(a) The list in this section contains the names of all species of plants which have been determined by the Services to be Endangered or Threatened. It also contains the names of species of plants treated as Endangered or Threatened because they are sufficiently similar in appearance to Endangered or Threatened species (see § 17.50 et seq.).
(b) The columns entitled “Scientific name” and “Common name” define the species of plant within the meaning of the Act. Although common names are included, they cannot be relied upon for identification of any specimen, since they may vary greatly in local usage. The Services shall use the most recently accepted scientific name. In cases in which confusion might arise, a synonym(s) will be provided in parentheses. The Services shall rely to the extent practicable on the International Code of Botanical Nomenclature.
(c) In the “Status” column the following symbols are used: “E” for Endangered, “T” for Threatened, and “E [or T] (S/A)” for similarity of appearance species.
(d) The other data in the list are nonregulatory in nature and are provided for the information of the reader. In the annual revision and compilation of this title, the following information may be amended without public notice: the spelling of species' names, historical range, footnotes, references to certain other applicable portions of this title, synonyms, and more current names. In any of these revised entries, neither the species, as defined in paragraph (b) of this section, nor its status may be changed without following the procedures of part 424 of this title.
(e) The “Historic range” indicates the known general distribution of the species or subspecies as reported in the current scientific literature. The present distribution may be greatly reduced from this historic range. This column does not imply any limitation on the application of the prohibitions in the Act or implementing rules. Such prohibitions apply to all individuals of the plant species, wherever found.
(f)(1) A footnote to the Federal Register publication(s) listing or reclassifying a species is indicated under the column “When listed.” Footnote numbers to §§ 17.11 and 17.12 are in the same numerical sequence, since plants and animals may be listed in the same Federal Register document. That document, at least since 1973, includes a statement indicating the basis for the listing, as well as the effective date(s) of said listing.
(2) The “Special rules” and “Critical habitat” columns provide a cross reference to other sections in parts 17, 222, 226, or 227. The “Special rules” column will also be used to cite the special rules which describe experimental populations and determine if they are essential or nonessential. Separate listings will be made for experimental populations, and the status column will include the following symbols: “XE” for an essential experimental population and “XN” for a nonessential experimental population. The term “NA” (not applicable) appearing in either of these two columns indicates that there are no special rules and/or critical habitat for that particular species. However, all other appropriate rules in parts 17, 217 through 227, and 402 still apply to that species. In addition, there may be other rules in this title that relate to such plants, e.g., port-of-entry requirements. It is not intended that the references in the “Special rules” column list all the regulations of the two Services which might apply to the species or to the regulations of other Federal agencies or State or local governments.
(g) The listing of a particular taxon includes all lower taxonomic units (see § 17.11(g) for examples).
(h) The “List of Endangered and Threatened Plants” is provided below:
| Species | Historic range | Family | Status | When listed | Critical habitat | Special rules | |
|---|---|---|---|---|---|---|---|
| Scientific name | Common name | ||||||
| Flowering Plants | |||||||
| Abronia macrocarpa | Large-fruited sand-verbena | U.S.A. (TX) | Nyctaginaceae | E | 331 | NA | NA |
| Abutilon eremitopetalum | None | U.S.A. (HI) | Malvaceae | E | 435 | NA | NA |
| Abutilon menziesii | Ko‘oloa‘ula | ......do | ......do | E | 243 | NA | NA |
| Abutilon sandwicense | None | ......do | ......do | E | 448 | 17.99(i) | NA |
| Acaena exigua | Liliwai | ......do | Rosaceae | E | 467 | 17.99(e)(1) | NA |
| Acanthomintha ilicifolia | San Diego thornmint | U.S.A. (CA), Mexico | Lamiaceae | T | 649 | 17.96(a) | NA |
| Acanthomintha obovata ssp. duttonii | San Mateo thornmint | U.S.A. (CA) | ......do | E | 204 | NA | NA |
| Achyranthes mutica | None | U.S.A (HI) | Amaranthaceae | E | 592 | 17.99(k) | NA |
| Achyranthes splendens var. rotundata | Round-leaved chaff flower | ......do | ......do | E | 220 | 17.99(i) | NA |
| Acmispon dendroideus var. traskiae | San Clemente Island lotus | U.S.A. (CA) | Fabaceae | T | 26 | NA | NA |
| Aconitum noveboracense | Northern wild monkshood | U.S.A. (IA, NY, OH, WI) | Ranunculaceae | T | 39 | NA | NA |
| Aeschynomene virginica | Sensitive joint-vetch | U.S.A. (DE, MD, NC, NJ, PA, VA) | Fabaceae | T | 470 | NA | NA |
| Agalinis acuta | Sandplain gerardia | U.S.A. (CT, MA, MD, NY, RI) | Scrophulariaceae | E | 325 | NA | NA |
| Agave eggersiana | No common name | St. Croix, USVI | Agavaceae | E | 848 | 17.96(a) | NA |
| Alectryon macrococcus | Mahoe | U.S.A. (HI) | Sapindaceae | E | 467 | 17.99(a)(1), (c), (e)(1), and (i) | NA |
| Allium munzii | Munz's onion | U.S.A. (CA) | Alliaceae | E | 650 | 17.96 (a) | NA |
| Alopecurus aequalis var. sonomensis | Sonoma alopecurus | ......do | Poaceae | E | 625 | NA | NA |
| Amaranthus brownii | U.S.A. (HI) | Caryophyllaceae | Amaranthaceae | E | 587 | 17.99(g) | NA |
| Amaranthus pumilus | Seabeach amaranth | U.S.A. (DE, MA, MD, NC, NJ, NY, RI, SC, VA) | ......do | T | 498 | NA | NA |
| Ambrosia cheiranthifolia | South Texas ambrosia | U.S.A. (TX) | Asteraceae | E | 547 | NA | NA |
| Ambrosia pumila | San Diego ambrosia | U.S.A. (CA), Mexico | ......do | E | 727 | 17.96 | NA |
| Amorpha crenulata | Crenulate lead-plant | U.S.A. (FL) | Fabaceae | E | 192 | NA | NA |
| Amphianthus pusillus | Little amphianthus | U.S.A. (AL, GA, SC) | Scrophulariaceae | T | 302 | NA | NA |
| Amsinckia grandiflora | Large-flowered fiddleneck | U.S.A. (CA) | Boraginaceae | E | 179 | 17.96(a) | NA |
| Amsonia kearneyana | Kearney's blue-star | U.S.A. (AZ) | Apocynaceae | E | 343 | NA | NA |
| Ancistrocactus tobuschii | Tobusch fishhook cactus | U.S.A. (TX) | Cactaceae | E | 80 | NA | NA |
| Apios priceana | Price's potato-bean | U.S.A. (AL, IL, KY, MS, TN) | Fabaceae | T | 373 | NA | NA |
| Arabis georgiana | Georgia rockcress | U.S.A. (GA, AL) | Brassicaceae | T | 849 | 17.96(a) | NA |
| Arabis hoffmannii | Hoffmann's rock-cress | U.S.A. (CA) | ......do | E | 623 | NA | NA |
| Arabis mcdonaldiana | McDonald's rock-cress | ......do | ......do | E | 44 | NA | NA |
| Arabis perstellata | Braun's Rock-cress | U.S.A. (KY, TN) | ......do | E | 570 | 17.96(a) | NA |
| Arabis serotina | Shale barren rock-cress | U.S.A. (VA, WV) | ......do | E | 352 | NA | NA |
| Arctomecon humilis | Dwarf bear-poppy | U.S.A. (UT) | Papaveraceae | E | 78 | NA | NA |
| Arctostaphylos confertiflora | Santa Rosa Island manzanita | U.S.A. (CA) | Ericaceae | E | 623 | NA | NA |
| Arctostaphylos franciscana | Franciscan manzanita | ......do | ......do | E | 809 | 17.96(a) | NA |
| Arctostaphylos glandulosa ssp. crassifolia | Del Mar manzanita | U.S.A. (CA), Mexico. | ......do | E | 589 | NA | NA |
| Arctostaphylos hookeri var. ravenii | Presidio manzanita | U.S.A. (CA) | ......do | E | 65 | NA | NA |
| Arctostaphylos morroensis | Morro manzanita | ......do | ......do | T | 567 | NA | NA |
| Arctostaphylos myrtifolia | Ione manzanita | ......do | ......do | T | 661 | NA | NA |
| Arctostaphylos pallida | Pallid manzanita | ......do | ......do | T | 635 | NA | NA |
| Arenaria cumberlandensis | Cumberland sandwort | U.S.A. (KY, TN) | Caryophyllaceae | E | 311 | NA | NA |
| Arenaria paludicola | Marsh sandwort | U.S.A. (CA,OR,WA) | ......do | E | 511 | NA | NA |
| Arenaria ursina | Bear Valley sandwort | U.S.A. (CA) | ......do | T | 644 | 17.96(a) | NA |
| Argemone pleiacantha ssp. pinnatisecta | Sacramento prickly-poppy | U.S.A. (NM) | Papaveraceae | E | 360 | NA | NA |
| Argyroxiphium kauense | Mauna Loa silversword | U.S.A. (HI) | Asteraceae | E | 497 | 17.99(k) | NA |
| Argyroxiphium sandwicense ssp. macrocephalum | ‘Ahinahina | ......do | ......do | T | 467 | 17.99(e)(1) | NA |
| Argyroxiphium sandwicense ssp. sandwicense | ‘Ahinahina | ......do | ......do | E | 219 | NA | NA |
| Aristida chaseae | None | U.S.A. (PR) | Poaceae | E | 501 | NA | NA |
| Aristida portoricensis | Pelos del diablo | ......do | ......do | E | 398 | NA | NA |
| Asclepias meadii | Mead's milkweed | U.S.A. (IA, IL, IN, KS, MO, WI) | Asclepiadaceae | T | 321 | NA | NA |
| Asclepias welshii | Welsh's milkweed | U.S.A. (AZ, UT) | ......do | T | 295 | 17.96(a) | NA |
| Asimina tetramera | Four-petal pawpaw | U.S.A. (FL) | Annonaceae | E | 244 | NA | NA |
| Astelia waialealae | Painiu | U.S.A. (HI) | Asteliaceae | E | 765 | 17.99(a) | NA |
| Astragalus albens | Cushenbury milk-vetch | U.S.A. (CA) | Fabaceae | E | 548 | 17.96(a) | NA |
| Astragalus ampullarioides | Shivwits milk-vetch | U.S.A. (UT) | ......do | E | 711 | 17.96(a) | NA |
| Astragalus applegatei | Applegate's milk-vetch | U.S.A. (OR) | ......do | E | 510 | NA | NA |
| Astragalus bibullatus | Guthrie's (=Pyne's) ground-plum | U.S.A. (TN) | ......do | E | 437 | NA | NA |
| Astragalus brauntonii | Braunton's milk-vetch | U.S.A. (CA) | ......do | E | 606 | 17.96(a) | NA |
| Astragalus clarianus | Clara Hunt's milk-vetch | ......do | ......do | E | 625 | NA | NA |
| Astragalus cremnophylax var. cremnophylax | Sentry milk-vetch | U.S.A. (AZ) | ......do | E | 409 | NA | NA |
| Astragalus desereticus | Deseret milk-vetch | U.S.A. (UT) | ......do | T | 668 | NA | NA |
| Astragalus holmgreniorum | Holmgren milk-vetch | U.S.A. (UT, AZ) | ......do | E | 711 | 17.96(a) | NA |
| Astragalus humillimus | Mancos milk-vetch | U.S.A. (CO, NM) | ......do | E | 187 | NA | NA |
| Astragalus jaegerianus | Lane Mountain milk-vetch | U.S.A. (CA) | Fabaceae - Pea | E | 647 | 17.96(a) | NA |
| Astragalus lentiginosus var. coachellae | Coachella Valley milk-vetch | ......do | Fabaceae | E | 647 | 17.96(a) | NA |
| Astragalus lentiginosus var. piscinensis | Fish Slough milk-vetch | ......do | ......do | T | 647 | 17.96(a) | NA |
| Astragalaus magdalenae var. peirsonii | Peirson's milk-vetch | ......do | Fabaceae - Pea | T | 647 | 17.96(a) | NA |
| Astragalus montii | Heliotrope milk-vetch | U.S.A. (UT) | Fabaceae | T | 298 | 17.96(a) | NA |
| Astragalus osterhoutii | Osterhout milk-vetch | U.S.A. (CO) | ......do | E | 353 | NA | NA |
| Astragalus phoenix | Ash Meadows milk-vetch | U.S.A. (NV) | ......do | T | 181 | 17.96(a) | NA |
| Astragalus pycnostachyus var. lanosissimus | Ventura Marsh milk-vetch | U.S.A. (CA) | Fabaceae - Pea Family | E | 708 | 17.96(a) | NA |
| Astragalus robbinsii var. jesupi | Jesup's milk-vetch | U.S.A. (NH, VT) | Fabaceae | E | 271 | NA | NA |
| Astragalus tener var. titi | Coastal dunes milk-vetch | U.S.A. (CA) | ......do | E | 640 | NA | NA |
| Astragalus tricarinatus | Triple-ribbed milk-vetch | ......do | ......do | E | 647 | NA | NA |
| Astrophytum asterias | Star cactus | U.S.A. (TX), Mexico | Cactaceae | E | 521 | NA | NA |
| Atriplex coronata var. notatior | San Jacinto Valley crownscale | U.S.A. (CA) | Chenopodiaceae - Goosefoot Family | E | 650 | 17.96 (a) (No areas designated) | NA |
| Auerodendron pauciflorum | None | U.S.A. (PR) | Rhamnaceae | E | 531 | NA | NA |
| Ayenia limitaris | Texas ayenia | U.S.A. (TX), Mexico | Sterculiaceae | E | 547 | NA | NA |
| Baccharis vanessae | Encinitas baccharis | U.S.A. (CA) | Asteraceae | T | 589 | NA | NA |
| Banara vanderbiltii | Palo de Ramón | U.S.A. (PR) | Flacourtiaceae | E | 255 | NA | NA |
| Baptisia arachnifera | Hairy rattleweed | U.S.A. (GA) | Fabaceae | E | 39 | NA | NA |
| Berberis nevinii | Nevin's barberry | U.S.A. (CA) | Berberidaceae | E | 648 | 17.96(a) | NA |
| Berberis pinnata ssp. insularis | Island barberry | ......do | ......do | E | 623 | NA | NA |
| Betula uber | Virginia round-leaf birch | U.S.A. (VA) | Betulaceae | T | 39, 560 | NA | NA |
| Bidens amplectens | Kookoolau | U.S.A. (HI) | Asteraceae | E | 806 | 17.99(i) | NA |
| Bidens campylotheca ssp. pentamera | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Bidens campylotheca ssp. waihoiensis | ......do | ......do | ......do | E | 815 | 17.95(e)(1) | NA |
| Bidens conjuncta | ......do | ......do | ......do | E | 815 | 17.99(e)(1)NA | NA |
| Bidens hillebrandiana ssp. hillebrandiana | ......do | ......do | ......do | E | 818 | NA | NA |
| Bidens micrantha ssp. ctenophylla | ......do | ......do | ......do | E | 818 | NA | NA |
| Bidens micrantha ssp. kalealaha | ......do | ......do | ......do | E | 467 | 17.99(e)(1) | NA |
| Bidens wiebkei | ......do | ......do | ......do | E | 480 | 17.99(c) | NA |
| Blennosperma bakeri | Sonoma sunshine | U.S.A. (CA) | ......do | E | 453 | NA | NA |
| Boltonia decurrens | Decurrent false aster | U.S.A. (IL, MO) | ......do | T | 341 | NA | NA |
| Bonamia grandiflora | Florida bonamia | U.S.A. (FL) | Convolvulaceae | T | 297 | NA | NA |
| Bonamia menziesii | None | U.S.A. (HI) | ......do | E | 559 | 17.99(a)(1), (c), (e)(1), (i), and (k) | NA |
| Brickellia mosieri | Florida brickell-bush | U.S.A. (FL) | Asteraceae | E | 844 | 17.96(a) | NA |
| Brighamia insignis | Olulu | U.S.A. (HI) | Campanulaceae | E | 530 | 17.99(a)(1) and (a)(2) | NA |
| Brighamia rockii | Pua ala | ......do | ......do | E | 480 | 17.99(c) and (e)(1) | NA |
| Brodiaea filifolia | Thread-leaved brodiaea | U.S.A. (CA) | Themidaceae | T | 650 | 17.96(a) | NA |
| Brodiaea pallida | Chinese Camp brodiaea | ......do | Liliaceae | T | 643 | NA | NA |
| Bulbophyllum guamense | Siboyas halumtanu, Siboyan halom tano | U.S. Territory of Guam, U.S. CNMI | Orchidaceae | T | 858 | NA | NA |
| Buxus vahlii | Vahl's boxwood | U.S.A. (PR, VI) | Buxaceae | E | 197 | NA | NA |
| Calamagrostis hillebrandii | None | U.S.A. (HI) | Poaceae | E | 815 | 17.99(e)(1) | NA |
| Callicarpa ampla | Capá rosa | U.S.A. (PR) | Verbenaceae | E | 461 | NA | NA |
| Callirhoe scabriuscula | Texas poppy-mallow | U.S.A. (TX) | Malvaceae | E | 109, 112 | NA | NA |
| Calochortus tiburonensis | Tiburon mariposa lily | U.S.A. (CA) | Liliaceae | T | 575 | NA | NA |
| Calyptranthes thomasiana | None | U.S.A. (PR, VI) British VI | Myrtaceae | E | 529 | NA | NA |
| Calyptridium pulchellum | Mariposa pussypaws | U.S.A. (CA) | Portulacaceae | T | 643 | NA | NA |
| Calyptronoma rivalis | Palma de manaca | U.S.A. (PR) | Arecaceae | T | 375 | NA | NA |
| Calystegia stebbinsii | Stebbins' morning-glory | U.S.A. (CA) | Convolvulaceae | E | 596 | NA | NA |
| Camissonia benitensis | San Benito evening-primrose | ......do | Onagraceae | T | 172 | NA | NA |
| Campanula robinsiae | Brooksville bellflower | U.S.A. (FL) | Campanulaceae | E | 356 | NA | NA |
| Canavalia molokaiensis | Awikiwiki | U.S.A. (HI) | Fabaceae | E | 480 | 17.99(c) | NA |
| Canavalia napaliensis | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Canavalia pubescens | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cardamine micranthera | Small-anthered bittercress | U.S.A. (NC, VA) | Brassicaceae | E | 363 | NA | NA |
| Carex albida | White sedge | U.S.A. (CA) | Cyperaceae | E | 625 | NA | NA |
| Carex lutea | Golden sedge | U.S.A. (NC) | ......do | E | 721 | 17.96(a) | NA |
| Carex specuicola | Navajo sedge | U.S.A. (AZ, UT) | ......do | T | 178 | 17.96(a) | NA |
| Castilleja affinis ssp. neglecta | Tiburon paintbrush | U.S.A. (CA) | Scrophulariaceae | E | 575 | NA | NA |
| Castilleja campestris ssp. succulenta | Fleshy owl's-clover | ......do | ......do | T | 611 | 17.96(a) | NA |
| Castilleja cinerea | Ash-gray Indian paintbrush | ......do | Orobanchaceae | T | 644 | 17.96(a) | NA |
| Castilleja grisea | San Clemente Island Paintbrush | ......do | ......do | T | 26 | NA | NA |
| Castilleja levisecta | Golden paintbrush | U.S.A. (OR, WA), Canada (B.C.) | ......do | T | 615 | NA | NA |
| Castilleja mollis | Soft-leaved paintbrush | U.S.A. (CA) | ......do | E | 623 | NA | NA |
| Catesbaea melanocarpa | None | U.S.A. (PR, VI), Antigua, Barbuda, Guadalupe | Rubiaceae | E | 657 | 17.96(a) | NA |
| Caulanthus californicus | California jewelflower | U.S.A. (CA) | Brassicaceae | E | 395 | NA | NA |
| Ceanothus ferrisae | Coyote ceanothus | ......do | Rhamnaceae | E | 575 | NA | NA |
| Ceanothus ophiochilus | Vail Lake ceanothus | ......do | ......do | T | 648 | 17.96(a) | NA |
| Ceanothus roderickii | Pine Hill ceanothus | ......do | ......do | E | 596 | NA | NA |
| Cenchrus agrimonioides | Kamanomano | U.S.A. (HI) | Poaceae | E | 592 | 17.99(e)(1) and (i) | NA |
| Centaurium namophilum | Spring-loving centaury | U.S.A. (CA, NV) | Gentianaceae | T | 181 | 17.96(a) | NA |
| Cercocarpus traskiae | Catalina Island mountain-mahogany | U.S.A. (CA) | Rosaceae | E | 624 | NA | NA |
| Cereus eriophorus var. fragrans | Fragrant prickly-apple | U.S.A. (FL) | Cactaceae | E | 208 | NA | NA |
| Chamaecrista glandulosa var. mirabilis | None | U.S.A. (PR) | Fabaceae | E | 379 | NA | NA |
| Chamaesyce deltoidea ssp. deltoidea | Deltoid spurge | U.S.A. (FL) | Euphorbiaceae | E | 192 | NA | NA |
| Chamaesyce garberi | Garber's spurge | U.S.A. (FL) | ......do | T | 192 | NA | NA |
| Chamaesyce hooveri | Hoover's spurge | U.S.A. (CA) | ......do | T | 611 | 17.96(a) | NA |
| Charpentiera densiflora | Papala | U.S.A. (HI) | Amaranathaceae | E | 765 | 17.99(a) | NA |
| Chionanthus pygmaeus | Pygmy fringe-tree | U.S.A. (FL) | Oleaceae | E | 256 | NA | NA |
| Chlorogalum purpureum | Purple amole (Camatta Canyon amole) | U.S.A. (CA) | Liliaceae - Lily | T | 689 | 17.96(a) | NA |
| Chorizanthe howellii | Howell's spineflower | ......do | Polygonaceae | E | 472 | NA | NA |
| Chorizanthe orcuttiana | Orcutt's spineflower | ......do | ......do | E | 589 | NA | NA |
| Chorizanthe pungens var. hartwegiana | Ben Lomond spineflower | ......do | ......do | E | 528 | NA | NA |
| Chorizanthe pungens var. pungens | Monterey Spineflower | ......do | Polygonaceae - Buckwheat | T | 528 | 17.96(a) | NA |
| Chorizanthe robusta var. hartwegii | Scotts Valley spineflower | ......do | ......do | E | 528 | 17.96(a) | NA |
| Chorizanthe robusta var. robusta | Robust Spineflower | ......do | ......do | E | 528 | 17.96(b) | NA |
| Chorizanthe valida | Sonoma spineflower | ......do | Polygonaceae | E | 472 | NA | NA |
| Chromolaena frustrata | Cape Sable thoroughwort | U.S.A. (FL) | Asteraceae | E | 826 | 17.96(a) | NA |
| Do | U.S.A. (FL) | NA | E | 17.96(h) | NA | ||
| Chrysopsis floridana | Florida golden aster | U.S.A. (FL) | Asteraceae | E | 232 | NA | NA |
| Cirsium fontinale var. fontinale | Fountain thistle | U.S.A. (CA) | ......do | E | 575 | NA | NA |
| Cirsium fontinale var. obispoense | Chorro Creek bog thistle | ......do | ......do | E | 567 | NA | NA |
| Cirsium hydrophilum var. hydrophilum | Suisun thistle | ......do | ......do | E | 627 | 17.96 (a) | NA |
| Cirsium loncholepis | La Graciosa thistle | ......do | Asteraceae - Sunflower | E | 691 | 17.96(a) | NA |
| Cirsium pitcheri | Pitcher's thistle | U.S.A. (IL, IN, MI, WI), Canada (Ont.) | Asteraceae | T | 315 | NA | NA |
| Cirsium vinaceum | Sacramento Mountains thistle | U.S.A. (NM) | ......do | T | 276 | NA | NA |
| Clarkia franciscana | Presidio clarkia | U.S.A. (CA) | Onagraceae | E | 575 | NA | NA |
| Clarkia imbricata | Vine Hill clarkia | ......do | ......do | E | 625 | NA | NA |
| Clarkia speciosa ssp. immaculata | Pismo clarkia | ......do | ......do | E | 567 | NA | NA |
| Clarkia springvillensis | Springville clarkia | ......do | ......do | T | 643 | NA | NA |
| Clematis morefieldii | Morefield's leather-flower | U.S.A. (AL) | Ranunculaceae | E | 468 | NA | NA |
| Clematis socialis | Alabama leather-flower | ......do | ......do | E | 245 | NA | NA |
| Clermontia drepanomorpha | Oha wai | U.S.A. (HI) | Campanulaceae | E | 595 | 17.99(k) | NA |
| Clermontia lindseyana | ......do | ......do | ......do | E | 532 | 17.99(e)(1) and (k) | NA |
| Clermontia oblongifolia ssp. brevipes | Oha wai | ......do | ......do | E | 480 | 17.99(c) | NA |
| Clermontia oblongifolia ssp. mauiensis | ......do | ......do | ......do | E | 467 | 17.99(e)(1) | NA |
| Clermontia peleana | ......do | ......do | ......do | E | 532 | 17.99(e)(1) and (k) | NA |
| Clermontia pyrularia | ......do | ......do | ......do | E | 532 | 17.99(k) | NA |
| Clermontia samuelii | ......do | ......do | ......do | E | 666 | 17.99(e)(1) | NA |
| Clitoria fragrans | Pigeon wings | U.S.A. (FL) | Fabaceae | T | 500 | NA | NA |
| Colubrina oppositifolia | Kauila | U.S.A. (HI) | Rhamnaceae | E | 532 | 17.99(e)(1), (i), and (k) | NA |
| Conradina brevifolia | Short-leaved rosemary | U.S.A. (FL) | Lamiaceae | E | 507 | NA | NA |
| Conradina etonia | Etonia rosemary | ......do | ......do | E | 507 | NA | NA |
| Conradina glabra | Apalachicola rosemary | ......do | ......do | E | 507 | NA | NA |
| Conradina verticillata | Cumberland rosemary | U.S.A. (KY, TN) | ......do | T | 452 | NA | NA |
| Consolea corallicola | Cactus, Florida semaphore | U.S.A. (FL) | Cactaceae | E | 826 | 17.96(a) | NA |
| Cordia bellonis | None | U.S.A. (PR) | Boraginaceae | E | 601 | NA | NA |
| Cordylanthus maritimus ssp. maritimus | Salt marsh bird's-beak | U.S.A. (CA), Mexico (Baja California) | Scrophulariaceae | E | 44 | NA | NA |
| Cordylanthus mollis ssp. mollis | Soft bird's-beak | U.S.A. (CA) | ......do | E | 627 | 17.96 (a) | NA |
| Cordylanthus palmatus | Palmate-bracted bird's-beak | ......do | ......do | E | 235 | NA | NA |
| Cordylanthus tenuis ssp. capillaris | Pennell's bird's-beak | ......do | ......do | E | 575 | NA | NA |
| Cornutia obovata | Palo de nigua | U.S.A. (PR) | Verbenaceae | E | 307 | NA | NA |
| Coryphantha minima | Nellie cory cactus | U.S.A. (TX) | Cactaceae | E | 81 | NA | NA |
| Coryphantha ramillosa | Bunched cory cactus | U.S.A. (TX), Mexico (Coahuila) | ......do | T | 77 | NA | NA |
| Coryphantha robbinsorum | Cochise pincushion cactus | U.S.A. (AZ), Mexico (Sonora) | ......do | T | 214 | NA | NA |
| Coryphantha scheeri var. robustispina | Pima pineapple cactus | ......do | ......do | E | 515 | NA | NA |
| Coryphantha sneedii var. leei | Lee pincushion cactus | U.S.A. (NM) | ......do | T | 61 | NA | NA |
| Coryphantha sneedii var. sneedii | Sneed pincushion cactus | U.S.A. (NM, TX) | ......do | E | 82 | NA | NA |
| Cranichis ricartii | None | U.S.A. (PR) | Orchidaceae | E | 451 | NA | NA |
| Crescentia portoricensis | Higuero de Sierra | ......do | Bignoniaceae | E | 301 | NA | NA |
| Crotalaria avonensis | Avon Park harebells | U.S.A. (FL) | Fabaceae | E | 500 | NA | NA |
| Cryptantha crassipes | Terlingua Creek cats-eye | U.S.A. (TX) | Boraginaceae | E | 439 | NA | NA |
| Cucurbita okeechobeensis ssp. okeechobeensis | Okeechobee gourd | U.S.A. (FL) | Cucurbitaceae | E | 507 | NA | NA |
| Cyanea acuminata | HaHa | U.S.A. (HI) | Campanulaceae | E | 591 | 17.99(i) | NA |
| Cyanea asarifolia | ......do | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Cyanea asplenifolia | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyanea calycina | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Cyanea copelandii ssp. copelandii | ......do | ......do | ......do | E | 532 | NA | NA |
| Cyanea copelandii ssp. haleakalaensis | ......do | ......do | ......do | E | 666 | 17.99(e)(1) | NA |
| Cyanea crispa | ......do | ......do | ......do | E | 536 | 17.99(i) | NA |
| Cyanea dolichopoda | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Cyanea dunbariae | ......do | ......do | ......do | E | 594 | 17.99(c) | NA |
| Cyanea duvalliorum | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyanea eleeleensis | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Cyanea gibsonii | ......do | ......do | ......do | E | 435 | NA | NA |
| Cyanea glabra | ......do | ......do | ......do | E | 666 | 17.99(e)(1) | NA |
| Cyanea grimesiana ssp. grimesiana | ......do | ......do | ......do | E | 592, 815 | 17.99(c) and (i) | NA |
| Cyanea grimesiana ssp. obatae | ......do | ......do | ......do | E | 541 | 17.99(i) | NA |
| Cyanea hamatiflora ssp. carlsonii | ......do | ......do | ......do | E | 532 | 17.99(k) | NA |
| Cyanea hamatiflora ssp. hamatiflora | ......do | ......do | ......do | E | 666 | 17.99(e)(1) | NA |
| Cyanea horrida | Haha nui | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyanea humboltiana | Haha | ......do | ......do | E | 591 | 17.99(i) | NA |
| Cyanea kolekoleensis | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Cyanea koolauensis | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Cyanea kuhihewa | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Cyanea kunthiana | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyanea lanceolata | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Cyanea lobata | ......do | ......do | ......do | E | 467 | 17.99(e)(1) | NA |
| Cyanea longiflora | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Cyanea magnicalyx | Haha | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyanea mannii | ......do | ......do | ......do | E | 480 | 17.99(c) | NA |
| Cyanea maritae | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyanea marksii | ......do | ......do | ......do | E | 818 | NA | NA |
| Cyanea mauiensis | ......do | ......do | ......do | E | 815 | NA | NA |
| Cyanea mceldowneyi | ......do | ......do | ......do | E | 467 | 17.99(e)(1) | NA |
| Cyanea munroi | ......do | ......do | ......do | E | 815 | 17.99(c) | NA |
| Cyanea obtusa | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyanea pinnatifida | ......do | ......do | ......do | E | 448 | 17.99(i) | NA |
| Cyanea platyphylla | `Aku`aku | ......do | ......do | E | 595 | 17.99(k) | NA |
| Cyanea procera | Haha | ......do | ......do | E | 480 | 17.99(c) | NA |
| Cyanea profuga | ......do | ......do | ......do | E | 815 | 17.99(c) | NA |
| Cyanea purpurellifolia | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Cyanea recta | ......do | ......do | ......do | T | 590 | 17.99(a)(1) | NA |
| Cyanea remyi | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Cyanea rivularis | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Cyanea shipmanii | ......do | ......do | ......do | E | 532 | 17.99(k) | NA |
| Cyanea solanacea | Popolo | ......do | ......do | E | 815 | 17.99(c) | NA |
| Cyanea st.-johnii | Haha | ......do | ......do | E | 591 | 17.99(i) | NA |
| Cyanea stictophylla | ......do | ......do | ......do | E | 532 | 17.99(k) | NA |
| Cyanea superba | None | ......do | ......do | E | 434 | 17.99(i) | NA |
| Cyanea tritomantha | Aku | ......do | ......do | E | 818 | NA | NA |
| Cyanea truncata | Haha | ......do | ......do | E | 536 | 17.99(i) | NA |
| Cyanea undulata | None | ......do | ......do | E | 436 | 17.99(a)(1) | NA |
| Cycladenia humilis var. jonesii | Jones cycladenia | U.S.A. (AZ, UT) | Apocynaceae | T | 229 | NA | NA |
| Cycas micronesica | Fadang, Faadang | U.S. Territory of Guam, U.S. CNMI, Federated States of Micronesia, Independent Republic of Palau | Cycadaceae | T | 858 | NA | NA |
| Cyperus fauriei | None | U.S.A. (HI) | Cyperaceae | E | 532 | 17.99(c) and (k) | NA |
| Cyperus pennatiformis | None | ......do | ......do | E | 559 | 17.99(a)(1), (e)(1), (g), and (i) | NA |
| Cyperus trachysanthos | Puukaa | ......do | ......do | E | 592 | 17.99(a)(1), (c), and (i) | NA |
| Cyrtandra crenata | Ha‘iwale | ......do | Gesneriaceae | E | 536 | NA | NA |
| Cyrtandra cyaneoides | Mapele | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Cyrtandra dentata | Haiwale | ......do | ......do | E | 591 | 17.99(i) | NA |
| Cyrtandra ferripilosa | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyrtandra filipes | ......do | ......do | ......do | E | 815 | 17.99(c) and (e)(1) | NA |
| Cyrtandra giffardii | ......do | ......do | ......do | E | 532 | 17.99(k) | NA |
| Cyrtandra gracilis | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Cyrtandra kaulantha | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Cyrtandra limahuliensis | ......do | ......do | ......do | T | 530 | 17.99(a)(1) | NA |
| Cyrtandra munroi | ......do | ......do | ......do | E | 467 | 17.99(e)(1) | NA |
| Cyrtandra nanawaleensis | ......do | ......do | ......do | E | 818 | NA | NA |
| Cyrtandra oenobarba | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Cyrtandra oxybapha | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Cyrtandra paliku | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Cyrtandra polyantha | ......do | ......do | ......do | E | 536 | 17.99(i) | NA |
| Cyrtandra sessilis | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Cyrtandra subumbellata | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Cyrtandra tintinnabula | ......do | ......do | ......do | E | 532 | 17.99(k) | NA |
| Cyrtandra viridiflora | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Cyrtandra wagneri | ......do | ......do | ......do | E | 818 | NA | NA |
| Cyrtandra waiolani | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Dalea foliosa | Leafy prairie-clover | U.S.A. (AL, IL, TN) | Fabaceae | E | 422 | NA | NA |
| Daphnopsis hellerana | None | U.S.A. (PR) | Thymelaeaceae | E | 309 | NA | NA |
| Deeringothamnus pulchellus | Beautiful pawpaw | U.S.A. (FL) | Annonaceae | E | 244 | NA | NA |
| Deeringothamnus rugelii | Rugel's pawpaw | ......do | ......do | E | 244 | NA | NA |
| Deinandra (=Hemizonia) conjugens | Otay tarplant | U.S.A. (CA), Mexico | Asteraceae - Sunflower | T | 649 | 17.96(a) | NA |
| Deinandra increscens ssp. villosa | Gaviota tarplant | U.S.A. (CA) | ......do | E | 691 | 17.96(a) | NA |
| Delissea rhytidosperma | None | U.S.A. (HI) | Campanulaceae | E | 530 | 17.99(a)(1) | NA |
| Delissea subcordata | Oha | ......do | ......do | E | 591 | 17.99(i) | NA |
| Delissea undulata | None | ......do | ......do | E | 593 | 17.99(a)(1) and (k) | NA |
| Delphinium bakeri | Baker's larkspur | U.S.A. (CA) | Ranunculaceae | E | 681 | 17.96(a) | NA |
| Delphinium luteum | Yellow larkspur | ......do | ......do | E | 681 | 17.96(a) | NA |
| Delphinium variegatum ssp. kinkiense | San Clemente Island larkspur | ......do | ......do | E | 26 | NA | NA |
| Dendrobium guamense | None | U.S. Territory of Guam, U.S. CNMI | Orchidaceae | T | 858 | NA | NA |
| Dicerandra christmanii | Garrett's mint | U.S.A. (FL) | Lamiaceae | E | 207, 362 | NA | NA |
| Dicerandra cornutissima | Longspurred mint | ......do | ......do | E | 207 | NA | NA |
| Dicerandra frutescens | Scrub mint | ......do | ......do | E | 207, 362 | NA | NA |
| Dicerandra immaculata | Lakela's mint | ......do | ......do | E | 180 | NA | NA |
| Diplacus vandenbergensis | Vandenberg monkeyflower | U.S.A. (CA) | Phrymaceae | E | 847 | NA | NA |
| Diplacus vandenbergensis | Vandenberg monkeyflower | U.S.A. (CA) | Phrymaceae | E | 847 | 17.96(a) | NA |
| Dodecahema leptoceras | Slender-horned spineflower | U.S.A. (CA) | Polygonaceae | E | 291 | NA | NA |
| Dubautia herbstobatae | Naenae | U.S.A. (HI) | Asteraceae | E | 448 | 17.99(i) | NA |
| Dubautia imbricata ssp. imbricata | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Dubautia kalalauensis | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Dubautia kenwoodii | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Dubautia latifolia | Koholapehu | ......do | ......do | E | 464 | 17.99(a)(1) | NA |
| Dubautia pauciflorula | Naenae | ......do | ......do | E | 436 | 17.99(a)(1) | NA |
| Dubautia plantaginea ssp. humilis | ......do | ......do | ......do | E | 666 | 17.99(e)(1) | NA |
| Dubautia plantaginea ssp. magnifolia | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Dubautia waialealae | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Dudleya abramsii ssp. parva | Conejo dudleya | U.S.A. (CA) | Crassulaceae | T | 606 | NA | NA |
| Dudleya cymosa ssp. marcescens | Marcescent dudleya | ......do | ......do | T | 606 | NA | NA |
| Dudleya cymosa ssp. ovatifolia | Santa Monica Mountains dudleya | ......do | ......do | T | 606 | NA | NA |
| Dudleya nesiotica | Santa Cruz Island dudleya | ......do | ......do | T | 623 | NA | NA |
| Dudleya setchellii | Santa Clara Valley dudleya | ......do | ......do | E | 575 | NA | NA |
| Dudleya stolonifera | Laguna Beach liveforever | ......do | ......do | T | 649 | NA | NA |
| Dudleya traskiae | Santa Barbara Island liveforever | ......do | ......do | E | 39 | NA | NA |
| Dudleya verityi | Verity's dudleya | ......do | ......do | T | 606 | NA | NA |
| Echinacea laevigata | Smooth coneflower | U.S.A. (GA, MD, NC, PA, SC, VA) | Asteraceae | E | 481 | NA | NA |
| Echinocactus horizonthalonius var. nicholii | Nichol's Turk's head cactus | U.S.A. (AZ) | Cactaceae | E | 71 | NA | NA |
| Echinocereus chisoensis var. chisoensis | Chisos Mountain hedgehog cactus | U.S.A. (TX) | ......do | T | 335 | NA | NA |
| Echinocereus fendleri var. kuenzleri | Kuenzler hedgehog cactus | U.S.A. (NM) | ......do | E | 70 | NA | NA |
| Echinocereus reichenbachii var. albertii | Black lace cactus | U.S.A. (TX) | ......do | E | 68 | NA | NA |
| Echinocereus triglochidiatus var. arizonicus | Arizona hedgehog cactus | U.S.A. (AZ) | ......do | E | 62 | NA | NA |
| Echinocereus viridiflorus var. davisii | Davis' green pitaya | U.S.A. (TX) | ......do | E | 81 | NA | NA |
| Echinomastus erectocentrus var. acunensis | acuña cactus | U.S.A. (AZ), Mexico | ......do | E | 821 | NA | NA |
| Echinomastus mariposensis | Lloyd's Mariposa cactus | U.S.A. (TX), Mexico (Coahuila) | ......do | T | 77 | NA | NA |
| Enceliopsis nudicaulis var. corrugata | Ash Meadows sunray | U.S.A. (NV) | Asteraceae | T | 181 | 17.96(a) | NA |
| Eragrostis fosbergii | Fosberg's love grass | U.S.A. (HI) | Poaceae | E | 591 | 17.99(i) | NA |
| Eremalche kernensis | Kern mallow | U.S.A. (CA) | Malvaceae | E | 395 | NA | NA |
| Eriastrum densifolium ssp. sanctorum | Santa Ana River woolly-star | ......do | Polemoniaceae | E | 291 | NA | NA |
| Erigeron decumbens | Willamette daisy | U.S.A. (OR) | Asteraceae | E | 679 | 17.96(a) | NA |
| Erigeron parishii | Parish's daisy | U.S.A. (CA) | ......do | T | 548 | 17.96(a) | NA |
| Erigeron rhizomatus | Zuni fleabane | U.S.A. (NM) | ......do | T | 177 | NA | NA |
| Eriodictyon altissimum | Indian Knob mountain balm | U.S.A. (CA) | Hydrophyllaceae | E | 567 | NA | NA |
| Eriodictyon capitatum | Lompoc yerba santa | ......do | Hydrophyllaceae - Waterleaf | E | 691 | 17.96(a) | NA |
| Eriogonum apricum (incl. var. prostratum) | Ione (incl. Irish Hill) buckwheat | ......do | Polygonaceae | E | 661 | NA | NA |
| Eriogonum codium | Umtanum desert buckwheat | U.S.A. (WA) | ......do | T | 811 | 17.96(a) | NA |
| Eriogonum gypsophilum | Gypsum wild-buckwheat | U.S.A. (NM) | ......do | T | 110, 112 | 17.96(a) | NA |
| Eriogonum kennedyi var. austromontanum | Southern mountain wild-buckwheat | U.S.A. (CA) | ......do | T | 644 | 17.96(a) | NA |
| Eriogonum longifolium var. gnaphalifolium | Scrub buckwheat | U.S.A. (FL) | ......do | T | 500 | NA | NA |
| Eriogonum ovalifolium var. vineum | Cushenbury buckwheat | U.S.A. (CA) | ......do | E | 548 | 17.96(a) | NA |
| Eriogonum ovalifolium var. williamsiae | Steamboat buckwheat | U.S.A. (NV) | ......do | E | 237 | NA | NA |
| Eriogonum pelinophilum | Clay-loving wild-buckwheat | U.S.A. (CO) | ......do | E | 151 | 17.96(a) | NA |
| Eriophyllum latilobum | San Mateo woolly sunflower | U.S.A. (CA) | Asteraceae | E | 575 | NA | NA |
| Eryngium aristulatum var. parishii | San Diego button-celery | ......do | Apiaceae | E | 512 | NA | NA |
| Eryngium constancei | Loch Lomond coyote-thistle | ......do | ......do | E | 194E, 249 | NA | NA |
| Eryngium cuneifolium | Snakeroot | U.S.A. (FL) | ......do | E | 256 | NA | NA |
| Erysimum capitatum var. angustatum | Contra Costa wallflower | U.S.A. (CA) | Brassicaceae | E | 39 | 17.96(a) | NA |
| Erysimum menziesii | Menzies' wallflower | ......do | ......do | E | 472 | NA | NA |
| Erysimum teretifolium | Ben Lomond wallflower | ......do | ......do | E | 528 | NA | NA |
| Erythronium propullans | Minnesota dwarf trout lily | U.S.A. (MN) | Liliaceae | E | 221 | NA | NA |
| Eugenia bryanii | None | U.S. Territory of Guam | Myrtaceae | E | 858 | NA | NA |
| Eugenia haematocarpa | Uvillo | U.S.A. (PR) | Myrtaceae | E | 564 | NA | NA |
| Eugenia koolauensis | Nioi | U.S.A. (HI) | ......do | E | 536 | 17.99(c) and (i) | NA |
| Eugenia woodburyana | None | U.S.A. (PR) | ......do | E | 551 | NA | NA |
| Euphorbia celastroides var. kaenana | `Akoko | U.S.A. (HI) | Euphorbiaceae | E | 448 | 17.99(i) | NA |
| Euphorbia deppeana | ......do | ......do | ......do | E | 536 | 17.99(i) | NA |
| Euphorbia eleanoriae | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Euphorbia haeleeleana | ......do | ......do | ......do | E | 592 | 17.99(a)(1) and (i) | NA |
| Euphorbia halemanui | ......do | ......do | ......do | E | 464 | 17.99(a)(1) | NA |
| Euphorbia herbstii | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Euphorbia kuwaleana | ......do | ......do | ......do | E | 448 | 17.99(i) | NA |
| Euphorbia remyi var. kauaiensis | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Euphorbia remyi var. remyi | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Euphorbia rockii | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Euphorbia skottsbergii var. skottsbergii | `Ewa Plains `akoko | ......do | ......do | E | 120 | 17.99(i) | NA |
| Euphorbia telephioides | Telephus spurge | U.S.A. (FL) | ......do | T | 463 | NA | NA |
| Eutrema penlandii | Penland alpine fen mustard | U.S.A. (CO) | Brassicaceae | T | 509 | NA | NA |
| Exocarpos luteolus | Heau | U.S.A. (HI) | Santalaceae | E | 530 | 17.99(a)(1) | NA |
| Festuca molokaiensis | None | ......do | Poaceae | E | 815 | 17.99(c) | NA |
| Flueggea neowawraea | Mehamehame | ......do | Phyllanthaceae | E | 559 | 17.99(a)(1), (c), (e)(1), (i) and (k) | NA |
| Fremontodendron californicum ssp. decumbens | Pine Hill flannelbush | U.S.A. (CA) | Sterculiaceae | E | 596 | NA | NA |
| Fremontodendron mexicanum | Mexican flannelbush | U.S.A. (CA), Mexico | ......do | E | 648 | 17.96(a) | NA |
| Fritillaria gentneri | Gentner's fritillary | U.S.A. (OR) | Liliaceae | E | 672 | NA | NA |
| Galactia smallii | Small's milkpea | U.S.A. (FL) | Fabaceae | E | 192 | NA | NA |
| Galium buxifolium | Island bedstraw | U.S.A. (CA) | Rubiaceae | E | 623 | NA | NA |
| Galium californicum ssp. sierrae | El Dorado bedstraw | ......do | ......do | E | 596 | NA | NA |
| Gardenia brighamii | Hawaiian gardenia (Na‘u) | U.S.A. (HI) | ......do | E | 198 | NA | NA |
| Gardenia mannii | Nanu | ......do | ......do | E | 591 | 17.99(i) | NA |
| Gaura neomexicana ssp. coloradensis | Colorado butterfly plant | U.S.A. (WY, NE, CO) | Onagraceae-Evening Primrose | T | 704 | 17.96(a) | NA |
| Geocarpon minimum | None | U.S.A. (AR, LA, MO) | Caryophyllaceae | T | 275 | NA | NA |
| Geranium arboreum | Nohoanu | U.S.A. (HI) | Geraniaceae | E | 465 | 17.99(e)(1) | NA |
| Geranium hanaense | Nohoanu | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Geranium hillebrandii | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Geranium kauaiense | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Geranium multiflorum | ......do | ......do | ......do | E | 467 | 17.99(e)(1) | NA |
| Gesneria pauciflora | None | U.S.A. (PR) | Gesneriaceae | T | 578 | NA | NA |
| Geum radiatum | Spreading avens | U.S.A. (NC, TN) | Rosaceae | E | 381 | NA | NA |
| Gilia tenuiflora ssp. arenaria | Monterey gilia | U.S.A. (CA) | Polemoniaceae | E | 472 | NA | NA |
| Gilia tenuiflora ssp. hoffmannii | Hoffmann's slender-flowered gilia | ......do | ......do | E | 623 | NA | NA |
| Goetzea elegans | Beautiful goetzea or matabuey | U.S.A. (PR) | Solanaceae | E | 176 | NA | NA |
| Gonocalyx concolor | No common name | Puerto Rico | Ericaceae | E | 848 | 17.96(a) | NA |
| Gouania hillebrandii | None | U.S.A. (HI) | Rhamnaceae | E | 165 | 17.99(c), (e)(1), and (e)(2) | NA |
| Gouania meyenii | ......do | ......do | ......do | E | 448 | 17.99(a)(1) and (i) | NA |
| Gouania vitifolia | ......do | ......do | ......do | E | 541 | 17.99(e)(1), and (k) | NA |
| Grindelia fraxino-pratensis | Ash Meadows gumplant | U.S.A. (CA, NV) | Asteraceae | T | 181 | 17.96(a) | NA |
| Hackelia venusta | Showy stickseed | U.S.A. (WA) | Boraginaceae - Borage | E | 722 | NA | NA |
| Halophila johnsonii | Johnson's seagrass | U.S.A. (FL) | Hydrocharitaceae | T | 663 | 226.213 | NA |
| Haplostachys haplostachya | None | U.S.A. (HI) | Lamiaceae | E | 73 | NA | NA |
| Harperocallis flava | Harper's beauty | U.S.A. (FL) | Liliaceae | E | 57 | NA | NA |
| Harrisia aboriginum | Prickly-apple, aboriginal | ......do | Cactaceae | E | 826 | 17.96(a) | NA |
| Harrisia portoricensis | Higo chumbo | U.S.A. (PR) | ......do | T | 397 | NA | NA |
| Hedeoma todsenii | Todsen's pennyroyal | U.S.A. (NM) | Lamiaceae | E | 110, 112 | 17.96(a) | NA |
| Hedyotis megalantha | Pau dedu, Pao doodu | U.S. Territory of Guam | Rubiaceae | E | 858 | NA | NA |
| Hedyotis purpurea var. montana | Roan Mountain bluet | U.S.A. (NC, TN) | ......do | E | 381 | NA | NA |
| Helenium virginicum | Virginia sneezeweed | U.S.A. (MO, VA) | Asteraceae | T | 652 | NA | NA |
| Helianthemum greenei | Island rush-rose | U.S.A. (CA) | Cistaceae | T | 623 | NA | NA |
| Helianthus paradoxus | Pecos (=puzzle, =paradox) sunflower | U.S.A. (NM, TX) | Asteraceae | T | 667 | 17.96(a) | NA |
| Helianthus schweinitzii | Schweinitz's sunflower | U.S.A. (NC, SC) | ......do | E | 424 | NA | NA |
| Helianthus verticillatus | whorled sunflower | U.S.A. (AL, GA, TN) | ......do | E | 842 | NA | NA |
| Helonias bullata | Swamp pink | U.S.A. (DE, GA, MD, NC, NJ, NY, SC, VA) | Liliaceae | T | 326 | NA | NA |
| Heritiera longipetiolata | Ufa halumtanu, Ufa halom tano | U.S. Territory of Guam, U.S. CNMI | Malvaceae | E | 858 | NA | NA |
| Hesperolinon congestum | Marin dwarf-flax | U.S.A. (CA) | Linaceae | T | 575 | NA | NA |
| Hesperomannia arborescens | None | U.S.A. (HI) | Asteraceae | E | 536 | 17.99(c), (e)(1) and (i) | NA |
| Hesperomannia arbuscula | ......do | ......do | ......do | E | 448 | 17.99(e)(1) and (i) | NA |
| Hesperomannia lydgatei | ......do | ......do | ......do | E | 436 | 17.99(a)(1) | NA |
| Hexastylis naniflora | Dwarf-flowered heartleaf | U.S.A. (NC, SC) | Aristolochiaceae | T | 347 | NA | NA |
| Hibiscadelphus distans | Kauai hau kuahiwi | U.S.A. (HI) | Malvaceae | E | 225 | NA | NA |
| Hibiscadelphus giffardianus | Hau kuahiwi | ......do | ......do | E | 595 | 17.99(k) | NA |
| Hibiscadelphus hualalaiensis | ......do | ......do | ......do | E | 595 | 17.99(k) | NA |
| Hibiscadelphus woodii | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Hibiscus arnottianus ssp. immaculatus | Kokio keokeo | ......do | ......do | E | 480 | 17.99(c) | NA |
| Hibiscus brackenridgei | Mao hau hele | ......do | ......do | E | 559 | 17.99(c), (e)(1), (e)(2), (i), and (k) | NA |
| Hibiscus clayi | Clay's hibiscus | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Hibiscus dasycalyx | Neches River rose-mallow | U.S.A. (TX) | ......do | T | 814 | 17.96(a) | NA |
| Hibiscus waimeae ssp. hannerae | Kokio keokeo | U.S.A. (HI) | ......do | E | 590 | 17.99(a)(1) | NA |
| Hoffmannseggia tenella | Slender rush-pea | U.S.A. (TX) | Fabaceae | E | 209 | NA | NA |
| Holocarpha macradenia | Santa Cruz tarplant | U.S.A. (CA) | Asteraceae - Sunflower | T | 690 | 17.96(a) | NA |
| Howellia aquatilis | Water howellia | U.S.A. (CA, ID, MT, OR, WA) | Campanulaceae | T | 542 | NA | NA |
| Hudsonia montana | Mountain golden heather | U.S.A. (NC) | Cistaceae | T | 107 | 17.96(a) | NA |
| Hymenoxys herbacea | Lakeside daisy | U.S.A. (IL, MI, OH), Canada (Ont.) | Asteraceae | T | 310 | NA | NA |
| Hymenoxys texana | Texas prairie dawn-flower | U.S.A. (TX) | ......do | E | 218 | NA | NA |
| Hypericum cumulicola | Highlands scrub hypericum | U.S.A. (FL) | Hypericaceae | E | 256 | NA | NA |
| Ilex cookii | Cook's holly | U.S.A. (PR) | Aquifoliaceae | E | 277 | NA | NA |
| Ilex sintenisii | None | ......do | ......do | E | 461 | NA | NA |
| Iliamna corei | Peter's Mountain mallow | U.S.A. (VA) | Malvaceae | E | 230 | NA | NA |
| Ipomopsis polyantha | Pagosa skyrocket | U.S.A. (CO) | Polemoniaceae | E | 792 | 17.96(a) | NA |
| Ipomopsis sancti-spiritus | Holy Ghost ipomopsis | U.S.A. (NM) | ......do | E | 535 | NA | NA |
| Iris lacustris | Dwarf lake iris | U.S.A. (MI, WI), Canada (Ont.) | Iridaceae | T | 330 | NA | NA |
| Ischaemum byrone | Hilo ischaemum | U.S.A. (HI) | Poaceae | E | 532 | 17.99(a)(1), (c), (e)(1), and (k) | NA |
| Isodendrion hosakae | Aupaka | ......do | Violaceae | T | 414 | 17.99(k) | NA |
| Isodendrion laurifolium | ......do | ......do | ......do | E | 592 | 17.99(a)(1) and (i) | NA |
| Isodendrion longifolium | ......do | ......do | ......do | T | 592 | 17.99(a)(1) and (i) | NA |
| Isodendrion pyrifolium | Wahine noho kula | ......do | ......do | E | 532 | 17.99(c), (e)(1), and (i) | NA |
| Isotria medeoloides | Small whorled pogonia | 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 | 122, 556 | NA | NA |
| Ivesia kingii var. eremica | Ash Meadows ivesia | U.S.A. (NV) | Rosaceae | T | 181 | 17.96(a) | NA |
| Ivesia webberi | Webber's ivesia | U.S.A. (CA, NV) | ......do | T | 836 | 17.96(a) | NA |
| Jacquemontia reclinata | Beach jacquemontia | U.S.A. (FL) | Convolvulaceae | E | 523 | NA | NA |
| Jatropha costaricensis | Costa Rican jatropha | Costa Rica | Euphorbiaceae | E | 154 | NA | NA |
| Juglans jamaicensis | Nogal or West Indian walnut | U.S.A. (PR), Cuba, Hispaniola | Juglandaceae | E | 603 | NA | NA |
| Justicia cooleyi | Cooley's water-willow | U.S.A. (FL) | Acanthaceae | E | 356 | NA | NA |
| Kadua cookiana | `Awiwi | U.S.A. (HI) | Rubiaceae | E | 530 | 17.99(a)(1) | NA |
| Kadua cordata ssp. remyi | Kopa | ......do | ......do | E | 666 | NA | NA |
| Kadua coriacea | Kioele | ......do | ......do | E | 467 | 17.99(e)(1) and (i) | NA |
| Kadua degeneri | None | ......do | ......do | E | 448 | 17.99(i) | NA |
| Kadua laxiflora | Pilo | ......do | ......do | E | 480 | 17.99(c) and (e)(1) | NA |
| Kadua parvula | None | ......do | ......do | E | 448 | 17.99(i) | NA |
| Kadua st.-johnii | ......do | ......do | ......do | E | 441 | 17.99(a)(1) | NA |
| Kanaloa kahoolawensis | Kohe malama malama o kanaloa | ......do | Fabaceae | E | 666 | 17.99(e)(2) | NA |
| Keysseria erici | No common name | ......do | Asteraceae | E | 765 | 17.99(a) | NA |
| Keysseria helenae | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Kokia cookei | Cooke's koki‘o | ......do | Malvaceae | E | 74 | 17.99(c) | NA |
| Kokia drynarioides | Koki‘o | ......do | ......do | E | 167 | 17.96(a) | NA |
| Kokia kauaiensis | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Korthalsella degeneri | Hulumoa | ......do | Santalaceae | E | 806 | 17.99(i) | NA |
| Labordia cyrtandrae | Kamakahala | ......do | Loganiaceae | E | 591 | 17.99(i) | NA |
| Labordia helleri | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Labordia lydgatei | ......do | ......do | ......do | E | 436 | 17.99(a)(1) | NA |
| Labordia pumila | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Labordia tinifolia var. lanaiensis | ......do | ......do | ......do | E | 666 | NA | NA |
| Labordia tinifolia var. wahiawaensis | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Labordia triflora | ......do | ......do | ......do | E | 666 | 17.99(c) | NA |
| Lasthenia burkei | Burke's goldfields | U.S.A. (CA) | Asteraceae | E | 453 | NA | NA |
| Lasthenia conjugens | Contra Costa goldfields | ......do | ......do | E | 619 | 17.96(a) | NA |
| Layia carnosa | Beach layia | ......do | ......do | E | 472 | NA | NA |
| Leavenworthia crassa | fleshy-fruit gladecress | U.S.A. (AL) | Brassicaceae | E | 842 | NA | NA |
| Leavenworthia exigua var. laciniata | Kentucky glade cress | U.S.A. (KY) | ......do | T | 833 | 17.96(a) | NA |
| Leavenworthia texana | Texas golden gladecress | U.S.A. (TX) | ......do | E | 814 | 17.96(a) | NA |
| Lembertia congdonii | San Joaquin wooly-threads | U.S.A. (CA) | Asteraceae | E | 395 | NA | NA |
| Lepanthes eltoroensis | None | U.S.A. (PR) | Orchidaceae | E | 451 | NA | NA |
| Lepidium arbuscula | Anaunau | U.S.A. (HI) | Brassicaceae | E | 591 | 17.99(i) | NA |
| Lepidium barnebyanum | Barneby ridge-cress | U.S.A. (UT) | ......do | E | 402 | NA | NA |
| Lepidium papilliferum | Slickspot peppergrass | U.S.A. (ID) | ......do | T | 765 | NA | NA |
| Leptocereus grantianus | None | U.S.A. (PR) | Cactaceae | E | 491 | NA | NA |
| Lespedeza leptostachya | Prairie bush-clover | U.S.A. (IA, IL, MN, WI) | Fabaceae | T | 254 | NA | NA |
| Lesquerella congesta | Dudley Bluffs bladderpod | U.S.A. (CO) | Brassicaceae | T | 374 | NA | NA |
| Lesquerella kingii ssp. bernardina | San Bernardino Mountains bladderpod | U.S.A. (CA) | ......do | E | 548 | 17.96(a) | NA |
| Lesquerella lyrata | Lyrate bladderpod | U.S.A. (AL) | ......do | T | 403 | NA | NA |
| Lesquerella pallida | White bladderpod | U.S.A. (TX) | ......do | E | 260 | NA | NA |
| Lesquerella perforata | Spring Creek bladderpod | U.S.A. (TN) | ......do | E | 599 | NA | NA |
| Lesquerella thamnophila | Zapata bladderpod | U.S.A. (TX), Mexico | ......do | E | 671 | 17.96(a) | NA |
| Lesquerella tumulosa | Kodachrome bladderpod | U.S.A. (UT) | ......do | E | 519 | NA | NA |
| Lessingia germanorum (=L. g. var. germanorum) | San Francisco lessingia | U.S.A. (CA) | Asteraceae | E | 620 | NA | NA |
| Liatris helleri | Heller's blazingstar | U.S.A. (NC) | ......do | T | 300 | NA | NA |
| Liatris ohlingerae | Scrub blazingstar | U.S.A. (FL) | ......do | E | 356 | NA | NA |
| Lilaeopsis schaffneriana var. recurva | Huachuca water-umbel | U.S.A. (AZ), Mexico | Apiaceae | E | 600 | 17.96(a) | NA |
| Lilium occidentale | Western lily | U.S.A. (OR, CA) | Liliaceae | E | 544 | NA | NA |
| Lilium pardalinum ssp. pitkinense | Pitkin Marsh lily | U.S.A. (CA) | ......do | E | 625 | NA | NA |
| Limnanthes floccosa ssp.grandiflora | large-flowered woolly meadowfoam | U.S.A. (OR) | Limnanthaceae | E | 733 | 17.96(a) | NA |
| Limnanthes pumila ssp. Grandiflora | ......do | ......do | ......do | E | 733 | 17.96(a) | NA |
| Limnanthes vinculans | Sebastopol meadowfoam | U.S.A. (CA) | ......do | E | 453 | NA | NA |
| Lindera melissifolia | Pondberry | U.S.A. (AL, AR, FL, GA, LA, MO, MS, NC, SC) | Lauraceae | E | 240 | NA | NA |
| Linum carteri var. carteri | Carter's small-flowered flax | U.S.A. (FL) | Linaceae | E | 844 | 17.96(a) | NA |
| Lipochaeta fauriei | Nehe | U.S.A. (HI) | Asteraceae | E | 530 | 17.99(a)(1) | NA |
| Lipochaeta lobata var. leptophylla | ......do | ......do | ......do | E | 448 | 17.99(i) | NA |
| Lipochaeta micrantha | ......do | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Lipochaeta venosa | None | ......do | ......do | E | 73 | NA | NA |
| Lipochaeta waimeaensis | Nehe | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Lithophragma maximum | San Clemente Island woodland-star | U.S.A. (CA) | Saxifragaceae | E | 624 | NA | NA |
| Lobelia koolauensis | None | U.S.A. (HI) | Campanulaceae | E | 591 | 17.99(i) | NA |
| Lobelia monostachya | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Lobelia niihauensis | ......do | ......do | ......do | E | 448 | 17.99(i) | NA |
| Lobelia oahuensis | ......do | ......do | ......do | E | 536 | 17.99(i) | NA |
| Lomatium bradshawii | Bradshaw's desert-parsley | U.S.A. (OR, WA) | Apiaceae | E | 333 | NA | NA |
| Lomatium cookii | Cook's lomatium (Cook's desert parsley) | U.S.A. (OR) | ......do | E | 733 | 17.96(a) | NA |
| Lupinus aridorum | Scrub lupine | U.S.A. (FL) | Fabaceae | E | 264 | NA | NA |
| Lupinus nipomensis | Nipomo Mesa lupine | U.S.A. (CA) | ......do | E | 691 | NA | NA |
| Lupinus sulphureus ssp. kincaidii | Kincaid's lupine | U.S.A (OR, WA) | Fabaceae - Pea family | T | 679 | 17.96 | NA |
| Lupinus tidestromii | Clover lupine | U.S.A. (CA) | Fabaceae | E | 472 | NA | NA |
| Lyonia truncata var. proctorii | None | U.S.A. (PR) | Ericaceae | E | 501 | NA | NA |
| Lysimachia asperulaefolia | Rough-leaved loosestrife | U.S.A. (NC, SC) | Primulaceae | E | 274 | NA | NA |
| Lysimachia daphnoides | Lehua makanoe | U.S.A. (HI) | ......do | E | 765 | 17.99(a) | NA |
| Lysimachia filifolia | None | ......do | ......do | E | 530 | 17.99(a)(1) and (i) | NA |
| Lysimachia iniki | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Lysimachia lydgatei | ......do | ......do | ......do | E | 467 | 17.99(e)(1) | NA |
| Lysimachia maxima | ......do | ......do | ......do | E | 594 | 17.99(c) | NA |
| Lysimachia pendens | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Lysimachia pendens | No common name | ......do | Myrsinaceae | E | 765 | 17.99(a) | NA |
| Lysimachia scopulensis | None | ......do | Primulaceae | E | 765 | 17.99(a) | NA |
| Lysimachia venosa | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Macbridea alba | White birds-in-a-nest | U.S.A. (FL) | Lamiaceae | T | 463 | NA | NA |
| Maesa walkeri | None | U.S. Territory of Guam, U.S. CNMI | Primulaceae | T | 858 | NA | NA |
| Malacothamnus clementinus | San Clemente Island bush-mallow | U.S.A. (CA) | Malvaceae | E | 26 | NA | NA |
| Malacothamnus fasciculatus var. nesioticus | Santa Cruz Island bushmallow | ......do | ......do | E | 623 | NA | NA |
| Malacothrix indecora | Santa Cruz Island malocothrix | ......do | Asteraceae | E | 623 | NA | NA |
| Malacothrix squalida | Island malacothrix | ......do | ......do | E | 623 | NA | NA |
| Kokia cookei | Cooke's kokio | U.S.A. (HI) | Malvaceae | E | 74 | 17.99(c) | NA |
| Manihot walkerae | Walker's manioc | U.S.A. (TX), Mexico | Euphorbiaceae | E | 445 | NA | NA |
| Marshallia mohrii | Mohr's Barbara's buttons | U.S.A. (AL, GA) | Asteraceae | T | 324 | NA | NA |
| Melanthera kamolensis | Nehe | U.S.A. (HI) | ......do | E | 467 | 17.99(e)(1) | NA |
| Melanthera tenuifolia | Nehe | ......do | ......do | E | 448 | 17.99(i) | NA |
| Melicope adscendens | Alani | ......do | Rutaceae | E | 565 | 17.99(e)(1) | NA |
| Melicope balloui | ......do | ......do | ......do | E | 565 | 17.99(e)(1) | NA |
| Melicope christophersenii | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Melicope degeneri | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Melicope haupuensis | ......do | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Melicope hiiakae | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Melicope knudsenii | ......do | ......do | ......do | E | 530 | 17.99(a)(1) and (e)(1) | NA |
| Melicope lydgatei | ......do | ......do | ......do | E | 536 | 17.99(i) | NA |
| Melicope makahae | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Melicope mucronulata | ......do | ......do | ......do | E | 467 | 17.99(c) and (e)(1) | NA |
| Melicope munroi | ......do | ......do | ......do | E | 666 | 17.99(c) | NA |
| Melicope ovalis | ......do | ......do | ......do | E | 565 | 17.99(e)(1) | NA |
| Melicope pallida | ......do | ......do | ......do | E | 530 | 17.99(a)(1) and (i) | NA |
| Melicope paniculata | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Melicope puberula | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Melicope quadrangularis | ......do | ......do | ......do | E | 530 | NA | NA |
| Melicope reflexa | ......do | ......do | ......do | E | 480 | 17.99(c) | NA |
| Melicope saint-johnii | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Melicope zahlbruckneri | ......do | ......do | ......do | E | 595 | 17.99(k) | NA |
| Mentzelia leucophylla | Ash Meadows blazing-star | U.S.A. (NV) | Loasaceae | T | 181 | 17.96(a) | NA |
| Mezoneuron kavaiense | Uhi uhi | U.S.A. (HI) | Fabaceae | E | 238 | NA | NA |
| Mimulus michiganensis (=Mimulus glabratus var. michiganensis) | Michigan monkey-flower | U.S.A. (MI) | Scrophulariaceae | E | 392, 780 | NA | NA |
| Mirabilis macfarlanei | MacFarlane's four-o'clock | U.S.A. (ID, OR) | Nyctaginaceae | T | 66, 581 | NA | NA |
| Mitracarpus maxwelliae | None | U.S.A. (PR) | Rubiaceae | E | 551 | NA | NA |
| Mitracarpus polycladus | ......do | U.S.A. (PR), Saba | ......do | E | 551 | NA | NA |
| Monardella viminea | Willowy monardella | U.S.A. (CA), Mexico | Lamiaceae | E | 649 | 17.96(a) | NA |
| Mucuna sloanei var. persericea | Sea bean | U.S.A. (HI) | Fabaceae | E | 815 | 17.99(e)(1) | NA |
| Myrcia paganii | None | U.S.A. (PR) | Myrtaceae | E | 529 | NA | NA |
| Myrsine juddii | Kolea | U.S.A. (HI) | Primulaceae | E | 591 | 17.99(i) | NA |
| Myrsine knudsenii | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Myrsine linearifolia | ......do | ......do | ......do | T | 590 | 17.99(a)(1) | NA |
| Myrsine mezii | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Myrsine vaccinioides | ......do | ......do | Myrsinaceae | E | 815 | 17.99(e)(1) | NA |
| Navarretia fossalis | Spreading navarretia | U.S.A. (CA), Mexico (Baja California) | Polemoniaceae | T | 650 | 17.96(a) | NA |
| Navarretia leucocephala ssp. pauciflora (=N. pauciflora) | Few-flowered navarretia | U.S.A. (CA) | ......do | E | 619 | NA | NA |
| Navarretia leucocephala ssp. plieantha | Many-flowered navarretia | ......do | ......do | E | 619 | NA | NA |
| Neostapfia colusana | Colusa grass | ......do | Poaceae | T | 611 | 17.96(a) | NA |
| Neraudia angulata | None | U.S.A. (HI) | Urticaceae | E | 448 | 17.99(i) | NA |
| Neraudia ovata | ......do | ......do | ......do | E | 595 | 17.99(k) | NA |
| Neraudia sericea | ......do | ......do | ......do | E | 559 | 17.99(c), (e)(1), and (e)(2) | NA |
| Nervilia jacksoniae | None | U.S. Territory of Guam, U.S. CNMI | Orchidaceae | T | 858 | NA | NA |
| Nesogenes rotensis | None | Western Pacific Ocean - U.S.A. (Commonwealth of the Northern Mariana Islands) | Verbenaceae - Verbena family | E | 742 | NA | NA |
| Nitrophila mohavensis | Amargosa niterwort | U.S.A. (CA, NV) | Chenopodiaceae | E | 181 | 17.96(a) | NA |
| Nolina brittoniana | Britton's beargrass | U.S.A. (FL) | Agavaceae | E | 500 | NA | NA |
| Nothocestrum breviflorum | Aiea | U.S.A (HI) | Solanaceae | E | 532 | 17.99(k) | NA |
| Nothocestrum peltatum | ......do | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Nototrichium humile | Kului | ......do | Amaranthaceae | E | 448 | 17.99(e)(1) and (i) | NA |
| Ochrosia kilaueaensis | Holei | ......do | Apocynaceae | E | 532 | NA | NA |
| Oenothera avita ssp. eurekensis | Eureka Valley evening-primrose | U.S.A. (CA) | Onagraceae | E | 39 | NA | NA |
| Oenothera deltoides ssp. howellii | Antioch Dunes evening-primrose | ......do | ......do | E | 39 | 17.96(a) | NA |
| Opuntia treleasei | Bakersfield cactus | ......do | Cactaceae | E | 395 | NA | NA |
| Orcuttia californica | California Orcutt grass | ......do | Poaceae | E | 512 | NA | NA |
| Orcuttia inaequalis | San Joaquin Valley Orcutt grass | ......do | ......do | T | 611 | 17.96(a) | NA |
| Orcuttia pilosa | Hairy Orcutt grass | ......do | ......do | T | 611 | 17.96(a) | NA |
| Orcuttia tenuis | Slender Orcutt grass | ......do | ......do | T | 611 | 17.96(a) | NA |
| Orcuttia viscida | Sacramento Orcutt grass | ......do | ......do | T | 611 | 17.96(a) | NA |
| Osmoxylon mariannense | None | Western Pacific Ocean - U.S.A. (Commonwealth of the Northern Mariana Islands) | Araliaceae - Ginseng family | E | 742 | NA | NA |
| Ottoschulzia rhodoxylon | Palo de rosa | U.S.A. (PR), Dominican Republic | Icacinaceae | E | 385 | NA | NA |
| Oxypolis canbyi | Canby's dropwort | U.S.A. (DE, GA, MD, NC, SC) | Apiaceae | E | 217 | NA | NA |
| Oxytheca parishii var. goodmaniana | Cushenbury oxytheca | U.S.A. (CA) | Polygonaceae | E | 548 | 17.96(a) | NA |
| Oxytropis campestris var. chartacea | Fassett's locoweed | U.S.A. (WI) | Fabaceae | T | 329 | NA | NA |
| Panicum fauriei var. carteri | Carter's panicgrass | U.S.A. (HI) | Poaceae | E | 133 | 17.96(a) | NA |
| Panicum niihauense | Lau ehu | ......do | ......do | E | 592 | 17.99(a)(1) | NA |
| Paronychia chartacea | Papery whitlow-wort | U.S.A. (FL) | Caryophyllaceae | T | 256 | NA | NA |
| Parvisedum leiocarpum | Lake County stonecrop | U.S.A. (CA) | Crassulaceae | E | 619 | NA | NA |
| Pedicularis furbishiae | Furbish lousewort | U.S.A. (ME), Canada (N.B.) | Scrophulariaceae | E | 39 | NA | NA |
| Pediocactus bradyi | Brady pincushion cactus | U.S.A. (AZ) | Cactaceae | E | 63 | NA | NA |
| Pediocactus despainii | San Rafael cactus | U.S.A. (UT) | ......do | E | 286 | NA | NA |
| Pediocactus knowltonii | Knowlton cactus | U.S.A. (CO, NM) | ......do | E | 72 | NA | NA |
| Pediocactus peeblesianus var. fickeiseniae | Fickeisen plains cactus | U.S.A. (AZ) | ......do | E | 821 | NA | NA |
| Pediocactus peeblesianus var. peeblesianus | Peebles Navajo cactus | ......do | ......do | E | 69 | NA | NA |
| Pediocactus sileri | Siler pincushion cactus | U.S.A. (AZ, UT) | ......do | T | 64, 524 | NA | NA |
| Pediocactus winkleri | Winkler cactus | U.S.A. (UT) | ......do | T | 641 | NA | NA |
| Penstemon debilis | Parachute beardtongue | U.S.A. (CO) | Plantaginaceae | T | 792 | 17.96(a) | NA |
| Penstemon haydenii | Blowout penstemon | U.S.A. (NE) | Scrophulariaceae | E | 285 | NA | NA |
| Penstemon penlandii | Penland beardtongue | U.S.A. (CO) | ......do | E | 353 | NA | NA |
| Pentachaeta bellidiflora | White-rayed pentachaeta | U.S.A. (CA) | Asteraceae | E | 575 | NA | NA |
| Pentachaeta lyonii | Lyon's pentachaeta | ......do | ......do | E | 606 | 17.96(a) | NA |
| Peperomia subpetiolata | Alaala wai nui | U.S.A. (HI) | Piperaceae | E | 815 | 17.99(e)(1) | NA |
| Peperomia wheeleri | Wheeler's peperomia | U.S.A. (PR) | ......do | E | 255 | NA | NA |
| Peucedanum sandwicense | Makou | U.S.A. (HI) | Apiaceae | T | 530 | 17.99(a)(1), (c), (e)(1), and (i) | NA |
| Phacelia argillacea | Clay phacelia | U.S.A. (UT) | Hydrophyllaceae | E | 44 | NA | NA |
| Phacelia formosula | North Park phacelia | U.S.A. (CO) | ......do | E | 121 | NA | NA |
| Phacelia insularis ssp. insularis | Island phacelia | U.S.A. (CA) | ......do | E | 623 | NA | NA |
| Phacelia submutica | DeBeque phacelia | U.S.A. (CO) | ......do | T | 792 | 17.96(a) | NA |
| Phlox hirsuta | Yreka phlox | U.S.A. (CA) | Polemoniaceae | E | 683 | NA | NA |
| Phlox nivalis ssp. texensis | Texas trailing phlox | U.S.A. (TX) | ......do | E | 440 | NA | NA |
| Phyllanthus saffordii | None | U.S. Territory of Guam | Phyllanthaceae | E | 858 | NA | NA |
| Phyllostegia bracteata | None | U.S.A. (HI) | Lamiaceae | E | 815 | 17.99(e)(1) | NA |
| Phyllostegia floribunda | None | ......do | ......do | E | 818 | NA | NA |
| Phyllostegia glabra var. lanaiensis | None | ......do | ......do | E | 435 | NA | NA |
| Phyllostegia haliakalae | None | ......do | ......do | E | 815 | 17.99(c) and (e)(1) | NA |
| Phyllostegia hirsuta | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Phyllostegia hispida | ......do | ......do | ......do | E | 762 | 17.99(c) | NA |
| Phyllostegia kaalaensis | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Phyllostegia knudsenii | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Phyllostegia mannii | ......do | ......do | ......do | E | 480 | 17.99(c) and (e)(1) | NA |
| Phyllostegia mollis | ......do | ......do | ......do | E | 448 | 17.99(e)(1) and (i) | NA |
| Phyllostegia parviflora | ......do | ......do | ......do | E | 592 | 17.99(i) | NA |
| Phyllostegia pilosa | ......do | ......do | ......do | E | 815 | 17.99(c) and (e)(1) | NA |
| Phyllostegia racemosa | Kiponapona | ......do | ......do | E | 595 | 17.99(k) | NA |
| Phyllostegia renovans | No common name | ......do | ......do | E | 765 | 17.99(a) | NA |
| Phyllostegia velutina | None | ......do | ......do | E | 595 | 17.99(k) | NA |
| Phyllostegia waimeae | ......do | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Phyllostegia warshaueri | ......do | ......do | ......do | E | 595 | 17.99(k) | NA |
| Phyllostegia wawrana | ......do | ......do | ......do | E | 59 0 | 17.99(a)(1) | NA |
| Physaria douglasii subsp. tuplashensis | White Bluffs bladderpod | U.S.A. (WA) | Brassicaceae | T | 811 | 17.96(a) | NA |
| Physaria filiformis (=Lesquerella f.) | Missouri bladderpod | U.S.A. (AR, MO) | ......do | T | 253, 739, 780 | NA | NA |
| Physaria globosa | Short's bladderpod | U.S.A. (IN, KY, TN) | ......do | E | 842 | NA | NA |
| Physaria obcordata | Dudley Bluffs twinpod | U.S.A. (CO) | ......do | T | 374 | NA | NA |
| Pilosocereus robinii | Key tree-cactus | U.S.A. (FL), Cuba | Cactaceae | E | 153 | NA | NA |
| Pinguicula ionantha | Godfrey's butterwort | U.S.A. (FL) | Lentibulariaceae | T | 507 | NA | NA |
| Piperia yadonii | Yadon's piperia | U.S.A (CA) | Orchidaceae (Orchid) | E | 1998 | 17.96(a) | NA |
| Pittosporum halophilum | Hoawa | U.S.A. (HI) | Pittosporaceae | E | 815 | 17.99(c) | NA |
| Pittosporum hawaiiense | Hoawa, haawa | ......do | ......do | E | 818 | NA | NA |
| Pittosporum napaliense | Hoawa | ......do | ......do | E | 765 | 17.99(a) | NA |
| Pityopsis ruthii | Ruth's golden aster | U.S.A. (TN) | Asteraceae | E | 191 | NA | NA |
| Plagiobothrys hirtus | Rough popcornflower | U.S.A. (OR) | Boraginaceae | E | 678 | NA | NA |
| Plagiobothrys strictus | Calistoga allocarya | U.S.A. (CA) | ......do | E | 625 | NA | NA |
| Plantago hawaienis | Laukahi kuahiwi | U.S.A (HI) | Plantaginaceae | E | 532 | 17.99(k) | NA |
| Plantago princeps | ......do | ......do | ......do | E | 559 | 17.99(a)(1), (c), (e)(1), and (i) | NA |
| Platanthera holochila | None | ......do | Orchidaceae | E | 592 | 17.99(a)(1), (c), (e)(1), and (i) | NA |
| Platanthera leucophaea | Eastern prairie fringed orchid | U.S.A. (AR, IA, IL, IN, ME, MI, MO, NE, NJ, NY, OH, OK, PA, VA, WI), Canada (Ont., N.B.) | ......do | T | 368 | NA | NA |
| Platanthera praeclara | Western prairie fringed orchid | U.S.A. (IA, KS, MN, MO, ND, NE, OK, SD), Canada (Man.) | ......do | T | 368 | NA | NA |
| Platydesma cornuta var. cornuta | None | U.S.A. (HI) | Rutaceae | E | 806 | 17.99(i) | NA |
| Platydesma cornuta var. decurrens | None | ......do | ......do | E | 806 | 17.99(i) | NA |
| Platydesma remyi | None | ......do | ......do | E | 818 | NA | NA |
| Platydesma rostrata | Pilo kea lau lii | ......do | ......do | E | 765 | 17.99(a) | NA |
| Pleodendron macranthum | Chupacallos | U.S.A. (PR) | Canellaceae | E | 564 | NA | NA |
| Pleomele fernaldii | Hala pepe | U.S.A. (HI) | Asparagaceae | E | 815 | NA | NA |
| Pleomele forbesii | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Pleomele hawaiiensis | ......do | ......do | ......do | E | 595 | 17.99(k) | NA |
| Poa atropurpurea | San Bernardino bluegrass | U.S.A. (CA) | Poaceae | E | 644 | 17.96(a) | NA |
| Poa mannii | Mann's bluegrass | U.S.A. (HI) | ......do | E | 558 | 17.99(a)(1) | NA |
| Poa napensis | Napa bluegrass | U.S.A. (CA) | ......do | E | 625 | NA | NA |
| Poa sandvicensis | Hawaiian bluegrass | U.S.A. (HI) | ......do | E | 464 | 17.99(a)(1) | NA |
| Poa siphonoglossa | None | ......do | ......do | E | 464 | 17.99(a)(1) | NA |
| Pogogyne abramsii | San Diego mesa mint | U.S.A. (CA) | Lamiaceae | E | 44 | NA | NA |
| Pogogyne nudiuscula | Otay mesa mint | U.S.A. (CA), Mexico (Baja California) | ......do | E | 512 | NA | NA |
| Polygala lewtonii | Lewton's polygala | U.S.A. (FL) | Polygalaceae | E | 500 | NA | NA |
| Polygala smallii | Tiny polygala | ......do | ......do | E | 192 | NA | NA |
| Polygonella basiramia | Wireweed | ......do | Polygonaceae | E | 256 | NA | NA |
| Polygonella myriophylla | Sandlace | ......do | ......do | E | 500 | NA | NA |
| Polygonum hickmanii | Scotts Valley polygonum | U.S.A. (CA) | ......do | E | 736 | 17.96(a) | NA |
| Polyscias bisattenuata | None | U.S.A. (HI) | Araliaceae | E | 765 | 17.99(a) | NA |
| Polyscias flynnii | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Polyscias gymnocarpa | `Ohe`ohe | ......do | ......do | E | 536 | 17.99(i) | NA |
| Polyscias lydgatei | None | ......do | ......do | E | 806 | 17.99(i) | NA |
| Polyscias racemosa | ......do | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Portulaca sclerocarpa | Poe | ......do | Portulacaceae | E | 532 | 17.99(k) | NA |
| Potamogeton clystocarpus | Little Aguja pondweed | U.S.A. (TX) | Potamogetonaceae | E | 450 | NA | NA |
| Potentilla hickmanii | Hickman's potentilla | U.S.A. (CA) | Rosaceae | E | 640 | NA | NA |
| Primula maguirei | Maguire primrose | U.S.A. (UT) | Primulaceae | T | 199 | NA | NA |
| Pritchardia aylmer-robinsonii | Wahane | U.S.A, (HI) | Arceaceae | E | 586 | NA | NA |
| Pritchardia hardyi | Loulu | ......do | ......do | E | 765 | NA | NA |
| Pritchardia kaalae | ......do | ......do | ......do | E | 591 | NA | NA |
| Pritchardia lanigera | ......do | ......do | ......do | E | 818 | NA | NA |
| Pritchardia maideniana | ......do | ......do | ......do | E | 532 | NA | NA |
| Pritchardia munroi | ......do | ......do | ......do | E | 480 | NA | NA |
| Pritchardia napaliensis | ......do | ......do | ......do | E | 590 | NA | NA |
| Pritchardia remota | ......do | ......do | ......do | E | 587 | 17.99(g) | NA |
| Pritchardia schattaueri | ......do | ......do | ......do | E | 595 | NA | NA |
| Pritchardia viscosa | ......do | ......do | ......do | E | 590 | NA | NA |
| Prunus geniculata | Scrub plum | U.S.A. (FL) | Rosaceae | E | 256 | NA | NA |
| Pseudobahia bahiifolia | Hartweg's golden sunburst | U.S.A. (CA) | Asteraceae | E | 609 | NA | NA |
| Pseudobahia | San Joaquin adobe sunburst | ......do | ......do | T | 609 | NA | NA |
| Psychotria grandiflora | Kopiko | U.S.A. (HI) | Rubiaceae | E | 765 | 17.99(a) | NA |
| Psychotria hexandra ssp. oahuensis | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Psychotria hobdyi | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Psychotria malaspinae | Aplokating palaoan | U.S. Territory of Guam | Rubiaceae | E | 858 | NA | NA |
| Pteralyxia kauaiensis | Kaulu | U.S.A. (HI) | Apocynaceae | E | 530 | 17.99(a)(1) | NA |
| Pteralyxia macrocarpa | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Ptilimnium nodosum | Harperella | U.S.A. (AL, AR, GA, MD, NC, SC, WV) | Apiaceae | E | 332 | NA | NA |
| Purshia subintegra | Arizona cliffrose | U.S.A. (AZ) | Rosaceae | E | 148 | NA | NA |
| Quercus hinckleyi | Hinckley's oak | U.S.A. (TX) | Fagaceae | T | 318 | NA | NA |
| Ranunculus acriformis var. aestivalis | Autumn buttercup | U.S.A. (UT) | Ranunculaceae | E | 355 | NA | NA |
| Remya kauaiensis | None | U.S.A. (HI) | Asteraceae | E | 413 | 17.99(a)(1) | NA |
| Remya mauiensis | Maui remya | ......do | ......do | E | 413 | 17.99(e)(1) | NA |
| Remya montgomeryi | None | ......do | ......do | E | 413 | 17.99(a)(1) | NA |
| Rhodiola integrifolia ssp. leedyi (= Sedum integrifolium ssp. l.) | Leedy's roseroot | U.S.A. (MN, NY) | Crassulaceae | T | 460, 780 | NA | NA |
| Rhododendron chapmanii | Chapman rhododendron | U.S.A. (FL) | Ericaceae | E | 47 | NA | NA |
| Rhus michauxii | Michaux's sumac | U.S.A. (GA, NC, SC, VA) | Anacardiaceae | E | 367 | NA | NA |
| Rhynchospora knieskernii | Knieskern's beaked-rush | U.S.A. (DE, NJ) | Cyperaceae | T | 429 | NA | NA |
| Ribes echinellum | Miccosukee gooseberry | U.S.A. (FL, SC) | Saxifragaceae | T | 190 | NA | NA |
| Rorippa gambellii | Gambel's watercress | U.S.A. (CA) | Brassicaceae | E | 511 | NA | NA |
| Sagittaria fasciculata | Bunched arrowhead | U.S.A. (NC, SC) | Alismataceae | E | 53 | NA | NA |
| Sagittaria secundifolia | Kral's water-plantain | U.S.A. (AL, GA) | ......do | T | 386 | NA | NA |
| Sanicula mariversa | None | U.S.A. (HI) | Apiaceae | E | 448 | 17.99(i) | NA |
| Sanicula purpurea | ......do | ......do | ......do | E | 592 | 17.99(e)(1) and (i) | NA |
| Santalum haleakalae var. lanaiense | Lanai sandalwood, iliahi | ......do | Santalaceae | E | 215, 815 | 17.99(c) and (e)(1) | NA |
| Sarracenia oreophila | Green pitcher-plant | U.S.A. (AL, GA, NC, TN) | Sarraceniaceae | E | 56, 89 | NA | NA |
| Sarracenia rubra ssp. alabamensis | Alabama canebrake pitcher-plant | U.S.A. (AL) | ......do | E | 346 | NA | NA |
| Sarracenia rubra ssp. jonesii | Mountain sweet pitcher-plant | U.S.A. (NC, SC) | ......do | E | 339 | NA | NA |
| Scaevola coriacea | Dwarf naupaka | U.S.A. (HI) | Goodeniaceae | E | 231 | NA | NA |
| Schenkia sebaeoides | Awiwi | ......do | Gentianaceae | E | 448 | 17.99(a)(1), (c), (e)(1), and (i) | NA |
| Schiedea adamantis | Diamond Head schiedea | ......do | Caryophyllaceae | E | 141 | NA | NA |
| Schiedea apokremnos | Maolioli | ......do | ......do | E | 441 | 17.99(a)(1) | NA |
| Schiedea attenuata | No common name | ......do | ......do | E | 765 | 17.99(a) | NA |
| Schiedea diffusa ssp. macraei | None | ......do | ......do | E | 818 | NA | NA |
| Schiedea haleakalensis | None | ......do | ......do | E | 467 | 17.99(e)(1) | NA |
| Schiedea hawaiiensis | None | ......do | ......do | E | 818 | NA | NA |
| Schiedea helleri | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Schiedea hookeri | ......do | ......do | ......do | E | 592 | 17.99(i) | NA |
| Schiedea jacobii | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Schiedea kaalae | ......do | ......do | ......do | E | 448 | 17.99(i) | NA |
| Schiedea kauaiensis | ......do | ......do | ......do | E | 592 | 17.99(a)(1) | NA |
| Schiedea kealiae | Maolioli | ......do | ......do | E | 591 | 17.99(i) | NA |
| Schiedea laui | None | ......do | ......do | E | 815 | 17.99(c) | NA |
| Schiedea lychnoides | Kuawawaenohu | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Schiedea lydgatei | None | ......do | ......do | E | 480 | 17.99(c) | NA |
| Schiedea membranacea | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Schiedea nuttallii | ......do | ......do | ......do | E | 592 | 17.99(a)(1), (c), and (i) | NA |
| Schiedea obovata | ......do | ......do | ......do | E | 448 | 17.99(i) | NA |
| Schiedea salicaria | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Schiedea sarmentosa | ......do | ......do | ......do | E | 594 | 17.99(c) | NA |
| Schiedea spergulina var. leiopoda | ......do | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Schiedea spergulina var. spergulina | ......do | ......do | ......do | T | 530 | 17.99(a)(1) | NA |
| Schiedea stellarioides | Laulihilihi (=Maolioli) | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Schiedea trinervis | None | ......do | ......do | E | 448 | 17.99(i) | NA |
| Schiedea verticillata | ......do | ......do | ......do | E | 587 | 17.99(g) | NA |
| Schiedea viscosa | ......do | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Schoenocrambe argillacea | Clay reed-mustard | U.S.A. (UT) | Brassicaceae | T | 457 | NA | NA |
| Schoenocrambe barnebyi | Barneby reed-mustard | ......do | ......do | E | 457 | NA | NA |
| Schoenocrambe suffrutescens | Shrubby reed-mustard | ......do | ......do | E | 293 | NA | NA |
| Schoepfia arenaria | None | U.S.A. (PR) | Olacaceae | T | 420 | NA | NA |
| Schwalbea americana | American chaffseed | U.S.A. (AL, CT, DE, FL, GA, LA, MA, MD, MI, MS, NC, NJ, NY, SC, TN, VA) | Scrophulariaceae | E | 478 | NA | NA |
| Scirpus ancistrochaetus | Northeastern bulrush | U.S.A. (MA, MD, NH, NY, PA, VA, VT, WV) | Cyperaceae | E | 425 | NA | NA |
| Sclerocactus brevispinus | Pariette cactus | U.S.A. (UT) | Cactaceae | T | 59 | NA | NA |
| Sclerocactus glaucus | Colorado hookless cactus | U.S.A. (CO) | ......do | T | 59 | NA | NA |
| Sclerocactus mesae-verdae | Mesa Verde cactus | U.S.A. (CO, NM) | ......do | T | 75 | NA | NA |
| Sclerocactus wetlandicus | Uinta Basin hookless cactus | U.S.A. (UT) | ......do | T | 59 | NA | NA |
| Sclerocactus wrightiae | Wright fishhook cactus | ......do | ......do | E | 58 | NA | NA |
| Scutellaria floridana | Florida skullcap | U.S.A. (FL) | Lamiaceae | T | 463 | NA | NA |
| Scutellaria montana | Large-flowered skullcap | U.S.A. (GA, TN) | ......do | T | 234, 720 | NA | NA |
| Senecio franciscanus | San Francisco Peaks groundsel | U.S.A. (AZ) | Asteraceae | T | 137 | 17.96(a) | NA |
| Senecio layneae | Layne's butterweed | U.S.A. (CA) | ......do | T | 596 | NA | NA |
| Serianthes nelsonii | Hayun lagu (Guam), Tronkon guafi (Rota) | Western Pacific Ocean-U.S.A. (GU, MP-Rota) | Fabaceae | E | 257, 259 | NA | NA |
| Sesbania tomentosa | Ohai | U.S.A (HI) | ......do | E | 559 | 17.99(a)(1), (c), (e)(1), (e)(2), (g), (i), and (k) | NA |
| Sibara filifolia | Santa Cruz Island rock-cress | U.S.A. (CA) | Brassicaceae | E | 624 | NA | NA |
| Sicyos albus | `Anunu | U.S.A. (HI) | Cucurbitaceae | E | 595 | 17.99(k) | NA |
| Sidalcea keckii | Keck's checkermallow | U.S.A. (CA) | Malvaceae - Mallow | E | 685 | 17.96(a) | NA |
| Sidalcea nelsoniana | Nelson's checker-mallow | U.S.A. (OR, WA) | Malvaceae | T | 490 | NA | NA |
| Sidalcea oregana var. calva | Wenatchee Mountains checker-mallow | U.S.A. (WA) | Malvaceae - Mallow | E | 673 | 17.96(a) | NA |
| Sidalcea oregana ssp. valida | Kenwood Marsh checker-mallow | U.S.A. (CA) | ......do | E | 625 | NA | NA |
| Sidalcea pedata | Pedate checker-mallow | ......do | ......do | E | 158 | NA | NA |
| Silene alexandri | None | U.S.A. (HI) | Caryophyllaceae | E | 480 | 17.99(c) | NA |
| Silene hawaiiensis | ......do | ......do | ......do | T | 532 | 17.99(k) | NA |
| Silene lanceolata | ......do | ......do | ......do | E | 480 | 17.99(c) and (i) | NA |
| Silene perlmanii | ......do | ......do | ......do | E | 448 | 17.99(i) | NA |
| Silene polypetala | Fringed campion | U.S.A. (FL, GA) | ......do | E | 418 | NA | NA |
| Silene spaldingii | Spalding's catchfly | U.S.A. (OR, ID, MT, WA), Canada (B.C.) | ......do | T | 712 | NA | NA |
| Sisyrinchium dichotomum | White irisette | U.S.A. (NC) | Iridaceae | E | 438 | NA | NA |
| Solanum drymophilum | Erubia | U.S.A. (PR) | Solanaceae | E | 319 | NA | NA |
| Solanum guamense | Biringenas halumtanu, Birengenas halom tano | U.S. Territory of Guam, U.S. CNMI | Solanaceae | E | 858 | NA | NA |
| Solanum incompletum | Popolo ku mai | U.S.A (HI) | ......do | E | 559 | 17.99(e)(1) and (k) | NA |
| Solanum sandwicense | Aiakeakua, popolo | ......do | ......do | E | 530 | 17.99(a)(1) and (i) | NA |
| Solidago albopilosa | White-haired goldenrod | U.S.A. (KY) | Asteraceae | T | 308 | NA | NA |
| Solidago houghtonii | Houghton's goldenrod | U.S.A. (MI), Canada (Ont.) | ......do | T | 314 | NA | NA |
| Solidago shortii | Short's goldenrod | U.S.A. (KY) | ......do | E | 201 | NA | NA |
| Solidago spithamaea | Blue Ridge goldenrod | U.S.A. (NC, TN) | ......do | T | 175 | NA | NA |
| Spermolepis hawaiiensis | None | U.S.A. (HI) | Apiaceae | E | 559 | 17.99(a)(1), (c), (e)(1), and (i) | NA |
| Sphaeralcea gierischii | Gierisch mallow | U.S.A (AZ, UT) | Malvaceae | E | 813 | 17.96(a) | NA |
| Spigelia gentianoides | Gentian pinkroot | U.S.A. (AL, FL) | Loganiaceae | E | 406 | NA | NA |
| Spiraea virginiana | Virginia spiraea | U.S.A. (GA, KY, NC, OH, PA, TN, VA, WV) | Rosaceae | T | 389 | NA | NA |
| Spiranthes delitescens | Canelo Hills ladies'-tresses | U.S.A. (AZ) | Orchidaceae | E | 600 | NA | NA |
| Spiranthes diluvialis | Ute ladies'-tresses | U.S.A. (CO, ID, MT, NE, NV, UT, WA, WY) | ......do | T | 458 | NA | NA |
| Spiranthes parksii | Navasota ladies'-tresses | U.S.A. (TX) | ......do | E | 116 | NA | NA |
| Stahlia monosperma | Cóbana negra | U.S.A. (PR), Dominican Republic | Fabaceae | T | 380 | NA | NA |
| Stenogyne angustifolia var. angustifolia | None | U.S.A. (HI) | Lamiaceae | E | 73 | NA | NA |
| Stenogyne bifida | ......do | ......do | ......do | E | 480 | 17.99(c) | NA |
| Stenogyne campanulata | ......do | ......do | ......do | E | 464 | 17.99(a)(1) | NA |
| Stenogyne cranwelliae | ......do | ......do | ......do | E | 818 | NA | NA |
| Stenogyne kanehoana | ......do | ......do | ......do | E | 466 | 17.99(i) | NA |
| Stenogyne kauaulaensis | ......do | ......do | ......do | E | 815 | 17.99(e)(1) | NA |
| Stenogyne kealiae | No common name | ......do | ......do | E | 765 | 17.99(a) | NA |
| Stephanomeria malheurensis | Malheur wire-lettuce | U.S.A. (OR) | Asteraceae | E | 126 | 17.96(a) | NA |
| Streptanthus albidus ssp. albidus | Metcalf Canyon jewelflower | U.S.A. (CA) | Brassicaceae | E | 575 | NA | NA |
| Streptanthus niger | Tiburon jewelflower | ......do | ......do | E | 575 | NA | NA |
| Styrax portoricensis | Palo de jazmfn | U.S.A. (PR) | Styracaceae | E | 461 | NA | NA |
| Styrax texanus | Texas snowbells | U.S.A. (TX) | ......do | E | 162 | NA | NA |
| Suaeda californica | Seablite, California | U.S.A. (CA) | Chenopodiaceae | E | 567 | NA | NA |
| Swallenia alexandrae | Eureka Dune grass | ......do | Poaceae | E | 39 | NA | NA |
| Tabernaemontana rotensis | None | U.S. Territory of Guam, U.S. CNMI | Apocynaceae | T | 858 | NA | NA |
| Taraxacum californicum | California taraxacum | U.S.A. (CA) | Asteraceae | E | 644 | 17.96(a) | NA |
| Ternstroemia luquillensis | Palo colorado | U.S.A. (PR) | Theaceae | E | 461 | NA | NA |
| Ternstroemia subsessilis | None | ......do | ......do | E | 461 | NA | NA |
| Tetramolopium arenarium | ......do | U.S.A. (HI) | Asteraceae | E | 532 | NA | NA |
| Tetramolopium capillare | Pamakani | ......do | ......do | E | 555 | 17.99(e)(1) | NA |
| Tetramolopium filiforme | None | ......do | ......do | E | 448 | 17.99(i) | NA |
| Tetramolopium lepidotum ssp. lepidotum | ......do | ......do | ......do | E | 448 | 17.99(i) | NA |
| Tetramolopium remyi | ......do | ......do | ......do | E | 435 | 17.99(e)(1) | NA |
| Tetramolopium rockii | ......do | ......do | ......do | T | 480 | 17.99(c) | NA |
| Thalictrum cooleyi | Cooley's meadowrue | U.S.A. (FL, NC) | Ranunculaceae | E | 344 | NA | NA |
| Thelypodium howellii ssp. spectabilis | Howell's spectacular thelypody | U.S.A. (OR) | Brassicaceae | T | 662 | NA | NA |
| Thelypodium stenopetalum | Slender-petaled mustard | U.S.A. (CA) | ......do | E | 158 | NA | NA |
| Thlaspi californicum | Kneeland Prairie penny-cress | ......do | Brassicaceae - Mustard | E | 684 | 17.96(a) | NA |
| Thymophylla tephroleuca | Ashy dogweed | U.S.A. (TX) | Asteraceae | E | 152 | NA | NA |
| Thysanocarpus conchuliferus | Santa Cruz Island fringepod | U.S.A. (CA) | Brassicaceae | E | 623 | NA | NA |
| Tinospora homosepala | None | U.S. Territory of Guam | Menispermaceae | E | 858 | NA | NA |
| Townsendia aprica | Last Chance townsendia | U.S.A. (UT) | Asteraceae | T | 200 | NA | NA |
| Trematolobelia singularis | None | U.S.A. (HI) | Campanulaceae | E | 591 | 17.99(i) | NA |
| Trichilia triacantha | Bariaco | U.S.A. (PR) | Meliaceae | E | 303 | NA | NA |
| Trichostema austromontanum ssp. compactum | Hidden Lake bluecurls | U.S.A. (CA) | Lamiaceae | T | 644 | NA | NA |
| Trifolium amoenum | Showy Indian clover | ......do | Fabaceae | E | 625 | NA | NA |
| Trifolium stoloniferum | Running buffalo clover | U.S.A. (AR, IL, IN, KS, KY, MO, OH, WV) | ......do | E | 270 | NA | NA |
| Trifolium trichocalyx | Monterey clover | U.S.A. (CA) | ......do | E | 640 | NA | NA |
| Trillium persistens | Persistent trillium | U.S.A. (GA, SC) | Liliaceae | E | 39 | NA | NA |
| Trillium reliquum | Relict trillium | U.S.A. (AL, GA, SC) | ......do | E | 306 | NA | NA |
| Tuberolabium guamense | None | U.S. Territory of Guam, U.S. CNMI | Orchidaceae | T | 858 | NA | NA |
| Tuctoria greenei | Greene's tuctoria | U.S.A. (CA) | Poaceae | T | 611 | 17.96(a) | NA |
| Tuctoria mucronata | Solano grass | ......do | ......do | T | 44 | 17.96(a) | NA |
| Urera kaalae | Opuhe | U.S.A. (HI) | Urticaceae | E | 448 | 17.99(i) | NA |
| Varronia rupicola | No common name | Puerto Rico | Boraginaceae | T | 848 | 17.96(a) | NA |
| Verbena californica | Red Hills vervain | U.S.A. (CA) | Verbenaceae | T | 644 | NA | NA |
| Verbesina dissita | Big-leaved crownbeard | U.S.A. (CA), Mexico. | Asteraceae | T | 589 | NA | NA |
| Vernonia proctorii | None | U.S.A. (PR) | ......do | E | 501 | NA | NA |
| Vicia menziesii | Hawaiian vetch | U.S.A. (HI) | Fabaceae | E | 39 | NA | NA |
| Vigna o-wahuensis | None | ......do | ......do | E | 559 | 17.99(c), (e)(1), (e)(2), (i), and (k) | NA |
| Viola chamissoniana ssp. chamissoniana | Pamakani | ......do | Violaceae | E | 448 | 17.99(i) | NA |
| Viola helenae | None | ......do | ......do | E | 436 | 17.99(a)(1) | NA |
| Viola kauaiensis var. wahiawaensis | Nani waialeale | ......do | ......do | E | 590 | 17.99(a)(1) | NA |
| Viola lanaiensis | None | ......do | ......do | E | 435 | NA | NA |
| Viola oahuensis | ......do | ......do | ......do | E | 591 | 17.99(i) | NA |
| Warea amplexifolia | Wide-leaf warea | U.S.A. (FL) | Brassicaceae | E | 266 | NA | NA |
| Warea carteri | Carter's mustard | ......do | ......do | E | 256 | NA | NA |
| Wikstroemia villosa | Akia | U.S.A. (HI) | Thymelaeaceae | E | 815 | 17.99(e)(1) | NA |
| Wilkesia hobdyi | Dwarfiliau | ......do | Asteraceae | E | 473 | 17.99(a)(1) | NA |
| Xylosma crenatum | None | ......do | Salicaceae | E | 464 | 17.99(a)(1) | NA |
| Xyris tennesseensis | Tennessee yellow-eyed grass | U.S.A. (AL, GA, TN) | Xyridaceae | E | 430 | NA | NA |
| Yermo xanthocephalus | Desert yellowhead | U.S.A. (WY) | Asteraceae - Sunflower | T | 723 | 17.96(a) | NA |
| Zanthoxylum dipetalum var. tomentosum | Ae | U.S.A (HI) | Rutaceae | E | 595 | 17.99(k) | NA |
| Zanthoxylum hawaiiense | ......do | ......do | ......do | E | 532 | 17.99(a)(1), (c), and (e)(1) | NA |
| Zanthoxylum oahuense | ......do | ......do | ......do | E | 806 | 17.99(i) | NA |
| Zanthoxylum thomasianum | St. Thomas prickly-ash | U.S.A. (PR, VI) | ......do | E | 213 | NA | NA |
| Zizania texana | Texas wild-rice | U.S.A. (TX) | Poaceae | E | 39 | 17.96(a) | NA |
| Ziziphus celata | Florida ziziphus | U.S.A. (FL) | Rhamnaceae | E | 356 | NA | NA |
| Conifers | |||||||
| Abies guatemalensis | Guatemalan fir (=pinabete) | Mexico, Guatemala, Honduras, El Salvador | Pinaceae | T | 84 | NA | NA |
| Cupressus goveniana ssp. goveniana | Gowen cypress | U.S.A. (CA) | Cupressaceae | T | 640 | NA | NA |
| Fitzroya cupressoides | Alerce or Chilean false larch | Chile, Argentina | ......do | T | 79 | NA | NA |
| Hesperocyparis abramsiana | Santa Cruz cypress | U.S.A. (CA) | ......do | T | 252 | NA | NA |
| Torreya taxifolia | Florida torreya | U.S.A. (FL, GA) | Taxaceae | E | 140 | NA | NA |
| Ferns and Allies | |||||||
| Adenophorus periens | Pendent kihi fern | U.S.A. (HI) | Grammitidaceae | E | 559 | 17.99(a)(1), (c), (e)(1), (i), and (k) | NA |
| Adiantum vivesii | None | U.S.A. (PR) | Adiantaceae | E | 504 | NA | NA |
| Asplenium dielerectum | Asplenium-leaved diellia | U.S.A. (HI) | Aspleniaceae | E | 559 | 17.99(a)(1), (c), (e)(1), (i), and (k) | NA |
| Asplenium dielfalcatum | None | ......do | ......do | E | 448 | 17.99(i) | NA |
| Asplenium dielmannii | ......do | ......do | ......do | E | 765 | 17.99(a) | NA |
| Asplenium dielpallidum | ......do | ......do | ......do | E | 530 | 17.99(a)(1) | NA |
| Asplenium peruvianum var. insulare | ......do | ......do | ......do | E | 553 | 17.99(e)(1) and (k) | NA |
| Asplenium scolopendrium var. americanum | American hart's-tongue fern | U.S.A. (AL, MI, NY, TN), Canada (Ont.) | ......do | T | 354 | NA | NA |
| Asplenium unisorum | None | U.S.A. (HI) | ......do | E | 541 | 17.99(i) | NA |
| Ctenitis squamigera | Pauoa | U.S.A. (HI) | ......do | E | 553 | 17.99(a)(1), (c), (e)(1), and (i) | NA |
| Cyathea dryopteroides | Elfin tree fern | U.S.A. (PR) | Cyatheaceae | E | 277 | NA | NA |
| Diellia erecta | Asplenium-leaved diellia | U.S.A (HI) | Aspleniaceae | E | 559 | 17.99(a)(1), (c), (e)(1), (i), and (k) | NA |
| Diplazium molokaiense | None | ......do | Woodsiaceae | E | 553 | 17.99(a)(1), (c), (e)(1), and (i) | NA |
| Doryopteris angelica | No common name | ......do | Pteridaceae | E | 765 | 17.99(a) | NA |
| Doryopteris takeuchii | None | ......do | ......do | E | 806 | 17.99(i) | NA |
| Dryopteris crinalis var. podosorus | Palapalai aumakua | ......do | Dryopteridaceae | E | 765 | 17.99(a) | NA |
| Elaphoglossum serpens | None | U.S.A. (PR) | Lomariopsidaceae | E | 504 | NA | NA |
| Huperzia mannii | Wawae‘iole | U.S.A. (HI) | Lycopodiaceae | E | 467 | 17.99(e)(1) | NA |
| Huperzia nutans | Wawaeiole | ......do | ......do | E | 467 | 17.99(e)(1) and (i) | NA |
| Isoetes louisianensis | Louisiana quillwort | U.S.A. (LA, MS) | Isoetaceae | E | 482 | NA | NA |
| Isoetes melanospora | Black-spored quillwort | U.S.A. (GA, SC) | ......do | E | 302 | NA | NA |
| Isoetes tegetiformans | Mat-forming quillwort | U.S.A. (GA) | ......do | E | 302 | NA | NA |
| Marsilea villosa | Ihi ihi | U.S.A. (HI) | Marsileaceae | E | 474 | 17.99(c) and (i) | NA |
| Polystichum aleuticum | Aleutian shield-fern | U.S.A. (AK) | Dryopteridaceae | E | 305 | NA | NA |
| Polystichum calderonense | None | U.S.A. (PR) | ......do | E | 504 | NA | NA |
| Pteris lidgatei | None | U.S.A. (HI) | Adiantaceae | E | 553 | 17.99(c), (e)(1), and (i) | NA |
| Tectaria estremerana | ......do | U.S.A. (PR) | Dryopteridaceae | E | 504 | NA | NA |
| Thelypteris inabonensis | ......do | ......do | Thelypteridaceae | E | 506 | NA | NA |
| Thelypteris pilosa var. alabamensis | Alabama streak-sorus fern | U.S.A. (AL) | ......do | T | 476 | NA | NA |
| Thelypteris verecunda | None | U.S.A. (PR) | ......do | E | 506 | NA | NA |
| Thelypteris yaucoensis | ......do | ......do | ......do | E | 506 | NA | NA |
| Trichomanes punctatum ssp. floridanum | Florida bristle fern | U.S.A. (FL) | Hymenophyllaceae | E | 859 | NA | NA |
| Lichens | |||||||
| Cladonia perforata | Florida perforate cladonia | U.S.A. (FL) | Cladoniaceae | E | 500 | NA | NA |
| Gymnoderma lineare | Rock gnome lichen | U.S.A. (NC,TN) | ......do | E | 572 | NA | NA |
Symbols used in the “when listed” column:
D - Indicates FR where species was Delisted; relisting of the species is indicated by subsequent number(s).
E - Indicates Emergency rule publication (see FR document for effective dates); subsequent number(s) indicate FR final rule, if applicable, under “When listed”.
1. For Federal Register citations affecting the table in § 17.12(h), see the listing above.
2. For Federal Register citations affecting § 17.12, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.fdsys.gov.