Species Reports
Environmental Conservation Online System

Listed plants

  • Group Type: Plants
  • Listing Status: Endangered,Threatened,Emergency Listing (Threatened),Emergency Listing (Endangered),Experimental Population (Essential),Experimental Population (Non-Essential),Similarity of Appearance (Endangered),Similarity of Appearance (Threatened)
819 records returned
Scientific Name Inverted Common Name Species Group Historic Range Family Listing Status Critical Habitat Special Rules
Abies guatemalensis Fir, Guatemalan (=pinabete) Conifers and Cycads Mexico, Guatemala, Honduras, El Salvador Pinaceae T N/A N/A
Abronia macrocarpa Sand-verbena, large-fruited Flowering Plants U.S.A. (TX) Nyctaginaceae E N/A N/A
Abutilon eremitopetalum No common name Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Abutilon menziesii Ko`oloa`ula Flowering Plants U.S.A. (HI) Malvaceae E N/A N/A
Abutilon sandwicense No common name Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Acaena exigua Liliwai Flowering Plants U.S.A. (HI) Rosaceae E 17.96(a) N/A
Acanthomintha ilicifolia Thornmint, San Diego Flowering Plants U.S.A. (CA), Mexico Lamiaceae T 17.96(a) N/A
Acanthomintha obovata ssp. duttonii Thornmint, San Mateo Flowering Plants U.S.A. (CA) Lamiaceae E N/A N/A
Achyranthes mutica No common name Flowering Plants U.S.A. (HI) Amaranthaceae E 17.96(a) N/A
Achyranthes splendens var. rotundata Chaff-flower, round-leaved Flowering Plants U.S.A. (HI) Amaranthaceae E 17.96(a) N/A
Aconitum noveboracense Monkshood, northern wild Flowering Plants U.S.A. (IA, NY, OH, WI) Ranunculaceae T N/A N/A
Adenophorus periens Fern, pendant kihi Ferns and Allies U.S.A. (HI) Grammitidaceae E 17.96(a) N/A
Adiantum vivesii No common name Ferns and Allies U.S.A. (PR) Adiantaceae E N/A N/A
Aeschynomene virginica Joint-vetch, sensitive Flowering Plants U.S.A. (DE, MD, NC, NJ, PA, VA) Fabaceae T N/A N/A
Agalinis acuta Gerardia, sandplain Flowering Plants U.S.A. (CT, MA, MD, NY, RI) Scrophulariaceae E N/A N/A
Alectryon macrococcus Mahoe Flowering Plants U.S.A. (HI) Sapindaceae E 17.96(a) N/A
Allium munzii Onion, Munz's Flowering Plants U.S.A. (CA) Liliaceae E 17.96(a) N/A
Alopecurus aequalis var. sonomensis Alopecurus, Sonoma Flowering Plants U.S.A. (CA) Poaceae E N/A N/A
Alsinidendron lychnoides Kuawawaenohu Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Alsinidendron obovatum No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Alsinidendron trinerve No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Alsinidendron viscosum No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Amaranthus brownii No common name Flowering Plants U.S.A. (HI) Amaranthaceae E 17.96(a) N/A
Amaranthus pumilus Amaranth, seabeach Flowering Plants U.S.A. (DE, MA, MD, NC, NJ, NY, RI, SC, VA) Amaranthaceae T N/A N/A
Ambrosia cheiranthifolia Ambrosia, south Texas Flowering Plants U.S.A. (TX) Asteraceae E N/A N/A
Ambrosia pumila Ambrosia, San Diego Flowering Plants U.S.A. (CA), Mexico Asteraceae E 17.96(a) N/A
Amorpha crenulata Lead-plant, Crenulate Flowering Plants U.S.A. (FL) Fabaceae E N/A N/A
Amphianthus pusillus Amphianthus, little Flowering Plants U.S.A. (AL, GA, SC) Scrophulariaceae T N/A N/A
Amsinckia grandiflora Fiddleneck, large-flowered Flowering Plants U.S.A. (CA) Boraginaceae E 17.96(a) N/A
Amsonia kearneyana Blue-star, Kearney's Flowering Plants U.S.A. (AZ) Apocynaceae E N/A N/A
Apios priceana Potato-bean, Price's Flowering Plants U.S.A. (AL, IL, KY, MS, TN) Fabaceae T N/A N/A
Arabis hoffmannii Rock-cress, Hoffmann's Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Arabis macdonaldiana Rock-cress, McDonald's Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Arabis perstellata Rock-cress, Braun's Flowering Plants U.S.A. (KY,TN) Brassicaceae E 17.96(a) N/A
Arabis serotina rock cress, Shale barren Flowering Plants U.S.A. (VA, WV) Brassicaceae E N/A N/A
Arctomecon humilis Bear-poppy, Dwarf Flowering Plants U.S.A. (UT) Papaveraceae E N/A N/A
Arctostaphylos confertiflora Manzanita, Santa Rosa Island Flowering Plants U.S.A. (CA) Ericaceae E N/A N/A
Arctostaphylos franciscana Manzanita, San Francisco Flowering Plants U.S.A. (CA). Ericaceae E N/A N/A
Arctostaphylos glandulosa ssp. crassifolia Manzanita, Del Mar Flowering Plants U.S.A. (CA), Mexico. Ericaceae E N/A N/A
Arctostaphylos hookeri var. ravenii Manzanita, Presidio Flowering Plants U.S.A. (CA) Ericaceae E N/A N/A
Arctostaphylos morroensis Manzanita, Morro Flowering Plants U.S.A. (CA) Ericaceae T N/A N/A
Arctostaphylos myrtifolia Manzanita, Ione Flowering Plants U.S.A. (CA) Ericaceae T N/A N/A
Arctostaphylos pallida Manzanita, pallid Flowering Plants U.S.A. (CA) Ericaceae T N/A N/A
Arenaria cumberlandensis Sandwort, Cumberland Flowering Plants U.S.A. (KY, TN) Caryophyllaceae E N/A N/A
Arenaria paludicola Sandwort, Marsh Flowering Plants U.S.A. (CA) Caryophyllaceae E N/A N/A
Arenaria ursina Sandwort, Bear Valley Flowering Plants U.S.A. (CA) Caryophyllaceae T 17.96(a) N/A
Argemone pleiacantha ssp. pinnatisecta Poppy, Sacramento prickly Flowering Plants U.S.A. (NM) Papaveraceae E N/A N/A
Argyroxiphium kauense Silversword, Mauna Loa (=Ka'u) Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Argyroxiphium sandwicense ssp. macrocephalum `Ahinahina Flowering Plants U.S.A. (HI) Asteraceae T 17.96(a) N/A
Argyroxiphium sandwicense ssp. sandwicense `Ahinahina Flowering Plants U.S.A. (HI) Asteraceae E N/A N/A
Aristida chaseae No common name Flowering Plants U.S.A. (PR) Poaceae E N/A N/A
Aristida portoricensis Pelos del diablo Flowering Plants U.S.A. (PR) Poaceae E N/A N/A
Asclepias meadii Milkweed, Mead's Flowering Plants U.S.A. (IA, IL, IN, KS, MO, WI) Asclepiadaceae T N/A N/A
Asclepias welshii Milkweed, Welsh's Flowering Plants U.S.A. (AZ, UT) Asclepiadaceae T 17.96(a) N/A
Asimina tetramera Pawpaw, four-petal Flowering Plants U.S.A. (FL) Annonaceae E N/A N/A
Asplenium fragile var. insulare No common name Ferns and Allies U.S.A. (HI) Aspleniaceae E 17.96(a) N/A
Asplenium scolopendrium var. americanum Fern, American hart's-tongue Ferns and Allies U.S.A. (AL, MI, NY, TN), Canada (Ont.) Aspleniaceae T N/A N/A
Astelia waialealae Pa`iniu Flowering Plants U.S.A. (HI) Liliaceae E 17.96(a)
Astragalus albens Milk-vetch, Cushenbury Flowering Plants U.S.A. (CA) Fabaceae E 17.96(a) N/A
Astragalus ampullarioides Milk-vetch, Shivwits Flowering Plants U.S.A. (UT) Fabaceae E 17.96(a) N/A
Astragalus applegatei Milk-vetch, Applegate's Flowering Plants U.S.A. (OR) Fabaceae E N/A N/A
Astragalus bibullatus Ground-plum, Guthrie's (=Pyne's) Flowering Plants U.S.A. (TN) Fabaceae E N/A N/A
Astragalus brauntonii Milk-vetch, Braunton's Flowering Plants U.S.A. (CA) Fabaceae E 17.96(a) N/A
Astragalus clarianus Milk-vetch, Clara Hunt's Flowering Plants U.S.A. (CA) Fabaceae E N/A N/A
Astragalus cremnophylax var. cremnophylax Milk-vetch, Sentry Flowering Plants U.S.A. (AZ) Fabaceae E N/A N/A
Astragalus desereticus Milk-vetch, Deseret Flowering Plants U.S.A. (UT) Fabaceae T N/A N/A
Astragalus holmgreniorum Milk-vetch, Holmgren Flowering Plants U.S.A. (AZ, UT) Fabaceae E 17.96(a) N/A
Astragalus humillimus Milk-vetch, Mancos Flowering Plants U.S.A. (CO, NM) Fabaceae E N/A N/A
Astragalus jaegerianus Milk-vetch, Lane Mountain Flowering Plants U.S.A. (CA) Fabaceae E 17.96(a) N/A
Astragalus lentiginosus var. coachellae Milk-vetch, Coachella Valley Flowering Plants U.S.A. (CA) Fabaceae E 17.96(a) N/A
Astragalus lentiginosus var. piscinensis Milk-vetch, Fish Slough Flowering Plants U.S.A. (CA) Fabaceae T 17.96(a) N/A
Astragalus magdalenae var. peirsonii Milk-vetch, Peirson's Flowering Plants U.S.A. (CA) Fabaceae T 17.96(a) N/A
Astragalus montii Milk-vetch, heliotrope Flowering Plants U.S.A. (UT) Fabaceae T 17.96(a) N/A
Astragalus osterhoutii milkvetch, Osterhout Flowering Plants U.S.A. (CO) Fabaceae E N/A N/A
Astragalus phoenix Milk-vetch, Ash meadows Flowering Plants U.S.A. (NV) Fabaceae T 17.96(a) N/A
Astragalus pycnostachyus var. lanosissimus Milk-vetch, Ventura Marsh Flowering Plants U.S.A. (CA) Fabaceae E 17.96(a) N/A
Astragalus robbinsii var. jesupi Milk-vetch, Jesup's Flowering Plants U.S.A. (NH, VT) Fabaceae E N/A N/A
Astragalus tener var. titi Milk-vetch, coastal dunes Flowering Plants U.S.A. (CA) Fabaceae E N/A N/A
Astragalus tricarinatus Milk-vetch, triple-ribbed Flowering Plants U.S.A. (CA) Fabaceae E N/A N/A
Astrophytum asterias Cactus, star Flowering Plants U.S.A. (TX), Mexico Cactaceae E N/A N/A
Atriplex coronata var. notatior Crownscale, San Jacinto Valley Flowering Plants U.S.A. (CA) Chenopodiaceae E 17.96(a) N/A
Auerodendron pauciflorum No common name Flowering Plants U.S.A. (PR) Rhamnaceae E N/A N/A
Ayenia limitaris Ayenia, Texas Flowering Plants U.S.A. (TX), Mexico Sterculiaceae E N/A N/A
Baccharis vanessae Baccharis, Encinitas Flowering Plants U.S.A. (CA) Asteraceae T N/A N/A
Banara vanderbiltii Palo de ramon Flowering Plants U.S.A. (PR) Flacourtiaceae E N/A N/A
Baptisia arachnifera Rattleweed, hairy Flowering Plants U.S.A. (GA) Fabaceae E N/A N/A
Berberis nevinii Barberry, Nevin's Flowering Plants U.S.A. (CA) Berberidaceae E 17.96(a) N/A
Berberis pinnata ssp. insularis Barberry, island Flowering Plants U.S.A. (CA) Berberidaceae E N/A N/A
Betula uber Birch, Virginia round-leaf Flowering Plants U.S.A. (VA) Betulaceae T N/A N/A
Bidens amplectens Ko`oko`olau Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Bidens micrantha ssp. kalealaha Ko`oko`olau Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Bidens wiebkei Ko`oko`olau Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Blennosperma bakeri Sunshine, Sonoma Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Boltonia decurrens Aster, decurrent false Flowering Plants U.S.A. (IL, MO) Asteraceae T N/A N/A
Bonamia grandiflora Bonamia, Florida Flowering Plants U.S.A. (FL) Convolvulaceae T N/A N/A
Bonamia menziesii No common name Flowering Plants U.S.A. (HI) Convolvulaceae E 17.96(a) N/A
Brighamia insignis Olulu Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Brighamia rockii Pua `ala Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Brodiaea filifolia Brodiaea, thread-leaved Flowering Plants U.S.A. (CA) Liliaceae T 17.96(a) N/A
Brodiaea pallida Brodiaea, Chinese Camp Flowering Plants U.S.A. (CA) Liliaceae T N/A N/A
Buxus vahlii Boxwood, Vahl's Flowering Plants U.S.A. (PR, VI) Buxaceae E N/A N/A
Caesalpinia kavaiense Uhiuhi Flowering Plants U.S.A. (HI) Fabaceae E N/A N/A
Callicarpa ampla Capa rosa Flowering Plants U.S.A. (PR) Verbenaceae E N/A N/A
Callirhoe scabriuscula Poppy-mallow, Texas Flowering Plants U.S.A. (TX) Malvaceae E N/A N/A
Calochortus tiburonensis Mariposa lily, Tiburon Flowering Plants U.S.A. (CA) Liliaceae T N/A N/A
Calyptranthes thomasiana No common name Flowering Plants U.S.A. (PR, VI) British VI Myrtaceae E N/A N/A
Calyptridium pulchellum Pussypaws, Mariposa Flowering Plants U.S.A. (CA) Portulacaceae T N/A N/A
Calyptronoma rivalis Manaca, palma de Flowering Plants U.S.A. (PR) Arecaceae T N/A N/A
Calystegia stebbinsii Morning-glory, Stebbins' Flowering Plants U.S.A. (CA) Convolvulaceae E N/A N/A
Camissonia benitensis Evening-primrose, San Benito Flowering Plants U.S.A. (CA) Onagraceae T N/A N/A
Campanula robinsiae Bellflower, Brooksville Flowering Plants U.S.A. (FL) Campanulaceae E N/A N/A
Canavalia molokaiensis `Awikiwiki Flowering Plants U.S.A. (HI) Fabaceae E 17.96(a) N/A
Canavalia napaliensis `Awikiwiki Flowering Plants U.S.A. (HI) Fabaceae E 17.96(a) N/A
Cardamine micranthera Bittercress, small-anthered Flowering Plants U.S.A. (NC, VA) Brassicaceae E N/A N/A
Carex albida Sedge, white Flowering Plants U.S.A. (CA) Cyperaceae E N/A N/A
Carex lutea Sedge, golden Flowering Plants U.S.A. (NC) Cyperaceae E 17.96(a) N/A
Carex specuicola Sedge, Navajo Flowering Plants U.S.A. (AZ, UT) Cyperaceae T 17.96(a) N/A
Castilleja affinis ssp. neglecta Paintbrush, Tiburon Flowering Plants U.S.A. (CA) Scrophulariaceae E N/A N/A
Castilleja campestris ssp. succulenta Owl's-clover, fleshy Flowering Plants U.S.A. (CA) Scrophulariaceae T 17.96(a) N/A
Castilleja cinerea Paintbrush, ash-grey Flowering Plants U.S.A. (CA) Scrophulariaceae T 17.96(a) N/A
Castilleja grisea Indian paintbrush, San Clemente Island Flowering Plants U.S.A. (CA) Scrophulariaceae E N/A N/A
Castilleja levisecta Paintbrush, golden Flowering Plants U.S.A. (OR, WA), Canada (B.C.) Scrophulariaceae T N/A N/A
Castilleja mollis Paintbrush, soft-leaved Flowering Plants U.S.A. (CA) Scrophulariaceae E N/A N/A
Catesbaea melanocarpa No common name Flowering Plants U.S.A. (PR, VI), Antigua, Barbuda, Guadalupe Rubiaceae E 17.96(a) N/A
Caulanthus californicus Jewelflower, California Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Ceanothus ferrisae Ceanothus, coyote Flowering Plants U.S.A. (CA) Rhamnaceae E N/A N/A
Ceanothus ophiochilus Ceanothus, Vail Lake Flowering Plants U.S.A. (CA) Rhamnaceae T 17.96(a) N/A
Ceanothus roderickii Ceanothus, Pine Hill Flowering Plants U.S.A. (CA) Rhamnaceae E N/A N/A
Cenchrus agrimonioides Kamanomano Flowering Plants U.S.A. (HI) Poaceae E 17.96(a) N/A
Centaurium namophilum Centaury, spring-loving Flowering Plants U.S.A. (CA, NV) Gentianaceae T 17.96(a) N/A
Centaurium sebaeoides Awiwi Flowering Plants U.S.A. (HI) Gentianaceae E 17.96(a) N/A
Cercocarpus traskiae Mountain-mahogany, Catalina Island Flowering Plants U.S.A. (CA) Rosaceae E N/A N/A
Cereus eriophorus var. fragrans Prickly-apple, fragrant Flowering Plants U.S.A. (FL) Cactaceae E N/A N/A
Chamaecrista glandulosa var. mirabilis No common name Flowering Plants U.S.A. (PR) Fabaceae E N/A N/A
Chamaesyce celastroides var. kaenana `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce deltoidea ssp. deltoidea Spurge, deltoid Flowering Plants U.S.A. (FL) Euphorbiaceae E N/A N/A
Chamaesyce deppeana `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce eleanoriae `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce garberi Spurge, Garber's Flowering Plants U.S.A. (FL) Euphorbiaceae T N/A N/A
Chamaesyce halemanui No common name Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce herbstii `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce hooveri Spurge, Hoover's Flowering Plants U.S.A. (CA) Euphorbiaceae T 17.96(a) N/A
Chamaesyce kuwaleana `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce remyi var. kauaiensis `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce remyi var. remyi `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce rockii `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Chamaesyce skottsbergii var. kalaeloana `Akoko, Ewa Plains Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Charpentiera densiflora Papala Flowering Plants U.S.A. (HI) Amaranthaceae E 17.96(a) N/A
Chionanthus pygmaeus Fringe-tree, pygmy Flowering Plants U.S.A. (FL) Oleaceae E N/A N/A
Chlorogalum purpureum Amole, purple Flowering Plants U.S.A. (CA) Liliaceae T 17.96(a) N/A
Chorizanthe howellii Spineflower, Howell's Flowering Plants U.S.A. (CA) Polygonaceae E N/A N/A
Chorizanthe orcuttiana Spineflower, Orcutt's Flowering Plants U.S.A. (CA) Polygonaceae E N/A N/A
Chorizanthe pungens var. hartwegiana Spineflower, Ben Lomond Flowering Plants U.S.A. (CA) Polygonaceae E N/A N/A
Chorizanthe pungens var. pungens Spineflower, Monterey Flowering Plants U.S.A. (CA) Polygonaceae T 17.96(a) N/A
Chorizanthe robusta var. hartwegii spineflower, Scotts Valley Flowering Plants U.S.A. (CA) Polygonaceae E N/A N/A
Chorizanthe robusta var. robusta spineflower, Robust Flowering Plants Polygonaceae E N/A N/A
Chorizanthe valida Spineflower, Sonoma Flowering Plants U.S.A. (CA) Polygonaceae E N/A N/A
Chrysopsis floridana Aster, Florida golden Flowering Plants U.S.A. (FL) Asteraceae E N/A N/A
Cirsium fontinale var. fontinale Thistle, fountain Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Cirsium fontinale var. obispoense Thistle, Chorro Creek bog Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Cirsium hydrophilum var. hydrophilum Thistle, Suisun Flowering Plants U.S.A. (CA) Asteraceae E 17.96(a) N/A
Cirsium loncholepis Thistle, La Graciosa Flowering Plants U.S.A. (CA) Asteraceae E 17.96(a) N/A
Cirsium pitcheri Thistle, Pitcher's Flowering Plants U.S.A. (IL, IN, MI, WI), Canada (Ont.) Asteraceae T N/A N/A
Cirsium vinaceum Thistle, Sacramento Mountains Flowering Plants U.S.A. (NM) Asteraceae T N/A N/A
Cladonia perforata Cladonia, Florida perforate Lichens U.S.A. (FL) Cladoniaceae E N/A N/A
Clarkia franciscana Clarkia, Presidio Flowering Plants U.S.A. (CA) Onagraceae E N/A N/A
Clarkia imbricata Clarkia, Vine Hill Flowering Plants U.S.A. (CA) Onagraceae E N/A N/A
Clarkia speciosa ssp. immaculata Clarkia, Pismo Flowering Plants U.S.A. (CA) Onagraceae E N/A N/A
Clarkia springvillensis Clarkia, Springville Flowering Plants U.S.A. (CA) Onagraceae T N/A N/A
Clematis morefieldii Leather flower, Morefield's Flowering Plants U.S.A. (AL) Ranunculaceae E N/A N/A
Clematis socialis Leather flower, Alabama Flowering Plants U.S.A. (AL) Ranunculaceae E N/A N/A
Clermontia drepanomorpha `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Clermontia lindseyana `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Clermontia oblongifolia ssp. brevipes `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Clermontia oblongifolia ssp. mauiensis `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Clermontia peleana `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Clermontia pyrularia `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Clermontia samuelii `Oha wai Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Clitoria fragrans Pigeon wings Flowering Plants U.S.A. (FL) Fabaceae T N/A N/A
Colubrina oppositifolia Kauila Flowering Plants U.S.A. (HI) Rhamnaceae E 17.96(a) N/A
Conradina brevifolia Rosemary, short-leaved Flowering Plants U.S.A. (FL) Lamiaceae E N/A N/A
Conradina etonia Rosemary, Etonia Flowering Plants U.S.A. (FL) Lamiaceae E N/A N/A
Conradina glabra Rosemary, Apalachicola Flowering Plants U.S.A. (FL) Lamiaceae E N/A N/A
Conradina verticillata Rosemary, Cumberland Flowering Plants U.S.A. (KY, TN) Lamiaceae T N/A N/A
Cordia bellonis No common name Flowering Plants U.S.A. (PR) Boraginaceae E N/A N/A
Cordylanthus maritimus ssp. maritimus Bird's-beak, salt marsh Flowering Plants U.S.A. (CA), Mexico (Baja California) Scrophulariaceae E N/A N/A
Cordylanthus mollis ssp. mollis Bird's-beak, soft Flowering Plants U.S.A. (CA) Scrophulariaceae E 17.96(a) N/A
Cordylanthus palmatus Bird's beak, palmate-bracted Flowering Plants U.S.A. (CA) Scrophulariaceae E N/A N/A
Cordylanthus tenuis ssp. capillaris Bird's-beak, Pennell's Flowering Plants U.S.A. (CA) Scrophulariaceae E N/A N/A
Cornutia obovata Palo de nigua Flowering Plants U.S.A. (PR) Verbenaceae E N/A N/A
Coryphantha minima Cactus, Nellie cory Flowering Plants U.S.A. (TX) Cactaceae E N/A N/A
Coryphantha ramillosa Cory cactus, bunched Flowering Plants U.S.A. (TX), Mexico (Coahuila) Cactaceae T N/A N/A
Coryphantha robbinsorum Cactus, Cochise pincushion Flowering Plants U.S.A. (AZ), Mexico (Sonora) Cactaceae T N/A N/A
Coryphantha scheeri var. robustispina Cactus, Pima pineapple Flowering Plants U.S.A. (AZ), Mexico (Sonora) Cactaceae E N/A N/A
Coryphantha sneedii var. leei Cactus, Lee pincushion Flowering Plants U.S.A. (NM) Cactaceae T N/A N/A
Coryphantha sneedii var. sneedii Cactus, Sneed pincushion Flowering Plants U.S.A. (NM, TX) Cactaceae E N/A N/A
Cranichis ricartii No common name Flowering Plants U.S.A. (PR) Orchidaceae E N/A N/A
Crescentia portoricensis Higuero de sierra Flowering Plants U.S.A. (PR) Bignoniaceae E N/A N/A
Crotalaria avonensis Harebells, Avon Park Flowering Plants U.S.A. (FL) Fabaceae E N/A N/A
Cryptantha crassipes Cat's-eye, Terlingua Creek Flowering Plants U.S.A. (TX) Boraginaceae E N/A N/A
Ctenitis squamigera Pauoa Ferns and Allies U.S.A. (HI) Aspleniaceae E 17.96(a) N/A
Cucurbita okeechobeensis ssp. okeechobeensis Gourd, Okeechobee Flowering Plants U.S.A. (FL) Cucurbitaceae E N/A N/A
Cupressus abramsiana Cypress, Santa Cruz Conifers and Cycads U.S.A. (CA) Cupressaceae E N/A N/A
Cupressus goveniana ssp. goveniana Cypress, Gowen Conifers and Cycads U.S.A. (CA) Cupressaceae T N/A N/A
Cyanea acuminata Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea asarifolia Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea calycina Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea copelandii ssp. copelandii Haha Flowering Plants U.S.A. (HI) Campanulaceae E N/A N/A
Cyanea copelandii ssp. haleakalaensis Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea dolichopoda Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea dunbarii Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea eleeleensis Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea glabra Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea grimesiana ssp. grimesiana Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea grimesiana ssp. obatae Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea hamatiflora ssp. carlsonii Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea hamatiflora ssp. hamatiflora Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea humboldtiana Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea kolekoleensis Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea koolauensis Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea kuhihewa Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea lanceolata Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea lobata Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea longiflora Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea macrostegia ssp. gibsonii Haha Flowering Plants U.S.A. (HI) Campanulaceae E N/A N/A
Cyanea mannii Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea mceldowneyi Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea pinnatifida Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea platyphylla Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea procera Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea purpurellifolia No common name Flowering Plants Campanulaceae E 17.96(a) N/A
Cyanea recta Haha Flowering Plants U.S.A. (HI) Campanulaceae T 17.96(a) N/A
Cyanea remyi Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea (=Rollandia) crispa No common name Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea shipmanii Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea stictophylla Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea st.-johnii Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea superba Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea truncata Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyanea undulata Haha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Cyathea dryopteroides Fern, Elfin tree Ferns and Allies U.S.A. (PR) Cyatheaceae E N/A N/A
Cycladenia humilis var. jonesii Cycladenia, Jones Flowering Plants U.S.A. (AZ, UT) Apocynaceae T N/A N/A
Cyperus trachysanthos Pu`uka`a Flowering Plants U.S.A. (HI) Cyperaceae E 17.96(a) N/A
Cyrtandra crenata Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E N/A N/A
Cyrtandra cyaneoides Mapele Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra dentata Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra giffardii Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra gracilis No common name Flowering Plants Gesneriaceae E 17.96(a) N/A
Cyrtandra kaulantha Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra limahuliensis Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae T 17.96(a) N/A
Cyrtandra munroi Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra oenobarba Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra paliku Haiwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra polyantha Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra sessilis Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra subumbellata Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra tintinnabula Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra viridiflora Ha`iwale Flowering Plants U.S.A. (HI) Gesneriaceae E 17.96(a) N/A
Cyrtandra waiolani No common name Flowering Plants Gesneriaceae E 17.96(a) N/A
Dalea foliosa Prairie-clover, leafy Flowering Plants U.S.A. (AL, IL, TN) Fabaceae E N/A N/A
Daphnopsis hellerana No common name Flowering Plants U.S.A. (PR) Thymelaeaceae E N/A N/A
Deeringothamnus pulchellus Pawpaw, beautiful Flowering Plants U.S.A. (FL) Annonaceae E N/A N/A
Deeringothamnus rugelii Pawpaw, Rugel's Flowering Plants U.S.A. (FL) Annonaceae E N/A N/A
Deinandra (=Hemizonia) conjugens Tarplant, Otay Flowering Plants U.S.A. (CA), Mexico Asteraceae T 17.96(a) N/A
Deinandra increscens ssp. villosa Tarplant, Gaviota Flowering Plants U.S.A. (CA) Asteraceae E 17.96(a) N/A
Delissea rhytidosperma No common name Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Delissea rivularis Oha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Delissea subcordata Oha Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Delissea undulata No common name Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Delphinium bakeri Larkspur, Baker's Flowering Plants U.S.A. (CA) Ranunculaceae E 17.96(a) N/A
Delphinium luteum Larkspur, yellow Flowering Plants U.S.A. (CA) Ranunculaceae E 17.96(a) N/A
Delphinium variegatum ssp. kinkiense Larkspur, San Clemente Island Flowering Plants U.S.A. (CA) Ranunculaceae E N/A N/A
Dicerandra christmanii Mint, Garrett's Flowering Plants U.S.A. (FL) Lamiaceae E N/A N/A
Dicerandra cornutissima Mint, longspurred Flowering Plants U.S.A. (FL) Lamiaceae E N/A N/A
Dicerandra frutescens Mint, scrub Flowering Plants U.S.A. (FL) Lamiaceae E N/A N/A
Dicerandra immaculata Mint, Lakela's Flowering Plants U.S.A. (FL) Lamiaceae E N/A N/A
Diellia erecta Diellia, asplenium-leaved Ferns and Allies U.S.A. (HI) Aspleniaceae E 17.96(a) N/A
Diellia falcata No common name Ferns and Allies U.S.A. (HI) Aspleniaceae E 17.96(a) N/A
Diellia mannii No common name Ferns and Allies U.S.A (HI) Aspleniaceae E 17.96(a) N/A
Diellia pallida No common name Ferns and Allies U.S.A. (HI) Aspleniaceae E 17.96(a) N/A
Diellia unisora No common name Ferns and Allies U.S.A. (HI) Aspleniaceae E 17.96(a) N/A
Diplazium molokaiense No common name Ferns and Allies U.S.A. (HI) Aspleniaceae E 17.96(a) N/A
Dodecahema leptoceras Spineflower, slender-horned Flowering Plants U.S.A. (CA) Polygonaceae E N/A N/A
Doryopteris angelica No common name Ferns and Allies U.S.A. (HI) Pteridaceae E 17.96(a) N/A
Doryopteris takeuchii No common name Ferns and Allies U.S.A. (HI) Pteridaceae E 17.96(a) N/A
Dryopteris crinalis var. podosorus aumakua, Palapalai Ferns and Allies U.S.A. (HI) Dryopteridaceae E 17.96(a) N/A
Dubautia herbstobatae Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dubautia imbricata imbricata Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dubautia kalalauensis Naenae Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dubautia kenwoodii Naenae Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dubautia latifolia Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dubautia pauciflorula Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dubautia plantaginea magnifolia Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dubautia plantaginea ssp. humilis Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dubautia waialealae Na`ena`e Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Dudleya abramsii ssp. parva Dudleya, Conejo Flowering Plants U.S.A. (CA) Crassulaceae T N/A N/A
Dudleya cymosa ssp. marcescens Dudleya, marcescent Flowering Plants U.S.A. (CA) Crassulaceae T N/A N/A
Dudleya cymosa ssp. ovatifolia Dudleyea, Santa Monica Mountains Flowering Plants U.S.A. (CA) Crassulaceae T N/A N/A
Dudleya nesiotica Dudleya, Santa Cruz Island Flowering Plants U.S.A. (CA) Crassulaceae T N/A N/A
Dudleya setchellii Dudleya, Santa Clara Valley Flowering Plants U.S.A. (CA) Crassulaceae E N/A N/A
Dudleya stolonifera Liveforever, Laguna Beach Flowering Plants U.S.A. (CA) Crassulaceae T N/A N/A
Dudleya traskiae Liveforever, Santa Barbara Island Flowering Plants U.S.A. (CA) Crassulaceae E N/A N/A
Dudleya verityi Dudleya, Verity's Flowering Plants U.S.A. (CA) Crassulaceae T N/A N/A
Echinacea laevigata Coneflower, smooth Flowering Plants U.S.A. (GA, MD, NC, PA, SC, VA) Asteraceae E N/A N/A
Echinocactus horizonthalonius var. nicholii Cactus, Nichol's Turk's head Flowering Plants U.S.A. (AZ) Cactaceae E N/A N/A
Echinocereus chisoensis var. chisoensis Cactus, Chisos Mountain hedgehog Flowering Plants U.S.A. (TX) Cactaceae T N/A N/A
Echinocereus fendleri var. kuenzleri Cactus, Kuenzler hedgehog Flowering Plants U.S.A. (NM) Cactaceae E N/A N/A
Echinocereus reichenbachii var. albertii Cactus, black lace Flowering Plants U.S.A. (TX) Cactaceae E N/A N/A
Echinocereus triglochidiatus var. arizonicus Cactus, Arizona hedgehog Flowering Plants U.S.A. (AZ) Cactaceae E N/A N/A
Echinocereus viridiflorus var. davisii Pitaya, Davis' green Flowering Plants U.S.A. (TX) Cactaceae E N/A N/A
Echinomastus mariposensis Cactus, Lloyd's Mariposa Flowering Plants U.S.A. (TX), Mexico (Coahuila) Cactaceae T N/A N/A
Elaphoglossum serpens No common name Ferns and Allies U.S.A. (PR) Lomariopsidaceae E N/A N/A
Enceliopsis nudicaulis var. corrugata Sunray, Ash Meadows Flowering Plants U.S.A. (NV) Asteraceae T 17.96(a) N/A
Eragrostis fosbergii Love grass, Fosberg's Flowering Plants U.S.A. (HI) Poaceae E 17.96(a) N/A
Eremalche kernensis Mallow, Kern Flowering Plants U.S.A. (CA) Malvaceae E N/A N/A
Eriastrum densifolium ssp. sanctorum Woolly-star, Santa Ana River Flowering Plants U.S.A. (CA) Polemoniaceae E N/A N/A
Erigeron decumbens var. decumbens Daisy, Willamette Flowering Plants U.S.A. (OR) Asteraceae E 17.96(a) N/A
Erigeron parishii Daisy, Parish's Flowering Plants U.S.A. (CA) Asteraceae T 17.96(a) N/A
Erigeron rhizomatus Fleabane, Zuni Flowering Plants U.S.A. (NM) Asteraceae T N/A N/A
Eriodictyon altissimum Mountain balm, Indian Knob Flowering Plants U.S.A. (CA) Hydrophyllaceae E N/A N/A
Eriodictyon capitatum Yerba santa, Lompoc Flowering Plants U.S.A. (CA) Hydrophyllaceae E 17.96(a) N/A
Eriogonum apricum (incl. var. prostratum) Buckwheat, Ione (incl. Irish Hill) Flowering Plants U.S.A. (CA) Polygonaceae E N/A N/A
Eriogonum gypsophilum Wild-buckwheat, gypsum Flowering Plants U.S.A. (NM) Polygonaceae T 17.96(a) N/A
Eriogonum kennedyi var. austromontanum Wild-buckwheat, southern mountain Flowering Plants U.S.A. (CA) Polygonaceae T 17.96(a) N/A
Eriogonum longifolium var. gnaphalifolium Buckwheat, scrub Flowering Plants U.S.A. (FL) Polygonaceae T N/A N/A
Eriogonum ovalifolium var. vineum Buckwheat, cushenbury Flowering Plants U.S.A. (CA) Polygonaceae E 17.96(a) N/A
Eriogonum ovalifolium var. williamsiae Buckwheat, steamboat Flowering Plants U.S.A. (NV) Polygonaceae E N/A N/A
Eriogonum pelinophilum wild buckwheat, clay-loving Flowering Plants U.S.A. (CO) Polygonaceae E 17.96(a) N/A
Eriophyllum latilobum Sunflower, San Mateo woolly Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Eryngium aristulatum var. parishii Button-celery, San Diego Flowering Plants U.S.A. (CA) Apiaceae E N/A N/A
Eryngium constancei Thistle, Loch Lomond coyote Flowering Plants U.S.A. (CA) Apiaceae E N/A N/A
Eryngium cuneifolium Snakeroot Flowering Plants U.S.A. (FL) Apiaceae E N/A N/A
Erysimum capitatum var. angustatum Wallflower, Contra Costa Flowering Plants U.S.A. (CA) Brassicaceae E 17.96(a) N/A
Erysimum menziesii Wallflower, Menzies' Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Erysimum teretifolium Wallflower, Ben Lomond Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Erythronium propullans Lily, Minnesota dwarf trout Flowering Plants U.S.A. (MN) Liliaceae E N/A N/A
Eugenia haematocarpa Uvillo Flowering Plants U.S.A. (PR) Myrtaceae E N/A N/A
Eugenia koolauensis Nioi Flowering Plants U.S.A. (HI) Myrtaceae E 17.96(a) N/A
Eugenia woodburyana No common name Flowering Plants U.S.A. (PR) Myrtaceae E N/A N/A
Euphorbia haeleeleana `Akoko Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Euphorbia telephioides Spurge, telephus Flowering Plants U.S.A. (FL) Euphorbiaceae T N/A N/A
Eutrema penlandii Mustard, Penland alpine fen Flowering Plants U.S.A. (CO) Brassicaceae T N/A N/A
Exocarpos luteolus Heau Flowering Plants U.S.A. (HI) Santalaceae E 17.96(a) N/A
Fitzroya cupressoides Larch, Chilean false Conifers and Cycads Chile, Argentina Cupressaceae T N/A N/A
Flueggea neowawraea Mehamehame Flowering Plants U.S.A. (HI) Euphorbiaceae E 17.96(a) N/A
Frankenia johnstonii Frankenia, Johnston's Flowering Plants U.S.A. (TX), Mexico (Nuevo Leon) Frankeniaceae E N/A N/A
Fremontodendron californicum ssp. decumbens Flannelbush, Pine Hill Flowering Plants U.S.A. (CA) Sterculiaceae E N/A N/A
Fremontodendron mexicanum Flannelbush, Mexican Flowering Plants U.S.A. (CA), Mexico Sterculiaceae E 17.96(a) N/A
Fritillaria gentneri Fritillary, Gentner's Flowering Plants U.S.A. (OR) Liliaceae E N/A N/A
Gahnia lanaiensis No common name Flowering Plants U.S.A. (HI) Cyperaceae E N/A N/A
Galactia smallii Milkpea, Small's Flowering Plants U.S.A. (FL) Fabaceae E N/A N/A
Galium buxifolium Bedstraw, island Flowering Plants U.S.A. (CA) Rubiaceae E N/A N/A
Galium californicum ssp. sierrae Bedstraw, El Dorado Flowering Plants U.S.A. (CA) Rubiaceae E N/A N/A
Gardenia brighamii Gardenia (=Na`u), Hawaiian Flowering Plants U.S.A. (HI) Rubiaceae E N/A N/A
Gardenia mannii Nanu Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Gaura neomexicana var. coloradensis Butterfly plant, Colorado Flowering Plants U.S.A. (CO, NE, WY) Onagraceae T 17.96(a) N/A
Geocarpon minimum No common name Flowering Plants U.S.A. (AR, LA, MO) Caryophyllaceae T N/A N/A
Geranium arboreum Geranium, Hawaiian red-flowered Flowering Plants U.S.A. (HI) Geraniaceae E 17.96(a) N/A
Geranium kauaiense Nohoanu Flowering Plants U.S.A. (HI) Geraniaceae E 17.96(a) N/A
Geranium multiflorum Nohoanu Flowering Plants U.S.A. (HI) Geraniaceae E 17.96(a) N/A
Gesneria pauciflora No common name Flowering Plants U.S.A. (PR) Gesneriaceae T N/A N/A
Geum radiatum Avens, spreading Flowering Plants U.S.A. (NC, TN) Rosaceae E N/A N/A
Gilia tenuiflora ssp. arenaria Gilia, Monterey Flowering Plants U.S.A. (CA) Polemoniaceae E N/A N/A
Gilia tenuiflora ssp. hoffmannii Gilia, Hoffmann's slender-flowered Flowering Plants U.S.A. (CA) Polemoniaceae E N/A N/A
Goetzea elegans Goetzea, beautiful Flowering Plants U.S.A. (PR) Solanaceae E N/A N/A
Gouania hillebrandii No common name Flowering Plants U.S.A. (HI) Rhamnaceae E 17.96(a) N/A
Gouania meyenii No common name Flowering Plants U.S.A. (HI) Rhamnaceae E 17.96(a) N/A
Gouania vitifolia No common name Flowering Plants U.S.A. (HI) Rhamnaceae E 17.96(a) N/A
Grindelia fraxino-pratensis Gumplant, Ash Meadows Flowering Plants U.S.A. (CA, NV) Asteraceae T 17.96(a) N/A
Gymnoderma lineare Lichen, rock gnome Lichens U.S.A. (NC,TN) Cladoniaceae E N/A N/A
Hackelia venusta Stickseed, showy Flowering Plants U.S.A. (WA) Boraginaceae E N/A N/A
Halophila johnsonii Seagrass, Johnson's Flowering Plants U.S.A. (FL) Hydrocharitaceae T 226.213 N/A
Haplostachys haplostachya Honohono Flowering Plants U.S.A. (HI) Lamiaceae E N/A N/A
Harperocallis flava Beauty, Harper's Flowering Plants U.S.A. (FL) Liliaceae E N/A N/A
Harrisia portoricensis Chumbo, Higo Flowering Plants U.S.A. (PR) Cactaceae T N/A N/A
Hedeoma todsenii Pennyroyal, Todsen's Flowering Plants U.S.A. (NM) Lamiaceae E 17.96(a) N/A
Hedyotis cookiana Awiwi Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Hedyotis coriacea Kio`ele Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Hedyotis degeneri No common name Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Hedyotis mannii Pilo Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Hedyotis parvula No common name Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Hedyotis purpurea var. montana Bluet, Roan Mountain Flowering Plants U.S.A. (NC, TN) Rubiaceae E N/A N/A
Hedyotis schlechtendahliana var. remyi Kopa Flowering Plants U.S.A. (HI) Rubiaceae E N/A N/A
Hedyotis st.-johnii Hedyotis, Na Pali beach Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Helenium virginicum Sneezeweed, Virginia Flowering Plants U.S.A. (MO, VA) Asteraceae T N/A N/A
Helianthemum greenei Rush-rose, island Flowering Plants U.S.A. (CA) Cistaceae T N/A N/A
Helianthus paradoxus Sunflower, Pecos (=puzzle, =paradox) Flowering Plants U.S.A. (NM, TX) Asteraceae T 17.96(a) N/A
Helianthus schweinitzii Sunflower, Schweinitz's Flowering Plants U.S.A. (NC, SC) Asteraceae E N/A N/A
Helonias bullata Pink, swamp Flowering Plants U.S.A. (DE, GA, MD, NC, NJ, NY, SC, VA) Liliaceae T N/A N/A
Hesperolinon congestum Dwarf-flax, Marin Flowering Plants U.S.A. (CA) Linaceae T N/A N/A
Hesperomannia arborescens No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Hesperomannia arbuscula No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Hesperomannia lydgatei No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Hexastylis naniflora Heartleaf, dwarf-flowered Flowering Plants U.S.A. (NC, SC) Aristolochiaceae T N/A N/A
Hibiscadelphus distans Kauai hau kuahiwi Flowering Plants U.S.A. (HI) Malvaceae E N/A N/A
Hibiscadelphus giffardianus Hau kuahiwi Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Hibiscadelphus hualalaiensis Hau kuahiwi Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Hibiscadelphus woodii Hau kuahiwi Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Hibiscus arnottianus ssp. immaculatus Koki`o ke`oke`o Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Hibiscus brackenridgei Ma`o hau hele, (=native yellow hibiscus) Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Hibiscus clayi Hibiscus, Clay's Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Hibiscus waimeae ssp. hannerae Koki`o ke`oke`o Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Hoffmannseggia tenella Rush-pea, slender Flowering Plants U.S.A. (TX) Fabaceae E N/A N/A
Holocarpha macradenia Tarplant, Santa Cruz Flowering Plants U.S.A. (CA) Asteraceae T 17.96(a) N/A
Howellia aquatilis Howellia, water Flowering Plants U.S.A. (CA, ID, MT, OR, WA) Campanulaceae T N/A N/A
Hudsonia montana Heather, mountain golden Flowering Plants U.S.A. (NC) Cistaceae T 17.96(a) N/A
Huperzia mannii Wawae`iole Ferns and Allies U.S.A. (HI) Lycopodiaceae E 17.96(a) N/A
Hymenoxys herbacea Daisy, lakeside Flowering Plants U.S.A. (IL, MI, OH), Canada (Ont.) Asteraceae T N/A N/A
Hymenoxys texana Dawn-flower, Texas prairie Flowering Plants U.S.A. (TX) Asteraceae E N/A N/A
Hypericum cumulicola Hypericum, highlands scrub Flowering Plants U.S.A. (FL) Hypericaceae E N/A N/A
Ilex cookii Holly, Cook's Flowering Plants U.S.A. (PR) Aquifoliaceae E N/A N/A
Ilex sintenisii No common name Flowering Plants U.S.A. (PR) Aquifoliaceae E N/A N/A
Iliamna corei Mallow, Peter's Mountain Flowering Plants U.S.A. (VA) Malvaceae E N/A N/A
Ipomopsis polyantha Skyrocket, Pagosa Flowering Plants U.S.A. (CO). Polemoniaceae E 17.96(a) N/A
Ipomopsis sancti-spiritus Ipomopsis, Holy Ghost Flowering Plants U.S.A. (NM) Polemoniaceae E N/A N/A
Iris lacustris Iris, dwarf lake Flowering Plants U.S.A. (MI, WI), Canada (Ont.) Iridaceae T N/A N/A
Ischaemum byrone Ischaemum, Hilo Flowering Plants U.S.A. (HI) Poaceae E 17.96(a) N/A
Isodendrion hosakae Aupaka Flowering Plants U.S.A. (HI) Violaceae E 17.96(a) N/A
Isodendrion laurifolium Aupaka Flowering Plants U.S.A. (HI) Violaceae E 17.96(a) N/A
Isodendrion longifolium Aupaka Flowering Plants U.S.A. (HI) Violaceae T 17.96(a) N/A
Isodendrion pyrifolium Kula wahine noho Flowering Plants U.S.A. (HI) Violaceae E 17.96(a) N/A
Isoetes louisianensis Quillwort, Louisiana Ferns and Allies U.S.A. (LA, MS) Isoetaceae E N/A N/A
Isoetes melanospora Quillwort, black spored Ferns and Allies U.S.A. (GA, SC) Isoetaceae E N/A N/A
Isoetes tegetiformans Quillwort, mat-forming Ferns and Allies U.S.A. (GA) Isoetaceae E N/A N/A
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 T N/A N/A
Ivesia kingii var. eremica Ivesia, Ash Meadows Flowering Plants U.S.A. (NV) Rosaceae T 17.96(a) N/A
Jacquemontia reclinata Jacquemontia, beach Flowering Plants U.S.A. (FL) Convolvulaceae E N/A N/A
Jatropha costaricensis Jatropha, Costa Rican Flowering Plants Costa Rica Euphorbiaceae E N/A N/A
Juglans jamaicensis Walnut (=Nogal), West Indian Flowering Plants U.S.A. (PR), Cuba, Hispaniola Juglandaceae E N/A N/A
Justicia cooleyi Water-willow, Cooley's Flowering Plants U.S.A. (FL) Acanthaceae E N/A N/A
Kanaloa kahoolawensis Kohe malama malama o kanaloa Flowering Plants U.S.A. (HI) Fabaceae E 17.96(a) N/A
Keysseria (=Lagenifera) erici No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Keysseria (=Lagenifera) helenae No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Kokia cookei Koki`o, Cooke's Flowering Plants U.S.A. (HI) Malvaceae E N/A N/A
Kokia drynarioides Koki`o Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Kokia kauaiensis Koki`o Flowering Plants U.S.A. (HI) Malvaceae E 17.96(a) N/A
Korthalsella degeneri Hulumoa Flowering Plants U.S.A. (HI) Viscaceae E 17.96(a) N/A
Labordia cyrtandrae Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae E 17.96(a) N/A
Labordia helleri Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae E 17.96(a) N/A
Labordia lydgatei Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae E 17.96(a) N/A
Labordia pumila Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae E 17.96(a) N/A
Labordia tinifolia var. lanaiensis Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae E N/A N/A
Labordia tinifolia var. wahiawaensis Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae E 17.96(a) N/A
Labordia triflora Kamakahala Flowering Plants U.S.A. (HI) Loganiaceae E 17.96(a) N/A
Lasthenia burkei Goldfields, Burke's Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Lasthenia conjugens Goldfields, Contra Costa Flowering Plants U.S.A. (CA) Asteraceae E 17.96(a) N/A
Layia carnosa Layia, beach Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Lepanthes eltoroensis No common name Flowering Plants U.S.A. (PR) Orchidaceae E N/A N/A
Lepidium arbuscula `Anaunau Flowering Plants U.S.A. (HI) Brassicaceae E 17.96(a) N/A
Lepidium barnebyanum Ridge-cress, Barneby Flowering Plants U.S.A. (UT) Brassicaceae E N/A N/A
Lepidium papilliferum Peppergrass, Slickspot Flowering Plants U.S.A. (ID) Brassicaceae T N/A N/A
Leptocereus grantianus No common name Flowering Plants U.S.A. (PR) Cactaceae E N/A N/A
Lespedeza leptostachya Bush-clover, prairie Flowering Plants U.S.A. (IA, IL, MN, WI) Fabaceae T N/A N/A
Lesquerella congesta Bladderpod, Dudley Bluffs Flowering Plants U.S.A. (CO) Brassicaceae T N/A N/A
Lesquerella kingii ssp. bernardina Bladderpod, San Bernardino Mountains Flowering Plants U.S.A. (CA) Brassicaceae E 17.96(a) N/A
Lesquerella lyrata Bladderpod, lyrate Flowering Plants U.S.A. (AL) Brassicaceae T N/A N/A
Lesquerella pallida Bladderpod, white Flowering Plants U.S.A. (TX) Brassicaceae E N/A N/A
Lesquerella perforata Bladderpod, Spring Creek Flowering Plants U.S.A. (TN) Brassicaceae E N/A N/A
Lesquerella thamnophila Bladderpod, Zapata Flowering Plants U.S.A. (TX) Brassicaceae E 17.96(a) N/A
Lesquerella tumulosa Bladderpod, kodachrome Flowering Plants U.S.A. (UT) Brassicaceae E N/A N/A
Lessingia germanorum (=L.g. var. germanorum) Lessingia, San Francisco Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Liatris helleri Blazingstar, Heller's Flowering Plants U.S.A. (NC) Asteraceae T N/A N/A
Liatris ohlingerae Blazingstar, scrub Flowering Plants U.S.A. (FL) Asteraceae E N/A N/A
Lilaeopsis schaffneriana var. recurva Water-umbel, Huachuca Flowering Plants U.S.A. (AZ), Mexico Apiaceae E 17.96(a) N/A
Lilium occidentale Lily, Western Flowering Plants U.S.A. (OR, CA) Liliaceae E N/A N/A
Lilium pardalinum ssp. pitkinense Lily, Pitkin Marsh Flowering Plants U.S.A. (CA) Liliaceae E N/A N/A
Limnanthes floccosa ssp. californica Meadowfoam, Butte County Flowering Plants U.S.A. (CA) Limnanthaceae E 17.96(a) N/A
Limnanthes floccosa ssp. grandiflora Meadowfoam, large-flowered woolly Flowering Plants U.S.A. (OR) Limnanthaceae E 17.96(a) N/A
Limnanthes vinculans Meadowfoam, Sebastopol Flowering Plants U.S.A. (CA) Limnanthaceae E N/A N/A
Lindera melissifolia Pondberry Flowering Plants U.S.A. (AL, AR, FL, GA, LA, MO, MS, NC, SC) Lauraceae E N/A N/A
Lipochaeta fauriei Nehe Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Lipochaeta kamolensis Nehe Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Lipochaeta lobata var. leptophylla Nehe Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Lipochaeta micrantha Nehe Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Lipochaeta tenuifolia Nehe Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Lipochaeta venosa No common name Flowering Plants U.S.A. (HI) Asteraceae E N/A N/A
Lipochaeta waimeaensis Nehe Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Lithophragma maximum Woodland-star, San Clemente Island Flowering Plants U.S.A. (CA) Saxifragaceae E N/A N/A
Lobelia gaudichaudii ssp. koolauensis No common name Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Lobelia monostachya No common name Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Lobelia niihauensis No common name Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Lobelia oahuensis No common name Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Lomatium bradshawii Desert-parsley, Bradshaw's Flowering Plants U.S.A. (OR,WA) Apiaceae E N/A N/A
Lomatium cookii Lomatium, Cook's Flowering Plants U.S.A. (OR) Apiaceae E 17.96(a) N/A
Lotus dendroideus ssp. traskiae Broom, San Clemente Island Flowering Plants U.S.A. (CA) Fabaceae E N/A N/A
Lupinus aridorum Lupine, scrub Flowering Plants U.S.A. (FL) Fabaceae E N/A N/A
Lupinus nipomensis Lupine, Nipomo Mesa Flowering Plants U.S.A. (CA) Fabaceae E N/A N/A
Lupinus sulphureus (=oreganus) ssp. kincaidii (=var. kincaidii) Lupine, Kincaid's Flowering Plants U.S.A. (OR, WA) Fabaceae T 17.96(a) N/A
Lupinus tidestromii Lupine, clover Flowering Plants U.S.A. (CA) Fabaceae E N/A N/A
Lycopodium (=Phlegmariurus) nutans Wawae`iole Ferns and Allies U.S.A. (HI) Lycopodiaceae E 17.96(a) N/A
Lyonia truncata var. proctorii No common name Flowering Plants U.S.A. (PR) Ericaceae E N/A N/A
Lysimachia asperulaefolia Loosestrife, rough-leaved Flowering Plants U.S.A. (NC, SC) Primulaceae E N/A N/A
Lysimachia daphnoides lehua makanoe Flowering Plants U.S.A. (HI) Myrsinaceae E 17.96(a) N/A
Lysimachia filifolia No common name Flowering Plants U.S.A. (HI) Primulaceae E 17.96(a) N/A
Lysimachia iniki No common name Flowering Plants U.S.A. (HI) Myrsinaceae E 17.96(a) N/A
Lysimachia lydgatei No common name Flowering Plants U.S.A. (HI) Primulaceae E 17.96(a) N/A
Lysimachia maxima No common name Flowering Plants U.S.A. (HI) Primulaceae E 17.96(a) N/A
Lysimachia pendens No common name Flowering Plants U.S.A. (HI) Myrsinaceae E 17.96(a) N/A
Lysimachia scopulensis No common name Flowering Plants U.S.A. (HI) Myrsinaceae E 17.96(a) N/A
Lysimachia venosa No common name Flowering Plants U.S.A. (HI) Primulaceae E 17.96(a) N/A
Macbridea alba Birds-in-a-nest, white Flowering Plants U.S.A. (FL) Lamiaceae T N/A N/A
Malacothamnus clementinus Bush-mallow, San Clemente Island Flowering Plants U.S.A. (CA) Malvaceae E N/A N/A
Malacothamnus fasciculatus var. nesioticus Bush-mallow, Santa Cruz Island Flowering Plants U.S.A. (CA) Malvaceae E N/A N/A
Malacothrix indecora Malacothrix, Santa Cruz Island Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Malacothrix squalida Malacothrix, island Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Manihot walkerae Manioc, Walker's Flowering Plants U.S.A. (TX), Mexico Euphorbiaceae E N/A N/A
Mariscus fauriei No common name Flowering Plants U.S.A. (HI) Cyperaceae E 17.96(a) N/A
Mariscus pennatiformis No common name Flowering Plants U.S.A. (HI) Cyperaceae E 17.96(a) N/A
Marshallia mohrii Button, Mohr's Barbara Flowering Plants U.S.A. (AL, GA) Asteraceae T N/A N/A
Marsilea villosa Ihi`ihi Ferns and Allies U.S.A. (HI) Marsileaceae E 17.96(a) N/A
Melicope adscendens Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope balloui Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope christophersenii Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope degeneri Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope haupuensis Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope hiiakae Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope knudsenii Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope lydgatei Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope makahae Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope mucronulata Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope munroi Alani Flowering Plants U.S.A. (HI) Rutaceae E N/A N/A
Melicope ovalis Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope pallida Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope paniculata Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope puberula Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope quadrangularis Alani Flowering Plants U.S.A. (HI) Rutaceae E N/A N/A
Melicope reflexa Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope saint-johnii Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Melicope zahlbruckneri Alani Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Mentzelia leucophylla Blazingstar, Ash Meadows Flowering Plants U.S.A. (NV) Loasaceae T 17.96(a) N/A
Mimulus michiganensis monkey-flower, Michigan Flowering Plants U.S.A. (MI) Scrophulariaceae E N/A N/A
Mirabilis macfarlanei Four-o'clock, MacFarlane's Flowering Plants U.S.A. (ID, OR) Nyctaginaceae T N/A N/A
Mitracarpus maxwelliae No common name Flowering Plants U.S.A. (PR) Rubiaceae E N/A N/A
Mitracarpus polycladus No common name Flowering Plants U.S.A. (PR), Saba Rubiaceae E N/A N/A
Monardella viminea Monardella, willowy Flowering Plants U.S.A. (CA), Mexico Lamiaceae E 17.96(a) N/A
Monolopia (=Lembertia) congdonii Wooly-threads, San Joaquin Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Munroidendron racemosum No common name Flowering Plants U.S.A. (HI) Araliaceae E 17.96(a) N/A
Myrcia paganii No common name Flowering Plants U.S.A. (PR) Myrtaceae E N/A N/A
Myrsine juddii Kolea Flowering Plants U.S.A. (HI) Myrsinaceae E 17.96(a) N/A
Myrsine knudsenii Kolea Flowering Plants U.S.A. (HI) Myrsinaceae E 17.96(a) N/A
Myrsine linearifolia Kolea Flowering Plants U.S.A. (HI) Myrsinaceae T 17.96(a) N/A
Myrsine mezii Kolea Flowering Plants U.S.A. (HI) Myrsinaceae E 17.96(a) N/A
Navarretia fossalis Navarretia, spreading Flowering Plants U.S.A. (CA), Mexico (Baja California) Polemoniaceae T 17.96(a) N/A
Navarretia leucocephala ssp. pauciflora (=N. pauciflora) Navarretia, few-flowered Flowering Plants U.S.A. (CA) Polemoniaceae E N/A N/A
Navarretia leucocephala ssp. plieantha Navarretia, many-flowered Flowering Plants U.S.A. (CA) Polemoniaceae E N/A N/A
Neostapfia colusana Grass, Colusa Flowering Plants U.S.A. (CA) Poaceae T 17.96(a) N/A
Neraudia angulata No common name Flowering Plants U.S.A. (HI) Urticaceae E 17.96(a) N/A
Neraudia ovata No common name Flowering Plants U.S.A. (HI) Urticaceae E 17.96(a) N/A
Neraudia sericea No common name Flowering Plants U.S.A. (HI) Urticaceae E 17.96(a) N/A
Nesogenes rotensis No common name Flowering Plants U.S.A. (MP) Verbenaceae E N/A N/A
Nitrophila mohavensis Niterwort, Amargosa Flowering Plants U.S.A. (CA, NV) Chenopodiaceae E 17.96(a) N/A
Nolina brittoniana Beargrass, Britton's Flowering Plants U.S.A. (FL) Agavaceae E N/A N/A
Nothocestrum breviflorum `Aiea Flowering Plants U.S.A. (HI) Solanaceae E 17.96(a) N/A
Nothocestrum peltatum `Aiea Flowering Plants U.S.A. (HI) Solanaceae E 17.96(a) N/A
Nototrichium humile Kulu`i Flowering Plants U.S.A. (HI) Amaranthaceae E 17.96(a) N/A
Ochrosia kilaueaensis Holei Flowering Plants U.S.A. (HI) Apocynaceae E N/A N/A
Oenothera avita ssp. eurekensis Evening-primrose, Eureka Valley Flowering Plants U.S.A. (CA) Onagraceae E N/A N/A
Oenothera deltoides ssp. howellii Evening-primrose, Antioch Dunes Flowering Plants U.S.A. (CA) Onagraceae E 17.96(a) N/A
Opuntia treleasei Cactus, Bakersfield Flowering Plants U.S.A. (CA) Cactaceae E N/A N/A
Orcuttia californica Orcutt grass, California Flowering Plants U.S.A. (CA) Poaceae E N/A N/A
Orcuttia inaequalis Orcutt grass, San Joaquin Flowering Plants U.S.A. (CA) Poaceae T 17.96(a) N/A
Orcuttia pilosa Orcutt grass, hairy Flowering Plants U.S.A. (CA) Poaceae E 17.96(a) N/A
Orcuttia tenuis Orcutt grass, slender Flowering Plants U.S.A. (CA) Poaceae T 17.96(a) N/A
Orcuttia viscida Orcutt grass, Sacramento Flowering Plants U.S.A. (CA) Poaceae E 17.96(a) N/A
Osmoxylon mariannense No common name Flowering Plants U.S.A. (MP) Araliaceae E N/A N/A
Ottoschulzia rhodoxylon Palo de rosa Flowering Plants U.S.A. (PR), Dominican Republic Icacinaceae E N/A N/A
Oxypolis canbyi Dropwort, Canby's Flowering Plants U.S.A. (DE, GA, MD, NC, SC) Apiaceae E N/A N/A
Oxytheca parishii var. goodmaniana Oxytheca, cushenbury Flowering Plants U.S.A. (CA) Polygonaceae E 17.96(a) N/A
Oxytropis campestris var. chartacea Locoweed, Fassett's Flowering Plants U.S.A. (WI) Fabaceae T N/A N/A
Packera franciscana Ragwort, San Francisco Peaks Flowering Plants U.S.A. (AZ) Asteraceae T 17.96(a) N/A
Panicum fauriei var. carteri Panicgrass, Carter's Flowering Plants U.S.A. (HI) Poaceae E 17.96(a) N/A
Panicum niihauense Lau `ehu Flowering Plants U.S.A. (HI) Poaceae E 17.96(a) N/A
Paronychia chartacea Whitlow-wort, papery Flowering Plants U.S.A. (FL) Caryophyllaceae T N/A N/A
Parvisedum leiocarpum Stonecrop, Lake County Flowering Plants U.S.A. (CA) Crassulaceae E N/A N/A
Pedicularis furbishiae Lousewort, Furbish Flowering Plants U.S.A. (ME), Canada (N.B.) Scrophulariaceae E N/A N/A
Pediocactus bradyi Cactus, Brady pincushion Flowering Plants U.S.A. (AZ) Cactaceae E N/A N/A
Pediocactus despainii Cactus, San Rafael Flowering Plants U.S.A. (UT) Cactaceae E N/A N/A
Pediocactus (=Echinocactus,=Utahia) sileri Cactus, Siler pincushion Flowering Plants U.S.A. (AZ, UT) Cactaceae T N/A N/A
Pediocactus knowltonii Cactus, Knowlton's Flowering Plants U.S.A. (CO, NM) Cactaceae E N/A N/A
Pediocactus peeblesianus var. peeblesianus Cactus, Peebles Navajo Flowering Plants U.S.A. (AZ) Cactaceae E N/A N/A
Pediocactus winkleri Cactus, Winkler Flowering Plants U.S.A. (UT) Cactaceae T N/A N/A
Penstemon debilis beardtongue, Parachute Flowering Plants U.S.A. (CO) Plantaginaceae T 17.96(a) N/A
Penstemon haydenii Penstemon, blowout Flowering Plants Nebraska and Wyoming Scrophulariaceae E N/A N/A
Penstemon penlandii Beardtongue, Penland Flowering Plants U.S.A. (CO) Scrophulariaceae E N/A N/A
Pentachaeta bellidiflora Pentachaeta, white-rayed Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Pentachaeta lyonii Pentachaeta, Lyon's Flowering Plants U.S.A. (CA) Asteraceae E 17.96(a) N/A
Peperomia wheeleri Peperomia, Wheeler's Flowering Plants U.S.A. (PR) Piperaceae E N/A N/A
Peucedanum sandwicense Makou Flowering Plants U.S.A. (HI) Apiaceae T 17.96(a) N/A
Phacelia argillacea Phacelia, clay Flowering Plants U.S.A. (UT) Hydrophyllaceae E N/A N/A
Phacelia formosula Phacelia, North Park Flowering Plants U.S.A. (CO) Hydrophyllaceae E N/A N/A
Phacelia insularis ssp. insularis Phacelia, island Flowering Plants U.S.A. (CA) Hydrophyllaceae E N/A N/A
Phacelia submutica Phacelia, DeBeque Flowering Plants U.S.A. (CO) Hydrophyllaceae T 17.96(a) N/A
Phlox hirsuta Phlox, Yreka Flowering Plants U.S.A. (CA) Polemoniaceae E N/A N/A
Phlox nivalis ssp. texensis Phlox, Texas trailing Flowering Plants U.S.A. (TX) Polemoniaceae E N/A N/A
Phyllostegia glabra var. lanaiensis No common name Flowering Plants U.S.A. (HI) Lamiaceae E N/A N/A
Phyllostegia hirsuta No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia hispida No common name Flowering Plants U.S.A. (HI) Lamiaceae E N/A N/A
Phyllostegia kaalaensis No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia knudsenii No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia mannii No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia mollis No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia parviflora No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia racemosa Kiponapona Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia renovans No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia velutina No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia waimeae No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia warshaueri No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Phyllostegia wawrana No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Physaria filiformis bladderpod, Missouri Flowering Plants U.S.A. (AR, MO) Brassicaceae T N/A N/A
Physaria obcordata Twinpod, Dudley Bluffs Flowering Plants U.S.A. (CO) Brassicaceae T N/A N/A
Pilosocereus robinii Cactus, Key tree Flowering Plants U.S.A. (FL), Cuba Cactaceae E N/A N/A
Pinguicula ionantha Butterwort, Godfrey's Flowering Plants U.S.A. (FL) Lentibulariaceae T N/A N/A
Piperia yadonii Piperia, Yadon's Flowering Plants U.S.A. (CA) Orchidaceae E 17.96(a) N/A
Pittosporum napaliense Ho`awa Flowering Plants U.S.A. (HI) Pittosporaceae E 17.96(a) N/A
Pityopsis ruthii Aster, Ruth's golden Flowering Plants U.S.A. (TN) Asteraceae E N/A N/A
Plagiobothrys hirtus popcornflower, rough Flowering Plants U.S.A. (OR) Boraginaceae E N/A N/A
Plagiobothrys strictus Allocarya, Calistoga Flowering Plants U.S.A. (CA) Boraginaceae E N/A N/A
Plantago hawaiensis Kuahiwi laukahi Flowering Plants U.S.A. (HI) Plantaginaceae E 17.96(a) N/A
Plantago princeps Kuahiwi laukahi Flowering Plants U.S.A. (HI) Plantaginaceae E 17.96(a) N/A
Platanthera holochila No common name Flowering Plants U.S.A. (HI) Orchidaceae E 17.96(a) N/A
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 T N/A N/A
Platanthera praeclara Orchid, western prairie fringed Flowering Plants U.S.A. (IA, KS, MN, MO, ND, NE, OK, SD), Canada (Man.) Orchidaceae T N/A N/A
Platydesma cornuta cornuta No common name Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Platydesma cornuta decurrens No common name Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Platydesma rostrata Pilo kea lau li`i Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Pleodendron macranthum Chupacallos Flowering Plants U.S.A. (PR) Canellaceae E N/A N/A
Pleomele forbesii Hala pepe Flowering Plants U.S.A. (HI) Agavaceae E 17.96(a) N/A
Pleomele hawaiiensis Hala pepe Flowering Plants U.S.A. (HI) Liliaceae E 17.96(a) N/A
Poa atropurpurea Bluegrass, San Bernardino Flowering Plants U.S.A. (CA) Poaceae E 17.96(a) N/A
Poa mannii Bluegrass, Mann's Flowering Plants U.S.A. (HI) Poaceae E 17.96(a) N/A
Poa napensis Bluegrass, Napa Flowering Plants U.S.A. (CA) Poaceae E N/A N/A
Poa sandvicensis Bluegrass, Hawaiian Flowering Plants U.S.A. (HI) Poaceae E 17.96(a) N/A
Poa siphonoglossa No common name Flowering Plants U.S.A. (HI) Poaceae E 17.96(a) N/A
Pogogyne abramsii Mesa-mint, San Diego Flowering Plants U.S.A. (CA) Lamiaceae E N/A N/A
Pogogyne nudiuscula Mesa-mint, Otay Flowering Plants U.S.A. (CA), Mexico (Baja California) Lamiaceae E N/A N/A
Polygala lewtonii Polygala, Lewton's Flowering Plants U.S.A. (FL) Polygalaceae E N/A N/A
Polygala smallii Polygala, tiny Flowering Plants U.S.A. (FL) Polygalaceae E N/A N/A
Polygonella basiramia Wireweed Flowering Plants U.S.A. (FL) Polygonaceae E N/A N/A
Polygonella myriophylla Sandlace Flowering Plants U.S.A. (FL) Polygonaceae E N/A N/A
Polygonum hickmanii Polygonum, Scotts Valley Flowering Plants U.S.A. (CA) Polygonaceae E 17.96(a) N/A
Polystichum aleuticum Fern, Aleutian shield Ferns and Allies U.S.A. (AK) Dryopteridaceae E N/A N/A
Polystichum calderonense No common name Ferns and Allies U.S.A. (PR) Dryopteridaceae E N/A N/A
Portulaca sclerocarpa Po`e Flowering Plants U.S.A. (HI) Portulacaceae E 17.96(a) N/A
Potamogeton clystocarpus Pondweed, Little Aguja (=Creek) Flowering Plants U.S.A. (TX) Potamogetonaceae E N/A N/A
Potentilla hickmanii Potentilla, Hickman's Flowering Plants U.S.A. (CA) Rosaceae E N/A N/A
Primula maguirei Primrose, Maguire Flowering Plants U.S.A. (UT) Primulaceae T N/A N/A
Pritchardia affinis Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae E N/A N/A
Pritchardia aylmer-robinsonii Wahane Flowering Plants U.S.A. (HI) Arecaceae E N/A N/A
Pritchardia hardyi Lo`ulu, (=Na`ena`e) Flowering Plants U.S.A. (HI) Asteraceae E N/A N/A
Pritchardia kaalae Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae E N/A N/A
Pritchardia munroi Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae E 17.96(a) N/A
Pritchardia napaliensis Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae E N/A N/A
Pritchardia remota Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae E 17.96(a) N/A
Pritchardia schattaueri Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae E N/A N/A
Pritchardia viscosa Lo`ulu Flowering Plants U.S.A. (HI) Arecaceae E N/A N/A
Prunus geniculata Plum, scrub Flowering Plants U.S.A. (FL) Rosaceae E N/A N/A
Pseudobahia bahiifolia Sunburst, Hartweg's golden Flowering Plants U.S.A. (CA) Asteraceae E N/A N/A
Pseudobahia peirsonii Sunburst, San Joaquin adobe Flowering Plants U.S.A. (CA) Asteraceae T N/A N/A
Psychotria grandiflora Kopiko Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Psychotria hexandra ssp. oahuensis wild coffee, Oahu (=kopiko) Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Psychotria hobdyi Kopiko Flowering Plants U.S.A. (HI) Rubiaceae E 17.96(a) N/A
Pteralyxia kauaiensis Kaulu Flowering Plants U.S.A. (HI) Apocynaceae E 17.96(a) N/A
Pteralyxia macrocarpa Kaulu Flowering Plants U.S.A. (HI) Apocynaceae E 17.96(a) N/A
Pteris lidgatei No common name Ferns and Allies U.S.A. (HI) Adiantaceae E 17.96(a) N/A
Ptilimnium nodosum Harperella Flowering Plants U.S.A. (AL, AR, GA, MD, NC, SC, WV) Apiaceae E N/A N/A
Purshia (=Cowania) subintegra Cliff-rose, Arizona Flowering Plants U.S.A. (AZ) Rosaceae E N/A N/A
Quercus hinckleyi Oak, Hinckley Flowering Plants U.S.A. (TX) Fagaceae T N/A N/A
Ranunculus aestivalis (=acriformis) Buttercup, autumn Flowering Plants U.S.A. (UT) Ranunculaceae E N/A N/A
Remya kauaiensis No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Remya mauiensis Remya, Maui Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Remya montgomeryi No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Rhodiola integrifolia ssp. leedyi roseroot, Leedy's Flowering Plants U.S.A. (MN, NY) Crassulaceae T N/A N/A
Rhododendron chapmanii Rhododendron, Chapman Flowering Plants U.S.A. (FL) Ericaceae E N/A N/A
Rhus michauxii Sumac, Michaux's Flowering Plants U.S.A. (GA, NC, SC, VA) Anacardiaceae E N/A N/A
Rhynchospora knieskernii Beaked-rush, Knieskern's Flowering Plants U.S.A. (DE, NJ) Cyperaceae T N/A N/A
Ribes echinellum Gooseberry, Miccosukee Flowering Plants U.S.A. (FL, SC) Saxifragaceae T N/A N/A
Rorippa gambellii Watercress, Gambel's Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Sagittaria fasciculata Arrowhead, bunched Flowering Plants U.S.A. (NC, SC) Alismataceae E N/A N/A
Sagittaria secundifolia Water-plantain, Kral's Flowering Plants U.S.A. (AL, GA) Alismataceae T N/A N/A
Sanicula mariversa No common name Flowering Plants U.S.A. (HI) Apiaceae E 17.96(a) N/A
Sanicula purpurea No common name Flowering Plants U.S.A. (HI) Apiaceae E 17.96(a) N/A
Santalum freycinetianum var. lanaiense Sandalwood, Lanai (=`iliahi) Flowering Plants U.S.A. (HI) Santalaceae E N/A N/A
Sarracenia oreophila Pitcher-plant, green Flowering Plants U.S.A. (AL, GA, NC, TN) Sarraceniaceae E N/A N/A
Sarracenia rubra alabamensis Pitcher-plant, Alabama canebrake Flowering Plants U.S.A. (AL) Sarraceniaceae E N/A N/A
Sarracenia rubra ssp. jonesii Pitcher-plant, mountain sweet Flowering Plants U.S.A. (NC, SC) Sarraceniaceae E N/A N/A
Scaevola coriacea Naupaka, dwarf Flowering Plants U.S.A. (HI) Goodeniaceae E N/A N/A
Schiedea adamantis Schiedea, Diamond Head Flowering Plants U.S.A. (HI) Caryophyllaceae E N/A N/A
Schiedea apokremnos Ma`oli`oli Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea attenuata No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea haleakalensis No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea helleri No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea hookeri No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea kaalae No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea kauaiensis No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea kealiae Ma`oli`oli Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea lydgatei No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea membranacea No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea nuttallii No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea sarmentosa No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea spergulina var. leiopoda No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea spergulina var. spergulina No common name Flowering Plants U.S.A. (HI) Caryophyllaceae T 17.96(a) N/A
Schiedea stellarioides Laulihilihi Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schiedea verticillata No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Schoenocrambe argillacea Reed-mustard, clay Flowering Plants U.S.A. (UT) Brassicaceae T N/A N/A
Schoenocrambe barnebyi Reed-mustard, Barneby Flowering Plants U.S.A. (UT) Brassicaceae E N/A N/A
Schoenocrambe suffrutescens Reed-mustard, shrubby Flowering Plants U.S.A. (UT) Brassicaceae E N/A N/A
Schoepfia arenaria No common name Flowering Plants U.S.A. (PR) Olacaceae T N/A N/A
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 E N/A N/A
Scirpus ancistrochaetus Bulrush, Northeastern Flowering Plants U.S.A. (MA, MD, NH, NY, PA, VA, VT, WV) Cyperaceae E N/A N/A
Sclerocactus brevihamatus ssp. tobuschii cactus, Tobusch fishhook Flowering Plants U.S.A. (TX) Cactaceae E N/A N/A
Sclerocactus brevispinus cactus, Pariette Flowering Plants U.S.A. (UT) Cacatacea T N/A N/A
Sclerocactus glaucus Cactus, Colorado hookless Flowering Plants U.S.A. (CO, UT) Cactaceae T N/A N/A
Sclerocactus mesae-verdae Cactus, Mesa Verde Flowering Plants U.S.A. (CO, NM) Cactaceae T N/A N/A
Sclerocactus wetlandicus cactus, Uinta Basin hookless Flowering Plants Cactaceae T N/A N/A
Sclerocactus wrightiae Cactus, Wright fishhook Flowering Plants U.S.A. (UT) Cactaceae E N/A N/A
Scutellaria floridana Skullcap, Florida Flowering Plants U.S.A. (FL) Lamiaceae T N/A N/A
Scutellaria montana Skullcap, large-flowered Flowering Plants U.S.A. (GA, TN) Lamiaceae T N/A N/A
Senecio layneae Butterweed, Layne's Flowering Plants U.S.A. (CA) Asteraceae T N/A N/A
Serianthes nelsonii Iagu, Hayun (=(Guam), Tronkon guafi (Rota)) Flowering Plants Western Pacific Ocean-U.S.A. (GU, MP-Rota) Fabaceae E N/A N/A
Sesbania tomentosa Ohai Flowering Plants U.S.A. (HI) Fabaceae E 17.96(a) N/A
Sibara filifolia Rockcress, Santa Cruz Island Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Sicyos alba `Anunu Flowering Plants U.S.A. (HI) Cucurbitaceae E 17.96(a) N/A
Sidalcea keckii Checker-mallow, Keck's Flowering Plants U.S.A. (CA) Malvaceae E 17.96(a) N/A
Sidalcea nelsoniana Checker-mallow, Nelson's Flowering Plants U.S.A. (OR, WA) Malvaceae T N/A N/A
Sidalcea oregana ssp. valida Checker-mallow, Kenwood Marsh Flowering Plants U.S.A. (CA) Malvaceae E N/A N/A
Sidalcea oregana var. calva Checkermallow, Wenatchee Mountains Flowering Plants U.S.A. (WA) Malvaceae E 17.96(a) N/A
Sidalcea pedata Checker-mallow, pedate Flowering Plants U.S.A. (CA) Malvaceae E N/A N/A
Silene alexandri No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Silene hawaiiensis No common name Flowering Plants U.S.A. (HI) Caryophyllaceae T 17.96(a) N/A
Silene lanceolata No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Silene perlmanii No common name Flowering Plants U.S.A. (HI) Caryophyllaceae E 17.96(a) N/A
Silene polypetala Campion, fringed Flowering Plants U.S.A. (FL, GA) Caryophyllaceae E N/A N/A
Silene spaldingii Catchfly, Spalding's Flowering Plants U.S.A. (ID, MT, OR, WA) Caryophyllaceae T N/A N/A
Sisyrinchium dichotomum Irisette, white Flowering Plants U.S.A. (NC) Iridaceae E N/A N/A
Solanum drymophilum Erubia Flowering Plants U.S.A. (PR) Solanaceae E N/A N/A
Solanum incompletum Popolo ku mai Flowering Plants U.S.A. (HI) Solanaceae E 17.96(a) N/A
Solanum sandwicense `Aiakeakua, popolo Flowering Plants U.S.A. (HI) Solanaceae E 17.96(a) N/A
Solidago albopilosa Goldenrod, white-haired Flowering Plants U.S.A. (KY) Asteraceae T N/A N/A
Solidago houghtonii Goldenrod, Houghton's Flowering Plants U.S.A. (MI), Canada (Ont.) Asteraceae T N/A N/A
Solidago shortii Goldenrod, Short's Flowering Plants U.S.A. (KY) Asteraceae E N/A N/A
Solidago spithamaea Goldenrod, Blue Ridge Flowering Plants U.S.A. (NC, TN) Asteraceae T N/A N/A
Spermolepis hawaiiensis No common name Flowering Plants U.S.A. (HI) Apiaceae E 17.96(a) N/A
Spigelia gentianoides Pinkroot, gentian Flowering Plants U.S.A. (AL, FL) Loganiaceae E N/A N/A
Spiraea virginiana Spiraea, Virginia Flowering Plants U.S.A. (GA, KY, NC, OH, PA, TN, VA, WV) Rosaceae T N/A N/A
Spiranthes delitescens Ladies'-tresses, Canelo Hills Flowering Plants U.S.A. (AZ) Orchidaceae E N/A N/A
Spiranthes diluvialis Ladies'-tresses, Ute Flowering Plants U.S.A. (CO, ID, MT, NE, NV, UT, WA, WY) Orchidaceae T N/A N/A
Spiranthes parksii Ladies'-tresses, Navasota Flowering Plants U.S.A. (TX) Orchidaceae E N/A N/A
Stahlia monosperma Cobana negra Flowering Plants U.S.A. (PR), Dominican Republic Fabaceae T N/A N/A
Stenogyne angustifolia angustifolia No common name Flowering Plants U.S.A. (HI) Lamiaceae E N/A N/A
Stenogyne bifida No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Stenogyne campanulata No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Stenogyne kanehoana No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Stenogyne kealiae No common name Flowering Plants U.S.A. (HI) Lamiaceae E 17.96(a) N/A
Stephanomeria malheurensis Wire-lettuce, Malheur Flowering Plants U.S.A. (OR) Asteraceae E 17.96(a) N/A
Streptanthus albidus ssp. albidus Jewelflower, Metcalf Canyon Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Streptanthus niger Jewelflower, Tiburon Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Styrax portoricensis Palo de jazmin Flowering Plants U.S.A. (PR) Styracaceae E N/A N/A
Styrax texanus Snowbells, Texas Flowering Plants U.S.A. (TX) Styracaceae E N/A N/A
Suaeda californica Seablite, California Flowering Plants U.S.A. (CA) Chenopodiaceae E N/A N/A
Swallenia alexandrae Grass, Eureka Dune Flowering Plants U.S.A. (CA) Poaceae E N/A N/A
Taraxacum californicum Taraxacum, California Flowering Plants U.S.A. (CA) Asteraceae E 17.96(a) N/A
Tectaria estremerana No common name Ferns and Allies U.S.A. (PR) Dryopteridaceae E N/A N/A
Ternstroemia luquillensis Palo colorado Flowering Plants U.S.A. (PR) Theaceae E N/A N/A
Ternstroemia subsessilis No common name Flowering Plants U.S.A. (PR) Theaceae E N/A N/A
Tetramolopium arenarium No common name Flowering Plants U.S.A. (HI) Asteraceae E N/A N/A
Tetramolopium capillare Pamakani Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Tetramolopium filiforme No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Tetramolopium lepidotum ssp. lepidotum No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Tetramolopium remyi No common name Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Tetramolopium rockii No common name Flowering Plants U.S.A. (HI) Asteraceae T 17.96(a) N/A
Tetraplasandra bisattenuata No common name Flowering Plants U.S.A. (HI) Araliaceae E 17.96(a) N/A
Tetraplasandra flynnii No common name Flowering Plants U.S.A. (HI) Araliaceae E 17.96(a) N/A
Tetraplasandra gymnocarpa `Ohe`ohe Flowering Plants U.S.A. (HI) Araliaceae E 17.96(a) N/A
Tetraplasandra lydgatei No common name Flowering Plants Araliaceae E 17.96(a) N/A
Thalictrum cooleyi Meadowrue, Cooley's Flowering Plants U.S.A. (FL, NC) Ranunculaceae E N/A N/A
Thelypodium howellii spectabilis Thelypody, Howell's spectacular Flowering Plants U.S.A. (OR) Brassicaceae T N/A N/A
Thelypodium stenopetalum Mustard, slender-petaled Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Thelypteris inabonensis No common name Ferns and Allies U.S.A. (PR) Thelypteridaceae E N/A N/A
Thelypteris pilosa var. alabamensis Fern, Alabama streak-sorus Ferns and Allies U.S.A. (AL) Thelypteridaceae T N/A N/A
Thelypteris verecunda No common name Ferns and Allies U.S.A. (PR) Thelypteridaceae E N/A N/A
Thelypteris yaucoensis No common name Ferns and Allies U.S.A. (PR) Thelypteridaceae E N/A N/A
Thlaspi californicum Penny-cress, Kneeland Prairie Flowering Plants U.S.A. (CA) Brassicaceae E 17.96(a) N/A
Thymophylla tephroleuca Dogweed, ashy Flowering Plants U.S.A. (TX) Asteraceae E N/A N/A
Thysanocarpus conchuliferus Fringepod, Santa Cruz Island Flowering Plants U.S.A. (CA) Brassicaceae E N/A N/A
Torreya taxifolia Torreya, Florida Conifers and Cycads U.S.A. (FL, GA) Taxaceae E N/A N/A
Townsendia aprica Townsendia, Last Chance Flowering Plants U.S.A. (UT) Asteraceae T N/A N/A
Trematolobelia singularis No common name Flowering Plants U.S.A. (HI) Campanulaceae E 17.96(a) N/A
Trichilia triacantha Bariaco Flowering Plants U.S.A. (PR) Meliaceae E N/A N/A
Trichostema austromontanum ssp. compactum Bluecurls, Hidden Lake Flowering Plants U.S.A. (CA) Lamiaceae T N/A N/A
Trifolium amoenum Clover, showy Indian Flowering Plants U.S.A. (CA) Fabaceae E N/A N/A
Trifolium stoloniferum Clover, running buffalo Flowering Plants U.S.A. (AR, IL, IN, KS, KY, MO, OH, WV) Fabaceae E N/A N/A
Trifolium trichocalyx Clover, Monterey Flowering Plants U.S.A. (CA) Fabaceae E N/A N/A
Trillium persistens Trillium, persistent Flowering Plants U.S.A. (GA, SC) Liliaceae E N/A N/A
Trillium reliquum Trillium, relict Flowering Plants U.S.A. (AL, GA, SC) Liliaceae E N/A N/A
Tuctoria greenei Tuctoria, Greene's Flowering Plants U.S.A. (CA Poaceae E 17.96(a) N/A
Tuctoria mucronata Grass, Solano Flowering Plants U.S.A. (CA) Poaceae E 17.96(a) N/A
Urera kaalae Opuhe Flowering Plants U.S.A. (HI) Urticaceae E 17.96(a) N/A
Verbena californica Vervain, Red Hills Flowering Plants U.S.A. (CA) Verbenaceae T N/A N/A
Verbesina dissita Crownbeard, big-leaved Flowering Plants U.S.A. (CA), Mexico. Asteraceae T N/A N/A
Vernonia proctorii No common name Flowering Plants U.S.A. (PR) Asteraceae E N/A N/A
Vicia menziesii Vetch, Hawaiian Flowering Plants U.S.A. (HI) Fabaceae E N/A N/A
Vigna o-wahuensis No common name Flowering Plants U.S.A. (HI) Fabaceae E 17.96(a) N/A
Viola chamissoniana ssp. chamissoniana Pamakani Flowering Plants U.S.A. (HI) Violaceae E 17.96(a) N/A
Viola helenae No common name Flowering Plants U.S.A. (HI) Violaceae E 17.96(a) N/A
Viola kauaiensis var. wahiawaensis Nani wai`ale`ale Flowering Plants U.S.A. (HI) Violaceae E 17.96(a) N/A
Viola lanaiensis No common name Flowering Plants U.S.A. (HI) Violaceae E N/A N/A
Viola oahuensis No common name Flowering Plants U.S.A. (HI) Violaceae E 17.96(a) N/A
Warea amplexifolia Warea, wide-leaf Flowering Plants U.S.A. (FL) Brassicaceae E N/A N/A
Warea carteri Mustard, Carter's Flowering Plants U.S.A. (FL) Brassicaceae E N/A N/A
Wilkesia hobdyi Iliau, dwarf Flowering Plants U.S.A. (HI) Asteraceae E 17.96(a) N/A
Xylosma crenatum No common name Flowering Plants U.S.A. (HI) Flacourtiaceae E 17.96(a) N/A
Xyris tennesseensis Grass, Tennessee yellow-eyed Flowering Plants U.S.A. (AL, GA, TN) Xyridaceae E N/A N/A
Yermo xanthocephalus Yellowhead, desert Flowering Plants U.S.A. (WY) Asteraceae T 17.96(a) N/A
Zanthoxylum dipetalum var. tomentosum A`e Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Zanthoxylum hawaiiense A`e Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Zanthoxylum oahuense A`e Flowering Plants U.S.A. (HI) Rutaceae E 17.96(a) N/A
Zanthoxylum thomasianum Prickly-ash, St. Thomas Flowering Plants U.S.A. (PR, VI) Rutaceae E N/A N/A
Zizania texana Wild-rice, Texas Flowering Plants U.S.A. (TX) Poaceae E 17.96(a) N/A
Ziziphus celata Ziziphus, Florida Flowering Plants U.S.A. (FL) Rhamnaceae E N/A N/A
Last updated: February 18, 2013