfia colusana Grass, Colusa Flowering Plants U.S.A. (CA) Poaceae Threatened
Neraudia angulata No common name Flowering Plants U.S.A. (HI) Urticaceae Endangered
Neraudia ovata No common name Flowering Plants U.S.A. (HI) Urticaceae Endangered
Neraudia sericea No common name Flowering Plants U.S.A. (HI) Urticaceae Endangered
Nesogenes rotensis No common name Flowering Plants U.S.A. (MP) Verbenaceae Endangered
Nitrophila mohavensis Niterwort, Amargosa Flowering Plants U.S.A. (CA, NV) Chenopodiaceae Endangered
Nolina brittoniana Beargrass, Britton's Flowering Plants U.S.A. (FL) Agavaceae Endangered
Nothocestrum breviflorum `Aiea Flowering Plants U.S.A. (HI) Solanaceae Endangered
Nothocestrum peltatum `Aiea Flowering Plants U.S.A. (HI) Solanaceae Endangered
Nototrichium humile Kulu`i Flowering Plants U.S.A. (HI) Amaranthaceae Endangered
Ochrosia kilaueaensis Holei Flowering Plants U.S.A. (HI) Apocynaceae Endangered
Oenothera avita ssp. eurekensis Evening-primrose, Eureka Valley Flowering Plants U.S.A. (CA) Onagraceae Endangered
Oenothera deltoides ssp. howellii Evening-primrose, Antioch Dunes Flowering Plants U.S.A. (CA) Onagraceae Endangered
Opuntia treleasei Cactus, Bakersfield Flowering Plants U.S.A. (CA) Cactaceae Endangered
Orcuttia californica Orcutt grass, California Flowering Plants U.S.A. (CA) Poaceae Endangered
Orcuttia inaequalis Orcutt grass, San Joaquin Flowering Plants U.S.A. (CA) Poaceae Threatened
Orcuttia pilosa Orcutt grass, hairy Flowering Plants U.S.A. (CA) Poaceae Endangered
Orcuttia tenuis Orcutt grass, slender Flowering Plants U.S.A. (CA) Poaceae Threatened
Orcuttia viscida Orcutt grass, Sacramento Flowering Plants U.S.A. (CA) Poaceae Endangered
Osmoxylon mariannense No common name Flowering Plants U.S.A. (MP) Araliaceae Endangered
Ottoschulzia rhodoxylon Palo de rosa Flowering Plants U.S.A. (PR), Dominican Republic Icacinaceae Endangered
Oxypolis canbyi Dropwort, Canby's Flowering Plants U.S.A. (DE, GA, MD, NC, SC) Apiaceae Endangered
Oxytheca parishii var. goodmaniana Oxytheca, cushenbury Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Oxytropis campestris var. chartacea Locoweed, Fassett's Flowering Plants U.S.A. (WI) Fabaceae Threatened
Panicum fauriei var. carteri Panicgrass, Carter's Flowering Plants U.S.A. (HI) Poaceae Endangered
Panicum niihauense Lau `ehu Flowering Plants U.S.A. (HI) Poaceae Endangered
Paronychia chartacea Whitlow-wort, papery Flowering Plants U.S.A. (FL) Caryophyllaceae Threatened
Parvisedum leiocarpum Stonecrop, Lake County Flowering Plants U.S.A. (CA) Crassulaceae Endangered
Pedicularis furbishiae Lousewort, Furbish Flowering Plants U.S.A. (ME), Canada (N.B.) Scrophulariaceae Endangered
Pediocactus (=Echinocactus,=Utahia) sileri Cactus, Siler pincushion Flowering Plants U.S.A. (AZ, UT) Cactaceae Threatened
Pediocactus bradyi Cactus, Brady pincushion Flowering Plants U.S.A. (AZ) Cactaceae Endangered
Pediocactus despainii Cactus, San Rafael Flowering Plants U.S.A. (UT) Cactaceae Endangered
Pediocactus knowltonii Cactus, Knowlton Flowering Plants U.S.A. (CO, NM) Cactaceae Endangered
Pediocactus peeblesianus peeblesianus Cactus, Peebles Navajo Flowering Plants U.S.A. (AZ) Cactaceae Endangered
Pediocactus winkleri Cactus, Winkler Flowering Plants U.S.A. (UT) Cactaceae Threatened
Penstemon haydenii Penstemon, blowout Flowering Plants Nebraska and Wyoming Scrophulariaceae Endangered
Penstemon penlandii Beardtongue, Penland Flowering Plants U.S.A. (CO) Scrophulariaceae Endangered
Pentachaeta bellidiflora Pentachaeta, white-rayed Flowering Plants U.S.A. (CA) Asteraceae Endangered
Pentachaeta lyonii Pentachaeta, Lyon's Flowering Plants U.S.A. (CA) Asteraceae Endangered
Peperomia wheeleri Peperomia, Wheeler's Flowering Plants U.S.A. (PR) Piperaceae Endangered
Peucedanum sandwicense Makou Flowering Plants U.S.A. (HI) Apiaceae Threatened
Phacelia argillacea Phacelia, clay Flowering Plants U.S.A. (UT) Hydrophyllaceae Endangered
Phacelia formosula Phacelia, North Park Flowering Plants U.S.A. (CO) Hydrophyllaceae Endangered
Phacelia insularis ssp. insularis Phacelia, island Flowering Plants U.S.A. (CA) Hydrophyllaceae Endangered
Phlox hirsuta Phlox, Yreka Flowering Plants U.S.A. (CA) Polemoniaceae Endangered
Phlox nivalis ssp. texensis Phlox, Texas trailing Flowering Plants U.S.A. (TX) Polemoniaceae Endangered
Phyllostegia glabra var. lanaiensis No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia hirsuta No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia kaalaensis No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia knudsenii No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia mannii No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia mollis No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia parviflora No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia racemosa Kiponapona Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia velutina No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia waimeae No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia warshaueri No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Phyllostegia wawrana No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Physaria obcordata Twinpod, Dudley Bluffs Flowering Plants U.S.A. (CO) Brassicaceae Threatened
Pilosocereus robinii Cactus, Key tree Flowering Plants U.S.A. (FL), Cuba Cactaceae Endangered
Pinguicula ionantha Butterwort, Godfrey's Flowering Plants U.S.A. (FL) Lentibulariaceae Threatened
Piperia yadonii Piperia, Yadon's Flowering Plants U.S.A. (CA) Orchidaceae Endangered
Pityopsis ruthii Aster, Ruth's golden Flowering Plants U.S.A. (TN) Asteraceae Endangered
Plagiobothrys hirtus Popcornflower, rough Flowering Plants U.S.A. (OR) Boraginaceae Endangered
Plagiobothrys strictus Allocarya, Calistoga Flowering Plants U.S.A. (CA) Boraginaceae Endangered
Plantago hawaiensis Kuahiwi laukahi Flowering Plants U.S.A. (HI) Plantaginaceae Endangered
Plantago princeps Kuahiwi laukahi Flowering Plants U.S.A. (HI) Plantaginaceae Endangered
plantago princeps var. anomala Ale Flowering Plants Plantaginacea Endangered
plantago princeps var. longibracteata Ale Flowering Plants Plantaginaceae Endangered
Platanthera holochila No common name Flowering Plants U.S.A. (HI) Orchidaceae Endangered
Platanthera leucophaea Orchid, eastern prairie fringed Flowering Plants U.S.A. (AR, IA, IL, IN, ME, MI, MO, NE, NJ, NY, OH, OK, PA, VA, WI), Canada (Ont., N.B.) Orchidaceae Threatened
Platanthera praeclara Orchid, western prairie fringed Flowering Plants U.S.A. (IA, KS, MN, MO, ND, NE, OK, SD), Canada (Man.) Orchidaceae Threatened
Pleodendron macranthum Chupacallos Flowering Plants U.S.A. (PR) Canellaceae Endangered
Pleomele hawaiiensis Hala pepe Flowering Plants U.S.A. (HI) Liliaceae Endangered
Poa atropurpurea Bluegrass, San Bernardino Flowering Plants U.S.A. (CA) Poaceae Endangered
Poa mannii Bluegrass, Mann's Flowering Plants U.S.A. (HI) Poaceae Endangered
Poa napensis Bluegrass, Napa Flowering Plants U.S.A. (CA) Poaceae Endangered
Poa sandvicensis Bluegrass, Hawaiian Flowering Plants U.S.A. (HI) Poaceae Endangered
Poa siphonoglossa No common name Flowering Plants U.S.A. (HI) Poaceae Endangered
Pogogyne abramsii Mesa-mint, San Diego Flowering Plants U.S.A. (CA) Lamiaceae Endangered
Pogogyne nudiuscula Mesa-mint, Otay Flowering Plants U.S.A. (CA), Mexico (Baja California) Lamiaceae Endangered
Polygala lewtonii Polygala, Lewton's Flowering Plants U.S.A. (FL) Polygalaceae Endangered
Polygala smallii Polygala, tiny Flowering Plants U.S.A. (FL) Polygalaceae Endangered
Polygonella basiramia Wireweed Flowering Plants U.S.A. (FL) Polygonaceae Endangered
Polygonella myriophylla Sandlace Flowering Plants U.S.A. (FL) Polygonaceae Endangered
Polygonum hickmanii Polygonum, Scotts Valley Flowering Plants U.S.A. (CA) Polygonaceae Endangered
Polystichum aleuticum Fern, Aleutian shield Ferns and Allies U.S.A. (AK) Dryopteridaceae Endangered
Polystichum calderonense No common name Ferns and Allies U.S.A. (PR) Dryopteridaceae Endangered
Portulaca sclerocarpa Po`e Flowering Plants U.S.A. (HI) Portulacaceae Endangered
Potamogeton clystocarpus Pondweed, Little Aguja (=Creek) Flowering Plants U.S.A. (TX) Potamogetonaceae Endangered
Potentilla hickmanii Potentilla, Hickman's Flowering Plants U.S.A. (CA) Rosaceae Endangered
Primula maguirei Primrose, Maguire Flowering Plants U.S.A. (UT) Primulaceae Threatened
Pritchardia affinis Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae Endangered
Pritchardia aylmer-robinsonii Wahane Flowering Plants U.S.A. (HI) Arecaceae Endangered
Pritchardia kaalae Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae Endangered
Pritchardia munroi Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae Endangered
Pritchardia napaliensis Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae Endangered
Pritchardia remota Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae Endangered
Pritchardia schattaueri Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae Endangered
Pritchardia viscosa Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae Endangered
Prunus geniculata Plum, scrub Flowering Plants U.S.A. (FL) Rosaceae Endangered
Pseudobahia bahiifolia Sunburst, Hartweg's golden Flowering Plants U.S.A. (CA) Asteraceae Endangered
Pseudobahia peirsonii Sunburst, San Joaquin adobe Flowering Plants U.S.A. (CA) Asteraceae Threatened
Pteralyxia kauaiensis Kaulu Flowering Plants U.S.A. (HI) Apocynaceae Endangered
Pteris lidgatei No common name Ferns and Allies U.S.A. (HI) Adiantaceae Endangered
Ptilimnium nodosum Harperella Flowering Plants U.S.A. (AL, AR, GA, MD, NC, SC, WV) Apiaceae Endangered
Purshia (=Cowania) subintegra Cliff-rose, Arizona Flowering Plants U.S.A. (AZ) Rosaceae Endangered
Quercus hinckleyi Oak, Hinckley Flowering Plants U.S.A. (TX) Fagaceae Threatened
Ranunculus aestivalis (=acriformis) Buttercup, autumn Flowering Plants U.S.A. (UT) Ranunculaceae Endangered
Remya kauaiensis No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Remya mauiensis Remya, Maui Flowering Plants U.S.A. (HI) Asteraceae Endangered
Remya montgomeryi No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Rhododendron chapmanii Rhododendron, Chapman Flowering Plants U.S.A. (FL) Ericaceae Endangered
Rhus michauxii Sumac, Michaux's Flowering Plants U.S.A. (GA, NC, SC, VA) Anacardiaceae Endangered
Rhynchospora knieskernii Beaked-rush, Knieskern's Flowering Plants U.S.A. (DE, NJ) Cyperaceae Threatened
Ribes echinellum Gooseberry, Miccosukee Flowering Plants U.S.A. (FL, SC) Saxifragaceae Threatened
Rorippa gambellii Watercress, Gambel's Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Sagittaria fasciculata Arrowhead, bunched Flowering Plants U.S.A. (NC, SC) Alismataceae Endangered
Sagittaria secundifolia Water-plantain, Kral's Flowering Plants U.S.A. (AL, GA) Alismataceae Threatened
Sanicula mariversa No common name Flowering Plants U.S.A. (HI) Apiaceae Endangered
Sanicula purpurea No common name Flowering Plants U.S.A. (HI) Apiaceae Endangered
Santalum freycinetianum var. lanaiense Sandalwood, Lanai (=`iliahi) Flowering Plants U.S.A. (HI) Santalaceae Endangered
Sarracenia oreophila Pitcher-plant, green Flowering Plants U.S.A. (AL, GA, NC, TN) Sarraceniaceae Endangered
Sarracenia rubra alabamensis Pitcher-plant, Alabama canebrake Flowering Plants U.S.A. (AL) Sarraceniaceae Endangered
Sarracenia rubra ssp. jonesii Pitcher-plant, mountain sweet Flowering Plants U.S.A. (NC, SC) Sarraceniaceae Endangered
Scaevola coriacea Naupaka, dwarf Flowering Plants U.S.A. (HI) Goodeniaceae Endangered
Schiedea adamantis Schiedea, Diamond Head Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea apokremnos Ma`oli`oli Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea haleakalensis No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea helleri No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea hookeri No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea kaalae No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea kauaiensis No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea kealiae Ma`oli`oli Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea lydgatei No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea membranacea No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea nuttallii No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea sarmentosa No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea spergulina var. leiopoda No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea spergulina var. spergulina No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Threatened
Schiedea stellarioides Laulihilihi Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schiedea verticillata No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Schoenocrambe argillacea Reed-mustard, clay Flowering Plants U.S.A. (UT) Brassicaceae Threatened
Schoenocrambe barnebyi Reed-mustard, Barneby Flowering Plants U.S.A. (UT) Brassicaceae Endangered
Schoenocrambe suffrutescens Reed-mustard, shrubby Flowering Plants U.S.A. (UT) Brassicaceae Endangered
Schoepfia arenaria No common name Flowering Plants U.S.A. (PR) Olacaceae Threatened
Schwalbea americana Chaffseed, American Flowering Plants U.S.A. (AL, CT, DE, FL, GA, LA, MA, MD, MI, MS, NC, NJ, NY, SC, TN, VA) Scrophulariaceae Endangered
Scirpus ancistrochaetus Bulrush, Northeastern Flowering Plants U.S.A. (MA, MD, NH, NY, PA, VA, VT, WV) Cyperaceae Endangered
Sclerocactus glaucus Cactus, Uinta Basin hookless Flowering Plants U.S.A. (CO, UT) Cactaceae Threatened
Sclerocactus mesae-verdae Cactus, Mesa Verde Flowering Plants U.S.A. (CO, NM) Cactaceae Threatened
Sclerocactus wrightiae Cactus, Wright fishhook Flowering Plants U.S.A. (UT) Cactaceae Endangered
Scutellaria floridana Skullcap, Florida Flowering Plants U.S.A. (FL) Lamiaceae Threatened
Scutellaria montana Skullcap, large-flowered Flowering Plants U.S.A. (GA, TN) Lamiaceae Threatened
Sedum integrifolium ssp. leedyi Roseroot, Leedy's Flowering Plants U.S.A. (MN, NY) Crassulaceae Threatened
Senecio franciscanus Groundsel, San Francisco Peaks Flowering Plants U.S.A. (AZ) Asteraceae Threatened
Senecio layneae Butterweed, Layne's Flowering Plants U.S.A. (CA) Asteraceae Threatened
Serianthes nelsonii Iagu, Hayun (=(Guam), Tronkon guafi (Rota)) Flowering Plants Western Pacific Ocean-U.S.A. (GU, MP-Rota) Fabaceae Endangered
Sesbania tomentosa Ohai Flowering Plants U.S.A. (HI) Fabaceae Endangered
Sibara filifolia Rockcress, Santa Cruz Island Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Sicyos alba `Anunu Flowering Plants U.S.A. (HI) Cucurbitaceae Endangered
Sidalcea keckii Checker-mallow, Keck's Flowering Plants U.S.A. (CA) Malvaceae Endangered
Sidalcea nelsoniana Checker-mallow, Nelson's Flowering Plants U.S.A. (OR, WA) Malvaceae Threatened
Sidalcea oregana ssp. valida Checker-mallow, Kenwood Marsh Flowering Plants U.S.A. (CA) Malvaceae Endangered
Sidalcea oregana var. calva Checkermallow, Wenatchee Mountains Flowering Plants U.S.A. (WA) Malvaceae Endangered
Sidalcea pedata Checker-mallow, pedate Flowering Plants U.S.A. (CA) Malvaceae Endangered
Silene alexandri No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Silene hawaiiensis No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Threatened
Silene lanceolata No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Silene perlmanii No common name Flowering Plants U.S.A. (HI) Caryophyllaceae Endangered
Silene polypetala Campion, fringed Flowering Plants U.S.A. (FL, GA) Caryophyllaceae Endangered
Silene spaldingii Catchfly, Spalding's Flowering Plants U.S.A. (ID, MT, OR, WA) Caryophyllaceae Threatened
Sisyrinchium dichotomum Irisette, white Flowering Plants U.S.A. (NC) Iridaceae Endangered
Solanum drymophilum Erubia Flowering Plants U.S.A. (PR) Solanaceae Endangered
Solanum incompletum Popolo ku mai Flowering Plants U.S.A. (HI) Solanaceae Endangered
Solanum sandwicense `Aiakeakua, popolo Flowering Plants U.S.A. (HI) Solanaceae Endangered
Solidago albopilosa Goldenrod, white-haired Flowering Plants U.S.A. (KY) Asteraceae Threatened
Solidago houghtonii Goldenrod, Houghton's Flowering Plants U.S.A. (MI), Canada (Ont.) Asteraceae Threatened
Solidago shortii Goldenrod, Short's Flowering Plants U.S.A. (KY) Asteraceae Endangered
Solidago spithamaea Goldenrod, Blue Ridge Flowering Plants U.S.A. (NC, TN) Asteraceae Threatened
Spermolepis hawaiiensis No common name Flowering Plants U.S.A. (HI) Apiaceae Endangered
Spigelia gentianoides Pinkroot, gentian Flowering Plants U.S.A. (AL, FL) Loganiaceae Endangered
Spiraea virginiana Spiraea, Virginia Flowering Plants U.S.A. (GA, KY, NC, OH, PA, TN, VA, WV) Rosaceae Threatened
Spiranthes delitescens Ladies'-tresses, Canelo Hills Flowering Plants U.S.A. (AZ) Orchidaceae Endangered
Spiranthes diluvialis Ladies'-tresses, Ute Flowering Plants U.S.A. (CO, ID, MT, NE, NV, UT, WA, WY) Orchidaceae Threatened
Spiranthes parksii Ladies'-tresses, Navasota Flowering Plants U.S.A. (TX) Orchidaceae Endangered
Stahlia monosperma Cobana negra Flowering Plants U.S.A. (PR), Dominican Republic Fabaceae Threatened
Stenogyne angustifolia var. angustifolia No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Stenogyne bifida No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Stenogyne campanulata No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Stenogyne kanehoana No common name Flowering Plants U.S.A. (HI) Lamiaceae Endangered
Stephanomeria malheurensis Wire-lettuce, Malheur Flowering Plants U.S.A. (OR) Asteraceae Endangered
Streptanthus albidus ssp. albidus Jewelflower, Metcalf Canyon Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Streptanthus niger Jewelflower, Tiburon Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Styrax portoricensis Palo de jazmin Flowering Plants U.S.A. (PR) Styracaceae Endangered
Styrax texanus Snowbells, Texas Flowering Plants U.S.A. (TX) Styracaceae Endangered
Suaeda californica Seablite, California Flowering Plants U.S.A. (CA) Chenopodiaceae Endangered
Swallenia alexandrae Grass, Eureka Dune Flowering Plants U.S.A. (CA) Poaceae Endangered
Taraxacum californicum Taraxacum, California Flowering Plants U.S.A. (CA) Asteraceae Endangered
Tectaria estremerana No common name Ferns and Allies U.S.A. (PR) Dryopteridaceae Endangered
Ternstroemia luquillensis Palo colorado Flowering Plants U.S.A. (PR) Theaceae Endangered
Ternstroemia subsessilis No common name Flowering Plants U.S.A. (PR) Theaceae Endangered
Tetramolopium arenarium No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Tetramolopium capillare Pamakani Flowering Plants U.S.A. (HI) Asteraceae Endangered
Tetramolopium filiforme No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Tetramolopium lepidotum ssp. lepidotum No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Tetramolopium remyi No common name Flowering Plants U.S.A. (HI) Asteraceae Endangered
Tetramolopium rockii No common name Flowering Plants U.S.A. (HI) Asteraceae Threatened
Tetraplasandra gymnocarpa `Ohe`ohe Flowering Plants U.S.A. (HI) Araliaceae Endangered
Thalictrum cooleyi Meadowrue, Cooley's Flowering Plants U.S.A. (FL, NC) Ranunculaceae Endangered
Thelypodium howellii spectabilis Thelypody, Howell's spectacular Flowering Plants U.S.A. (OR) Brassicaceae Threatened
Thelypodium stenopetalum Mustard, slender-petaled Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Thelypteris inabonensis No common name Ferns and Allies U.S.A. (PR) Thelypteridaceae Endangered
Thelypteris pilosa var. alabamensis Fern, Alabama streak-sorus Ferns and Allies U.S.A. (AL) Thelypteridaceae Threatened
Thelypteris verecunda No common name Ferns and Allies U.S.A. (PR) Thelypteridaceae Endangered
Thelypteris yaucoensis No common name Ferns and Allies U.S.A. (PR) Thelypteridaceae Endangered
Thlaspi californicum Penny-cress, Kneeland Prairie Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Thymophylla tephroleuca Dogweed, ashy Flowering Plants U.S.A. (TX) Asteraceae Endangered
Thysanocarpus conchuliferus Fringepod, Santa Cruz Island Flowering Plants U.S.A. (CA) Brassicaceae Endangered
Torreya taxifolia Torreya, Florida Conifers and Cycads U.S.A. (FL, GA) Taxaceae Endangered
Townsendia aprica Townsendia, Last Chance Flowering Plants U.S.A. (UT) Asteraceae Threatened
Trematolobelia singularis No common name Flowering Plants U.S.A. (HI) Campanulaceae Endangered
Trichilia triacantha Bariaco Flowering Plants U.S.A. (PR) Meliaceae Endangered
Trichostema austromontanum ssp. compactum Bluecurls, Hidden Lake Flowering Plants U.S.A. (CA) Lamiaceae Threatened
Trifolium amoenum Clover, showy Indian Flowering Plants U.S.A. (CA) Fabaceae Endangered
Trifolium stoloniferum Clover, running buffalo Flowering Plants U.S.A. (AR, IL, IN, KS, KY, MO, OH, WV) Fabaceae Endangered
Trifolium trichocalyx Clover, Monterey Flowering Plants U.S.A. (CA) Fabaceae Endangered
Trillium persistens Trillium, persistent Flowering Plants U.S.A. (GA, SC) Liliaceae Endangered
Trillium reliquum Trillium, relict Flowering Plants U.S.A. (AL, GA, SC) Liliaceae Endangered
Tuctoria greenei Tuctoria, Greene's Flowering Plants U.S.A. (CA Poaceae Endangered
Tuctoria mucronata Grass, Solano Flowering Plants U.S.A. (CA) Poaceae Endangered
Urera kaalae Opuhe Flowering Plants U.S.A. (HI) Urticaceae Endangered
Verbena californica Vervain, Red Hills Flowering Plants U.S.A. (CA) Verbenaceae Threatened
Verbesina dissita Crownbeard, big-leaved Flowering Plants U.S.A. (CA), Mexico. Asteraceae Threatened
Vernonia proctorii No common name Flowering Plants U.S.A. (PR) Asteraceae Endangered
Vicia menziesii Vetch, Hawaiian Flowering Plants U.S.A. (HI) Fabaceae Endangered
Vigna o-wahuensis No common name Flowering Plants U.S.A. (HI) Fabaceae Endangered
Viola chamissoniana ssp. chamissoniana Pamakani Flowering Plants U.S.A. (HI) Violaceae Endangered
Viola helenae No common name Flowering Plants U.S.A. (HI) Violaceae Endangered
Viola kauaiensis var. wahiawaensis Nani wai`ale`ale Flowering Plants U.S.A. (HI) Violaceae Endangered
Viola lanaiensis No common name Flowering Plants U.S.A. (HI) Violaceae Endangered
Viola oahuensis No common name Flowering Plants U.S.A. (HI) Violaceae Endangered
Warea amplexifolia Warea, wide-leaf Flowering Plants U.S.A. (FL) Brassicaceae Endangered
Warea carteri Mustard, Carter's Flowering Plants U.S.A. (FL) Brassicaceae Endangered
Wilkesia hobdyi Iliau, dwarf Flowering Plants U.S.A. (HI) Asteraceae Endangered
Xylosma crenatum No common name Flowering Plants U.S.A. (HI) Flacourtiaceae Endangered
Xyris tennesseensis Grass, Tennessee yellow-eyed Flowering Plants U.S.A. (AL, GA, TN) Xyridaceae Endangered
Yermo xanthocephalus Yellowhead, desert Flowering Plants U.S.A. (WY) Asteraceae Threatened
Zanthoxylum dipetalum var. tomentosum A`e Flowering Plants U.S.A. (HI) Rutaceae Endangered
Zanthoxylum hawaiiense A`e Flowering Plants U.S.A. (HI) Rutaceae Endangered
Zanthoxylum thomasianum Prickly-ash, St. Thomas Flowering Plants U.S.A. (PR, VI) Rutaceae Endangered
Zizania texana Wild-rice, Texas Flowering Plants U.S.A. (TX) Poaceae Endangered
Ziziphus celata Ziziphus, Florida Flowering Plants U.S.A. (FL) Rhamnaceae Endangered