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Taxon author: Torr.

ITIS records citing taxon author "Torr."
 
 Kingdom Animalia
  Abietinaria traski (Torrey, 1902) -- valid
  Acalypta lillianis Torre-Bueno, 1916 -- valid
  Achillas Torre Bueno, 1914 -- valid
  Achillas bicaudatus Torre Bueno, 1914 -- valid
  Acuticephala Torres, 1958 -- valid
  Acuticephala alipuncta Torres, 1958 -- valid
  Acyroneura Torres, 1958 -- valid
  Acyroneura singularis Torres, 1958 -- valid
  Aenictus gibbosus Dalla Torre, 1893 -- valid
  Aenictus gibbosus gibbosus Dalla Torre, 1893 -- valid
  Aglaophenia diegensis Torrey, 1904 -- valid
  Aglaophenia inconspicua Torrey, 1904 -- valid
  Alarcta Torres, 1958 -- valid
  Alarcta albicerata (Torres, 1949) -- valid
  Alarcta bahiensis (Torres, 1942) -- valid
  Alarcta blanchardi (Torres, 1948) -- valid
  Alarcta macrogina (Torres, 1949) -- valid
  Alarcta minuta (Torres, 1949) -- valid
  Alarcta quadrimacula Torres, 1958 -- valid
  Alarcta terrosa Torres, 1958 -- valid
  Alyssontini Dalla Torre, 1897 -- valid
  Amegilla custos (Dalla Torre, 1896) -- valid
  Amegilla gallica (Dalla Torre & Friese, 1895) -- invalid
  Ammophila guerinii Dalla Torre, 1897 -- invalid
  Ammophila indica Dalla Torre, 1897 -- invalid
  Ammophila turcestanica Dalla Torre, 1897 -- invalid
  Ammophila walkeri Dalla Torre, 1897 -- invalid
  Andrena canadensis Dalla Torre, 1896 -- valid
  Andrena canadensis canadensis Dalla Torre, 1896 -- invalid
  Andrena gwynana testacea Dalla Torre, 1877 -- invalid
  Andrena interrogationis Dalla Torre, 1884 -- invalid
  Andrena lepeletieri Dalla Torre, 1896 -- invalid
  Andrena radoszkowski Dalla Torre, 1896 -- invalid
  Andrena radoszkowskii Dalla Torre, 1896 -- invalid
  Andrena robertsonii Dalla Torre, 1896 -- valid
  Anolis peruensis Poe, Latella, Ayala-Varela, Yańez-Miranda and Torres-Carvajal, 2015 -- valid
  Anolis podocarpus Ayala-Varela and Torres-Carvajal, 2010 -- valid
  Anolis poei Ayala-Varela, Troya-Rodriguez, Talero-Rodriguez and Torres-Carvajal, 2014 -- valid -- Telimbela Anole
  Antennella avalonia Torrey, 1902 -- valid
  Anthidium orizabae Dalla Torre, 1890 -- valid
  Anthodioctes indescriptus (Dalla Torre, 1890) -- valid
  Anthophora aegyptiaca (Dalla Torre & Friese, 1895) -- valid
  Anthophora angolensis (Dalla Torre, 1896) -- valid
  Anthophora eversmannii (Dalla Torre & Friese, 1895) -- valid
  Anthophora saropodoides (Dalla Torre, 1896) -- valid
  Anthrena americana Dalla Torre, 1896 -- invalid
  Anthrena clypeolata Dalla Torre, 1896 -- invalid
  Anthrena commixta Dalla Torre and Friese, 1895 -- invalid
  Anthrena meridionalis Dalla Torre and Friese, 1895 -- invalid
  Anthrena provancheri Dalla Torre, 1896 -- invalid
  Anthrena scutellata Dalla Torre, 1896 -- invalid
  Aphaenogaster gibbosa mauritanica Dalla Torre, 1893 -- valid
  Aphodius bistrigatus Dalla Torre, 1879 -- invalid
  Aphodius griseus Dalla Torre, 1879 -- invalid
  Aphodius lineatus Dalla Torre, 1879 -- invalid
  Aphodius melancholicus Dalla Torre, 1879 -- invalid
  Aphodius rufotestaceus Dalla Torre, 1879 -- invalid
  Aphodius thoracicus Dalla Torre, 1879 -- invalid
  Aphodius unicolor Dalla Torre, 1879 -- invalid
  Aprasia fusca Storr, 1979 -- valid
  Aprasia haroldi Storr, 1978 -- valid
  Aprasia smithi Storr, 1970 -- valid
  Arhyssus hirtus (Torre-Bueno, 1912) -- valid
  Atractus avernus Passos, Chiesse, Torres-Carvajal and Savage, 2009 -- valid
  Atractus savagei Salazar-Valenzuela, Torres-Carvajal and Passos, 2014 -- valid -- Savage's Groundsnake
  Belomicrus radoszkowskyi (Dalla Torre, 1897) -- valid
  Bimeria franciscana Torrey, 1902 -- valid
  Bimeria robusta Torrey, 1902 -- valid
  Bombus trinominatus Dalla Torre, 1890 -- valid
  Botruanthus benedeni (Torrey and Kleeburger, 1909) -- valid
  Bougainvillia glorietta Torrey, 1904 -- valid
  Brachyaspis atriceps Storr, 1980 -- invalid
  Brachyurophis incinctus (Storr, 1968) -- valid -- Unbanded Shovel-nosed Snake
  Bracon nitidulus Dalla Torre, 1883 -- valid
  Buenoa margaritacea Torre-Bueno, 1908 -- valid
  Calliopsida Torres, 1958 -- valid
  Campalecium Torrey, 1902 -- valid
  Campalecium medusiferum Torrey, 1902 -- valid
  Camponotus alii concolor Dalla Torre, 1893 -- valid
  Camponotus fasciatellus Dalla Torre, 1892 -- valid
  Camponotus fellah Dalla Torre, 1893 -- valid
  Camponotus hova hovoides Dalla Torre, 1893 -- valid
  Camponotus hova mixtellus Dalla Torre, 1893 -- valid
  Camponotus jaliensis Dalla Torre, 1893 -- valid
  Camponotus jaliensis jaliensis Dalla Torre, 1893 -- valid
  Camponotus maculatus sylvaticomaculatus Dalla Torre, 1893 -- valid
  Camponotus oertzeni andrius Dalla Torre, 1893 -- valid
  Camponotus oertzeni kappariensis Dalla Torre, 1893 -- valid
  Camponotus sanctaefidei Dalla Torre, 1892 -- valid
  Camponotus sanctaefidei sanctaefidei Dalla Torre, 1892 -- valid
  Camponotus variegatus dulcis Dalla Torre, 1893 -- valid
  Camponotus variegatus fuscithorax Dalla Torre, 1893 -- valid
  Carineta crassicauda Torres, 1948 -- valid
  Carineta limpida Torres, 1948 -- valid
  Carineta liturata Torres, 1948 -- valid
  Carineta maculosa Torres, 1948 -- valid
  Carineta propinqua Torres, 1948 -- valid
  Carineta scripta Torres, 1948 -- valid
  Ceracis thoracicus Dalla Torre, 1911 -- invalid
  Ceraphron tertius Dalla Torre, 1898 -- valid
  Ceraphron thomsoni Dalla Torre, 1890 -- valid
  Cerceris dichroa Dalla Torre, 1890 -- invalid
  Cerceris marginula Dalla Torre, 1897 -- valid
  Cerceris nevadensis Dalla Torre, 1890 -- invalid
  Cerceris provancheri Dalla Torre, 1890 -- invalid
  Cerceris rufinodula Dalla Torre, 1897 -- invalid
  Cerceris smithii Dalla Torre, 1897 -- invalid
  Cerion sculptum marielinum Torre, 1927 -- valid
  Cerrophidion petlalcalensis Lopéz-Luna, Vogt and Torre-Loranca, 1999 -- valid
  Charisea Torrey, 1902 -- valid
  Charisea saxicola Torrey, 1902 -- valid -- Alaskan anemone
  Chonosia atrodorsalis Torres, 1945 -- valid
  Chonosia trigonocelis Torres, 1945 -- valid
  Cis caseyi Dalla Torre, 1911 -- invalid
  Cis ephippium Dalla Torre, 1911 -- invalid
  Cis insulicola Dalla Torre, 1911 -- valid
  Cis krausi Dalla Torre, 1911 -- valid
  Cis levellei Dalla Torre, 1911 -- invalid
  Cis nubilus Dalla Torre, 1911 -- invalid
  Clytia bakeri Torrey, 1904 -- invalid
  Clytia hendersoni Torrey, 1904 -- valid
  Clytia hesperia (Torrey, 1904) -- valid
  Clytia lomae (Torrey, 1909) -- valid
  Clytia universitatis Torrey, 1904 -- valid
  Cnidopus ritteri (Torrey, 1902) -- invalid
  Cochranella erminea Torres-Gastello, Suárez-Segovia and Cisneros-Heredia, 2007 -- valid
  Coelioxys smithii Dalla Torre, 1896 -- valid
  Colletes petropolitanus Dalla Torre, 1897 -- valid
  Colletes robertsonii Dalla Torre, 1896 -- valid
  Corymorpha palma Torrey, 1902 -- valid -- fairy palm hydroid, fairypalm hydroid
  Corythaica bellula Torre-Bueno, 1917 -- valid
  Corythucha melissae Froeschner and Torres Miller, 2002 -- valid
  Crabro altigena Dalla Torre, 1897 -- valid
  Crabro bellulus (Dalla Torre, 1897) -- invalid
  Crabro canadensis Dalla Torre, 1897 -- invalid
  Crabro carbonicolor Dalla Torre, 1897 -- invalid
  Crabro interruptulus Dalla Torre, 1897 -- invalid
  Crabro rufitarsis Dalla Torre, 1897 -- invalid
  Crabro scutellifer Dalla Torre, 1897 -- invalid
  Crabro servus Dalla Torre, 1897 -- invalid
  Crabro verhoeffi Dalla Torre, 1897 -- invalid
  Crematogaster gerstaeckeri Dalla Torre, 1892 -- valid
  Crematogaster gerstaeckeri gerstaeckeri Dalla Torre, 1892 -- valid
  Crematogaster obscurior Dalla Torre, 1892 -- valid
  Crematogaster sewellii dentata Dalla Torre, 1893 -- valid
  Crossocerus scutellifer (Dalla Torre, 1897) -- invalid
  Cryptagama aurita (Storr, 1981) -- valid -- Gravel Dragon
  Ctenophorus butleri (Storr, 1977) -- invalid
  Ctenophorus butlerorum (Storr, 1977) -- valid
  Ctenophorus caudicinctus graafi (Storr, 1967) -- valid
  Ctenophorus caudicinctus infans (Storr, 1967) -- valid
  Ctenophorus caudicinctus macropus (Storr, 1967) -- valid
  Ctenophorus caudicinctus mensarum (Storr, 1967) -- valid
  Ctenophorus caudicinctus slateri (Storr, 1967) -- valid
  Ctenophorus chapmani (Storr, 1977) -- valid -- Bight Heath Dragon
  Ctenophorus clayi (Storr, 1967) -- valid -- Black-shouldered Ground-dragon
  Ctenophorus femoralis (Storr, 1965) -- valid -- Long-tailed Sand-dragon
  Ctenophorus fordi (Storr, 1965) -- valid -- Mallee Dragon, Mallee Sand-dragon
  Ctenophorus isolepis citrinus (Storr, 1965) -- valid
  Ctenophorus maculatus badius (Storr, 1965) -- valid
  Ctenophorus maculatus dualis (Storr, 1965) -- valid
  Ctenophorus maculatus griseus (Storr, 1965) -- valid
  Ctenophorus mckenziei (Storr, 1981) -- valid -- Dwarf Bicycle-dragon
  Ctenophorus parviceps (Storr, 1964) -- valid -- Gnaraloo Heath Dragon
  Ctenophorus rubens (Storr, 1965) -- valid -- Reddening Sand-dragon
  Ctenophorus salinarum (Storr, 1966) -- valid -- Saltpan Ground-dragon
  Ctenophorus yinnietharra (Storr, 1981) -- valid -- Yinnietharra Crevice-dragon
  Dasypoda rhododactyla Dalla Torre, 1881 -- invalid
  Delma butleri Storr, 1987 -- valid
  Demansia calodera Storr, 1978 -- valid -- Black-necked Whipsnake
  Demansia olivacea calodera Storr, 1978 -- invalid
  Demansia olivacea rufescens Storr, 1978 -- invalid
  Demansia papuensis melaena Storr, 1978 -- valid
  Demansia psammophis cupreiceps Storr, 1978 -- valid
  Demansia reticulata cupreiceps Storr, 1978 -- invalid
  Demansia rufescens Storr, 1978 -- valid -- Rufous Whipsnake
  Demansia simplex Storr, 1978 -- valid -- Grey Whipsnake
  Denisonia monachus Storr, 1964 -- invalid
  Denisonia ordensis Storr, 1984 -- invalid
  Denisonia spectabilis nullarbor Storr, 1981 -- invalid
  Derephysia josefa Baena and Torres, 2009 -- valid
  Derotettix proseni Torres, 1945 -- valid
  Dianthidium cressonii (Dalla Torre, 1896) -- valid
  Diplocheilus allmani Torrey, 1904 -- invalid
  Diplodactylus fulleri Storr, 1978 -- valid
  Diplodactylus granariensis Storr, 1979 -- valid
  Diplodactylus kenneallyi Storr, 1988 -- valid
  Diporiphora albilabris Storr, 1974 -- valid -- Tar Tar Lizard, White-lipped Two-line Dragon
  Diporiphora albilabris albilabris Storr, 1974 -- valid
  Diporiphora albilabris sobria Storr, 1974 -- valid
  Diporiphora arnhemica Storr, 1974 -- valid -- Arnhem Land Two-line Dragon
  Diporiphora convergens Storr, 1974 -- valid -- Crystal Creek Two-line Dragon
  Diporiphora lalliae Storr, 1974 -- valid -- Lally's Two-line Dragon
  Diporiphora magna Storr, 1974 -- valid -- Yellow-sided Two-line Dragon
  Diporiphora margaretae Storr, 1974 -- valid
  Diporiphora pindan Storr, 1980 -- valid -- Pindan Dragon, Pindan Two-line Dragon
  Diporiphora superba Storr, 1974 -- valid -- Superb Two-line Dragon
  Diporiphora valens Storr, 1980 -- valid -- Pilbara Two-line Dragon, Southern Pilbara Spinifex Dragon, Southern Pilbara Tree Dragon
  Disholcaspis Dalla Torre & Kieffer, 1910 -- valid
  Echiopsis atriceps (Storr, 1980) -- invalid
  Ectemnius continuus rufitarsis (Dalla Torre, 1897) -- valid
  Ectopleura marina (Torrey, 1902) -- valid
  Eirene mollis (Torrey, 1909) -- valid
  Elachysoma Torres, 1964 -- valid
  Elachysoma quadrivittata Torres, 1964 -- valid
  Elassoneura Torres, 1964 -- valid
  Elassoneura carychrous Torres, 1964 -- valid
  Encopognathus bellulus (Dalla Torre, 1897) -- valid
  Endasys monticola (Dalla Torre, 1902) -- valid
  Enicocerus melanescens (Dalla Torre, 1877) -- invalid
  Entomosericini Dalla Torre, 1897 -- valid
  Enyalioides altotambo Torres-Carvajal, Venegas and de Queiroz, 2015 -- valid -- Alto Tambo Woodlizard
  Enyalioides anisolepis Torres-Carvajal, Venegas and de Queiroz, 2015 -- valid -- Rough-scaled Woodlizard
  Enyalioides azulae Venegas, Torres-Carvajal, Duran and de Queiroz, 2013 -- valid
  Enyalioides binzayedi Venegas, Torres-Carvajal, Duran and de Queiroz, 2013 -- valid
  Enyalioides rubrigularis Torres-Carvajal, de Queiroz and Etheridge, 2009 -- valid -- Red-throated Woodlizard
  Enyalioides sophiarothschildae Torres-Carvajal, Venegas and de Queiroz, 2015 -- valid -- Rothschild's Woodlizard
  Enyalioides touzeti Torres-Carvajal, Almendáriz, Valencia, Yúnez-Muńos and Reyes, 2008 -- valid -- Touzet's Woodlizard
  Epiactis ritteri Torrey, 1902 -- valid -- sandy anemone
  Eucera algeriensis Dalla Torre, 1896 -- valid
  Eucera carolinensis Dalla Torre, 1896 -- valid
  Eucera commixta Dalla Torre & Friese, 1895 -- valid
  Eucera doursana Dalla Torre & Friese, 1894 -- valid
  Eucera fedtschenkoi Dalla Torre, 1896 -- valid
  Eucera syriaca Dalla Torre, 1896 -- valid
  Eucera zeta Dalla Torre, 1896 -- valid
  Eucerceris nevadensis (Dalla Torre, 1890) -- valid
  Eucerceris nevadensis nevadensis (Dalla Torre, 1890) -- valid
  Eucerceris provancheri (Dalla Torre, 1890) -- valid
  Eucerceris superba dichroa (Dalla Torre, 1890) -- invalid
  Eucheilota bakeri (Torrey, 1909) -- valid
  Eudendrium californicum Torrey, 1902 -- valid -- California stickhydroid, california stickyhydroid
  Eulaema chocoana Ospina-Torres & Sandino-Franco, 1997 -- valid
  Eulaema sororia Dressler & Ospina-Torres, 1997 -- valid
  Eupsophus queulensis Veloso, Celis-Diez, Guerrero, Méndez-Torres, Iturra-C. and Simonetti, 2005 -- valid
  Eupsophus septentrionalis Ibarra-Vidal, Ortiz and Torres-Pérez, 2004 -- valid
  Eurylochus Torre Bueno, 1914 -- invalid
  Eurylochus bellator Torre Bueno, 1914 -- invalid
  Eutimalphes brownei Torrey, 1909 -- valid
  Exeirina Dalla Torre, 1897 -- valid
  Friesea Dalla Torre, 1895 -- valid
  Gaesochira obscurior (Dalla Torre, 1896) -- valid
  Garveia franciscana (Torrey, 1902) -- valid
  Garveia robusta (Torrey, 1902) -- valid
  Gehyra montium Storr, 1982 -- valid
  Gehyra nana Storr, 1978 -- valid
  Gehyra purpurascens Storr, 1982 -- valid
  Gehyra xenopus Storr, 1978 -- valid
  Gonothyraea clarki Torrey, 1902 -- invalid
  Gopherus evgoodei Edwards, Karl, Vaughn, Rosen, Meléndez Torres and Murphy, 2016 -- valid -- Goode's Thornscrub Tortoise
  Grammonus claudei (de la Torre y Huerta, 1930) -- valid -- brótula parda, reef-cave brotula
  Guaranisaria bicolor Torres, 1958 -- valid
  Guaranisaria llanoi Torres, 1964 -- valid
  Gypaetus Storr, 1784 -- valid
  Habropoda cressonii (Dalla Torre, 1896) -- valid
  Habropoda radoszkowskii (Dalla Torre, 1896) -- valid
  Halecium annulatum Torrey, 1902 -- valid
  Halecium kofoidi Torrey, 1902 -- valid
  Halictus determinandus Dalla Torre, 1896 -- valid
  Halictus monochromus Dalla Torre, 1896 -- valid
  Halictus secundus Dalla Torre, 1896 -- valid
  Harenactis Torrey, 1902 -- valid
  Harenactis attenuata Torrey, 1902 -- valid -- giant burrowing anemone
  Heterocampa zayasi (Torre and Alayo, 1959) -- valid
  Heteronotia planiceps Storr, 1989 -- valid
  Hoplia lecontei Dalla Torre, 1913 -- invalid
  Hoplitis turcestanica (Dalla Torre, 1896) -- invalid
  Hormiphora californensis (Torrey, 1904) -- valid
  Hyalymenus notatus Torre-Bueno, 1939 -- valid
  Hyalymenus potens Torre-Bueno, 1939 -- valid
  Hydractinia californica Torrey, 1904 -- valid
  Hydractinia milleri Torrey, 1902 -- valid -- Miller hydractinia, miller hydractinia
  Hydraena melas Dalla Torre, 1877 -- valid
  Hydrometra australis Torre-Bueno, 1926 -- invalid
  Hydrometra championiana Torre-Bueno, 1926 -- invalid
  Hydrometra comata Torre-Bueno, 1926 -- valid
  Hydrometra cordubense Torre-Bueno, 1926 -- invalid
  Hydrometra cyprina Torre-Bueno, 1926 -- valid
  Hydrometra exilis Torre-Bueno, 1926 -- valid
  Hydrometra gibara Torre-Bueno, 1926 -- valid
  Hydrometra hungerfordi Torre-Bueno, 1926 -- valid
  Hydrometra husseyi Torre-Bueno, 1926 -- invalid
  Hydrometra kirkaldyana Torre-Bueno, 1926 -- invalid
  Hydrometra lillianis Torre-Bueno, 1926 -- valid
  Hydrometra longicapitis Torre-Bueno, 1927 -- valid
  Hydrometra myrae Torre-Bueno, 1926 -- invalid
  Hydrometra priscillae Torre-Bueno, 1926 -- valid
  Hylaeus asiaticus (Dalla Torre, 1896) -- valid
  Hylobius congener Dalla Torre et al., 1943 -- valid
  Ibalia arcuata Dalla Torre and Kieffer, 1910 -- invalid
  Imantodes chocoensis Torres-Carvajal, Yánez-Muńoz, Quirola, Smith and Almendáriz, 2012 -- valid -- Chocoan Blunt-headed Vine Snake
  Junkia Dalla Torre, 1913 -- invalid
  Larra carbunculus Dalla Torre, 1897 -- invalid
  Larra ganahlii Dalla Torre, 1897 -- invalid
  Larra nigricolor Dalla Torre, 1897 -- invalid
  Larra nigripennata Dalla Torre, 1897 -- invalid
  Larra obscurior Dalla Torre, 1894 -- valid
  Larra politica Dalla Torre, 1897 -- invalid
  Larra tisiphonoides Dalla Torre, 1897 -- invalid
  Larra truncatula Dalla Torre, 1897 -- invalid
  Lasioglossum alpigenum (Dalla Torre, 1877) -- valid
  Lasioglossum cephalotes (Dalla Torre, 1896) -- valid
  Lasioglossum chinense (Dalla Torre, 1896) -- valid
  Lasioglossum duplex (Dalla Torre, 1896) -- valid
  Lasioglossum japonicum (Dalla Torre, 1896) -- valid
  Lasioglossum leucopymatum (Dalla Torre, 1896) -- valid
  Lasioglossum melanopus (Dalla Torre, 1896) -- valid
  Lasioglossum smithii (Dalla Torre, 1896) -- invalid
  Lasioglossum tertium (Dalla Torre, 1896) -- valid
  Leioproctus australiensis (Dalla Torre, 1896) -- valid
  Leioproctus rubiginosus (Dalla Torre, 1896) -- valid
  Lepisiota nigra (Dalla Torre, 1893) -- valid
  Leptothorax interruptus nitidiceps Dalla Torre, 1893 -- valid
  Limnogonus fossarum skusei (Torre-Bueno, 1926) -- valid
  Lipotriches armatula (Dalla Torre, 1896) -- valid
  Lipotriches negligenda (Dalla Torre, 1896) -- valid
  Liris ganahlii (Dalla Torre, 1897) -- valid
  Liris politica (Dalla Torre, 1897) -- invalid
  Liris politicus (Dalla Torre, 1897) -- valid
  Lucasium immaculatum Storr, 1988 -- valid
  Lucasium wombeyi Storr, 1978 -- valid
  Maphaea Dalla Torre, 1911 -- invalid
  Mecopeltus congenitalis Dalla Torre and Hustche, 1930 -- invalid
  Megachile australasiae Dalla Torre, 1896 -- valid
  Megachile binotulata Dalla Torre, 1896 -- valid
  Megachile brasiliensis Dalla Torre, 1896 -- valid
  Megachile buddhae Dalla Torre, 1896 -- valid
  Megachile macularis Dalla Torre, 1896 -- valid
  Megachile modestissima Dalla Torre, 1896 -- valid
  Megachile mortyana Dalla Torre, 1896 -- valid
  Megachile pereziana Dalla Torre, 1896 -- valid
  Megachile tertia Dalla Torre, 1896 -- valid
  Megachile walkeri Dalla Torre, 1896 -- valid
  Megommation festivagum (Dalla Torre, 1896) -- valid
  Mellivora Storr, 1780 -- valid
  Mesoleptus davisii (Dalla Torre, 1898) -- valid
  Metrobates trux (Torre-Bueno, 1921) -- valid
  Metrobates trux trux (Torre-Bueno, 1921) -- valid
  Microvelia (Kirkaldya) Torre-Bueno, 1910 -- valid
  Microvelia albolineolata Torre-Bueno, 1927 -- invalid
  Microvelia albolineolata Torre-Bueno, 1927 -- valid
  Microvelia atrata Torre-Bueno, 1916 -- valid
  Microvelia austrina Torre-Bueno, 1924 -- valid
  Microvelia borealis Torre-Bueno, 1916 -- invalid
  Microvelia borealis Torre-Bueno, 1916 -- invalid
  Microvelia fontinalis Torre-Bueno, 1916 -- valid
  Microvelia longicornis Torre-Bueno, 1925 -- valid
  Microvelia longicornis Torre-Bueno, 1925 -- invalid
  Microvelia villosula Torre-Bueno, 1927 -- valid
  Microvelia villosula Torre-Bueno, 1927 -- invalid
  Mimesa montivaga Dalla Torre, 1897 -- invalid
  Mitrocoma discoidea Torrey, 1909 -- valid
  Mitrocomium medusiferum Torrey, 1902 -- valid
  Mustela felipei Izor and de la Torre, 1978 -- valid -- Colombian Weasel, Don Felipe's Weasel
  Nasua Storr, 1780 -- valid -- coatis
  Neocorynura claviventris (Dalla Torre, 1896) -- valid
  Nephrurus stellatus Storr, 1968 -- valid
  Nephrurus vertebralis Storr, 1963 -- valid
  Nitidula bicolor Dalla Torre, 1879 -- invalid
  Nitidula marginata Dalla Torre, 1879 -- invalid
  Nomada erythraea Dalla Torre, 1896 -- valid
  Nomada hungarica Dalla Torre & Friese, 1894 -- valid
  Nomada integerrima Dalla Torre, 1896 -- valid
  Nomada italica Dalla Torre & Friese, 1894 -- valid
  Nomada siciliensis Dalla Torre & Friese, 1894 -- valid
  Nomia foxii Dalla Torre, 1896 -- valid
  Nomia punctulata Dalla Torre, 1896 -- valid
  Notonecta howardii Torre-Bueno, 1905 -- invalid
  Notonecta raleighi Torre-Bueno, 1907 -- valid
  Obelia corona Torrey, 1904 -- invalid
  Ochthebius flavipes Dalla Torre, 1877 -- valid
  Ochthebius melanescens (Dalla Torre, 1877) -- valid
  Oligopus claudei (de la Torre y Huerta, 1930) -- invalid -- reef-cave brotula
  Oncopeltus cayensis Torre-Bueno, 1944 -- valid
  Opisthopsis Dalla Torre, 1893 -- valid
  Opius provancheri Dalla Torre, 1886 -- valid
  Oxybelus bellulus Dalla Torre, 1897 -- invalid
  Oxybelus packardi Dalla Torre, 1890 -- invalid
  Oxybelus radoszkowskyi Dalla Torre, 1897 -- invalid
  Pachycerianthus aestuarii (Torrey and Kleeburger, 1909) -- valid
  Pachycerianthus johnsoni (Torrey and Kleeburger, 1909) -- valid
  Pachycondyla castaneicolor (Dalla Torre, 1893) -- valid
  Pachypsaltria cirrha Torres, 1960 -- valid
  Pachypsaltria haematodes Torres, 1960 -- valid
  Pachypsaltria monrosi Torres, 1960 -- valid
  Pachypsaltria peristicta Torres, 1960 -- valid
  Pachypsaltria phaedima Torres, 1960 -- valid
  Palaeorhiza elegantissima (Dalla Torre, 1896) -- valid
  Panurgus calcaratus nigricornis Dalla Torre, 1877 -- invalid
  Parasuta monachus (Storr, 1964) -- valid -- Hooded Snake, Monk Snake
  Parasuta spectabilis bushi (Storr, 1988) -- valid
  Parasuta spectabilis nullarbor (Storr, 1981) -- valid
  Paroplocephalus atriceps (Storr, 1980) -- valid -- Lake Cronin Snake
  Patellapis reticulosa (Dalla Torre, 1896) -- valid
  Pelocoris carolinensis Torre-Bueno, 1907 -- valid
  Pemphredon cressoni Dalla Torre, 1897 -- invalid
  Pemphredon provancheri Dalla Torre, 1897 -- invalid
  Peromyscus difficilis petricola Hoffmeister and de la Torre, 1959 -- invalid
  Peromyscus difficilis saxicola Hoffmeister and de la Torre, 1959 -- invalid
  Phalanger Storr, 1780 -- valid -- cuscuses
  Pheidole radoszkowskii pugnax Dalla Torre, 1892 -- valid
  Phialidium lomae Torrey, 1909 -- invalid
  Phialium bakeri Torrey, 1909 -- invalid
  Phialopsis Torrey, 1909 -- valid
  Phialopsis diegensis Torrey, 1909 -- valid
  Phialucium comata Torrey, 1909 -- invalid
  Philanthus elegantissimus Dalla Torre, 1897 -- valid
  Philanthus mendozae Dalla Torre, 1897 -- invalid
  Philanthus politus pulcher Dalla Torre, 1897 -- invalid
  Philanthus pulcher Dalla Torre, 1897 -- valid
  Phoronis pacifica Torrey, 1901 -- invalid
  Phygadeuon monticola Dalla Torre, 1902 -- invalid
  Plumularia alicia Torrey, 1902 -- invalid
  Pnirontis perpugnax (Torre Bueno, 1914) -- valid
  Podagritus carbonicolor (Dalla Torre, 1897) -- valid
  Podalonia turcestanica (Dalla Torre, 1897) -- valid
  Podium tau (Dalla Torre, 1897) -- valid
  Pogona Storr, 1982 -- valid
  Prasinosoma Torres, 1963 -- valid
  Prasinosoma fuembuenai Torres, 1963 -- valid
  Pristimantis tantanti (Lehr, Torres-Gastello and Suárez-Segovia, 2007) -- valid
  Procavia Storr, 1780 -- valid
  Procebus Storr, 1780 -- invalid
  Procyon Storr, 1780 -- valid -- raccoons
  Proisotoma macgillivaryi (Della Torre, 1895) -- valid
  Proisotoma schoetti (Dalla Torre, 1895) -- valid
  Protosmia sicula (Dalla Torre & Friese, 1895) -- valid
  Psen montivagus (Dalla Torre, 1897) -- valid
  Pseneo montivagus (Dalla Torre, 1897) -- invalid
  Psephenotettix Torres, 1958 -- valid
  Psephenotettix grandis Torres, 1958 -- valid
  Psephenotettix minor Torres, 1958 -- valid
  Pseudacratus Dalla Torre, 1912 -- invalid
  Pseudoceros astrorum Bulnes and Torres, 2014 -- valid
  Pseudomyrmex elongatulus (Dalla Torre, 1892) -- valid
  Pseudomyrmex elongatulus elongatulus (Dalla Torre, 1892) -- valid
  Pseudomyrmex monochrous (Dalla Torre, 1892) -- valid
  Pseudonaja affinis exilis Storr, 1989 -- valid
  Pseudosaldula paralia (Torres, 1954) -- invalid
  Ptychogena californica Torrey, 1909 -- valid
  Pycnotheca allmani (Torrey, 1904) -- valid
  Ramphotyphlops centralis Storr, 1984 -- valid
  Ramphotyphlops hamatus Storr, 1981 -- valid
  Ramphotyphlops howi Storr, 1983 -- valid
  Ramphotyphlops kimberleyensis Storr, 1981 -- valid
  Ramphotyphlops margaretae Storr, 1981 -- valid
  Ramphotyphlops micromma Storr, 1981 -- valid
  Ramphotyphlops troglodytes Storr, 1981 -- valid
  Ramphotyphlops yampiensis Storr, 1981 -- valid
  Ranatra kirkaldyi Torre-Bueno, 1905 -- valid
  Ranatra kirkaldyi kirkaldyi Torre-Bueno, 1905 -- valid
  Rhagovelia arctoa Torre-Bueno, 1924 -- invalid
  Rhagovelia arctoa Torre-Bueno, 1924 -- invalid
  Rhagovelia flavicincta Torre-Bueno, 1924 -- invalid
  Rhagovelia flavicincta Torre-Bueno, 1924 -- invalid
  Rhagovelia obesa flavicincta Torre-Bueno, 1924 -- invalid
  Rhagovelia rivale Torre-Bueno, 1924 -- valid
  Rheumatobates praeposterus Bergroth in Torre-Bueno, 1908 -- valid
  Rhinoplocephalus spectabilis bushi Storr, 1988 -- invalid
  Rhopalum carbonicolor (Dalla Torre, 1897) -- invalid
  Rutuba Torre Bueno, 1914 -- invalid
  Rutuba perpugnax Torre Bueno, 1914 -- invalid
  Salacia desmoides (Torrey, 1902) -- invalid
  Scaptotrigona pectoralis (Dalla Torre, 1896) -- valid
  Sceliphron mocsaryi Dalla Torre, 1897 -- invalid
  Sceliphron ritsemae Dalla Torre, 1897 -- invalid
  Sceliphron spirifex aegyptiacum Dalla Torre, 1897 -- invalid
  Sceliphron tau Dalla Torre, 1897 -- invalid
  Sceliphron vicinum Dalla Torre, 1897 -- invalid
  Sceliphron violascens Dalla Torre, 1897 -- invalid
  Scrippsia Torrey, 1909 -- valid
  Scrippsia pacifica Torrey, 1909 -- valid
  Sertularella pedrensis Torrey, 1904 -- valid
  Sertularia desmoides Torrey, 1902 -- valid
  Simoselaps incinctus (Storr, 1968) -- invalid
  Simoselaps littoralis (Storr, 1968) -- valid -- Coastal Burrowing Snake, West-Coast Banded Snake
  Sphex gratiosissimus Dalla Torre, 1897 -- invalid
  Sphex guerinii (Dalla Torre, 1897) -- invalid
  Spongia sterea de Laubenfels and Storr -- valid -- wire sponge
  Stenocercus angel Torres-Carvajal, 2000 -- valid
  Stenocercus cadlei Torres-Carvajal and Mafla-Endara, 2013 -- valid
  Stenocercus chota Torres-Carvajal, 2000 -- valid
  Stenocercus frittsi Torres-Carvajal, 2005 -- valid
  Stenocercus puyango Torres-Carvajal, 2005 -- valid
  Stenocercus santander Torres-Carvajal, 2007 -- valid
  Stenocercus sinesaccus Torres-Carvajal, 2005 -- valid
  Strophurus assimilis (Storr, 1988) -- valid
  Strophurus jeanae (Storr, 1988) -- valid
  Strophurus mcmillani (Storr, 1978) -- valid
  Strophurus rankini (Storr, 1979) -- valid
  Strophurus wellingtonae (Storr, 1988) -- valid
  Strophurus wilsoni (Storr, 1983) -- valid
  Sturnira angeli de la Torre, 1966 -- valid
  Sturnira lilium angeli de la Torre, 1966 -- invalid
  Sturnira lilium paulsoni de la Torre, 1966 -- invalid
  Sturnira magna de la Torre, 1966 -- valid -- greater yellow-shouldered bat, Greater Yellow-shouldered Bat
  Sturnira paulsoni de la Torre, 1966 -- valid
  Sturnira thomasi de la Torre and Schwartz, 1966 -- valid -- Thomas's yellow-shouldered bat, Thomas's Yellow-shouldered Bat
  Sturnira tildae de la Torre, 1959 -- valid -- Tilda yellow-shouldered bat, Tilda's Yellow-shouldered Bat
  Suta monachus (Storr, 1964) -- invalid
  Suta ordensis (Storr, 1984) -- valid -- Ord Curl Snake
  Suta spectabilis bushi (Storr, 1988) -- invalid
  Suta spectabilis nullarbor (Storr, 1981) -- invalid
  Svastra cressonii (Dalla Torre, 1896) -- valid
  Symplectoscyphus pedrensis (Torrey, 1904) -- valid
  Synopeas ashmeadii Dalla Torre, 1898 -- valid
  Synophis bogerti Torres-Carvajal, Echevarría, Venegas, Chávez and Camper, 2015 -- valid -- Bogert's Shadow Snake
  Synophis insulomontanus Torres-Carvajal, Echevarría, Venegas, Chávez and Camper, 2015 -- valid -- Mountain Shadow Snake
  Synophis niceforomariae Pyron, Arteaga, Echevarría and Torres-Carvajal, 2016 -- valid -- Nicéforo María's Shadow Snake
  Synophis zaheri Pyron, Arteaga, Echevarría and Torres-Carvajal, 2016 -- valid -- Zaher's Shadow Snake
  Synophis zamora Torres-Carvajal, Echevarría, Venegas, Chávez and Camper, 2015 -- valid -- Zamoran Shadow Snake
  Tachysphex dubiosus Dalla Torre, 1897 -- invalid
  Tachysphex erythrophorus Dalla Torre, 1897 -- valid
  Tachysphex nigricolor (Dalla Torre, 1897) -- valid
  Tachysphex nigricolor nigricolor (Dalla Torre, 1897) -- valid
  Tachysphex tarsalis Dalla Torre, 1897 -- invalid
  Tachytes argenticrus Dalla Torre, 1897 -- invalid
  Tachytes holmbergii Dalla Torre, 1897 -- invalid
  Tachytes indicus Dalla Torre, 1897 -- valid
  Tachytes monticola Dalla Torre, 1897 -- invalid
  Tachytes tarsalis (Dalla Torre, 1897) -- invalid
  Tachytes vischu Dalla Torre, 1897 -- invalid
  Tarsius Storr, 1780 -- valid
  Telmatometra Bergroth in Torre-Bueno, 1908 -- valid
  Telmatometra whitei Bergroth in Torre-Bueno, 1908 -- valid
  Tetralonia commixta (Dalla Torre & Friese, 1895) -- invalid
  Tettigades albicerata Torres, 1949 -- invalid
  Tettigades angularis Torres, 1958 -- valid
  Tettigades auropilosa Torres, 1944 -- valid
  Tettigades bahiensis Torres, 1942 -- invalid
  Tettigades blanchardi Torres, 1948 -- invalid
  Tettigades bosqi Torres, 1942 -- valid
  Tettigades brevicauda Torres, 1958 -- valid
  Tettigades brevivenosa Torres, 1942 -- invalid
  Tettigades crassa Torres, 1958 -- valid
  Tettigades curvicosta Torres, 1958 -- valid
  Tettigades distanti Torres, 1958 -- valid
  Tettigades lacertosa Torres, 1944 -- valid
  Tettigades limbata Torres, 1958 -- valid
  Tettigades lizeri Torres, 1942 -- valid
  Tettigades macrogina Torres, 1949 -- invalid
  Tettigades major Torres, 1944 -- valid
  Tettigades minuta Torres, 1949 -- invalid
  Tettigades pauxilla Torres, 1958 -- valid
  Tettigades procera Torres, 1958 -- valid
  Tettigades sarcinatrix Torres, 1944 -- valid
  Tettigades sordida Torres, 1944 -- valid
  Tettigades undata Torres, 1958 -- valid
  Tettigades unipuncta Torres, 1958 -- valid
  Tettigotoma Torres, 1942 -- valid
  Tettigotoma maculata Torres, 1942 -- valid
  Thuiaria desmoides (Torrey, 1902) -- valid
  Thyreus smithii (Dalla Torre, 1896) -- valid
  Tiaropsidium Torrey, 1909 -- valid
  Tiaropsidium kelsei Torrey, 1909 -- valid
  Tiaropsidium kelseyi Torrey, 1909 -- valid
  Tollius vanduzeei Torre-Bueno, 1940 -- valid
  Trichocorixa naias (Kirkaldy and Torre-Bueno, 1909) -- invalid
  Trigonopsis vicina (Dalla Torre, 1897) -- valid
  Trigonopsis violascens (Dalla Torre, 1897) -- valid
  Trypoxylon cameronii Dalla Torre, 1897 -- valid
  Trypoxylon rugiceps Dalla Torre, 1897 -- valid
  Tubularia marina Torrey, 1902 -- invalid
  Tympanocryptis houstoni Storr, 1982 -- valid -- Houston's Earless Dragon
  Tympanocryptis lineata macra Storr, 1982 -- valid
  Valgus rufosquamatus Dalla Torre, 1879 -- invalid
  Varanus kingorum Storr, 1980 -- valid
  Varanus panoptes Storr, 1980 -- valid
  Varanus pilbarensis Storr, 1980 -- valid
  Vermicella annulata snelli Storr, 1968 -- invalid
  Vermicella bertholdi littoralis Storr, 1968 -- invalid
  Vermicella semifasciata incincta Storr, 1968 -- invalid
  Vermicella snelli Storr, 1968 -- valid
  Veseris bellator (Torre Bueno, 1914) -- valid
 
 Kingdom Plantae
  Abies douglassii var. macrocarpa Torr. -- not accepted
  Abies douglassii var. macrocarpum Torr. -- not accepted
  Abronia micrantha Torr. -- not accepted
  Abronia turbinata Torr. ex S. Watson -- accepted -- transmontane sand verbena
  Abutilon hulseanum (Torr. & A. Gray) Torr. ex A. Gray -- accepted -- mauve
  Abutilon texense Torr. & A. Gray -- not accepted
  Acacia angustissima var. texensis (Torr. & A. Gray) Isely -- accepted -- prairie wattle, whiteball acacia
  Acacia schottii Torr. -- not accepted -- Schott's acacia, Schott's wattle
  Acacia texensis Torr. & A. Gray -- not accepted
  Acalypha hederacea Torr. -- not accepted
  Acalypha radians Torr. -- accepted -- cardinal's feather
  Acanthochiton Torr. -- not accepted
  Acanthochiton Torr. -- not accepted
  Acanthochiton wrightii Torr. -- not accepted
  Acanthogonum corrugatum Torr. -- not accepted
  Acanthogonum polygonoides (Torr. & A. Gray) Goodman -- not accepted
  Acanthogonum rigidum Torr. -- not accepted
  Acer californica (Torr. & A. Gray) Wesm. -- not accepted
  Acer californicum (Torr. & A. Gray) D. Dietr. -- not accepted
  Acer glabrum Torr. -- accepted -- California mountain maple, Douglas' maple, dwarf maple, mountain maple, New Mexico maple, Rocky Mountain maple, Sierra maple
  Acer glabrum var. glabrum Torr. -- accepted -- Rocky Mountain maple
  Acer glabrum var. tripartitum (Nutt. ex Torr. & A. Gray) Pax -- not accepted
  Acer negundo ssp. californicum (Torr. & A. Gray) Wesm. -- not accepted
  Acer negundo var. californicum (Torr. & A. Gray) Sarg. -- accepted -- box elder, California boxelder
  Acer rubrum var. trilobum Torr. & A. Gray ex K. Koch -- accepted -- red maple
  Acer tripartitum Nutt. ex Torr. & A. Gray -- not accepted
  Acerates auriculata Engelm. ex Torr. -- not accepted
  Achillea millefolium var. rosea (Desf.) Torr. & A. Gray -- not accepted
  Achyronychia Torr. & A. Gray -- accepted
  Achyronychia cooperi Torr. & A. Gray -- accepted -- Cooper's frostmat, onyxflower
  Acleisanthes angustifolia (Torr.) R.A. Levin -- accepted -- narrowleaf moonpod
  Acleisanthes parvifolia (Torr.) R.A. Levin -- accepted -- littleleaf moonpod
  Actaea spicata var. arguta (Nutt.) Torr. -- not accepted
  Actinea grandiflora (Torr. & A. Gray ex A. Gray) Kuntze -- not accepted
  Actinospermum angustifolium (Pursh) Torr. & A. Gray -- not accepted
  Acuan leptolobum (Torr. & A. Gray) Kuntze -- not accepted
  Adenostoma sparsifolium Torr. -- accepted -- red shank, redshank
  Adhatoda longiflora Torr. -- not accepted
  Agalinis grandiflora var. serrata (Torr. ex Benth.) S.F. Blake -- not accepted
  Agave lecheguilla Torr. -- accepted -- lecheguilla
  Agave lechuguilla Torr. -- not accepted -- lecheguilla, lechuguilla, Maguey lechuguilla
  Agave maculata Engelm. ex Torr., non Regel -- not accepted
  Agave parviflora Torr. -- accepted -- Maguey sóbari, smallflower agave, smallflower century plant
  Agave parviflora ssp. parviflora Torr. -- accepted -- Santa Cruz striped agave, smallflower century plant
  Agnorhiza ovata (Torr. & A. Gray ex Torr.) W.A. Weber -- accepted -- southern mule-ears
  Agoseris glauca var. dasycephala (Torr. & A. Gray) Jeps. -- accepted -- pale agoseris, pale goat-chicory
  Agraulus brevifolius Nees ex Torr. -- not accepted
  Agrimonia eupatoria var. mollis Torr. & A. Gray -- not accepted
  Agrimonia incisa Torr. & A. Gray -- accepted -- incised agrimony, incised groovebur
  Agrimonia mollis (Torr. & A. Gray) Britton -- not accepted
  Agrostis airoides Torr. -- not accepted
  Agrostis ampla f. monolepis (Torr.) Beetle -- not accepted
  Agrostis caespitosa Torr. -- not accepted
  Agrostis canina var. tenella Torr. -- not accepted
  Agrostis compressa Torr. -- not accepted
  Agrostis cryptandra Torr. -- not accepted
  Agrostis drummondii Torr. ex Hook. f. -- not accepted
  Agrostis exarata var. monolepis (Torr.) Hitchc. -- not accepted -- monolepis bentgrass
  Agrostis lateriflora var. filiformis Torr. -- not accepted
  Agrostis laxiflora var. caespitosa Torr. -- not accepted
  Agrostis laxiflora var. montana (Torr.) Tuck. -- not accepted
  Agrostis laxiflora var. scabra (Willd.) Torr. -- not accepted
  Agrostis laxiflora var. tenuis (Tuck.) Torr. -- not accepted
  Agrostis longifolia Torr. -- not accepted
  Agrostis scabra var. montana (Torr.) Fernald -- not accepted
  Agrostis serotina Torr. -- not accepted
  Agrostis sylvatica Torr. -- not accepted
  Aira aristulata Torr. -- not accepted
  Aldenella tenuifolia (Torr. & A. Gray) Greene -- not accepted
  Alectoroctonum wrightii (Torr. & A. Gray) Klotzsch & Garcke -- not accepted
  Aletes acaulis (Torr.) J.M. Coult. & Rose -- accepted -- stemless Indian parsley
  Aletes tenuifolius (Nutt. ex Torr. & A. Gray) W.A. Weber -- not accepted
  Aliciella subnuda (Torr. ex A. Gray) J.M. Porter -- accepted -- coral gilia
  Alisma geyeri Torr. -- not accepted
  Alisma gramineum var. geyeri (Torr.) Sam. -- not accepted
  Alisma plantago-aquatica var. parviflorum (Pursh) Torr. -- not accepted
  Allium amplectens Torr. -- accepted -- narrowleaf onion
  Allium croceum Torr. -- not accepted
  Allium tribracteatum Torr. -- accepted -- threebract onion
  Allotropa Torr. & A. Gray ex A. Gray -- accepted -- sugar stick, sugarstick
  Allotropa virgata Torr. & A. Gray ex A. Gray -- accepted -- sugarstick
  Alnus oblongifolia Torr. -- accepted -- Arizona alder, oblong leaf alder
  Alopecurus geniculatus var. aristulatus (Michx.) Torr. -- not accepted
  Aloysia macrostachya (Torr.) Moldenke -- accepted -- Rio Grande beebrush
  Alsine jamesiana (Torr.) A. Heller -- not accepted
  Alsine jamesii (Torr.) Holz. -- not accepted
  Amaranthus fimbriatus (Torr.) Benth. ex S. Watson -- accepted -- fringed amaranth, fringed pigweed
  Amaranthus fimbriatus var. denticulatus (Torr.) Uline & W.L. Bray -- not accepted -- fringed amaranth, fringed pigweed
  Amaranthus fimbriatus var. fimbriatus (Torr.) Benth. ex S. Watson -- not accepted -- fringed amaranth, fringed pigweed
  Ambrosia coronopifolia Torr. & A. Gray -- not accepted
  Ambrosia deltoidea (Torr.) Payne -- accepted -- triangle bur ragweed, triangle burr ragweed, triangle bursage
  Ambrosia monogyra (Torr. & A. Gray) Strother & B.G. Baldw. -- accepted -- singlewhorl burrobrush
  Ambrosia psilostachya var. coronopifolia (Torr. & A. Gray) Farw. -- not accepted
  Ambrosia salsola (Torr. & A. Gray) Strother & B.G. Baldw. -- accepted -- burrobrush
  Ambrosia salsola var. salsola (Torr. & A. Gray) Strother & B.G. Baldw. -- not accepted
  Ambrosia trifida var. integrifolia (Muhl. ex Willd.) Torr. & A. Gray -- not accepted
  Amelanchier alnifolia var. pumila (Torr. & A. Gray) C.K. Schneid. -- accepted -- dwarf serviceberry
  Amelanchier canadensis var. pumila Torr. & A. Gray -- not accepted -- Canadian serviceberry
  Amelanchier oblongifolia (Torr. & A. Gray) M. Roem. -- not accepted
  Amelanchier pumila (Torr. & A. Gray) Nutt. ex M. Roem. -- not accepted -- dwarf serviceberry
  Amerosedum lanceolatum (Torr.) Á. Löve & D. Löve -- not accepted
  Ammobroma Torr. ex A. Gray -- not accepted
  Ammobroma sonorae Torr. ex A. Gray -- not accepted
  Ammophila brevipilis (Torr.) Benth. ex Vasey -- not accepted
  Ammoselinum Torr. & A. Gray -- accepted -- sandparsley
  Ammoselinum popei Torr. & A. Gray -- accepted -- plains sandparsley
  Amorpha paniculata Torr. & A. Gray -- accepted -- panicled false indigo, panicled indigobush
  Amphianthus Torr. -- not accepted
  Amphianthus Torr. -- not accepted
  Amphianthus pusillus Torr. -- not accepted -- little amphianthus
  Amphicarpaea pitcheri Torr. & A. Gray -- not accepted
  Amphipappus Torr. & A. Gray -- accepted -- amphipappus, chaffbush
  Amphipappus fremontii Torr. & A. Gray ex A. Gray -- accepted -- chaffbush, Fremont's chaffbush
  Amphipappus fremontii ssp. fremontii Torr. & A. Gray ex A. Gray -- not accepted -- Fremont's chaffbush
  Amphipappus fremontii var. fremontii Torr. & A. Gray ex A. Gray -- accepted -- chaff-bush, Fremont's chaffbush
  Amsonia longiflora Torr. -- accepted -- tubular bluestar
  Amsonia longiflora var. longiflora Torr. -- accepted -- tubular bluestar
  Amsonia tomentosa Torr. & Frém. -- accepted -- woolly amosonia, woolly bluestar
  Amsonia tomentosa var. tomentosa Torr. & Frém. -- accepted -- woolly bluestar
  Anatherostipa brevis (Torres) Peńailillo -- accepted
  Andropogon glaucus Torr. -- not accepted
  Andropogon jamesii Torr. -- not accepted
  Androsace carinata Torr. -- not accepted
  Androsace chamaejasme ssp. carinata (Torr.) Hultén -- not accepted -- sweetflower rockjasmine
  Androsace chamaejasme var. carinata (Torr.) R. Knuth -- not accepted
  Androstephium Torr. -- accepted -- funnel lily, funnellily
  Androstephium violaceum Torr. -- accepted
  Anemone decapetala var. heterophylla (Torr. & A. Gray) Britton & Rusby -- not accepted
  Anemone globosa (Torr. & A. Gray) Nutt. ex Pritz. -- not accepted
  Anemone heterophylla Nutt. ex Torr. & A. Gray (pro. syn.) -- not accepted
  Anemone heterophyllum Nutt. ex Torr. & A. Gray (pro. syn.) -- not accepted
  Anemone multifida ssp. globosa (Torr. & A. Gray) Torr. & A. Gray -- not accepted
  Anemone multifida var. globosa Torr. & A. Gray -- not accepted
  Angelica arguta Nutt. ex Torr. & A. Gray -- accepted -- angelica, Lyall's angelica, sharptooth angelica
  Anisacanthus juncea (Torr.) Hemsl. -- accepted
  Anisacanthus junceus (Torr.) Hemsl. -- not accepted
  Anisacanthus puberulus (Torr.) Henrickson & E.J. Lott -- accepted -- dwarf desert honeysuckle
  Anisacanthus quadrifidus var. wrightii (Torr.) Henrickson -- accepted -- Wright's anisacanth, Wright's desert honeysuckle
  Anisacanthus thurberi (Torr.) A. Gray -- accepted -- desert honeysuckle, Thurber's desert honeysuckle
  Anisacanthus wrightii (Torr.) A. Gray -- not accepted
  Anisocoma Torr. & A. Gray -- accepted -- anisocoma
  Anisocoma acaulis Torr. & A. Gray -- accepted -- scale bud, scalebud
  Anisophyllum fendleri (Torr. & A. Gray) Klotzsch & Garcke -- not accepted
  Anisophyllum melanadenium (Torr. & A. Gray) Klotzsch & Garcke -- not accepted
  Anogra coronopifolia (Torr. & A. Gray) Britton -- not accepted
  Antennaria dimorpha (Nutt.) Torr. & A. Gray -- accepted -- low everlasting, low pussytoes
  Antennaria luzuloides Torr. & A. Gray -- accepted -- rush pussytoes
  Antennaria luzuloides ssp. luzuloides Torr. & A. Gray -- accepted -- rush pussytoes
  Antennaria monocephala (Torr. & A. Gray) Greene non Antennaria monocephala DC. -- not accepted
  Antennaria plantaginifolia var. monocephala Torr. & A. Gray -- not accepted
  Anticlea fremontii Torr. -- not accepted
  Antiphytum floribundum (Torr.) A. Gray -- accepted -- Texas saucerflower
  Anulocaulis leiosolenus (Torr.) Standl. -- accepted -- ringstem, southwestern ringstem
  Anulocaulis leiosolenus var. leiosolenus (Torr.) Standl. -- accepted -- southwestern ringstem
  Anychiastrum baldwinii (Torr. & A. Gray) Small -- not accepted
  Apargidium Torr. & A. Gray -- not accepted
  Apargidium boreale (Bong.) Torr. & A. Gray -- not accepted
  Aphanostephus riddellii Torr. & A. Gray -- accepted -- Riddell's dozedaisy
  Aphyllon fasciculatum (Nutt.) Torr. & A. Gray -- not accepted
  Apiastrum Nutt. ex Torr. & A. Gray -- accepted
  Aplectrum Torr. -- accepted -- Adam and Eve
  Aplectrum hyemale (Muhl. ex Willd.) Torr. -- accepted -- Adam and Eve, aplectrelle d'hiver, puttyroot
  Aplopappus tortifolius Torr. & A. Gray -- not accepted
  Arabis brachycarpa (Torr. & A. Gray) Britton -- not accepted
  Arabis dentata (Torr.) Torr. & A. Gray -- not accepted
  Arabis hirsuta var. glabrata Torr. & A. Gray -- not accepted -- mountain rockcress
  Arctomecon Torr. & Frém. -- accepted -- bearpoppy
  Arctomecon californica Torr. & Frém. -- accepted -- California bearpoppy
  Arenaria benthamii Fenzl ex Torr. & A. Gray -- accepted -- hilly sandwort
  Arenaria brevifolia Nutt. ex Torr. & A. Gray -- not accepted
  Arenaria douglasii Fenzl ex Torr. & A. Gray -- not accepted
  Arenaria jamesiana (Torr.) Shinners -- not accepted
  Argythammia blodgettii (Torr.) Chapm. -- not accepted
  Argythammia serrata (Torr.) Müll. Arg. -- not accepted
  Argythamnia blodgettii (Torr.) Chapm. -- not accepted -- Blodgett's silverbush
  Argythamnia humilis var. laevis (Torr.) Shinners -- not accepted -- low silverbush, low wildmercury
  Argythamnia laevis Torr. -- not accepted
  Argythamnia serrata (Torr.) Müll. Arg. -- not accepted -- sawtooth ditaxis, Yuma silverbush
  Aristida fasciculata Torr. -- not accepted
  Aristolochia californica Torr. -- accepted -- California dutchman's pipe
  Arnoglossum diversifolium (Torr. & A. Gray) H. Rob. -- accepted -- variableleaf Indian plaintain, variableleaf Indian plantain
  Arrhenatherum kentuckensis Torr. -- not accepted
  Arrhenatherum pensylvanicum (L.) Torr. -- not accepted
  Artemisia elatior (Torr. & A. Gray) Rydb. -- not accepted
  Artemisia filifolia Torr. -- accepted -- sand sagebrush, sandhill sage, silvery wormwood
  Artemisia ludoviciana var. gnaphalodes (Nutt.) Torr. & A. Gray -- not accepted
  Artemisia ludoviciana var. latifolia (Besser) Torr. & A. Gray -- not accepted
  Artemisia tilesii ssp. elatior (Torr. & A. Gray) Hultén -- not accepted -- Tilesius' wormwood
  Artemisia tilesii var. elatior Torr. & A. Gray -- not accepted
  Artemisia vulgaris var. mexicana (Willd. ex Spreng.) Torr. & A. Gray -- not accepted
  Arundo brevipilis Torr. -- not accepted
  Arundo coarctata Torr. -- not accepted
  Asclepias arenaria Torr. -- accepted -- sand milkweed
  Asclepias auriculata (Engelm. ex Torr.) Holz. -- not accepted
  Asclepias brachystephana Engelm. ex Torr. -- accepted -- bract milkweed, short-crowned milkweed, shortcrown milkweed
  Asclepias erosa Torr. -- accepted -- desert milkweed
  Asclepias fremontii Torr. -- not accepted
  Asclepias involucrata Engelm. ex Torr. -- accepted -- dwarf milkweed
  Asclepias latifolia (Torr.) Raf. -- accepted -- broadleaf milkweed, corn-kernel milkweed
  Asclepias macrotis Torr. -- accepted -- long-hood milkweed, longhood milkweed, longhorn milkweed
  Asclepias meadii Torr. ex A. Gray -- accepted -- Mead's milkweed
  Asclepias nummularia Torr. -- accepted -- tufted milkweed
  Asclepias speciosa Torr. -- accepted -- showy milkweed
  Asclepias viridiflora var. lanceolata Torr. -- not accepted
  Asclepias viridiflora var. obovata (Elliott) Torr. -- not accepted
  Aster alpigenus (Torr. & A. Gray) A. Gray -- not accepted
  Aster alpigenus ssp. alpigenus (Torr. & Gray) Gray -- not accepted -- tundra aster
  Aster anomalus Engelm. ex Torr. & A. Gray -- not accepted -- manyray aster
  Aster ascendens var. fremontii Torr. & A. Gray -- not accepted
  Aster baldwinii Torr. & A. Gray. -- not accepted
  Aster borealis (Torr. & A. Gray) Prov. -- not accepted -- rush aster
  Aster chapmanii Torr. & A. Gray -- not accepted -- savannah aster
  Aster commutatus (Torr. & A. Gray) A. Gray -- not accepted
  Aster curtisii Torr. & A. Gray -- not accepted
  Aster divaricatus (Nutt.) Torr. & A. Gray non L. -- not accepted -- aster ŕ rameaux étalés, serpentine aster, white wood aster
  Aster dumosus var. cordidifolius (Michx.) Torr. & A. Gray -- not accepted
  Aster dumosus var. coridifolius (Michx.) Torr. & A. Gray -- not accepted
  Aster dumosus var. gracilentus Torr. & A. Gray -- not accepted
  Aster dumosus var. strictior Torr. & A. Gray -- not accepted -- rice button aster
  Aster dumosus var. subulifolius Torr. & A. Gray -- not accepted -- rice button aster
  Aster elegans (Nutt.) Torr. & A. Gray non Willd. -- not accepted
  Aster elliotti Torr. & A. Gray -- not accepted
  Aster elliottii Torr. & A. Gray -- not accepted
  Aster elodes Torr. & A. Gray -- not accepted
  Aster ericoides var. commutatus (Torr. & A. Gray) B. Boivin -- not accepted
  Aster ericoides var. commutatus (Torr. & A. Gray) B. Boivin -- not accepted
  Aster ericoides var. platyphyllus Torr. & A. Gray -- not accepted
  Aster ericoides var. stricticaulis (Torr. & A. Gray) F.C. Gates -- not accepted -- white heath aster
  Aster ericoides var. villosus (Michx.) Torr. & A. Gray -- not accepted
  Aster eryngiifolius Torr. & A. Gray -- not accepted -- thistleleaf aster
  Aster falcatus ssp. commutatus (Torr. & A. Gray) A.G. Jones -- not accepted
  Aster falcatus var. commutatus (Torr. & A. Gray) A.G. Jones -- not accepted -- cluster aster
  Aster fremonti (Torr. & A. Gray) A. Gray -- not accepted
  Aster fremontii (Torr. & A. Gray) A. Gray -- not accepted
  Aster frondosus (Nutt.) Torr. & A. Gray -- not accepted
  Aster glabriuscula (Nutt.) Torr. & A. Gray -- not accepted
  Aster glaucus Torr. & A. Gray non Nees -- not accepted
  Aster laxifolius var. borealis Torr. & A. Gray -- not accepted
  Aster lindleyanus Torr. & A. Gray -- not accepted
  Aster lutescens (Lindl. ex DC.) Torr. & A. Gray -- not accepted
  Aster mirabilis Torr. & A. Gray -- not accepted -- bouquet aster
  Aster multiflorus var. commutatus Torr. & A. Gray -- not accepted
  Aster multiflorus var. stricticaulis Torr. & A. Gray -- not accepted
  Aster novi-belgii var. elodes (Torr. & A. Gray) A. Gray -- not accepted -- New Belgium aster
  Aster occidentalis (Nutt.) Torr. & A. Gray -- not accepted -- western aster
  Aster occidentalis var. fremontii (Torr. & A. Gray) A.G. Jones -- not accepted -- Fremont's aster
  Aster occidentalis var. occidentalis (Nutt.) Torr. & Gray -- not accepted -- western aster
  Aster oregonum (Nutt.) Torr. & A. Gray -- not accepted
  Aster oregonus auct. non (Nutt.) Torr. & A. Gray -- not accepted
  Aster patens var. patentissimus (Lindl. ex DC.) Torr. & A. Gray -- not accepted -- late purple aster
  Aster phyllolepis Torr. & A. Gray -- not accepted
  Aster pilosus var. platyphyllus (Torr. & A. Gray) S.F. Blake -- not accepted
  Aster ptarmicoides (Nees) Torr. & A. Gray -- not accepted
  Aster puniceus ssp. elliottii (Torr. & A. Gray) A.G. Jones -- not accepted
  Aster puniceus var. elliottii (Torr. & A. Gray) A.G. Jones -- not accepted -- Elliott's aster
  Aster puniceus var. firmus (Nees) Torr. & A. Gray -- not accepted -- purplestem aster
  Aster simplex var. ramosissimus (Torr. & A. Gray) Cronquist -- not accepted
  Aster stricticaulis (Torr. & A. Gray) Rydb. -- not accepted
  Aster tenuifolius var. ramosissimus Torr. & A. Gray -- not accepted
  Aster tortifolius (Torr. & A. Gray) A. Gray non Michx. -- not accepted
  Aster xylorhiza (Nutt.) Torr. & A. Gray -- not accepted
  Astragalus beckwithii Torr. & A. Gray -- accepted -- Beckwith's milkvetch
  Astragalus beckwithii var. beckwithii Torr. & A. Gray -- accepted -- Beckwith's milkvetch
  Astragalus calycosus Torr. ex S. Watson -- accepted -- matted poison milkvetch, mattedmilkvetch, Torrey's milkvetch
  Astragalus calycosus var. calycosus Torr. ex S. Watson -- accepted -- Torrey milkvetch, Torrey's milkvetch
  Astragalus crassicarpus var. trichocalyx (Nutt. ex Torr. & A. Gray) Barneby ex Gleason -- accepted -- groundplum milkvetch, Ozark groundplum
  Astragalus decumbens (Nutt. ex Torr. & A. Gray) A. Gray -- not accepted
  Astragalus distortus Torr. & A. Gray -- accepted -- bentpod milkvetch, Ozark milkvetch
  Astragalus distortus var. distortus Torr. & A. Gray -- accepted -- Ozark milkvetch
  Astragalus douglasii (Torr. & A. Gray) A. Gray -- accepted -- Douglas' milkvetch, Jacumba milkvetch
  Astragalus douglasii var. douglasii (Torr. & A. Gray) A. Gray -- accepted -- Douglas's milkvetch, Jacumba milkvetch
  Astragalus filipes Torr. ex A. Gray -- accepted -- basalt milkvetch, threadstalk milkvetch
  Astragalus flavus Nutt. ex Torr. & A. Gray -- accepted -- yellow milkvetch
  Astragalus fremontii A. Gray ex Torr. -- not accepted
  Astragalus goniatus Nutt. ex Torr. & A. Gray -- not accepted
  Astragalus lentiginosus var. fremontii (A. Gray ex Torr.) S. Watson -- accepted -- Fremont's milkvetch
  Astragalus leptocarpus Torr. & A. Gray -- accepted -- rare loco milkvetch, slimpod milkvetch
  Astragalus leucopsis (Torr. & A. Gray) Torr. -- not accepted
  Astragalus lonchocarpus Torr. -- accepted -- great rushy milkvetch, rushy milkvetch
  Astragalus mexicanus var. trichocalyx (Nutt. ex Torr. & A. Gray) Fernald -- not accepted
  Astragalus miser var. decumbens (Nutt. ex Torr. & A. Gray) Cronquist -- accepted -- prostrate milkvetch
  Astragalus mollissimus Torr. -- accepted -- purple locoweed, woolly loco, woolly locoweed, woolly milkvetch
  Astragalus mollissimus var. mollissimus Torr. -- accepted -- woolly locoweed, woolly milkvetch
  Astragalus neglectus (Torr. & A. Gray) E. Sheld. -- accepted -- Cooper's milk-vetch, Cooper's milkvetch
  Astragalus nuttallianus var. trichocarpus Torr. & A. Gray -- accepted -- hairypod milkvetch, turkey peas, turkeypeas
  Astragalus nuttallii (Torr. & A. Gray) J.T. Howell -- accepted -- Nuttall's milkvetch
  Astragalus nuttallii var. nuttallii (Torr. & A. Gray) J.T. Howell -- accepted -- Nuttall's milkvetch
  Astragalus pachycarpus Torr. & A. Gray -- not accepted
  Astragalus pubentissimus Torr. & A. Gray -- accepted -- Green River milkvetch
  Astragalus pubentissimus var. pubentissimus Torr. & A. Gray -- accepted -- Green River milkvetch
  Astragalus reflexus Torr. & A. Gray -- accepted -- drooping milkvetch
  Astragalus stenophyllis Torr. & A. Gray -- not accepted
  Astragalus stenophyllus Torr. & A. Gray -- not accepted
  Astragalus stenophyllus var. filipes (Torr. ex A. Gray) Tidestr. -- not accepted
  Astragalus trichocalyx Nutt. ex Torr. & A. Gray -- not accepted
  Astragalus trichopodus ssp. leucopsis (Torr. & A. Gray) Thorne -- not accepted
  Astragalus utahensis (Torr.) Torr. & A. Gray -- accepted -- Utah locoweed, Utah milkvetch
  Astragalus viridis (Nutt. ex Torr. & A. Gray) E. Sheld. -- not accepted
  Astragalus whitneyi ssp. hookerianus (Torr. & A. Gray) Abrams -- not accepted
  Atriplex acanthocarpa (Torr.) S. Watson -- accepted -- tubercled saltbush
  Atriplex acanthocarpa ssp. acanthocarpa (Torr.) S. Watson -- not accepted -- tubercled saltbush
  Atriplex acanthocarpa var. acanthocarpa (Torr.) S. Watson -- accepted -- tubercled saltbush
  Atriplex canescens var. angustifolia (Torr.) S. Watson -- not accepted -- fourwing saltbush
  Atriplex canescens var. occidentalis (Torr. & Frém.) S.L. Welsh & Stutz -- not accepted
  Atriplex confertifolia (Torr. & Frém.) S. Watson -- accepted -- shadscale, shadscale saltbush, spiny saltbush
  Atriplex hymenelytra (Torr.) S. Watson -- accepted -- desert holly, desertholly, Yuma desert holly
  Atriplex lentiformis (Torr.) S. Watson -- accepted -- big saltbush, quailbush
  Atriplex lentiformis ssp. lentiformis (Torr.) S. Watson -- not accepted -- big saltbush
  Atriplex phyllostegia (Torr. ex S. Watson) S. Watson -- accepted -- arrow saltbush, arrow saltweed, leafcover saltweed
  Atriplex polycarpa (Torr.) S. Watson -- accepted -- cattle saltbush, desert saltbush
  Atriplex pusilla (Torr. ex S. Watson) S. Watson -- accepted -- smallscale, smooth saltbush
  Atriplex suckleyi (Torr.) Rydb. -- not accepted -- Suckley's orach
  Atriplex truncata (Torr. ex S. Watson) A. Gray -- accepted -- wedgescale saltbush
  Aureolaria grandiflora ssp. serrata (Torr. ex Benth.) Pennell -- not accepted
  Aureolaria grandiflora var. serrata (Torr. ex Benth.) Pennell -- not accepted -- largeflower yellow false foxglove
  Avenastrum pubescens (Huds.) Jess. ex Dalla Torre -- not accepted
  Axonopus repens (P.J. Bergius) Torrend -- not accepted
  Azalea californica Torr. & A. Gray ex Durand -- not accepted
  Azalea occidentalis Torr. & A. Gray ex Torr. -- not accepted
  Baccharis salicina Torr. & A. Gray -- accepted -- Emory's baccharis, Great Plains false willow, Great Plains falsewillow, willow baccharis
  Baccharis texana (Torr. & A. Gray) A. Gray -- accepted -- prairie baccharis, prairie false willow, prairie falsewillow
  Baeria fremontii (Torr. ex A. Gray) A. Gray -- not accepted
  Baptisia lecontei Torr. & A. Gray -- accepted -- pineland wild indigo
  Baptisia leucantha Torr. & A. Gray -- not accepted
  Baptisia megacarpa Chapm. ex Torr. & A. Gray -- accepted -- Apalachicola wild indigo
  Basistelma angustifolia (Torr.) Bartlett, non Cynanchum angustifolium Pers. -- not accepted
  Bazzania denudata (Torrey ex Gott. et al.) Trev. -- accepted -- bazzania
  Berberis fremontii Torr. -- accepted -- Fremont's berberis
  Berlandiera dealbata (Torr. & A. Gray) Small -- not accepted
  Berlandiera incisa Torr. & A. Gray -- not accepted
  Berlandiera texana var. bentonicifolia (Hook.) Torr. & A. Gray -- not accepted
  Berlandiera texana var. betonicifolia (Hook.) Torr. & A. Gray -- not accepted
  Berlandiera tomentosa var. dealbata Torr. & A. Gray -- not accepted
  Berula erecta var. incisa (Torr.) Cronquist -- not accepted
  Berula incisa (Torr.) G.N. Jones -- not accepted
  Bidens beckii Torr. ex Spreng. -- accepted -- Beck's water-marigold, Henderson's water-marigold, Oregon water-marigold
  Bidens cernua var. elata Torr. & A. Gray -- not accepted
  Bidens discoidea (Torr. & A. Gray) Britton -- accepted -- discoid beggarticks, small beggarticks, swamp beggar-ticks
  Bidens elata (Torr. & A. Gray) Sherff -- not accepted
  Blepharoneuron tricholepis (Torr.) Nash -- not accepted -- pine dropseed
  Bloomeria crocea (Torr.) Coville -- accepted -- common goldenstar
  Bloomeria crocea var. crocea (Torr.) Coville -- accepted -- common goldenstar
  Boechera brachycarpa (Torr. & A. Gray) Dorn -- not accepted
  Boerhavia anisophylla Torr. -- accepted -- wineflower
  Boerhavia leiosolena Torr. -- not accepted
  Boisduvalia densiflora var. salicina (Nutt. ex Torr. & A. Gray) Munz -- not accepted
  Boisduvalia salicina (Nutt. ex Torr. & A. Gray) Rydb. -- not accepted
  Bolboschoenus fluviatilis (Torr.) Soják -- accepted -- river bulrush
  Bolboschoenus maritimus ssp. fluviatilis (Torr.) Á. Löve & D. Löve -- not accepted
  Boltonia asteroides var. decurrens (Torr. & A. Gray) Fernald -- not accepted
  Boltonia decurrens (Torr. & A. Gray) Alph. Wood -- accepted -- claspingleaf doll's daisy, decurrent false aster
  Boltonia latisquama var. decurrens (Torr. & A. Gray) Fernald & Grisc. -- not accepted
  Bonamia ovalifolia (Torr.) Hallier f. -- accepted -- bigpod bonamia, bigpod lady's nightcap
  Bonamia pickeringii (Torr. ex M.A. Curtis) A. Gray -- not accepted
  Bouchea spathulata Torr. -- accepted -- spoonleaf
  Bouteloua curtipendula (Michx.) Torr. -- accepted -- sideoats grama
  Bouteloua curtipendula var. curtipendula (Michx.) Torr. -- accepted -- side-oats grama, sideoats grama
  Bouteloua eriopoda (Torr.) Torr. -- accepted -- black grama
  Bouteloua foenea (Torr.) Torr. ex S. Watson -- not accepted
  Bouteloua oligostachya (Nutt.) Torr. ex A. Gray -- not accepted
  Bouteloua pappilosa (Engelm.) Torr. -- not accepted
  Bouteloua polystachya (Benth.) Torr. -- not accepted
  Bouteloua polystachya var. polystachya (Benth.) Torr. -- not accepted
  Boykinia jamesii (Torr.) Engl. -- not accepted -- James' telesonix
  Boykinia occidentalis Torr. & A. Gray -- accepted -- coast boykinia, coastal brookfoam
  Brachiaria fasciculata var. reticulata (Torr.) Vickery -- not accepted
  Brachiaria fasciculata var. reticulata (Torr.) Beetle -- not accepted
  Bradburia Torr. & A.Gray -- accepted -- bradburia
  Bradburia hirtella Torr. & A. Gray -- accepted -- Texas chrysopsis
  Breweria ovalifolia (Torr.) A. Gray -- not accepted
  Breweria pickeringii (Torr. ex M.A. Curtis) A. Gray -- not accepted
  Brickellia californica (Torr. & A. Gray) A. Gray -- accepted -- California brickellbush, Jepson's brickellbush
  Brickellia californica var. californica (Torr. & A. Gray) A. Gray -- not accepted -- California brickellbush
  Brickellia eupatorioides var. corymbulosa (Torr. & A. Gray) Shinners -- accepted -- false boneset
  Brickellia eupatorioides var. gracilis (Torr. & Gray) Kartesz & Gandhi -- not accepted
  Brizopyrum spicatum var. strictum (Torr.) A. Gray ex S. Watson -- not accepted
  Brodiaea coronaria var. macropoda (Torr.) Hoover -- not accepted
  Brodiaea pulchella var. pauciflora (Torr.) C.V. Morton -- not accepted
  Bromus breviaristatus (Hook.) Thurb. ex Torr. -- not accepted
  Bromus kalmii var. aristulatus Torr. -- not accepted
  Browallia texana Torr. -- not accepted
  Buckleya Torr. -- accepted
  Buckleya distichophylla (Nutt.) Torr. -- accepted -- piratebush
  Buddleja racemosa Torr. -- accepted -- Texas butterflybush, wand butterflybush
  Buddleja racemosa ssp. incana (Torr.) Norm. -- not accepted -- wand butterflybush
  Buddleja racemosa ssp. racemosa Torr. -- not accepted -- wand butterflybush
  Buddleja racemosa var. incana Torr. -- accepted -- wand butterflybush
  Buddleja racemosa var. racemosa Torr. -- accepted -- wand butterflybush
  Bulbostylis californica Torr. & Gray -- not accepted
  Bulbostylis warei (Torr.) C.B. Clarke -- accepted -- Ware's hairsedge
  Cacalia diversifolia Torr. & A. Gray -- not accepted
  Caesalpinia drummondii (Torr. & A. Gray) Fisher -- not accepted -- dwarf nicker
  Caesalpinia jamesii (Torr. & A. Gray) Fisher -- not accepted -- James' holdback, James' rushpea
  Caiandra schottii Torr. ex S. Watson -- not accepted
  Calamagrostis brevipilis (Torr.) L.C. Beck -- not accepted
  Calamagrostis coarctata Torr. ex Eaton -- accepted -- arctic reedgrass
  Calamintha canescens Torr. & A. Gray ex Benth. -- not accepted
  Calamintha glabella var. angustifolia (Torr.) DeWolf -- not accepted
  Calamovilfa brevipilis (Torr.) Hack. ex Scribn. & Southw. -- accepted -- pine barren sandreed
  Calamovilfa brevipilis var. brevipilis (Torr.) Hack. ex Scribn. & Southw. -- not accepted
  Calliandra schottii Torr. ex S. Watson -- not accepted -- Schott false mesquite, Schott's stickpea
  Callirhoe involucrata (Torr. & A. Gray) A. Gray -- accepted -- low poppymallow, purple poppy mallow, purple poppymallow, winecup
  Callirhoe involucrata var. involucrata (Torr. & A. Gray) A. Gray -- accepted -- purple poppy mallow, purple poppymallow
  Callirhoe involucrata var. lineariloba (Torr. & A. Gray) A. Gray -- accepted -- purple poppymallow
  Callisia micrantha (Torr.) D.R. Hunt -- accepted -- littleflower roseling
  Callitriche marginata Torr. -- accepted -- winged water-starwort
  Callitriche nuttallii Torr. -- not accepted -- Nuttall's waterstarwort
  Calocedrus decurrens (Torr.) Florin -- accepted -- incense cedar
  Calochortus nuttallii Torr. & A. Gray -- accepted -- sego lily, sego-lily
  Calophanes linearis (Torr. & A. Gray) A. Gray -- not accepted
  Caltha palustris var. flabellifolia (Pursh) Torr. & A. Gray -- not accepted
  Calycadenia tenella (Nutt.) Torr. & A. Gray -- not accepted
  Calycanthus floridus var. glaucus (Willd.) Torr. & A. Gray -- accepted -- eastern sweetshrub
  Calycanthus floridus var. laevigatus (Willd.) Torr. & A. Gray -- not accepted
  Calylophus hartwegii ssp. lavandulifolius (Torr. & A. Gray) Towner & P.H. Raven -- not accepted
  Calylophus hartwegii var. lavandulifolius (Torr. & A. Gray) Shinners -- not accepted
  Calylophus lavandulifolius (Torr. & A. Gray) P.H. Raven -- not accepted -- lavender calylophus, lavender sundrop, lavenderleaf eveningprimrose, lavenderleaf sundrops
  Calylophus serrulatus var. spinulosus (Nutt. ex Torr. & A. Gray) Shinners -- not accepted
  Calymmandra candida Torr. & A. Gray -- not accepted
  Calyptridium umbellatum (Torr.) Greene -- not accepted
  Calyptridium umbellatum var. umbellatum (Torr.) Greene -- not accepted
  Calytophus lavandulifolius (Torr. & A. Gray) P.H. Raven -- not accepted
  Camissonia bistorta (Nutt. ex Torr. & A. Gray) P.H. Raven -- not accepted -- southern suncup
  Camissonia breviflora (Torr. & A. Gray) P.H. Raven -- not accepted -- fewflower evening primrose, fewflower evening-primrose, shortflower suncup
  Camissonia californica (Nutt. ex Torr. & A. Gray) P.H. Raven -- not accepted -- California primrose, California suncup
  Camissonia cardiophylla (Torr.) P.H. Raven -- not accepted -- heart-leaf suncup, heartleaf suncup
  Camissonia cardiophylla ssp. cardiophylla (Torr.) P.H. Raven -- not accepted -- heartleaf suncup
  Camissonia claviformis (Torr. & Frém.) P.H. Raven -- not accepted -- browneyes, clavatefruit suncup
  Camissonia claviformis ssp. claviformis (Torr. & Frém.) P.H. Raven -- not accepted -- browneyes
  Camissonia ovata (Nutt. ex Torr. & A. Gray) P.H. Raven -- not accepted -- goldeneggs
  Camissonia parvula (Nutt. ex Torr. & A. Gray) P.H. Raven -- accepted -- Lewis River suncup
  Camissonia scapoidea (Torr. & A. Gray) P.H. Raven -- not accepted -- barestem eveningprimrose, Paiute suncup, scapoid suncup
  Camissonia scapoidea ssp. scapoidea (Torr. & A. Gray) P.H. Raven -- not accepted -- Paiute suncup, Seorsa evening primrose, Seorsa eveningprimrose
  Camissonia tanacetifolia (Torr. & A. Gray) P.H. Raven -- not accepted -- tansyleaf evening primrose, tansyleaf evening-primrose, tansyleaf suncup
  Camissonia tanacetifolia ssp. tanacetifolia (Torr. & A. Gray) P.H. Raven -- not accepted -- tansyleaf evening primrose, tansyleaf evening-primrose, tansyleaf suncup
  Camissoniopsis bistorta (Nutt. ex Torr. & A. Gray) W.L. Wagner & Hoch -- accepted -- southern suncup
  Canotia Torr. -- accepted
  Canotia holacantha Torr. -- accepted -- crucifixion thorn
  Cardamine oligosperma var. lucens G.S. Torr. -- not accepted
  Carduus lecontei (Torr. & A. Gray) Pollard -- not accepted
  Carex alata Torr. -- accepted -- broadwing sedge
  Carex albicans var. emmonsii (Dewey ex Torr.) Rettig -- accepted -- Emmons' sedge
  Carex barrattii Schwein. & Torr. -- accepted -- Barratt's sedge
  Carex bigelowii Torr. ex Schwein. -- accepted -- Bigelow's sedge
  Carex bigelowii ssp. bigelowii Torr. ex Schwein. -- accepted -- Bigelow's sedge
  Carex careyana Torr. ex Dewey -- accepted -- Carey's sedge
  Carex complanata Torr. & Hook. -- accepted -- blue sedge, hirsute sedge
  Carex crinita var. gynandra (Schwein.) Schwein. & Torr. -- not accepted
  Carex davisii Schwein. & Torr. -- accepted -- Davis' sedge
  Carex elliottii Schwein. & Torr. -- accepted -- Elliott's sedge
  Carex emmonsii Dewey ex Torr. -- not accepted
  Carex houghtoniana Torr. ex Dewey -- accepted -- Houghton's sedge
  Carex houghtonii Torr. ex Dewey -- not accepted
  Carex houstonii Torr. -- accepted -- Houston's sedge
  Carex microdonta Torr. & Hook. -- accepted -- littletooth sedge
  Carex oxylepis Torr. & Hook. -- accepted -- sharpscale sedge
  Carex oxylepis var. oxylepis Torr. & Hook. -- not accepted -- sharpscale sedge
  Carex retroflexa var. texensis (Torr.) Fernald -- not accepted
  Carex texensis (Torr.) L.H. Bailey -- accepted -- Texas sedge
  Carex turgescens Torr. -- accepted -- pine barren sedge, pinebarren sedge
  Carlowrightia linearifolia (Torr.) A. Gray -- accepted -- heath wrightwort
  Carpenteria Torr. -- accepted -- tree anemone
  Carpenteria californica Torr. -- accepted -- tree anemone
  Carphephorus bellidifolius (Michx.) Torr. & A. Gray -- accepted -- sandywoods chaffhead
  Carphephorus corymbosus (Nutt.) Torr. & A. Gray -- accepted -- coastal plain chaffhead, coastalplain chaffhead
  Carphephorus tomentosus (Michx.) Torr. & A. Gray -- accepted -- woolly chaffhead
  Caryopitys monophylla (Torr. & Frém.) Rydb. -- not accepted
  Castela erecta ssp. texana (Torr. & A. Gray) Cronquist -- not accepted -- allthorn goatbush, Texan goatbush
  Castela texana (Torr. & A. Gray) Rose -- accepted
  Castilleja occidentalis Torr. -- accepted -- western Indian paintbrush
  Caulanthus crassicaulis (Torr.) S. Watson -- accepted -- thick-stem wild cabbage, thickstem wild cabbage, thickstem wildcabbage
  Caulanthus crassicaulis var. crassicaulis (Torr.) S. Watson -- not accepted -- thick-stem wild cabbage, thickstem wild cabbage, thickstem wildcabbage
  Cayaponia boykinii (Torr. & A. Gray) Cogn. -- not accepted
  Cayaponia grandifolia (Torr. & A. Gray) Small -- not accepted
  Ceanothus americanus var. intermedius (Pursh) Torr. & A. Gray -- not accepted
  Ceanothus americanus var. pitcheri Torr. & A. Gray -- not accepted
  Ceanothus crassifolius Torr. -- accepted -- hoaryleaf ceanothus
  Ceanothus dentatus Torr. & A. Gray -- accepted -- sandscrub ceanothus
  Ceanothus herbaceus var. pubescens (Torr. & A. Gray ex S. Watson) Shinners -- not accepted
  Ceanothus incanus Torr. & A. Gray -- accepted -- coast whitethorn
  Ceanothus integerrimus var. macrothyrsus (Torr.) G.T. Benson -- not accepted
  Ceanothus ovatus var. pubescens Torr. & A. Gray ex S. Watson -- not accepted
  Ceanothus papillosus Torr. & A. Gray -- accepted -- wartleaf ceanothus
  Ceanothus papillosus ssp. papillosus Torr. & A. Gray -- not accepted -- King hybrid ceanothus
  Ceanothus papillosus var. papillosus Torr. & A. Gray -- accepted -- wartleaf ceanothus
  Ceanothus prostratus var. grandiflorus (Torr.) Jeps. -- not accepted
  Ceanothus pubescens (Torr. & A. Gray ex S. Watson) Rydb. ex Small -- not accepted
  Ceanothus rigidus var. grandiflorus Torr. -- not accepted
  Ceanothus velutinus var. laevigatus Torr. & A. Gray -- not accepted
  Celtis laevigata var. reticulata (Torr.) L.D. Benson -- not accepted -- netleaf hackberry
  Celtis occidentalis var. reticulata (Torr.) Sarg. -- not accepted
  Celtis pallida Torr. -- accepted -- desert hackberry, granjeno, spiny hackberry
  Celtis reticulata Torr. -- accepted -- netleaf hackberry, palo blanco
  Celtis spinosa var. pallida (Torr.) M.C. Johnst. -- not accepted
  Celtis tala var. pallida (Torr.) Planch. -- not accepted
  Cenchrus echinatus var. tribuloides (L.) Torr. -- not accepted
  Centaurium beyrichii (Torr. & A. Gray ex Torr.) B.L. Rob. -- not accepted -- mountain pink, quinineweed, rock centaury
  Centaurium beyrichii var. beyrichii (Torr. & A. Gray ex Torr.) B.L. Rob. -- not accepted -- quinineweed
  Cerastium arvense var. oblongifolium (Torr.) Hollick & Britton -- not accepted
  Cerastium oblongifolium Torr. -- not accepted
  Ceratozamia euryphyllidia Vázq. Torres, Sabato & D.W. Stev. -- accepted
  Ceratozamia morettii Vázq. Torres & Vovides -- accepted
  Ceratozamia sabatoi Vovides, Vázq. Torres, Schutzman & Iglesias -- accepted
  Cercidium microphyllum (Torr.) Rose & I.M. Johnst. -- not accepted
  Cercis occidentalis Torr. ex A. Gray -- accepted -- California redbud
  Cereus californicus Torr. & A. Gray -- not accepted
  Chaenactis glabriuscula var. heterocarpha (Torr. & A. Gray ex A. Gray) H.M. Hall -- accepted -- yellow pincushion
  Chaenactis heterocarpha Torr. & A. Gray ex A. Gray -- not accepted
  Chaerophyllum procumbens var. shortii Torr. & A. Gray -- accepted -- Short's spreading chervil
  Chaerophyllum shortii (Torr. & A. Gray) Bush -- not accepted
  Chaetaria fasciculata (Torr.) Schult. -- not accepted
  Chaetopappa ericoides (Torr.) G.L. Nesom -- accepted -- rose heath, smallflower aster
  Chamaebatiaria millefolium (Torr.) Maxim. -- accepted -- desert sweet, fernbush
  Chamaesyce albomarginata (Torr. & A. Gray) Small -- not accepted -- rattlesnake weed, whitemargin euphorbia, whitemargin sandmat, whitemargin spurge
  Chamaesyce fendleri (Torr. & A. Gray) Small -- not accepted -- Fendler's sandmat
  Chamaesyce fendleri var. fendleri (Torr. & A. Gray) Small -- not accepted -- Fendler's sandmat
  Chamaesyce hirsuta (Torr.) Arthur -- not accepted
  Chamaesyce melanadenia (Torr. & A. Gray) Millsp. -- not accepted -- prostrate spurge, red-gland spurge, squaw sandmat
  Chamaesyce setiloba (Engelm. ex Torr.) Norton -- not accepted
  Chamaesyce setiloba (Engelm. ex Torr.) Millsp. -- not accepted -- Yuma sandmat, Yuma spurge
  Chapmannia Torr. & A. Gray -- accepted
  Chapmannia floridana Torr. & A. Gray -- accepted -- Florida alicia
  Chenopodium hybridum var. simplex Torr. -- not accepted
  Chenopodium simplex (Torr.) Raf. -- accepted -- giant-seed goosefoot, mapleleaf goosefoot
  Chimaphila maculata var. dasystemma (Torr. ex Rydb.) Kearney & Peebles -- not accepted
  Chiogenes hispidula (L.) Torr. & A. Gray -- not accepted
  Chloris alba var. aristulata Torr. -- not accepted
  Chloris verticillata var. aristulata Torr. & A. Gray -- not accepted
  Choisya dumosa (Torr.) A. Gray -- accepted -- Mexican orange, starleaf
  Choisya dumosa var. dumosa (Torr.) A. Gray -- accepted -- Mexican orange
  Chondrophylla fremontii (Torr.) A. Nelson -- not accepted
  Chondrosium eriopodum Torr. -- not accepted
  Chondrosum eriopodum Torr. -- not accepted
  Chondrosum foeneum Torr. -- not accepted
  Chondrosum oligostachyum (Nutt.) Torr. -- not accepted
  Chondrosum papillosum (Engelm.) Torr. -- not accepted
  Chorizanthe brevicornu Torr. -- accepted -- brittle spineflower, sagebrush chorizanthe
  Chorizanthe brevicornu var. brevicornu Torr. -- accepted -- brittle spineflower
  Chorizanthe corrugata (Torr.) Torr. & A. Gray -- accepted -- wrinkled chorizanthe, wrinkled spineflower
  Chorizanthe fimbriata var. laciniata (Torr.) Jeps. -- accepted -- fringed spineflower
  Chorizanthe laciniata Torr. -- not accepted
  Chorizanthe polygonoides Torr. & A. Gray -- accepted -- knotweed spineflower
  Chorizanthe polygonoides var. polygonoides Torr. & A. Gray -- accepted -- knotweed spineflower
  Chorizanthe rigida (Torr.) Torr. & A. Gray -- accepted -- devil's spineflower, spiny chorizanthe, turkshead
  Chorizanthe uniaristata Torr. & A. Gray -- accepted -- oneawn spineflower
  Chorizanthe watsonii Torr. & A. Gray -- accepted -- five-tooth spineflower, fivetooth spineflower, Watson's chorizanthe
  Chrysamphora californica (Torr.) Greene -- not accepted
  Chrysopsis canescens (DC.) Torr. & A. Gray non DC. -- not accepted
  Chrysopsis oligantha Chapm. ex Torr. & A. Gray -- not accepted
  Chrysopsis scabrella Torr. & A. Gray -- accepted -- coastal plain goldenaster, coastalplain goldenaster
  Chylismia (Nutt. ex Torr. & A. Gray) Raim. -- accepted
  Chylismia cardiophylla (Torr.) Small -- accepted -- heartleaf suncup
  Chylismia cardiophylla ssp. cardiophylla (Torr.) Small -- accepted -- heartleaf suncup
  Chylismia claviformis (Torr. & Frém.) A. Heller -- accepted -- browneyes
  Chylismia claviformis ssp. claviformis (Torr. & Frém.) A. Heller -- accepted -- browneyes
  Chylismia scapoidea (Torr. & A. Gray) Small -- not accepted -- Paiute suncup
  Chylismia scapoidea (Torr. & A. Gray) Nutt. ex Raim. -- accepted
  Chylismia scapoidea ssp. scapoidea (Torr. & A. Gray) Nutt. ex Raim. -- accepted
  Chylismia scapoidea ssp. scapoidea (Torr. & A. Gray) Small -- not accepted -- Paiute suncup
  Cimicifuga cordifolia (DC.) Torr. & A. Gray -- not accepted
  Ciminalis fremontii (Torr.) W.A. Weber -- not accepted
  Cirsium drummondii Torr. & A. Gray -- accepted -- dwarf thistle
  Cirsium horridulum var. elliottii Torr. & A. Gray -- not accepted
  Cirsium lecontei Torr. & A. Gray -- accepted -- Le Conte's thistle
  Cirsium pitcheri (Torr. ex Eaton) Torr. & A. Gray -- accepted -- Pitcher's thistle, sand dune thistle
  Cistanthe umbellata (Torr.) Hershk. -- accepted -- Mt. Hood pussypaws, umbellate pussypaws
  Cistanthe umbellata var. umbellata (Torr.) Hershk. -- not accepted -- Mt. Hood pussypaws, pussypaws
  Cladium mariscoides (Muhl.) Torr. -- accepted -- smooth sawgrass
  Clarkia epilobioides (Nutt. ex Torr. & A. Gray) A. Nelson & J.F. Macbr. -- accepted -- canyon clarkia, canyon fairyfan
  Clarkia heterandra (Torr.) F.H. Lewis & P.H. Raven -- accepted -- mountain clarkia
  Claytonia exigua Torr. & A. Gray -- accepted -- serpentine springbeauty
  Claytonia exigua ssp. exigua Torr. & A. Gray -- accepted -- serpentine springbeauty
  Claytonia exigua ssp. glauca (Torr. & A. Gray) John M. Mill. & K.L. Chambers -- accepted -- serpentine springbeauty
  Claytonia heterophylla (Torr. & A. Gray) Swanson -- not accepted -- variableleaf springbeauty
  Claytonia lanceolata var. sessilifolia (Torr.) A. Nelson -- not accepted -- lanceleaf springbeauty
  Claytonia parviflora var. glauca Nutt. ex Torr. & A. Gray -- not accepted
  Claytonia perfoliata var. parviflora (Douglas ex Hook.) Torr. -- not accepted
  Claytonia sibirica var. heterophylla (Torr. & A. Gray) A. Gray -- not accepted
  Claytonia spathulata var. exigua (Torr. & A. Gray) Hook. & Arn. -- not accepted
  Claytonia spathulata var. tenuifolia Torr. & A. Gray -- not accepted
  Clematis baldwinii Torr. & A. Gray -- accepted -- pine hyacinth
  Clematis baldwinii var. baldwinii Torr. & A. Gray -- not accepted -- pine hyacinth
  Clematis bigelovii Torr. -- accepted -- Bigelow's clematis, Bigelow's leather flower
  Clematis columbiana (Nutt.) Torr. & A. Gray -- accepted -- Columbian virgin's-bower, rock clematis
  Clematis columbiana var. columbiana (Nutt.) Torr. & A. Gray -- accepted -- Columbian virginsbower, rock clematis
  Clematis drummondii Torr. & A. Gray -- accepted -- Drummond's clematis, old man's beard
  Clematis pitcheri Torr. & A. Gray -- accepted -- bluebill, Pitcher's clematis, Pitcher's virginsbower
  Clematis pitcheri var. pitcheri Torr. & A. Gray -- accepted -- bluebill, Pitcher's clematis
  Cleome platycarpa Torr. -- not accepted -- broadpod cleome, golden spiderflower
  Cleome tenuifolia Leconte ex Torr. & A. Gray (pro. syn.) -- not accepted
  Cleomella angustifolia Torr. -- accepted -- narrowleaf rhombopod
  Cleomella longipes Torr. -- accepted -- Chiricahua Mountain stinkweed
  Cleomella obtusifolia Torr. & Frém. -- accepted -- Mojave cleomella, Mojave stinkweed
  Clintonia andrewsiana Torr. -- accepted -- Andrew's clintonia
  Cnidoscolus angustidens Torr. -- accepted -- mala mujer
  Coelostylis Torr. & A. Gray -- not accepted
  Coelostylis loganioides Torr. & A. Gray ex Endl. & Fenzl -- not accepted
  Cogswellia daucifolia (Torr. & A. Gray) M.E. Jones -- not accepted
  Cogswellia macrocarpa (Nutt. ex Torr. & A. Gray) M.E. Jones -- not accepted
  Coldenia greggii (Torr. & A. Gray) A. Gray -- not accepted
  Coldenia hispidissima (Torr. & A. Gray) A. Gray -- not accepted
  Coldenia plicata (Torr.) Coville -- not accepted
  Coleataenia longifolia (Torr.) Soreng -- accepted
  Coleataenia longifolia ssp. longifolia (Torr.) Soreng -- accepted
  Coleogyne Torr. -- accepted -- blackbrush
  Coleogyne ramosissima Torr. -- accepted -- blackbrush
  Colubrina texensis (Torr. & A. Gray) A. Gray -- accepted -- Texan hogplum, Texas colubrina
  Colubrina texensis var. texensis (Torr. & A. Gray) A. Gray -- accepted -- Texan hogplum
  Comandra umbellata var. angustifolia (A. DC.) Torr. -- not accepted
  Comarella multifoliolata (Torr.) Rydb. -- not accepted
  Commelina anomala (Torr.) Woodson -- not accepted
  Commelina dianthifolia var. longispatha (Torr.) Brashier -- not accepted -- birdbill dayflower
  Commelina linearis var. longispatha Torr. -- not accepted
  Commelinantia anomala (Torr.) Tharp -- not accepted
  Condalia obtusifolia (Hook. ex Torr. & A. Gray) Weberb. -- not accepted
  Condalia parryi (Torr.) Weberb. -- not accepted
  Condaliopsis parryi (Torr.) Suess. -- not accepted
  Conradina canescens (Torr. & A. Gray ex Benth.) A. Gray -- accepted -- false rosemary
  Coptis occidentalis (Nutt.) Torr. & A. Gray -- accepted -- Idaho goldthread
  Cordia podocephala Torr. -- accepted -- Texas manjack
  Corema conradii (Torr.) Torr. ex Loudon -- accepted -- broom crowberry, corčme de Conrad, poverty-grass
  Coreopsis cardaminefolia (DC.) Torr. & A. Gray -- not accepted
  Coreopsis drummondii (D. Don) Torr. & A. Gray -- not accepted
  Coreopsis grandiflora var. longipes (Hook.) Torr. & A. Gray -- not accepted -- largeflower tickseed
  Coreopsis leavenworthii Torr. & A. Gray -- accepted -- Leavenworth's tickseed
  Corethrogyne tomentella (Hook. & Arn.) Torr. & A. Gray -- not accepted
  Coriflora baldwinii (Torr. & A. Gray) W.A. Weber -- not accepted
  Coriflora bigelovii (Torr.) W.A. Weber -- not accepted
  Coriflora pitcheri (Torr. & A. Gray) W.A. Weber -- not accepted
  Cornus alba var. occidentalis (Torr. & A. Gray) B. Boivin -- not accepted
  Cornus occidentalis (Torr. & A. Gray) Coville -- not accepted
  Cornus sericea ssp. occidentalis (Torr. & A. Gray) Fosberg -- accepted -- western dogwood
  Cornus sessilis Torr. ex Durand -- accepted -- blackfruit dogwood
  Cornus stolonifera var. occidentalis (Torr. & A. Gray) C.L. Hitchc. -- not accepted
  Cowania ericifolia Torr. ex A. Gray -- not accepted
  Cowania mexicana var. stansburiana (Torr.) Jeps. -- not accepted
  Cowania mexicana var. stansburyana (Torr.) Jeps. -- not accepted
  Cowania stansburiana Torr. -- not accepted
  Cowania stansburyana Torr. -- not accepted
  Crassula drummondii sensu (Torr. & A. Gray) Fedde -- not accepted -- smallleaf pygmyweed
  Crassula drummondii (Torr. & A. Gray) Fedde -- accepted -- small-leaf pygmyweed, smallleaf pygmyweed
  Crataegus aestivalis (Walter) Torr. & A. Gray -- accepted -- may hawthorn
  Crataegus berberifolia Torr. & A. Gray -- accepted -- barberry hawthorn, barberry-leaved hawthorn
  Crataegus berberifolia var. berberifolia Torr. & A. Gray -- accepted -- barberry hawthorn
  Crataegus mollis (Torr. & A. Gray) Scheele -- accepted -- Arnold hawthorn, downy hawthorn, red hawthorn
  Crataegus mollis var. mollis (Torr. & A. Gray) Scheele -- accepted -- downy hawthorn
  Crataegus nudiflora Nutt. ex Torr. & A. Gray -- not accepted
  Crepis glauca (Nutt.) Torr. & A. Gray -- not accepted
  Crepis runcinata (James) Torr. & A. Gray -- accepted -- dandelion hawksbeard, fiddle-leaf hawk's-beard, fiddle-leaf hawksbeard, fiddleleaf hawksbeard
  Crepis runcinata ssp. runcinata (James) Torr. & A. Gray -- accepted -- dandelion hawksbeard, fiddle-leaf hawk's-beard, fiddleleaf hawksbeard
  Cristatella jamesii Torr. & A. Gray -- not accepted
  Croftia parvifolia (Torr.) Small -- not accepted
  Crookea microsepala (Torr. & A. Gray) Small -- not accepted
  Croomia Torr. -- accepted -- croomia
  Croomia pauciflora (Nutt.) Torr. -- accepted -- croomia
  Croptilon divaricatum var. hookerianum (Torr. & A. Gray) Shinners -- not accepted
  Croptilon hookerianum (Torr. & A. Gray) House -- accepted -- Hooker's scratchdaisy
  Croptilon hookerianum var. hookerianum (Torr. & A. Gray) House -- accepted -- Hooker's scratchdaisy
  Croton arenosus Carn.-Torres & Cordeiro -- accepted
  Croton berlandieri Torr. -- not accepted
  Croton fruticulosus Torr. -- accepted -- bush croton, encinilla, hierba loca, shrubby croton
  Croton glandulosobracteatus Carn.-Torres & Cordeiro -- accepted
  Croton harleyi Carn.-Torres & Cordeiro -- accepted
  Croton sonorae Torr. -- accepted -- Sonoran croton
  Croton suaveolens Torr. -- accepted -- scented croton
  Croton suaveolens var. oblongifolius Torr. -- not accepted
  Croton trichocarpus Torr. -- not accepted
  Crusea tricocca (Torr. & A. Gray) A. Heller -- not accepted
  Cryptantha angustifolia (Torr.) Greene -- accepted -- bristlelobe cryptantha, narrowleaf pick-me-not, Panamint catseye, Panamint cryptantha
  Cryptantha cinerea var. jamesii (Torr.) Cronquist -- accepted -- James' catseye, James' cryptantha
  Cryptantha crassisepala (Torr. & A. Gray) Greene -- accepted -- deertongue, thick-sepal catseye, thicksepal cryptantha
  Cryptantha crassisepala var. crassisepala (Torr. & A. Gray) Greene -- accepted -- thicksepal catseye, thicksepal cryptantha
  Cryptantha jamesi (Torr.) Payson -- not accepted
  Cryptantha jamesii (Torr.) Payson -- not accepted
  Cryptantha jamesii var. multicaulis (Torr.) Payson -- not accepted
  Cryptantha micrantha (Torr.) I.M. Johnst. -- accepted -- purpleroot pick-me-not, redroot catseye, redroot cryptantha
  Cryptantha micrantha var. micrantha (Torr.) I.M. Johnst. -- accepted -- redroot catseye, redroot cryptantha
  Cryptantha pterocarya (Torr.) Greene -- accepted -- winged pick-me-not, wingnut catseye, wingnut cryptantha
  Cryptantha pterocarya var. pterocarya (Torr.) Greene -- accepted -- wingnut catseye, wingnut cryptantha
  Cryptantha pusilla (Torr. & A. Gray) Greene -- accepted -- low catseye, low cryptantha
  Cucurbita californica Torr. ex S. Watson -- not accepted
  Cyanococcus vacillans (Kalm ex Torr.) Rydb. -- not accepted
  Cyclanthera dissecta (Torr. & A. Gray) Arn. -- accepted -- cut-leaf cyclanthera, cutleaf cyclanthera
  Cylindropuntia californica (Torr. & A. Gray) F.M. Knuth -- accepted
  Cylindropuntia californica var. californica (Torr. & A. Gray) F.M. Knuth -- accepted
  Cymopterus montanus Nutt. ex Torr. & A. Gray -- accepted -- Montana wavewing, mountain springparsley
  Cymopterus terebinthinus (Hook.) Torr. & A. Gray -- not accepted
  Cymopterus terebinthinus var. albiflorus (Torr. & A. Gray) M.E. Jones -- not accepted
  Cymopterus terebinthinus var. foeniculaceus (Nutt. ex Torr. & A. Gray) Cronquist -- not accepted
  Cynoctonum angustifolium (Torr. & A. Gray) Small -- not accepted
  Cynoctonum sessilifolium var. angustifolium Torr. & A. Gray -- not accepted
  Cyperus acuminatus Torr. & Hook. ex Torr. -- accepted -- taper-tip flat sedge, taperleaf flatsedge, tapertip flatsedge
  Cyperus bipartitus Torr. -- accepted -- brook flatsedge, shining flat sedge, slender flatsedge
  Cyperus cephalanthus Torr. & Hook. -- accepted -- buttonbush flatsedge
  Cyperus dentatus Torr. -- accepted -- toothed flatsedge
  Cyperus diandrus Torr. -- accepted -- umbrella flat sedge, umbrella flatsedge
  Cyperus dissitiflorus Nees ex Torr. -- not accepted
  Cyperus drummondii Torr. & Hook. -- accepted -- Drummond's sedge
  Cyperus grayi Torr. -- accepted -- Gray's flatsedge
  Cyperus halei Torr. ex Britton -- not accepted
  Cyperus houghtonii Torr. -- accepted -- Houghton's flatsedge
  Cyperus lecontei Torr. ex Steud. -- accepted -- Le Conte's flatsedge
  Cyperus lutescens Torr. & Hook. -- not accepted
  Cyperus microdontus Torr. -- not accepted
  Cyperus ovularis (Michx.) Torr. -- not accepted
  Cyperus ovularis var. cylindricus (Elliott) Torr. -- not accepted
  Cyperus polystachyos var. texensis (Torr.) Fernald -- not accepted -- Texan flatsedge
  Cyperus retrofractus (L.) Torr. -- accepted -- rough flatsedge
  Cyperus schweinitzii Torr. -- accepted -- sand flat sedge, schweinitz flatsedge, Schweinitz's flatsedge
  Cyperus sesquiflorus (Torr.) Mattf. & Kük. -- not accepted
  Cyperus setigerus Torr. & Hook. -- accepted -- lean flatsedge
  Cyperus stenolepis Torr. -- not accepted
  Cyperus strigosus var. stenolepis (Torr.) Kük. -- not accepted
  Cyperus uniflorus Torr. & Hook., non Thunb. -- not accepted
  Cyperus virens var. drummondii (Torr. & Hook.) Kük. -- not accepted -- Drummond's flatsedge
  Dalea arborescens Torr. ex A. Gray -- not accepted
  Dalea candida var. oligophylla (Torr.) Shinners -- accepted -- white dalea, white prairie clover, white prairie-clover, white prairieclover
  Dalea carnea var. albida (Torr. & A. Gray) Barneby -- accepted -- whitetassels
  Dalea emarginata (Torr. & A. Gray) Shinners -- accepted -- wedgeleaf prairie clover, wedgeleaf prairieclover
  Dalea formosa Torr. -- accepted -- feather dalea, featherplume, feathery dalea
  Dalea fremontii Torr. ex A. Gray -- not accepted
  Dalea jamesii (Torr.) Torr. & A. Gray -- accepted -- James' dalea, James' prairie clover, James' prairieclover
  Dalea nana Torr. ex A. Gray -- accepted -- dwarf dalea, dwarf prairie clover, dwarf prairie-clover, dwarf prairieclover
  Dalea nana var. nana Torr. ex A. Gray -- accepted -- dwarf prairie clover, dwarf prairieclover
  Dalea obovata (Torr. & A. Gray) Shinners -- accepted -- pussyfoot
  Dalea oligophylla (Torr.) Shinners -- not accepted
  Dalea parryi Torr. & A. Gray -- not accepted
  Dalea phleoides (Torr. & A. Gray) Shinners -- accepted -- slimspike prairie clover, slimspike prairieclover
  Dalea phleoides var. microphylla (Torr. & A. Gray) Barneby -- accepted -- slimspike prairie clover, slimspike prairieclover
  Dalea phleoides var. phleoides (Torr. & A. Gray) Shinners -- accepted -- slimspike prairie clover, slimspike prairieclover
  Dalea polydenia Torr. ex S. Watson -- not accepted
  Dalea schottii Torr. -- not accepted
  Dalea villosa var. grisea (Torr. & A. Gray) Barneby -- accepted -- silky prairie clover, silky prairieclover
  Damasonium californicum Torr. -- accepted -- California damsonium
  Darlingtonia Torr. -- accepted -- California pitcherplant
  Darlingtonia californica Torr. -- accepted -- calf's head, California pitcherplant, cobra lily, cobra plant
  Darlingtonia californica f. californica Torr. -- not accepted
  Darlingtonia rediviva Torr. -- not accepted
  Darmera peltata (Torr. ex Benth.) Voss -- accepted -- Indian rhubarb
  Dasistoma serrata (Torr. ex Benth.) Small -- not accepted
  Datura innoxia var. quinquecuspidata (Torr.) A.S. Barclay -- not accepted
  Datura inoxia ssp. quinquecuspida (Torr.) A.S. Barclay -- not accepted -- pricklyburr
  Datura metel var. quinquecuspida Torr. -- not accepted
  Datura stramonium var. tatula (L.) Torr. -- not accepted
  Decodon verticillatus var. laevigatus Torr. & A. Gray -- not accepted
  Delphinium californicum Torr. & A. Gray -- accepted -- California larkspur
  Delphinium californicum ssp. californicum Torr. & A. Gray -- accepted -- California larkspur
  Delphinium nudicaule Torr. & A. Gray -- accepted -- red larkspur
  Delphinium variegatum Torr. & A. Gray -- accepted -- royal larkspur
  Delphinium variegatum ssp. variegatum Torr. & A. Gray -- accepted -- royal larkspur
  Desmanthus leptolobus Torr. & A. Gray -- accepted -- prairie bundleflower, slenderlobe bundleflower
  Desmodium bracteosum var. longifolium (Torr. & A. Gray) B.L. Rob. -- not accepted
  Desmodium canescens var. villosissimum Torr. & A. Gray -- not accepted
  Desmodium cuspidatum var. longifolium (Torr. & A. Gray) B.G. Schub. -- accepted -- largebract ticktrefoil
  Desmodium longifolium (Torr. & A. Gray) Smyth -- not accepted
  Desmodium paniculatum var. angustifolium Torr. & A. Gray -- not accepted
  Desmodium paniculatum var. pubens Torr. & A. Gray -- not accepted
  Desmodium sessilifolium (Torr.) Torr. & A. Gray -- accepted -- sessile tickclover, sessileleaf tickclover, sessileleaf ticktrefoil
  Desmodium tenuifolium Torr. & A. Gray -- accepted -- slimleaf ticktrefoil
  Dianthera parvifolia (Torr.) A. Gray -- not accepted
  Diaperia candida (Torr. & A. Gray) Benth. -- accepted -- silver pygmycudweed
  Diaperia drummondii (Torr. & A. Gray) Benth. -- not accepted
  Diaperia verna var. drummondii (Torr. & A. Gray) Morefield -- accepted -- spring pygmycudweed
  Dicentra eximia (Ker Gawl.) Torr. -- accepted -- turkey corn
  Dichanthelium acuminatum ssp. fasciculatum (Torr.) Freckmann & Lelong -- not accepted
  Dichanthelium acuminatum var. fasciculatum (Torr.) Freckmann -- accepted -- Huachuca panic, tapered rosette grass, western panicgrass
  Dichanthelium dichotomum var. ramulosum (Torr.) LeBlond -- accepted
  Dichanthelium lanuginosum var. fasciculatum (Torr.) Spellenb. -- not accepted
  Dichelostemma californicum (Torr.) Alph. Wood -- not accepted
  Dichelostemma capitatum ssp. pauciflorum (Torr.) Keator -- accepted -- bluedicks
  Dichelostemma pulchellum var. pauciflorum (Torr.) Hoover -- not accepted
  Dicoria Torr. ex A. Gray -- accepted -- dicoria, twinbugs
  Dieteria asteroides Torr. -- accepted -- fall tansyaster
  Dieteria asteroides var. asteroides Torr. -- accepted
  Dieteria incana (Lindl.) Torr. & A. Gray -- not accepted
  Dioclea multiflora (Torr. & A. Gray) C. Mohr -- accepted -- Boykin's clusterpea
  Diodia tricocca Torr. & A. Gray -- not accepted
  Diodia virginiana var. latifolia Torr. & A. Gray -- accepted -- Virginia buttonweed
  Dioon caputoi De Luca, Sabato & Vázq. Torres -- accepted
  Dioon edule var. sonorense (De Luca, Sabato & Vázq. Torres) McVaugh & Pérez de la Rosa -- not accepted
  Dioon holmgrenii De Luca, Sabato & Vázq. Torres -- accepted
  Dioon merolae De Luca, Sabato & Vázq. Torres -- accepted
  Dioon rzedowskii De Luca, A. Moretti, Sabato & Vázq. Torres -- accepted
  Dioon sonorense (De Luca, Sabato & Vázq. Torres) Chemnick, T.J. Greg. & Salas-Mor. -- accepted
  Dioon tomasellii De Luca, Sabato & Vázq. Torres -- accepted
  Dioon tomasellii var. sonorense De Luca, Sabato & Vázq. Torres -- not accepted
  Dioon tomasellii var. tomasellii De Luca, Sabato & Vázq. Torres -- not accepted
  Dipteracanthus linearis Torr. & A. Gray -- not accepted
  Disporum hookeri (Torr.) G. Nicholson -- not accepted -- drops of gold
  Disporum hookeri var. hookeri (Torr.) G. Nicholson -- not accepted -- drops of gold
  Disporum hookeri var. trachyandrum (Torr.) Q. Jones -- not accepted -- drops of gold
  Disporum trachyandrum (Torr.) Britton -- not accepted
  Distichlis marginata var. stricta (Torr.) Thurb. -- not accepted
  Distichlis maritima var. stricta (Torr.) Thurb. -- not accepted
  Distichlis spicata ssp. stricta (Torr.) Thorne -- accepted
  Distichlis spicata var. stricta (Torr.) Scribn. -- not accepted
  Distichlis spicata var. stricta (Torr.) Beetle -- not accepted
  Distichlis stricta (Torr.) Rydb. -- not accepted
  Distichlis stricta var. stricta (Torr.) Rydb. -- not accepted
  Ditaxis blodgettii (Torr.) Pax -- not accepted
  Ditaxis laevis (Torr.) A. Heller -- not accepted
  Ditaxis serrata (Torr.) A. Heller -- accepted -- California silverbush, New Mexico silverbush, Yuma silverbush
  Dolicholus latifolius (Nutt. ex Torr. & A. Gray) Vail -- not accepted
  Downingia Torr. -- accepted -- calicoflower
  Downingia elegans (Douglas ex Lindl.) Torr. -- accepted -- elegant calicoflower
  Downingia elegans var. elegans (Douglas ex Lindl.) Torr. -- not accepted -- elegant calicoflower
  Downingia puchella (Lindl.) Torr. -- not accepted
  Downingia pulchella (Lindl.) Torr. -- accepted -- flatface calicoflower
  Downingia pusilla (G. Don) Torr. -- accepted -- dwarf calicoflower
  Draba brachycarpa Nutt. ex Torr. & A. Gray -- accepted -- short-pod whitlowgrass, shortfruited draba, shortpod draba
  Draba cuneifolia Nutt. ex Torr. & A. Gray -- accepted -- wedgeleaf draba, wedgeleaf whitlowgrass
  Draba cuneifolia var. cuneifolia Nutt. ex Torr. & A. Gray -- accepted -- wedgeleaf draba, wedgeleaf whitlowgrass
  Draba cuneifolia var. platycarpa (Torr. & A. Gray) S. Watson -- not accepted
  Draba platycarpa Torr. & A. Gray -- accepted -- broad-pod whitlowgrass, broadpod draba, broadpod whitlowgrass
  Draperia Torr. -- accepted
  Draperia systula (A. Gray) Torr. -- not accepted
  Draperia systyla (A. Gray) Torr. -- accepted -- violet draperia
  Drejera juncea Torr. -- not accepted
  Drejera puberula Torr. -- not accepted
  Drejera thurberi Torr. -- not accepted
  Drejera wrightii Torr. -- not accepted
  Dyschoriste linearis (Torr. & A. Gray) Kuntze -- accepted -- narrowleaf dyschoriste, polkadots
  Dyschoriste linearis var. linearis (Torr. & A. Gray) Kuntze -- accepted -- polkadots
  Dysodiopsis tagetoides (Torr. & A. Gray) Rydb. -- accepted -- false dogfennel, marygold dogweed
  Dyssodia tagetoides Torr. & A. Gray -- not accepted
  Eatonia pensylvanica var. major (Torr.) A. Gray -- not accepted
  Echinocactus viridescens Torr. & A. Gray -- not accepted
  Echinocystis Torr. & A. Gray -- accepted
  Echinocystis lobata (Michx.) Torr. & A. Gray -- accepted -- wild balsamapple, wild cucumber, wild mock-cucumber, wild mockcucumber
  Echinocystis oregana (Torr. ex S. Watson) Cogn. -- not accepted
  Eddya hispidissima Torr. & A. Gray -- not accepted
  Elatine texana (Hook.) Torr. & A. Gray -- not accepted
  Eleocharis acicularis var. minima Torr. -- not accepted
  Eleocharis albida Torr. -- accepted -- white spikerush
  Eleocharis arenicola Torr. -- not accepted
  Eleocharis baldwinii (Torr.) Chapm. -- accepted -- Baldwin's spikerush
  Eleocharis calva Torr. -- not accepted
  Eleocharis cellulosa Torr. -- accepted -- Gulf Coast spikerush, Gulfcoast spikesedge
  Eleocharis equisetoides (Elliott) Torr. -- accepted -- jointed spikesedge
  Eleocharis flaccida var. olivacea (Torr.) Fernald & Griscom -- not accepted
  Eleocharis flavescens var. olivacea (Torr.) Gleason -- accepted -- bright green spikerush
  Eleocharis melanocarpa Torr. -- accepted -- blackfruit spikerush
  Eleocharis microcarpa Torr. -- accepted -- smallfruit spikerush
  Eleocharis microcarpa var. filiculmis Torr. -- accepted
  Eleocharis microcarpa var. microcarpa Torr. -- accepted
  Eleocharis olivacea Torr. -- not accepted -- bright green spikerush
  Eleocharis olivacea var. olivacea Torr. -- not accepted -- bright green spikerush
  Eleocharis parvula var. anachaeta (Torr.) Svenson -- not accepted
  Eleocharis prolifera Torr. -- not accepted
  Eleocharis rostellata (Torr.) Torr. -- accepted -- beaked spike-rush, beaked spikerush, beaked spikesedge
  Eleocharis tricostata Torr. -- accepted -- three-angle spikerush
  Elymus canadensis var. glaucifolius (Willd.) Torr. -- not accepted
  Elymus villosus var. glabriusculus Torr. -- not accepted
  Emorya Torr. -- accepted
  Emorya suaveolens Torr. -- accepted -- emorybush
  Empetrum conradii Torr. -- not accepted
  Emplectocladus fasciculatus Torr. -- not accepted
  Encelia farinosa A. Gray ex Torr. -- accepted -- brittlebush, goldenhills, white brittlebush
  Encelia farinosa var. farinosa A. Gray ex Torr. -- not accepted -- goldenhills
  Endolepis Torr. -- not accepted
  Ephedra trifurca Torr. ex S. Watson -- accepted -- longleaf ephedra, longleaf jointfir, longleaf Mormon tea
  Epilobium foliosum (Torr. & A. Gray) Suksd. -- accepted -- California willowherb, leafy willowherb
  Epilobium minutum var. foliosum Torr. & A. Gray -- not accepted
  Epilobium paniculatum Nutt. ex Torr. & A. Gray -- not accepted
  Epilobium paniculatum var. paniculatum Nutt. ex Torr. & A. Gray -- not accepted
  Eragrostis oxylepis (Torr.) Torr. -- not accepted
  Eragrostis secundiflora ssp. oxylepis (Torr.) S.D. Koch -- accepted -- red lovegrass
  Eremocarya angustifolia Torr. -- not accepted
  Eremocarya micrantha (Torr.) Greene -- not accepted
  Erigeron concinnus (Hook. & Arn.) Torr. & A. Gray -- accepted -- hairy daisy, Navajo fleabane
  Erigeron concinnus var. concinnus (Hook. & Arn.) Torr. & A. Gray -- accepted -- Navajo daisy, Navajo fleabane
  Erigeron divergens Torr. & A. Gray -- accepted -- spreading daisy, spreading fleabane
  Erigeron peregrinus ssp. callianthemus var. scaposus (Torr. & A. Gray) Cronquist -- not accepted -- subalpine fleabane
  Erigeron peregrinus var. scaposus (Torr. & A. Gray) Cronquist -- not accepted
  Erigeron strigosus var. beyrichii (Fisch. & C.A. Mey.) Torr. & A. Gray ex A. Gray -- not accepted -- Beyrich's fleabane
  Erigeron tenuis Torr. & A. Gray -- accepted -- slender fleabane, slenderleaf fleabane
  Erigeron vernus (L.) Torr. & A. Gray -- accepted -- early whitetop fleabane
  Eriodictyon californicum (Hook. & Arn.) Torr. -- accepted -- California yerba santa
  Eriogonum abertianum Torr. -- accepted -- Abert's buckwheat
  Eriogonum abertianum var. abertianum Torr. -- not accepted -- Abert's buckwheat
  Eriogonum alatum Torr. -- accepted -- wing eriogonum, winged buckwheat
  Eriogonum alatum var. alatum Torr. -- accepted -- winged buckwheat
  Eriogonum alatum var. glabriusculum Torr. -- accepted -- winged buckwheat
  Eriogonum brachypodum Torr. & A. Gray -- accepted -- Parry's buckwheat, Parry's wild buckwheat
  Eriogonum brevicaule var. laxifolium (Torr. & A. Gray) Reveal -- accepted -- goldenball eriogonum, shortstem buckwheat
  Eriogonum cernuum ssp. tenue (Torr. & A. Gray) S. Stokes -- not accepted
  Eriogonum cernuum var. tenue Torr. & A. Gray -- not accepted
  Eriogonum corymbosum var. divaricatum Torr. & A. Gray -- not accepted
  Eriogonum dasyanthemum Torr. & A. Gray -- accepted -- chaparral buckwheat
  Eriogonum deflexum Torr. -- accepted -- flatcrown buckwheat, skeletonweed, skeletonweed buckwheat
  Eriogonum deflexum ssp. watsonii (Torr. & A. Gray) S. Stokes -- not accepted
  Eriogonum deflexum var. brachypodum (Torr. & A. Gray) Munz -- not accepted
  Eriogonum deflexum var. deflexum Torr. -- accepted -- flatcrown buckwheat
  Eriogonum deflexum var. watsonii (Torr. & A. Gray) R.J. Davis -- not accepted
  Eriogonum effusum var. leptophyllum Torr. -- not accepted
  Eriogonum ericifolium Torr. & A. Gray -- accepted -- Yavapai buckwheat, Yavapai County buckwheat
  Eriogonum ericifolium var. ericifolium Torr. & A. Gray -- not accepted -- Yavapai buckwheat, Yavapai County buckwheat
  Eriogonum fasciculatum var. polifolium (Benth.) Torr. & A. Gray -- accepted -- Eastern Mojave buckwheat, flattop buckwheat, Mojave buckwheat
  Eriogonum greggii Torr. & A. Gray -- accepted -- Gregg's buckwheat
  Eriogonum hemipterum (Torr.) S. Stokes -- accepted -- Chisos Mountain buckwheat
  Eriogonum hemipterum var. hemipterum (Torr.) S. Stokes -- accepted -- Chisos Mountain buckwheat
  Eriogonum heracleoides var. angustifolium (Nutt.) Torr. & A. Gray -- not accepted -- parsnipflower buckwheat
  Eriogonum incanum Torr. & A. Gray -- accepted -- frosted buckwheat
  Eriogonum inflatum Torr. & Frém. -- accepted -- desert trumpet, Native American pipeweed
  Eriogonum inflatum var. inflatum Torr. & Frém. -- not accepted -- desert trumpet, Native American buckwheat
  Eriogonum kingii Torr. & A. Gray -- accepted -- Ruby Mountain buckwheat
  Eriogonum lachnogynum Torr. ex Benth. -- accepted -- woolly-cup wild buckwheat, woollycup buckwheat
  Eriogonum lachnogynum var. lachnogynum Torr. ex Benth. -- accepted -- woollycup buckwheat
  Eriogonum leptocladon Torr. & A. Gray -- accepted -- fine branched buckwheat, sand buckwheat
  Eriogonum leptocladon var. leptocladon Torr. & A. Gray -- accepted -- sand buckwheat
  Eriogonum leptophyllum (Torr. & A. Gray) Wooton & Standl. -- accepted -- slender-leaf buckwheat, slenderleaf buckwheat
  Eriogonum lobbii Torr. & A. Gray -- accepted -- granite buckwheat, Lobb's buckwheat
  Eriogonum lobbii var. lobbii Torr. & A. Gray -- not accepted -- Lobb's buckwheat
  Eriogonum lonchophyllum Torr. & A. Gray -- accepted -- spearleaf buckwheat, spreading wild buckwheat
  Eriogonum lonchophyllum var. lonchophyllum Torr. & A. Gray -- not accepted -- spearleaf buckwheat
  Eriogonum lonchophyllum var. nudicaule (Torr.) Reveal -- not accepted -- spearleaf buckwheat
  Eriogonum marifolium Torr. & A. Gray -- accepted -- marumleaf buckwheat
  Eriogonum marifolium var. incanum (Torr. & A. Gray) M.E. Jones -- not accepted
  Eriogonum marifolium var. marifolium Torr. & A. Gray -- accepted -- marumleaf buckwheat
  Eriogonum microthecum var. confertiflorum (Benth.) Torr. & A. Gray -- not accepted
  Eriogonum microthecum var. effusum (Nutt.) Torr. & A. Gray -- not accepted
  Eriogonum microthecum var. foliosum (Torr. & A. Gray) Reveal -- not accepted
  Eriogonum niveum var. decumbens (Benth.) Torr. & A. Gray -- not accepted
  Eriogonum nudicaule (Torr.) Small -- not accepted
  Eriogonum nutans Torr. & A. Gray -- accepted -- drooping buckwheat, Dugway buckwheat
  Eriogonum nutans var. nutans Torr. & A. Gray -- accepted -- Dugway buckwheat
  Eriogonum pharnaceoides Torr. -- accepted -- ginseng buckwheat, wirestem buckwheat
  Eriogonum pharnaceoides var. pharnaceoides Torr. -- accepted -- wirestem buckwheat
  Eriogonum platyphyllum Torr. -- not accepted -- tall buckwheat
  Eriogonum proliferum Torr. & A. Gray -- not accepted
  Eriogonum pusillum Torr. & A. Gray -- accepted -- puny buckwheat, yellow-turbans, yellowturbans
  Eriogonum pyrolifolium var. coryphaeum Torr. & A. Gray -- accepted -- Shasta buckwheat
  Eriogonum reniforme Torr. & Frém. -- accepted -- kidneyleaf buckwheat
  Eriogonum reniforme ssp. pusillum (Torr. & A. Gray) S. Stokes -- not accepted
  Eriogonum strictum ssp. proliferum (Torr. & A. Gray) S. Stokes -- not accepted -- Blue Mountain buckwheat
  Eriogonum strictum ssp. proliferum var. proliferum (Torr. & A. Gray) C.L. Hitchc. -- not accepted -- Blue Mountain buckwheat
  Eriogonum strictum var. proliferum (Torr. & A. Gray) C.L. Hitchc. -- accepted -- Blue Mountain buckwheat
  Eriogonum tenellum Torr. -- accepted -- matted wildbuckwheat, tall buckwheat
  Eriogonum tenellum var. caulescens Torr. & A. Gray -- not accepted
  Eriogonum tenellum var. platyphyllum (Torr. ex Benth.) Torr. -- accepted -- tall buckwheat
  Eriogonum tenellum var. tenellum Torr. -- accepted -- tall buckwheat
  Eriogonum thomasii Torr. -- accepted -- Thomas' buckwheat
  Eriogonum thurberi Torr. -- accepted -- Thurber's buckwheat, Thurber's wild buckwheat
  Eriogonum trichopes Torr. -- accepted -- little desert trumpet, little deserttrumpet
  Eriogonum trichopes var. trichopes Torr. -- not accepted -- little deserttrumpet
  Eriogonum truncatum Torr. & A. Gray -- accepted -- Contra Costa buckwheat, Mt. Diablo buckwheat
  Eriogonum umbellatum Torr. -- accepted -- sulfur buckwheat, sulfur eriogonum, sulphur flower buckwheat, sulphur wildbuckwheat, sulphur-flower buckwheat
  Eriogonum umbellatum ssp. bahiiforme (Torr. & A. Gray) Munz -- not accepted
  Eriogonum umbellatum var. bahiiforme (Torr. & A. Gray) Jeps. -- accepted -- sulphur-flower buckwheat
  Eriogonum umbellatum var. monocephalum Torr. & A. Gray -- not accepted
  Eriogonum umbellatum var. umbellatum Torr. -- accepted -- sulphur-flower buckwheat
  Eriogonum watsonii Torr. & A. Gray -- accepted -- Watson's buckwheat
  Eriogonum wrightii Torr. ex Benth. -- accepted -- bastardsage, shrubby buckwheat, Wright's buckwheat
  Eriogonum wrightii ssp. trachygonum (Torr. ex Benth.) S. Stokes -- not accepted
  Eriogonum wrightii var. trachygonum (Torr. ex Benth.) Jeps. -- accepted -- bastardsage, shrubby buckwheat
  Eriogonum wrightii var. wrightii Torr. ex Benth. -- accepted -- bastardsage, shrubby buckwheat, Wright's bastardsage
  Eritrichium pusillum Torr. & A. Gray -- not accepted
  Eryngium diffusum Torr. -- accepted -- bushy eryngo, spreading eryngo
  Eryngium leavenworthii Torr. & A. Gray -- accepted -- Leavenworth's eryngo
  Erythraea beyrichii Torr. & A. Gray -- not accepted
  Eucrypta chrysanthemifolia var. bipinnatifida (Torr.) Constance -- accepted -- spotted eucrypta, spotted hideseed
  Eucrypta micrantha (Torr.) A. Heller -- accepted -- dainty desert hideseed, desert eucrypta, desert hideseed
  Eulobus Nutt. ex Torr. & A. Gray -- accepted
  Eulobus californicus Nutt. ex Torr. & A. Gray -- accepted -- California suncup
  Euonymus occidentale Nutt. ex Torr. -- not accepted -- western burning bush, western wahoo
  Euonymus occidentale var. occidentale Nutt. ex Torr. -- not accepted -- western burning bush
  Euonymus occidentalis Nutt. ex Torr. -- accepted -- western burning bush, western burningbush, western wahoo
  Euonymus occidentalis var. occidentalis Nutt. ex Torr. -- accepted -- western burning bush
  Eupatorium lancifolium (Torr. & A. Gray) Small -- accepted -- lanceleaf thoroughwort
  Eupatorium leucolepis (DC.) Torr. & A. Gray -- accepted -- justiceweed
  Eupatorium leucolepis var. leucolepis (DC.) Torr. & A. Gray -- accepted -- justiceweed
  Eupatorium resinosum Torr. ex DC. -- accepted -- pine barren thoroughwort
  Eupatorium rotundifolium var. ovatum (Bigelow) Torr. -- accepted -- roundleaf thoroughwort
  Eupatorium semiserratum var. lancifolium Torr. & A. Gray -- not accepted
  Eupatorium texense (Torr. & A. Gray) Rydb. -- not accepted
  Euphorbia albomarginata Torr. & A. Gray -- accepted -- Rattlesnake weed, white-margin sandmat, white-margin sandwort, whitemargin sandmat
  Euphorbia depressa Torr. ex Spreng. -- not accepted
  Euphorbia dilatata Torr. & A. Gray -- not accepted
  Euphorbia fendleri Torr. & A. Gray -- accepted -- Fendler's sandmat
  Euphorbia flaviana Carn.-Torres & Cordeiro -- accepted
  Euphorbia hirsuta (Torr.) Wiegand -- not accepted
  Euphorbia hirsuta var. subglabra (Gren. & Godr.) Nebot, De la Torrek, Mateo & Alcaraz -- not accepted
  Euphorbia hypericifolia var. hirsuta Torr. -- not accepted
  Euphorbia inundata Torr. ex Chapm. -- accepted -- Florida pineland spurge
  Euphorbia inundata var. inundata Torr. ex Chapm. -- accepted -- Florida pineland spurge
  Euphorbia leptocera Engelm. ex Torr. -- not accepted
  Euphorbia melanadenia Torr. & A. Gray -- accepted -- prostrate spurge, red-gland spurge, squaw sandmat
  Euphorbia pseudonutans var. hirsuta (Torr.) Farw. -- not accepted
  Euphorbia setiloba Engelm. ex Torr. -- accepted -- fringed spurge, shaggy spurge, Yuma sandmat
  Euphorbia wrightii Torr. & A. Gray -- accepted -- Wright's spurge
  Eurybia chapmanii (Torr. & A. Gray) G.L. Nesom -- not accepted -- savannah aster
  Eurybia eryngiifolia (Torr. & A. Gray) G.L. Nesom -- accepted -- thistleleaf aster
  Eurybia mirabilis (Torr. & A. Gray) G.L. Nesom -- accepted -- bouquet aster
  Eurytaenia Torr. & A. Gray -- accepted -- spreadwing
  Eurytaenia texana Torr. & A. Gray -- accepted -- Texas spreadwing
  Euthamia leptocephala (Torr. & A. Gray) Greene ex Porter & Britton -- accepted -- bushy goldentop
  Evax candida (Torr. & A. Gray) A. Gray -- not accepted -- silver evax, silver pygmycudweed
  Evax multicaulis var. drummondii (Torr. & A. Gray) A. Gray -- not accepted
  Evax verna var. drummondii (Torr. & A. Gray) Kartesz & Gandhi -- not accepted -- spring pygmycudweed
  Evolvulus alsinoides var. angustifolius Torr. -- accepted -- dwarf morningglory, slender dwarf morning-glory
  Evolvulus alsinoides var. hirticaulis Torr. -- not accepted
  Evolvulus alsinoides var. hiticaulis Torr. -- not accepted
  Falcata pitcheri (Torr. & A. Gray) Kuntze -- not accepted
  Fallugia paradoxa (D. Don) Endl. ex Torr. -- accepted -- Apache plume
  Ferocactus viridescens (Torr. & A. Gray) Britton & Rose -- accepted -- Biznaga-barril verdosa, coast barrel cactus, San Diego barrel cactus
  Festuca acutiflora (Torr.) Bigelow -- not accepted
  Festuca altaica ssp. scabrella (Torr.) Hultén -- not accepted
  Festuca altaica var. aristulata (Torr.) St.-Yves -- not accepted
  Festuca altaica var. scabrella (Torr.) Breitung -- not accepted
  Festuca aristulata (Torr.) Shear ex Piper -- not accepted
  Festuca aristulata var. aristulata (Torr.) Shear ex Piper -- not accepted
  Festuca macrostachya Torr. & A. Gray -- not accepted
  Festuca octoflora var. aristulata Torr. ex L.H. Dewey -- not accepted
  Festuca scabrella Torr. -- not accepted
  Festuca scabrella ssp. scabrella Torr. -- not accepted
  Festuca scabrella var. scabrella Torr. -- not accepted
  Festuca tenella var. aristulata Torr. -- not accepted
  Filaginopsis drummondii Torr. & A. Gray -- not accepted
  Filaginopsis multicaulis (DC.) Torr. & A. Gray -- not accepted
  Filago candida (Torr. & A. Gray) Shinners -- not accepted
  Filago verna var. drummondii (Torr. & A. Gray) Shinners -- not accepted
  Fimbristylis baldwiniana (Schult.) Torr. -- not accepted
  Fimbristylis drummondii (Torr. & Hook. ex Torr.) Boeckeler -- not accepted
  Fimbristylis puberula var. drummondii (Torr. & Hook.) D.B. Ward -- not accepted
  Forestiera angustifolia Torr. -- accepted -- narrowleaf forestiera, Texas forestiera, Texas swampprivet
  Forestiera phillyreoides (Benth.) Torr. -- not accepted -- desert-olive forestiera
  Forestiera reticulata Torr. -- accepted -- netleaf forestiera, netleaf swampprivet
  Forestiera sphaerocarpa Torr. -- not accepted
  Frankenia jamesii Torr. ex A. Gray -- accepted -- frank bush, James' seaheath
  Franseria deltoidea Torr. -- not accepted
  Frasera paniculata Torr. -- accepted -- tufted elkweed, tufted frasera, Utah elkweed
  Frasera parryi Torr. -- accepted -- Coahuila frasera
  Fraxinus anomala Torr. ex S. Watson -- accepted -- singleleaf ash
  Fraxinus anomala var. amonala Torr. ex S. Watson -- not accepted
  Fraxinus anomala var. anomala Torr. ex S. Watson -- accepted -- singleleaf ash
  Fraxinus cuspidata Torr. -- accepted -- fragrant ash
  Fraxinus dipetala var. trifoliolata Torr. -- not accepted
  Fraxinus pennsylvanica ssp. velutina (Torr.) G.N. Mill. -- not accepted
  Fraxinus trifoliata (Torr.) F.H. Lewis & Epling -- not accepted
  Fraxinus trifoliolata (Torr.) F.H. Lewis & Epling -- not accepted
  Fraxinus velutina Torr. -- accepted -- velvet ash
  Fremontia californica Torr. -- not accepted
  Fremontodendron californicum (Torr.) Coville -- accepted -- California flannelbush, California fremontia, flannelbush
  Fremontodendron californicum ssp. californicum (Torr.) Coville -- not accepted -- California flannelbush, flannelbush
  Fritillaria kamtschatcensis Torr. -- not accepted
  Fritillaria liliacea Torr. -- not accepted
  Fritillaria parviflora Torr. -- not accepted
  Fritillaria pluriflora Torr. ex Benth. -- accepted -- adobe lily, adobe-lily
  Fuirena pumila (Torr.) Spreng. -- accepted -- dwarf umbrella-sedge, dwarf umbrellasedge
  Fuirena simplex var. aristulata (Torr.) Kral -- accepted -- western umbrella-sedge, western umbrellasedge
  Fuirena squarrosa var. aristulata Torr. -- not accepted
  Fuirena squarrosa var. pumila Torr. -- not accepted
  Funastrum cynanchoides ssp. heterophyllum (Engelm. ex Torr.) Kartesz -- not accepted -- Hartweg's twinevine
  Funastrum heterophyllum (Engelm. ex Torr.) Standl. -- not accepted
  Gaillardia pinnatifida Torr. -- accepted -- blanketflower, red dome blanketflower, red-dome blanketflower, slender gaillardia, yellow blanketflower
  Gaillardia pinnatifida var. pinnatifida Torr. -- not accepted -- red dome blanketflower
  Galactia brachypoda Torr. & A. Gray -- not accepted
  Galactia elliottii var. leavenworthii Torr. & A. Gray -- not accepted
  Galactia floridana Torr. & A. Gray -- accepted -- Florida milkpea
  Galactia spiciformis Torr. & A. Gray -- not accepted
  Galarhoeus inundatus (Torr. ex Chapm.) Small -- not accepted
  Galium angustifolium Nutt. ex Torr. & A. Gray -- accepted -- narrowleaf bedstraw
  Galium californicum var. texanum Torr. & A. Gray -- not accepted
  Galium circaezans var. lanceolatum (Torr.) Torr. & A. Gray -- not accepted
  Galium concinnum Torr. & A. Gray -- accepted -- shining bedstraw
  Galium lanceolatum Torr. -- accepted -- lanceleaf wild licorice
  Galium pilosum var. puncticulosum (Michx.) Torr. & A. Gray -- accepted -- hairy bedstraw
  Galium rotundifolium var. lanceolatum (Torr.) Kuntze -- not accepted
  Galium strictum Torr. -- not accepted
  Galium texanum (Torr. & A. Gray) Wiegand -- not accepted
  Galium trifidum var. latifolium Torr. -- not accepted
  Galium trifidum var. tinctorium (L.) Torr. & A. Gray -- not accepted
  Galium virgatum var. leiocarpum Torr. & A. Gray -- not accepted
  Galpinsia lavandulifolia (Torr. & A. Gray) Small -- not accepted
  Garrya fremonti Torr. -- not accepted
  Garrya fremontii Torr. -- accepted -- bearbrush
  Garrya lindheimeri Torr. -- not accepted
  Garrya ovata ssp. lindheimeri (Torr.) Dahling -- accepted -- eggleaf silktassel, Lindheimer's silktassel
  Garrya wrightii Torr. -- accepted -- Wright's silktassel
  Gaura biennis var. pitcheri Torr. & A. Gray -- not accepted
  Gaura coccinea var. parvifolia (Torr.) Rickett -- not accepted
  Gaura drummondii (Spach) Torr. & A. Gray -- not accepted -- Drummond's beeblossom, scented gaura
  Gaura filipes var. major Torr. & A. Gray -- not accepted
  Gaura heterandra Torr. -- not accepted
  Gaura pitcheri (Torr. & A. Gray) Small -- not accepted
  Gaura villosa Torr. -- not accepted -- woolly beeblossom, woolly gaura
  Gaura villosa ssp. villosa Torr. -- not accepted -- woolly beeblossom
  Gaurella canescens (Torr. & Frém.) A. Nelson -- not accepted
  Gaylussacia dumosa (Andrews) Torr. & A. Gray -- accepted -- dwarf huckleberry
  Gaylussacia dumosa var. dumosa (Andrews) Torr. & A. Gray -- not accepted -- dwarf huckleberry
  Gaylussacia frondosa (L.) Torr. & A. Gray -- accepted -- blue huckleberry, dangleberry
  Gaylussacia frondosa var. frondosa (L.) Torr. & A. Gray -- not accepted
  Gaylussacia ursina (M.A. Curtis) Torr. & A. Gray -- accepted -- bear huckleberry
  Gayophytum diffusum Torr. & A. Gray -- accepted -- bigflower groundsmoke, spreading groundsmoke
  Gayophytum diffusum ssp. diffusum Torr. & A. Gray -- accepted -- spreading groundsmoke
  Gayophytum nuttallii Torr. & A. Gray -- not accepted
  Gayophytum racemosum Torr. & A. Gray -- accepted -- black-foot groundsmoke, blackfoot groundsmoke
  Gayophytum racemosum var. caesium (Torr. & A. Gray) Munz -- not accepted
  Gayophytum ramosissimum Torr. & A. Gray -- accepted -- muchbranched groundsmoke, pinyon groundsmoke
  Gentiana fremontii Torr. -- accepted -- moss gentian
  Geraea Torr. & A. Gray -- accepted -- desert sunflower, desertsunflower
  Geraea canescens Torr. & A. Gray -- accepted -- desert sunflower, desertgold, hairy desertsunflower
  Geraea canescens var. canescens Torr. & A. Gray -- not accepted -- hairy desert sunflower, hairy desertsunflower
  Geranium caespitosum var. fremontii (Torr. ex A. Gray) Dorn -- not accepted -- Fremont's geranium
  Geranium fremontii Torr. ex A. Gray -- not accepted
  Geranium viscosissimum var. incisum (Torr. & A. Gray) N.H. Holmgren -- accepted -- sticky purple geranium
  Gerardia barbata (Torr. & A. Gray) S.F. Blake -- not accepted
  Gerardia grandiflora var. serrata (Torr. ex Benth.) B.L. Rob. -- not accepted
  Geum vernum (Raf.) Torr. & A. Gray -- accepted -- heartleaf avens, spring avens
  Gilia gunnisonii Torr. & A. Gray -- not accepted
  Gilia longiflora (Torr.) G. Don -- not accepted
  Gilia macombii Torr. ex A. Gray -- not accepted
  Gilia polycladon Torr. -- not accepted
  Gilia pungens (Torr.) Benth. -- not accepted
  Gilia subnuda Torr. ex A. Gray -- not accepted -- Canyon Lands gilia, coral gilia, coral gily-flower
  Gilia thurberi (Torr. ex A. Gray) A. Gray -- not accepted
  Glyceria acutiflora Torr. -- accepted -- creeping mannagrass
  Glyceria americana (Torr.) Pammel -- not accepted
  Glyceria elongata (Torr.) Trin. -- not accepted
  Glyceria maxima var. americana (Torr.) B. Boivin -- not accepted
  Glyceria pallida (Torr.) Trin. -- not accepted
  Glyceria pallida var. pallida (Torr.) Trin. -- not accepted
  Glycosma occidentalis Nutt. ex Torr. & A. Gray -- not accepted
  Gnaphalium purpureum var. falcatum (Lam.) Torr. & A. Gray -- not accepted
  Godetia epilobioides (Nutt. ex Torr. & A. Gray) S. Watson -- not accepted
  Gomphrena caespitosa Torr. -- accepted -- tufted ball clover, tufted globe amaranth
  Gomphrena sonorae Torr. -- accepted -- Sonoran globe amaranth, Sonoran globe-amaranth
  Gomphrena tuberifera Torr. -- not accepted
  Gonolobus parvifolius Torr. -- not accepted
  Gonolobus productus Torr. -- not accepted
  Gratiola neglecta Torr. -- accepted -- clammy hedge-hyssop, clammy hedgehyssop, drug hedgehyssop, hedge hyssop, neglected hedgehyssop
  Guincula lobata (Torr.) Raf. -- not accepted
  Gutierrezia californica (DC.) Torr. & A. Gray -- accepted -- California snakeweed, San Joaquin snakeweed
  Gutierrezia texana (DC.) Torr. & A. Gray -- accepted -- Texas broomweed, Texas snakeweed
  Gutierrezia texana var. texana (DC.) Torr. & A. Gray -- accepted -- Texas snakeweed
  Habenaria grandiflora (Bigelow) Torr. -- not accepted
  Habenaria hookeri Torr. ex A. Gray -- not accepted
  Halea ludoviciana Torr. & A. Gray -- not accepted
  Hamosa leptocarpa (Torr. & A. Gray) Rydb. -- not accepted
  Haplopappus alpigenus Torr. & A. Gray -- not accepted
  Haplopappus divaricatus var. hookerianus (Torr. & A. Gray) Waterf. -- not accepted
  Haplopappus drummondii (Torr. & A. Gray) S.F. Blake -- not accepted
  Haplopappus lanceolatus (Hook.) Torr. & A. Gray -- not accepted
  Haplopappus lanceolatus var. lanceolatus (Hook.) Torr. & A. Gray -- not accepted
  Haplopappus nuttallii Torr. & A. Gray -- not accepted
  Haplopappus pluriflorus (Torr. & A. Gray) H.M. Hall -- not accepted
  Haplopappus pygmaeus (Torr. & A. Gray) A. Gray -- not accepted
  Haplopappus racemosus (Nutt.) Torr. -- not accepted
  Haplopappus racemosus var. racemosus (Nutt.) Torr. -- not accepted
  Haplopappus uniflorus (Hook.) Torr. & A. Gray -- not accepted
  Haplopappus uniflorus var. uniflorus (Hook.) Torr. & A. Gray -- not accepted
  Hedeoma dentata Torr. -- accepted -- dentate false pennyroyal, dentate falsepennyroyal
  Hedeoma dentatum Torr. -- not accepted
  Hedeoma incana Torr. -- not accepted
  Hedeoma molle Torr. -- not accepted
  Hedeoma mollis Torr. -- accepted -- falsepennyroyal, softhair false pennyroyal
  Hedeoma nana (Torr.) Briq. -- accepted -- dwarf false pennyroyal, dwarf pennyroyal, false pennyroyal
  Hedeoma nana ssp. nana (Torr.) Briq. -- accepted -- dwarf false pennyroyal, false pennyroyal, falsepennyroyal
  Hedeoma nanum (Torr.) Briq. -- not accepted
  Hedeoma nanum var. namum (Torr.) Briq. -- not accepted
  Hedeoma plicata Torr. -- accepted -- falsepennyroyal, veiny false pennyroyal
  Hedeoma plicatum Torr. -- not accepted
  Hedeoma serpylloides Torr. -- not accepted
  Hedyotis caerulea var. minor (Michx.) Torr. & A. Gray -- not accepted
  Hedyotis halei Torr. & A. Gray -- not accepted
  Hedyotis longifolia var. ciliolata (Torr.) Mohlenbr. -- not accepted
  Hedyotis longifolia var. tenuifolia (Nutt.) Torr. & A. Gray -- not accepted
  Hedyotis minima (Beck) Torr. & A. Gray -- not accepted
  Hedyotis purpurea (L.) Torr. & A. Gray -- not accepted
  Hedyotis purpurea var. ciliolata (Torr.) Fosberg -- not accepted
  Helenium autumnale var. canaliculatum (Lam.) Torr. & A. Gray -- not accepted
  Helenium autumnale var. grandiflorum (Nutt.) Torr. & A. Gray -- not accepted -- fall sneezeweed
  Helenium incisum (Torr. & A. Gray) Alph. Wood -- not accepted
  Helianthella Torr. & A. Gray -- accepted -- helianthella
  Helianthella grandiflora Torr. & A. Gray -- not accepted
  Helianthella tenuifolia Torr. & A. Gray -- not accepted
  Helianthella uniflora (Nutt.) Torr. & A. Gray -- accepted -- oneflower helianthella
  Helianthella uniflora var. douglasii (Torr. & A. Gray) W.A. Weber -- not accepted -- Douglas' helianthella
  Helianthella uniflora var. uniflora (Nutt.) Torr. & A. Gray -- not accepted -- oneflower helianthella
  Helianthemum scoparium Nutt. ex Torr. & A. Gray -- accepted -- Bisbee Peak rushrose
  Helianthus argophyllis Torr. & A. Gray -- not accepted
  Helianthus argophyllus Torr. & A. Gray -- accepted -- silverleaf sunflower
  Helianthus cinereus var. sullivantii Torr. & A. Gray -- not accepted
  Helianthus cucumerifolius Torr. & A. Gray -- not accepted
  Helianthus debilis ssp. cucumerifolius (Torr. & A. Gray) Heiser -- accepted -- cucumberleaf sunflower
  Helianthus debilis var. cucumerifolius (Torr. & A. Gray) A. Gray -- not accepted
  Helianthus hirsutus var. stenophyllus Torr. & A. Gray -- not accepted
  Helianthus hirsutus var. trachyphyllus Torr. & A. Gray -- not accepted
  Helianthus laevigatus Torr. & A. Gray -- accepted -- smooth sunflower
  Helianthus microcephalus Torr. & A. Gray -- accepted -- small woodland sunflower
  Helianthus nuttallii Torr. & A. Gray -- accepted -- Nuttall's sunflower
  Helianthus nuttallii ssp. nuttallii Torr. & A. Gray -- accepted -- Nuttall's sunflower
  Helianthus occidentalis ssp. plantagineus (Torr. & A. Gray) Shinners -- accepted -- fewleaf sunflower, Gewleaf sunflower
  Helianthus occidentalis var. dowellianus (M.A. Curtis) Torr. & A. Gray -- not accepted
  Helianthus occidentalis var. plantagineus Torr. & A. Gray -- not accepted
  Helianthus radula (Pursh) Torr. & A. Gray -- accepted -- rayless sunflower, stiff sunflower
  Helianthus schweinitzii Torr. & A. Gray -- accepted -- Schweinitz's sunflower
  Helianthus stenophyllus (Torr. & A. Gray) E.E. Watson -- not accepted
  Helianthus X cinereus Torr. & A. Gray (pro sp.) -- accepted -- sunflower
  Heliotropium angustifolium Torr. -- not accepted
  Heliotropium confertifolium (Torr.) Torr. ex A. Gray -- accepted -- leafy heliotrope
  Heliotropium glabriusculum (Torr.) A. Gray -- accepted -- greeneye heliotrope
  Heliotropium greggii Torr. -- accepted -- fragrant heliotrope
  Heliotropium leavenworthii Torr. -- not accepted
  Heliotropium molle (Torr.) I.M. Johnst. -- accepted -- soft heliotrope
  Heliotropium phyllostachum Torr. -- not accepted
  Heliotropium phyllostachyum Torr. -- not accepted
  Heliotropium tenellum (Nutt.) Torr. -- accepted -- pasture heliotrope
  Hemizonia corymbosa (DC.) Torr. & A. Gray -- not accepted -- coastal tarweed
  Hemizonia corymbosa ssp. corymbosa (DC.) Torr. & A. Gray -- not accepted -- coastal tarweed
  Hemizonia fasciculata (DC.) Torr. & A. Gray -- not accepted -- clustered tarweed
  Hemizonia pugens (Hook. & Arn.) Torr. & A. Gray -- not accepted
  Hemizonia pugens var. pugens (Hook. & Arn.) Torr. & A. Gray -- not accepted
  Hemizonia pungens (Hook. & Arn.) Torr. & A. Gray -- not accepted -- common spikeweed, common tarweed, spikeweed
  Hemizonia pungens ssp. pungens (Hook. & Arn.) Torr. & A. Gray -- not accepted -- common tarweed, spikeweed
  Hesperaloe parviflora (Torr.) J.M. Coult. -- accepted -- redflower false yucca, redflower falseyucca, Samandoque flor roja
  Hesperaloe parviflora var. parviflora (Torr.) J.M. Coult. -- not accepted -- redflower false yucca, smallflower falseyucca
  Hesperocnide Torr. -- accepted -- stingingnettle
  Hesperocnide tenella Torr. -- accepted -- western nettle, western stingingnettle
  Hesperoscordium maritimum Torr. -- not accepted
  Hesperoscordum maritimum Torr. -- not accepted
  Hesperoyucca whipplei (Torr.) Baker -- accepted -- chaparral yucca
  Heterogaura heterandra (Torr.) Coville -- not accepted
  Heterotheca graminifolia var. tenuifolia (Torr.) Gandhi & R.D. Thomas -- not accepted
  Heterotheca oligantha (Chapm. ex Torr. & A. Gray) V.L. Harms -- not accepted
  Heterotheca scabrella (Torr. & A. Gray) V.L. Harms -- not accepted
  Heuchera bracteata (Torr.) Ser. -- accepted -- bracted alumroot, Rocky Mountain alumroot
  Heuchera curtisii Torr. & A. Gray ex A. Gray -- not accepted
  Heuchera cylindrica var. glabella (Torr. & A. Gray) Wheelock -- not accepted -- beautiful alumroot
  Heuchera cylindrica var. ovalifolia (Torr. & A. Gray) Wheelock -- not accepted
  Heuchera glabella Torr. & A. Gray -- not accepted
  Heuchera ovalifolia Torr. & A. Gray -- not accepted
  Heuchera parvifolia Nutt. ex Torr. & A. Gray -- accepted -- common alumroot, little-leaf alumroot, littleleaf alumroot
  Heuchera parvifolia var. parvifolia Nutt. ex Torr. & A. Gray -- not accepted -- littleleaf alumroot
  Heuchera rubescens Torr. -- accepted -- pink alumroot
  Heuchera rubescens var. rubescens Torr. -- not accepted -- pink alumroot
  Heyderia decurrens (Torr.) K. Koch -- not accepted
  Hibiscus moscheutos var. occidentalis Torr. -- not accepted
  Hieracium longipilum Torr. -- accepted -- hairy hawkweed, longbeard hawkweed
  Hilaria jamesii (Torr.) Benth. -- accepted
  Hoffmannseggia drummondii Torr. & A. Gray -- accepted -- dwarf nicker
  Hoffmannseggia jamesii Torr. & A. Gray -- not accepted
  Hoffmannseggia microphylla Torr. -- accepted -- wand holdback
  Hoita rhombifolia (Torr.) Rydb. -- not accepted
  Holcophacos distortus (Torr. & A. Gray) Rydb. -- not accepted
  Honckenya oblongifolia Torr. & A. Gray -- not accepted
  Horkelia fusca var. tenuiloba Torr. -- not accepted
  Horkelia multifoliolata Torr. -- not accepted
  Horkelia tenuiloba (Torr.) A. Gray -- accepted -- Santa Rosa horkelia
  Horkelia tridentata Torr. -- accepted -- threetooth horkelia
  Horkelia tridentata ssp. tridentata Torr. -- not accepted -- threetooth horkelia
  Horkelia tridentata var. tridentata Torr. -- accepted -- threetooth horkelia
  Hosackia glabra (Vogel) Torr. -- not accepted
  Hosackia incana Torr. -- accepted -- woolly bird's-foot trefoil
  Hosackia subpinnata auct. non (Lag.) Torr. & A. Gray -- not accepted
  Houstonia ciliolata Torr. -- not accepted
  Hulsea Torr. & A. Gray -- accepted -- alpinegold, hulsea
  Hulsea californica Torr. & A. Gray -- accepted -- San Diego alpinegold
  Hunzikeria texana (Torr.) D'Arcy -- accepted -- Texas cupflower
  Hybanthus linearis (Torr.) Shinners -- not accepted
  Hydrangea arborescens var. oblonga Torr. & A. Gray -- not accepted
  Hydrangea arborescens var. sterilis Torr. & A. Gray -- not accepted
  Hydrochloa fluitans (Michx.) Torr. -- not accepted
  Hydrophila drummondii (Torr. & A. Gray) House -- not accepted
  Hydrophila drummondii sensu (Torr. & A. Gray) House -- not accepted
  Hymenatherum tagetoides (Torr. & A. Gray) A. Gray -- not accepted
  Hymenoclea Torr. & A. Gray ex A. Gray -- accepted -- burrobrush
  Hymenoclea monogyla Torr. & A. Gray -- not accepted
  Hymenoclea monogyra Torr. & A. Gray -- not accepted -- cheeseweed burrobrush, singlewhorl burrobrush, singlewhorl burrobush
  Hymenoclea salsola Torr. & A. Gray -- not accepted -- burrobrush, white burrobrush
  Hymenoclea salsola var. salsola Torr. & A. Gray -- not accepted -- burrobrush, white burrobrush
  Hymenopappus corymbosus Torr. & A. Gray -- not accepted
  Hymenopappus scabiosaeus var. corymbosus (Torr. & A. Gray) B.L. Turner -- accepted -- Carolina woollywhite
  Hymenoxys depressa (Torr. & A. Gray ex A. Gray) S.L. Welsh & Reveal -- not accepted
  Hymenoxys grandiflora (Torr. & A. Gray ex A. Gray) K.F. Parker -- accepted -- graylocks four-nerve daisy, graylocks hymenoxys
  Hypericum drummondii (Grev. & Hook.) Torr. & A. Gray -- accepted -- Drummond's St. Johnswort, nits and lice
  Hypericum microsepalum (Torr. & A. Gray) A. Gray ex S. Watson -- accepted -- flatwoods St. Johnswort
  Hypericum opacum Torr. & A. Gray -- not accepted
  Hyptis emoryi Torr. -- accepted -- desert lavender
  Ilex ambigua (Michx.) Torr. -- accepted -- Carolina holly
  Ilex ambigua var. montana (Torr. & A. Gray ex A. Gray) H.E. Ahles -- not accepted
  Ilex montana Torr. & A. Gray ex A. Gray -- accepted -- mountain holly, mountain winterberry
  Ilex verticillata var. padifolia (Willd.) Torr. & A. Gray ex S. Watson -- not accepted
  Ilex verticillata var. tenuifolia (Torr.) S. Watson -- not accepted
  Iliamna acerifolia (Nutt. ex Torr. & A. Gray) Greene -- not accepted
  Iliamna longisepala (Torr.) Wiggins -- accepted -- longsepal wild hollyhock
  Indigofera leptosepala Nutt. ex Torr. & A. Gray -- not accepted
  Indigofera miniata var. leptosepala (Nutt. ex Torr. & A. Gray) B.L. Turner -- not accepted -- western indigo
  Inula ericoides Torr. -- not accepted
  Iodanthus (Torr. & A. Gray) Steud. -- accepted
  Iodanthus dentatus (Torr.) Greene -- not accepted
  Iodanthus hesperidioides (Torr. & A. Gray) A. Gray -- not accepted
  Ipomoea costellata Torr. -- accepted -- crestrib morning-glory, crestrib morningglory
  Ipomoea leptophylla Torr. -- accepted -- bush morning-glory, bush morningglory
  Ipomoea leptotoma Torr. -- not accepted
  Ipomoea leptotoma var. leptotoma Torr. -- not accepted -- pink morningglory
  Ipomoea shumardiana (Torr.) Shinners -- accepted -- narrowleaf morning-glory, narrowleaf morningglory
  Ipomoea tenuiloba Torr. -- accepted -- spiderleaf
  Ipomoea tenuiloba var. tenuiloba Torr. -- accepted -- spiderleaf
  Ipomoea ternifolia var. leptotoma (Torr.) J.A. McDonald -- accepted -- pink morningglory, tripleleaf morning-glory
  Ipomopsis gunnisonii (Torr. & A. Gray) V.E. Grant -- accepted -- sand-dune skyrocket, sanddune ipomopsis, sanddune skyrocket
  Ipomopsis longiflora (Torr.) V.E. Grant -- accepted -- flaxflowered gilia, flaxflowered ipomopsis, white-flower skyrocket, whiteflowered gilia
  Ipomopsis longiflora ssp. longiflora (Torr.) V.E. Grant -- accepted -- flaxflowered gilia, flaxflowered ipomopsis
  Ipomopsis macombii (Torr. ex A. Gray) V.E. Grant -- accepted -- Macomb's ipomopsis, Macomb's skyrocket
  Ipomopsis polycladon (Torr.) V.E. Grant -- accepted -- manybranched gilia, manybranched ipomopsis, sprawling skyrocket
  Ipomopsis thurberi (Torr. ex A. Gray) V.E. Grant -- accepted -- El Paso skyrocket, Thurber skyrocket
  Iris douglasiana var. major Torr. -- not accepted
  Iris macrosiphon Torr. -- accepted -- bowltube iris
  Isnardia spathulata (Torr. & A. Gray) Small -- not accepted
  Isocoma drummondii (Torr. & A. Gray) Greene -- accepted -- Drummond's goldenbush, Drummond's goldenweed, Drummond's jimmyweed
  Isocoma pluriflora (Torr. & A. Gray) Greene -- accepted -- rayless goldenrod, southern goldenbush, southern jimmyweed
  Isolepis carinata Hook. & Arn. ex Torr. -- accepted -- keeled bulrush
  Isolepis cernua var. californica (Torr.) Kartesz -- not accepted
  Isolepis warei Torr. -- not accepted
  Isopappus divaricatus (Nutt.) Torr. & A. Gray -- not accepted
  Isopappus hookerianus Torr. & A. Gray -- not accepted
  Isopyrum biternatum (Raf.) Torr. & A. Gray -- not accepted
  Isotrema californica (Torr.) Huber -- not accepted
  Isotrema californicum (Torr.) Huber -- not accepted
  Ivesia Torr. & A. Gray -- accepted -- mousetail
  Ivesia gordanii (Hook.) Torr. & A. Gray -- not accepted
  Ivesia gordonii (Hook.) Torr. & A. Gray -- accepted -- Gordon's ivesia
  Ivesia gordonii var. gordonii (Hook.) Torr. & A. Gray -- accepted -- Gordon's ivesia
  Ivesia gracilis Torr. & A. Gray -- not accepted
  Ivesia multifoliata (Torr.) D.D. Keck -- not accepted
  Ivesia multifoliolata (Torr.) D.D. Keck -- accepted -- manyleaf mousetail
  Ivesia pickeringii Torr. ex A. Gray -- accepted -- Pickering ivesia, silky mousetail
  Jacksonia tenuifolia (Torr. & A. Gray) Greene -- not accepted
  Jamesia Torr. & A. Gray -- accepted -- cliffbush
  Jamesia americana Torr. & A. Gray -- accepted -- cliff Jamesia, cliffbush, fivepetal cliffbush
  Jamesia americana var. americana Torr. & A. Gray -- accepted -- fivepetal cliffbush
  Janipha manihot var. angustiloba Torr. -- not accepted
  Jarava durifolia (Parodi ex Torres) Peńailillo -- accepted
  Jarava scabrifolia (Torres) Peńailillo -- accepted
  Jatropha cardiophylla (Torr.) Müll. Arg. -- accepted -- sangre de cristo
  Jepsonia parryi (Torr.) Small -- accepted -- coast jepsonia, Parry's jepsonia
  Juglans major (Torr.) A. Heller -- accepted -- Arizona black walnut, Arizona walnut, New Mexico walnut
  Juglans major var. major (Torr.) A. Heller -- accepted -- Arizona walnut
  Juglans microcarpa var. major (Torr.) L.D. Benson -- not accepted
  Juglans rupestris Engelm. ex Torr. -- not accepted
  Juglans rupestris var. major Torr. -- not accepted
  Juncus longistylis Torr. -- accepted -- long-style rush, long-styled rush
  Juncus longistylis var. longistylis Torr. -- not accepted -- long-style rush, longstyle rush
  Juncus longistylus Torr. -- not accepted
  Juncus marginatus var. odoratus Torr. -- not accepted
  Juniperus californica ssp. osteosperma (Torr.) A.E. Murray -- not accepted
  Juniperus californica var. osteosperma (Torr.) L.D. Benson -- not accepted
  Juniperus californica var. osterosperma (Torr.) Little -- not accepted
  Juniperus deppeana var. pachyphlaea (Torr.) Martínez -- not accepted -- enebro aborí
  Juniperus osteosperma (Torr.) Little -- accepted -- Utah juniper
  Juniperus virginiana var. prostrata (Pers.) Torr. -- not accepted
  Kallstroemia grandiflora Torr. ex A. Gray -- accepted -- Arizona poppy, orange caltrop
  Keckiella ternata (Torr. ex A. Gray) Straw -- accepted -- scarlet keckiella
  Keckiella ternata ssp. ternata (Torr. ex A. Gray) Straw -- accepted -- scarlet keckiella
  Keckiella ternata var. ternata (Torr. ex A. Gray) Straw -- not accepted
  Kelloggia Torr. ex Benth. -- accepted
  Kelloggia galioides Torr. -- accepted -- milk kelloggia, milky kelloggia
  Kobresia bipartita (All.) Dalla Torre -- not accepted
  Koeleria canescens Torr. ex Trin. -- not accepted
  Koeleria pensylvanica var. major (Torr.) Torr. -- not accepted
  Koeleria truncata (Muhl.) Torr. -- not accepted
  Koeleria truncata var. major Torr. -- not accepted
  Koellia albescens (Torr. & A. Gray) Kuntze -- not accepted
  Koellia clinopodioides (Torr. & A. Gray) Kuntze -- not accepted
  Krameria lanceolata Torr. -- accepted -- spreading ratany, trailing krameria, trailing ratany
  Kraunhia macrostachya (Torr. & A. Gray) Small -- not accepted
  Krynitzkia crassisepala (Torr. & A. Gray) A. Gray -- not accepted
  Krynitzkia jamesii (Torr.) A. Gray -- not accepted
  Kuhnia eupatorioides var. corymbulosa Torr. & A. Gray -- not accepted
  Kuhnia eupatorioides var. gracilis Torr. & A. Gray -- not accepted
  Kyllinga sesquiflora Torr. -- not accepted
  Lacinaria boykinii (Torr. & A. Gray) Kuntze -- not accepted
  Lacinaria chapmanii (Torr. & A. Gray) Kuntze -- not accepted
  Lactuca canadensis var. integrifolia (Bigelow) Torr. & A. Gray -- not accepted
  Lactuca hirsuta var. albiflora (Torr. & A. Gray) Shinners -- not accepted -- hairy lettuce
  Lactuca spicata var. integrifolia (Torr. & A. Gray) Britton -- not accepted
  Langloisia schottii (Torr.) Greene -- not accepted
  Langloisia setosissima (Torr. & A. Gray ex Torr.) Greene -- accepted -- Great Basin langloisia, moth langloisia
  Langloisia setosissima ssp. setosissima (Torr. & A. Gray ex Torr.) Greene -- accepted -- Great Basin langloisia
  Lantana macropoda Torr. -- not accepted
  Laphamia bisetosa Torr. ex A. Gray -- not accepted
  Laphamia dissecta Torr. -- not accepted
  Lappula fremontii (Torr.) Greene -- not accepted
  Lasthenia fremontii (Torr. ex A. Gray) Greene -- accepted -- Fremont's goldfields
  Lathyrus venosus var. grandiflorus Torr. -- not accepted
  Layia carnosa (Nutt.) Torr. & A. Gray -- accepted -- beach layia, beach tidytips
  Layia fremontii (Torr. & A. Gray) A. Gray -- accepted -- Fremont's tidytips
  Leavenworthia Torr. -- accepted -- gladecress
  Leavenworthia aurea Torr. -- accepted -- golden gladecress, golden yelloweye
  Leavenworthia aurea var. aurea Torr. -- not accepted -- golden gladecress
  Leavenworthia michauxii Torr. -- not accepted
  Leiostemon ambiguus (Torr.) Greene -- not accepted
  Lemna perpusilla Torr. -- accepted -- minute duckweed
  Lepachys columnaris (Pursh) Torr. & A. Gray -- not accepted
  Lepachys peduncularis Torr. & A. Gray -- not accepted
  Lepachys pinnata (Vent.) Torr. & A. Gray -- not accepted
  Lepidium flavum Torr. -- accepted -- yellow pepperweed
  Lepidium flavum var. flavum Torr. -- not accepted -- yellow pepperweed
  Lepidium oxycarpum Torr. & A. Gray -- accepted -- forked pepperweed
  Lepitoma brevifolia Torr. ex Steud. -- not accepted
  Leptodactylon pungens (Torr.) Torr. ex Nutt. -- not accepted -- common prickly gilia, granite gilia, granite prickly gilia, granite prickly phlox
  Leptodactylon pungens var. pungens (Torr.) Torr. ex Nutt. -- not accepted
  Leptoglossis texana (Torr.) A. Gray -- not accepted
  Leptopoda fimbriata Torr. & A. Gray non Leptopoda fimbriata (Michx.) Eaton -- not accepted
  Lespedeza capitata var. vulgaris Torr. & A. Gray -- not accepted
  Lespedeza hirta var. sparsiflora Torr. & A. Gray -- not accepted
  Lesquerella angustifolia (Nutt. ex Torr. & A. Gray) S. Watson -- not accepted -- annual bladderpod, thread-leaved bladderpod, threadleaf bladderpod
  Lesquerella gracilis ssp. nuttallii (Torr. & A. Gray) Rollins & E.A. Shaw -- not accepted -- Nuttall's bladderpod
  Lesquerella nuttallii (Torr. & A. Gray) S. Watson -- not accepted
  Lesquerella pallida (Torr. & A. Gray) S. Watson -- not accepted -- white bladderpod
  Leucelene ericoides (Torr.) Greene -- not accepted
  Leucothoe davisiae Torr. ex A. Gray -- accepted -- Sierra laurel
  Levenworthia Torr. -- not accepted
  Levenworthia aurea Torr. -- not accepted
  Liatris chapmanii Torr. & A. Gray -- accepted -- Chapman's blazing star
  Liatris compacta (Torr. & A. Gray) Rydb. -- accepted -- scaly blazing star
  Liatris squarrosa var. compacta Torr. & A. Gray -- not accepted -- scaly blazing star
  Liatris X boykinii Torr. & A. Gray (pro sp.) -- accepted -- Boykin's gayfeather
  Libocedrus decurrens Torr. -- not accepted -- cedro de incienso
  Ligusticum apiifolium (Nutt. ex Torr. & A. Gray) A. Gray -- accepted -- celeryleaf licorice-root
  Linanthus pungens (Torr.) J.M. Porter & L.A. Johnson -- accepted -- granite prickly phlox
  Linnaea borealis ssp. longiflora (Torr.) Hultén -- not accepted -- longtube twinflower
  Linnaea borealis var. longiflora Torr. -- accepted -- longtube twinflower
  Linosyris texana Torr. & A. Gray -- not accepted
  Linum rigidum var. berlandieri (Hook.) Torr. & A. Gray -- not accepted
  Lipocarpha maculata (Michx.) Torr. -- accepted -- American halfchaff sedge
  Lippia cuneifolia (Torr.) Steud. -- not accepted
  Lithophragma (Nutt.) Torr. & A. Gray -- accepted -- woodland-star
  Lithophragma cymbalaria Torr. & A. Gray -- accepted -- mission woodland-star
  Lithospermum multiflorum Torr. ex A. Gray -- accepted -- manyflowered gromwell, manyflowered stoneseed, purple pucoon
  Lobelia boykinii Torr. & A. Gray ex A. DC. -- accepted -- Boykin's lobelia
  Loeseliastrum schottii (Torr.) Timbrook -- accepted -- Schott's calico
  Lomatium bicolor var. leptocarpum (Torr. & A. Gray) Schlessman -- accepted -- Wasatch desert parsley, Wasatch desertparsley, Wasatch lomatium
  Lomatium dasycarpum (Torr. & A. Gray) J.M. Coult. & Rose -- accepted -- woollyfruit desertparsley
  Lomatium dasycarpum ssp. dasycarpum (Torr. & A. Gray) J.M. Coult. & Rose -- accepted -- woollyfruit desertparsley
  Lomatium daucifolium (Torr. & A. Gray) J.M. Coult. & Rose -- not accepted
  Lomatium divaricatum (Pursh) Nutt. ex Torr. & A. Gray -- not accepted
  Lomatium foeniculaceum ssp. daucifolium (Torr. & A. Gray) W.L. Theob. -- accepted -- carrot-leaf desert-parsley, desert biscuitroot
  Lomatium foeniculaceum var. daucifolium (Torr. & A. Gray) Cronquist -- not accepted
  Lomatium leptocarpum (Torr. & A. Gray) J.M. Coult. & Rose -- not accepted
  Lomatium lucidum (Nutt. ex Torr. & A. Gray) Jeps. -- accepted -- shiny biscuitroot
  Lomatium macrocarpum (Nutt. ex Torr. & A. Gray) J.M. Coult. & Rose -- accepted -- bigseed biscuitroot, bigseed lomatium, large-fruit desert-parsley, largefruit biscuitroot, long mamma
  Lomatium macrocarpum var. ellipticum (Torr. & A. Gray) Jeps. -- not accepted
  Lomatium platycarpum (Torr.) J.M. Coult. & Rose -- not accepted
  Lomatium tenuifolium Nutt. ex Torr. & A. Gray -- not accepted
  Lomatium triternatum ssp. platycarpum (Torr.) Cronquist -- not accepted
  Lomatium utriculatum (Nutt. ex Torr. & A. Gray) J.M. Coult. & Rose -- accepted -- common lomatium
  Lonicera albiflora Torr. & A. Gray -- accepted -- western white honeysuckle, white honeysuckle
  Lonicera caerulea var. villosa (Michx.) Torr. & A. Gray -- not accepted
  Lonicera hispidula (Lindl.) Douglas ex Torr. & A. Gray -- accepted -- pink honeysuckle
  Lonicera hispidula var. hispidula (Lindl.) Douglas ex Torr. & A. Gray -- accepted -- pink honeysuckle
  Lotus incanus (Torr.) Greene -- not accepted -- woolly bird's-foot trefoil
  Ludwigia cylindrica var. brachycarpa Torr. & A. Gray -- not accepted
  Ludwigia glandulosa ssp. brachycarpa (Torr. & A. Gray) C.I. Peng -- accepted -- cylindricfruit primrose-willow
  Ludwigia spathulata Torr. & A. Gray -- accepted -- spoon primrose-willow
  Lupinus argenteus var. decumbens (Torr.) S. Watson -- not accepted
  Lupinus decumbens Torr. -- not accepted
  Lupinus falcifer Nutt. ex Torr. & A. Gray (pro. syn.) -- not accepted
  Lupinus foliosus (Torr. & A. Gray) Nutt. ex Hook. -- not accepted
  Lupinus laxiflorus var. foliosus Torr. & A. Gray -- not accepted
  Lupinus laxiflorus var. tenellus (Douglas ex G. Don) Torr. & A. Gray -- not accepted
  Lupinus nanus ssp. latifolius (Benth. ex Torr.) D.B. Dunn -- accepted -- sky lupine
  Lupinus nanus var. latifolius Benth. ex Torr. -- not accepted
  Lupinus polyphyllus ssp. polyphyllus var. grandifolius (Lindl. ex J. Agardh) Torr. & A. Gray -- not accepted -- bigleaf lupine
  Lupinus polyphyllus var. grandifolius (Lindl. ex J. Agardh) Torr. & A. Gray -- accepted -- bigleaf lupine
  Lupinus trifidus Torr. ex S. Watson -- not accepted
  Lupinus villosus var. diffusus (Nutt.) Torr. & A. Gray -- not accepted
  Lygodesma grandiflora (Nutt.) Torr. & A. Gray -- not accepted
  Lygodesmia aphylla var. texana Torr. & A. Gray -- not accepted
  Lygodesmia grandiflora (Nutt.) Torr. & A. Gray -- accepted -- largeflower skeletonplant, largeflower skeletonweed, rush-pink
  Lygodesmia grandiflora var. grandiflora (Nutt.) Torr. & A. Gray -- accepted
  Lygodesmia pauciflora (Torr.) Shinners -- not accepted
  Lygodesmia texana (Torr. & A. Gray) Greene -- accepted -- Texas skeletonplant
  Lyonia fruticosa (Michx.) G.S. Torr. -- accepted -- coastal plain staggerbush
  Lysias hookeriana (Torr. ex A. Gray) Rydb. -- not accepted
  Lysimachia loomisii Torr. -- accepted -- Loomis' yellow loosestrife
  Lythrum alatum var. lanceolatum (Elliott) Torr. & A. Gray ex Rothr. -- accepted -- winged lythrum
  Lythrum californicum Torr. & A. Gray -- accepted -- California loosestrife
  Machaeranthera asteroides (Torr.) Greene -- not accepted
  Machaeranthera asteroides var. asteroides (Torr.) Greene -- not accepted -- New Mexico tansyaster
  Machaeranthera tortifolia (Torr. & A. Gray) Cronquist & D.D. Keck -- not accepted
  Machaerocarpus californicus (Torr.) Small -- not accepted -- California damsonium
  Macroptilium supinum (Wiggins & Rollins) A. Delgado & L. Torres -- accepted -- supine bean
  Macrosiphonia brachysiphon (Torr.) A. Gray -- not accepted -- Huachuca Mountain rocktrumpet
  Macrosiphonia lanuginosa var. macrosiphon (Torr.) Henrickson -- not accepted -- plateau rocktrumpet
  Macrosiphonia macrosiphon (Torr.) A. Heller -- not accepted
  Madia dissitiflora (Nutt.) Torr. & A. Gray -- not accepted
  Madia sativa var. congesta Torr. & A. Gray -- not accepted
  Mahonia fremontii (Torr.) Fedde -- not accepted -- Fremont's barberry, Fremont's mahonia
  Malacothamnus fasciculatus (Nutt. ex Torr. & A. Gray) Greene -- accepted -- Mendocino bushmallow
  Malacothamnus fremontii (Torr. ex A. Gray) Torr. ex Greene -- accepted -- Fremon's bushmallow
  Malacothrix incana (Nutt.) Torr. & A. Gray -- accepted -- dunedelion
  Malacothrix saxatilis (Nutt.) Torr. & A. Gray -- accepted -- cliff desert dandelion, cliff desertdandelion
  Malacothrix saxatilis var. commutata (Torr. & A. Gray) Ferris -- accepted -- cliff desertdandelion
  Malacothrix saxatilis var. saxatilis (Nutt.) Torr. & A. Gray -- accepted -- cliff desertdandelion
  Malacothrix sonchoides (Nutt.) Torr. & A. Gray -- accepted -- sowthistle desert dandelion, sowthistle desertdandelion, yellow-saucers
  Malacothrix tenuifolia (Nutt.) Torr. & A. Gray -- not accepted
  Malva fasciculata Nutt. ex Torr. & A. Gray -- not accepted
  Malvastrum americanum (L.) Torr. -- accepted -- Indian Valley false mallow
  Malvastrum fasciculatum (Nutt. ex Torr. & A. Gray) Greene -- not accepted
  Malvastrum fremontii Torr. ex A. Gray -- not accepted
  Malvaviscus arboreus var. drummondii (Torr. & A. Gray) Schery -- accepted -- wax mallow
  Malvaviscus drummondii Torr. & A. Gray -- not accepted
  Mandevilla brachysiphon (Torr.) Pichon -- accepted -- Huachuca Mountain rocktrumpet
  Mandevilla macrosiphon (Torr.) Pichon -- accepted -- plateau rocktrumpet
  Manihot angustiloba (Torr.) Müll. Arg. -- accepted -- desertmountain manihot, narrow-leaf cassava
  Marah oregana (Torr. ex A. Gray) Howell -- accepted -- coastal manroot, western wildcucumber
  Marah oreganus (Torr. ex A. Gray) Howell -- not accepted -- coastal manroot, western wildcucumber
  Marina parryi (Torr. & A. Gray) Barneby -- accepted -- Parry dalea, Parry's false prairie-clover, Parry's indigobush
  Mariscus schweinitzii (Torr.) T. Koyama -- not accepted
  Matelea parviflora (Torr.) Woodson -- accepted -- smallflower milkvine
  Matelea parvifolia (Torr.) Woodson -- accepted -- littleleaf matelea, small-leaf anglepod, spearleaf
  Matelea producta (Torr.) Woodson -- accepted -- Texas milkvine
  Meconella californica Torr. & Frém. -- accepted -- California fairypoppy, Canada mint
  Megalodonta beckii (Torr. ex Spreng.) Greene -- not accepted -- Beck's watermarigold
  Megalodonta beckii var. beckii (Torr. ex Spreng.) Greene -- not accepted -- Beck's watermarigold
  Megastachya oxylepis (Torr.) E. Fourn. -- not accepted
  Meibomia longifolia (Torr. & A. Gray) Vail -- not accepted
  Meibomia pubens (Torr. & A. Gray) Rydb. -- not accepted
  Meibomia sessilifolia (Torr.) Kuntze -- not accepted
  Meibomia tenuifolia (Torr. & A. Gray) Kuntze -- not accepted
  Melampodium leucanthum Torr. & A. Gray -- accepted -- plains blackfoot, plains blackfoot daisy
  Melanobatus leucodermis (Douglas ex Torr. & A. Gray) Greene -- not accepted
  Melica eremophila Torres -- accepted
  Melica glabrescens (Torres) Torres -- accepted
  Melica imperfecta var. sesquiflora Torr. ex Scribn. -- not accepted
  Melica parodiana Torres -- accepted
  Melica purpurascens (Torr.) Hitchc. -- not accepted
  Melica sarmentosa var. monticola Torres -- accepted
  Melica violacea var. glabrescens Torres -- not accepted
  Mentzelia albicaulis (Douglas ex Hook.) Douglas ex Torr. & A. Gray -- accepted -- white blazingstar, white-stemmed evening-star, whitestem blazingstar, whitestem stickleaf
  Mentzelia albicaulis var. albicaulis (Hook.) Torr. & A. Gray -- not accepted -- whitestem blazingstar
  Mentzelia congesta Nutt. ex Torr. & A. Gray -- accepted -- united blazingstar, Ventana blazingstar
  Mentzelia congesta var. congesta Nutt. ex Torr. & A. Gray -- not accepted -- Ventana blazingstar
  Mentzelia floridana Nutt. ex Torr. & A. Gray -- accepted -- poorman's patch
  Mentzelia gracilenta Torr. & A. Gray -- accepted -- grass blazingstar
  Mentzelia laevicaulis (Hook.) Torr. & A. Gray -- accepted -- blazingstar mentzelia, smoothstem blazingstar
  Mentzelia laevicaulis var. laevicaulis (Hook.) Torr. & A. Gray -- accepted -- smoothstem blazingstar
  Mentzelia lindleyi Torr. & A. Gray -- accepted -- Lindley's blazingstar
  Mentzelia micrantha (Hook. & Arn.) Torr. & A. Gray -- accepted -- San Luis blazingstar
  Mentzelia nuda (Pursh) Torr. & A. Gray -- accepted -- bractless blazingstar, goodmother, stickleaf mentzelia
  Mentzelia nuda var. nuda (Pursh) Torr. & A. Gray -- accepted -- bractless blazingstar
  Mentzelia pumila Nutt. ex Torr. & A. Gray -- accepted -- dwarf blazingstar, dwarf mentzelia, golden blazingstar
  Mentzelia pumila var. pumila Nutt. ex Torr. & A. Gray -- accepted -- dwarf mentzelia, dwarf stickleaf, golden blazingstar
  Mertensia alpina (Torr.) G. Don -- accepted -- alpine bluebells
  Mertensia ciliata (James ex Torr.) G. Don -- accepted -- mountain bluebells, shortstyle bluebells, tall fringe bluebells, tall fringed bluebells
  Mertensia ciliata var. ciliata (James ex Torr.) G. Don -- accepted -- tall fringe bluebells, tall fringed bluebells
  Mesadenia diversifolia (Torr. & A. Gray) Greene -- not accepted
  Micranthes tolmiei (Torr. & A. Gray) Brouillet & Gornall -- accepted -- alpine saxifrage, Tolmie's saxifrage
  Micromonolepis pusilla (Torr. ex S. Watson) Ulbr. -- accepted -- small povertyweed
  Miegia arundinacea Torr. ex Munro -- not accepted
  Mikania scandens var. pubescens (Nutt.) Torr. & A. Gray -- not accepted
  Milium pungens Torr. -- not accepted
  Miltitzia glandulifera (Torr. ex S. Watson) A. Heller -- not accepted
  Mimosa quadrivalvis var. angustata (Torr. & A. Gray) Barneby -- not accepted
  Mimosa strigillosa Torr. & A. Gray -- accepted -- herbaceous mimosa, powderpuff
  Mimulus geyeri Torr. -- not accepted
  Mimulus glabratus var. jamesii (Torr. & A. Gray ex Benth.) A. Gray -- accepted -- James' monkeyflower
  Mimulus jamesii Torr. & A. Gray ex Benth. -- not accepted
  Minuartia douglasii (Fenzl ex Torr. & A. Gray) Mattf. -- accepted -- Douglas' stitchwort
  Minuartia douglasii var. douglasii (Fenzl ex Torr. & A. Gray) Mattf. -- not accepted -- Douglas' stitchwort
  Mirabilis coccinea (Torr.) Benth. & Hook. f. -- accepted -- red four-o'clock, scarlet four o'clock, scarlet four-o'clock
  Mirabilis multiflora (Torr.) A. Gray -- accepted -- Colorado four o'clock, Colorado four-o'clock, manyflowered four-o'clock
  Mirabilis multiflora var. multiflora (Torr.) A. Gray -- accepted -- Colorado four o'clock
  Mitreola angustifolia (Torr. & A. Gray) J.B. Nelson -- not accepted
  Mitreola petiolata (J.F. Gmel.) Torr. & A. Gray -- accepted -- lax hornpod
  Momisia pallida (Torr.) Planch. -- not accepted
  Monarda humilis (Torr.) Prather & J.A. Keith -- accepted
  Monardella douglasii ssp. venosa (Torr.) Jokerst -- accepted -- veiny monardella
  Monardella douglasii var. venosa (Torr.) Jeps. -- not accepted -- veiny monardella
  Monardella nana ssp. leptosiphon (Torr.) Abrams -- accepted -- San Felipe monardella
  Monardella sheltonii (Torr.) Howell -- accepted -- Shelton's monardella
  Monardella villosa ssp. sheltonii (Torr.) Epling -- not accepted
  Monolepis pusilla Torr. ex S. Watson -- not accepted -- small monolepis, small povertyweed
  Monoptilon Torr. & A. Gray -- accepted -- desertstar, monoptilon
  Monoptilon bellidiforme Torr. & A. Gray ex A. Gray -- accepted -- daisy desertstar, Mojave desertstar
  Monotropa hypopithys var. rubra (Torr.) Farw. -- not accepted
  Monotropa hypopitys var. rubra (Torr.) Farw. -- not accepted
  Monroa Torr. -- not accepted -- false buffalograss
  Monroa squarrosa (Nutt.) Torr. -- not accepted -- false buffalo grass, false buffalograss
  Montia heterophylla (Torr. & A. Gray) Jeps. -- not accepted
  Montia perfoliata ssp. glauca (Nutt. ex Torr. & A. Gray) Ferris -- not accepted
  Montia sibirica var. heterophylla (Torr. & A. Gray) B.L. Rob. -- not accepted
  Montia spathulata var. exigua (Torr. & A. Gray) B.L. Rob. -- not accepted
  Montia spathulata var. tenuifolia (Torr. & A. Gray) Munz -- not accepted
  Morongia angustata (Torr. & A. Gray) Britton -- not accepted
  Mozinna cardiophylla Torr. -- not accepted
  Muehlenbergia utilis (Torr.) Hitchc. -- not accepted
  Muhlenbergia ambigua Torr. -- not accepted
  Muhlenbergia ambigua var. ambigua Torr. -- not accepted
  Muhlenbergia ambigua var. filiformis (Torr.) Farw. -- not accepted
  Muhlenbergia cuspidata (Torr. ex Hook.) Rydb. -- accepted -- plains muhly
  Muhlenbergia foliosa f. ambigua (Torr.) Wiegand -- not accepted
  Muhlenbergia foliosa ssp. ambigua (Torr.) Scribn. -- not accepted
  Muhlenbergia gracillima Torr. -- not accepted
  Muhlenbergia mexicana f. ambigua (Torr.) Fernald -- not accepted
  Muhlenbergia mexicana var. filiformis (Torr.) Scribn. -- accepted
  Muhlenbergia sylvatica (Torr.) Torr. ex A. Gray -- accepted -- forest muhly, woodland muhly
  Muhlenbergia sylvatica f. sylvatica (Torr.) Torr. ex A. Gray -- not accepted
  Muhlenbergia sylvatica var. sylvatica (Torr.) Torr. ex A. Gray -- not accepted -- muhlenbergie des bois variété des bois, woodland muhly
  Muhlenbergia tricholepis (Torr.) Columbus -- accepted
  Muhlenbergia tricholepis (Torr.) P.M. Peterson -- not accepted
  Muhlenbergia utilis (Torr.) Hitchc. -- accepted -- aparejo muhly, aparejograss
  Muilla maritima (Torr.) S. Watson -- accepted -- sea muilla
  Mulgedium spicatum var. integrifolium (Torr. & A. Gray) Small -- not accepted
  Munroa Torr. -- accepted
  Munroa squarrosa (Nutt.) Torr. -- accepted
  Munroa squarrosa var. squarrosa (Nutt.) Torr. -- not accepted
  Musineon divaricatum var. hookeri (Torr. & A. Gray) Mathias -- accepted -- Hooker's wildparsley, leafy wild parsley
  Musineon hookeri (Torr. & A. Gray) Nutt. -- not accepted
  Musineon tenuifolium (Nutt. ex Torr. & A. Gray) J.M. Coult. & Rose -- accepted -- slender wildparsley
  Musineum divaricatum (Pursh) Nutt. ex Torr. & A. Gray -- not accepted
  Musineum divaricatum var. hookeri Torr. & A. Gray -- not accepted
  Musineum tenuifolium Nutt. ex Torr. & A. Gray -- not accepted
  Myriophyllum hippuroides Nutt. ex Torr. & A. Gray -- accepted -- western watermilfoil
  Nabalus asperus (Michx.) Torr. & A. Gray -- not accepted
  Nama hispidum var. spathulatum (Torr.) C.L. Hitchc. -- not accepted
  Nama parvifolia (Torr.) Greenm. -- accepted
  Nama parvifolium (Torr.) Greenm. -- not accepted -- smallleaf fiddleleaf
  Nassella arcaensis (Speg.) Torres -- accepted
  Nassella arcuata (R.E. Fr.) Torres -- accepted
  Nassella burkartii (Torres) Barkworth & Torres -- accepted
  Nassella cabrerae Torres -- accepted
  Nassella carettei (Hauman) Torres -- accepted
  Nassella catamarcensis Torres -- accepted
  Nassella dasycarpa (Hitchc.) Torres -- accepted
  Nassella depauperata var. glabrata (Pilg.) Torres -- accepted
  Nassella elata (Speg.) Torres -- accepted
  Nassella fabrisii Torres -- accepted
  Nassella famatinensis Torres -- accepted
  Nassella glabripoda Torres -- accepted
  Nassella glabripoda var. glabripoda Torres -- accepted
  Nassella glabripoda var. planifolia Torres -- accepted
  Nassella leptothera (Speg.) Torres -- accepted
  Nassella ligularis (Griseb.) Barkworth & Torres -- accepted
  Nassella meyeri Torres -- accepted
  Nassella novari Torres -- accepted
  Nassella nubicola (Speg.) Torres -- accepted
  Nassella paramillonesis (Speg.) Torres -- accepted
  Nassella parva Torres -- accepted
  Nassella pubiflora var. humilior (Hack.) Torres -- accepted
  Nassella pubiflora var. levipoda Torres -- accepted
  Nassella punensis Torres -- accepted
  Nassella quinqueciliata (Roseng. & Izag.) Barkworth & Torres -- accepted
  Nassella ragonesei Torres -- accepted
  Nassella rupestris (Phil.) Torres -- accepted
  Nassella tucumana (Parodi) Torres -- accepted
  Nassella uspallatensis (Speg.) Torres -- accepted
  Nassella ventanicola (Cabrera & Torres) Barkworth -- accepted
  Nassella yaviensis Torres -- accepted
  Nasturtium curvisiliqua (Hook.) Nutt. ex Torr. & A. Gray -- not accepted
  Navarretia divaricata (Torr. ex A. Gray) Greene -- accepted -- divaricate navarretia, mountain navarretia
  Navarretia divaricata ssp. divaricata (Torr. ex A. Gray) Greene -- accepted -- divaricate navarretia
  Navarretia filicaulis (Torr. ex A. Gray) Greene -- accepted -- threadstem pincushionplant
  Navarretia schottii Torr. -- not accepted
  Negundo californica Torr. & A. Gray -- not accepted
  Negundo californicum Torr. & A. Gray -- not accepted
  Newberrya congesta Torr. ex A. Gray -- not accepted
  Nicoraella Torres -- not accepted
  Nicoraella bomanii (Hauman) Torres -- not accepted
  Nicoraella brevis Torres -- not accepted
  Nicoraella henrardiana (Parodi) Torres -- not accepted
  Nicoraella mucronata (Griseb.) Torres -- not accepted
  Nicoraella obtusa (Nees & Meyen) Torres -- not accepted
  Nicoraella rigidiseta (Pilg.) Torres -- not accepted
  Nicoraella venusta (Phil.) Torres -- not accepted
  Nicotiana attenuata Torr. ex S. Watson -- accepted -- coyote tabacco, coyote tobacco
  Nicotiana bigelovii (Torr.) S. Watson -- not accepted
  Nicotiana quadrivalvis var. bigelovii (Torr.) DeWolf -- accepted -- Bigelow's tobacco
  Nierembergia viscosa Torr. -- not accepted
  Nissolia schottii (Torr.) A. Gray -- accepted -- Schott yellowhood, Schott's yellowhood
  Nolina bigelovii (Torr.) S. Watson -- accepted -- Bigelow nolina, Bigelow's nolina, Palmilla de culebra
  Nolina bigelovii var. bigelovii (Torr.) S. Watson -- not accepted -- Bigelow's nolina
  Nolina erumpens (Torr.) S. Watson -- accepted -- beargrass, foothill beargrass, Palmilla de Chihuahua
  Nuphar advena var. tomentosa Torr. & A. Gray -- not accepted
  Nuttallia cerasiformis Torr. & A. Gray ex Hook. & Arn. -- not accepted
  Obione acanthocarpa Torr. -- not accepted
  Odontostomum Torr. -- accepted -- Hartweg's doll's-lily
  Odontostomum hartwegii Torr. -- accepted -- Hartweg's doll's-lily
  Odostemon fremontii (Torr.) Rydb. -- not accepted
  Oemleria cerasiformis (Torr. & A. Gray ex Hook. & Arn.) J.W. Landon -- accepted -- Indian plum
  Oenothera biennis var. canescens Torr. & A. Gray -- not accepted
  Oenothera biennis var. hookeri (Torr. & A. Gray) B. Boivin -- not accepted
  Oenothera bistorta Nutt. ex Torr. & A. Gray -- not accepted
  Oenothera boothii var. pygmaea (Douglas ex Lehm.) Torr. & A. Gray -- not accepted
  Oenothera breviflora Torr. & A. Gray -- not accepted
  Oenothera californica (Nutt. ex Torr. & A. Gray) Greene -- not accepted -- California eveningprimrose
  Oenothera canescens Torr. & Frém. -- accepted -- beakpod evening primrose, beakpod eveningprimrose, spotted evening primrose, spotted evening-primrose, spotted eveningprimrose
  Oenothera cardiophylla Torr. -- not accepted
  Oenothera claviformis Torr. & Frém. -- not accepted
  Oenothera coronopifolia Torr. & A. Gray -- accepted -- crownleaf evening primrose, crownleaf evening-primrose, crownleaf eveningprimrose
  Oenothera deltoides Torr. & Frém. -- accepted -- birdcage evening primrose, birdcage evening-primrose, birdcage eveningprimrose, dune primrose
  Oenothera deltoides ssp. deltoides Torr. & Frém. -- accepted -- birdcage evening primrose, birdcage evening-primrose, birdcage primrose, triangle eveningprimrose
  Oenothera elata ssp. hookeri (Torr. & A. Gray) W. Dietr. & W.L. Wagner -- accepted -- Hooker's evening primrose, Hooker's evening-primrose
  Oenothera heterophylla var. rhombipetala (Nutt. ex Torr. & A. Gray) Fosberg -- not accepted
  Oenothera hookeri Torr. & A. Gray -- not accepted
  Oenothera jamesii Torr. & A. Gray -- accepted -- James' eveningprimrose, trumpet evening primrose, trumpet evening-primrose
  Oenothera lavandulifolia Torr. & A. Gray -- accepted -- lavenderleaf sundrops
  Oenothera ovata Nutt. ex Torr. & A. Gray -- not accepted
  Oenothera parvula Nutt. ex Torr. & A. Gray -- not accepted
  Oenothera rhombipetala Nutt. ex Torr. & A. Gray -- accepted -- fourpoint evening primrose, fourpoint evening-primrose, fourpoint eveningprimrose, greater four-point evening-primrose
  Oenothera rhombipetala auct. non Nutt. ex Torr. & A. Gray -- not accepted -- fourpoint eveningprimrose
  Oenothera scapoidea Torr. & A. Gray -- not accepted
  Oenothera serrulata ssp. drummondii (Torr. & A. Gray) Munz -- not accepted
  Oenothera spachiana Torr. & A. Gray -- accepted -- Spach's evening primrose, Spach's evening-primrose, Spach's eveningprimrose
  Oenothera strigulosa (Fisch. & C.A. Mey.) Torr. & A. Gray -- not accepted
  Oenothera tanacetifolia Torr. & A. Gray -- not accepted
  Oligoneuron houghtonii (Torr. & A. Gray ex A. Gray) G.L. Nesom -- not accepted -- Houghton's goldenrod
  Oligoneuron nitidum (Torr. & A. Gray) Small -- not accepted -- shiny goldenrod
  Oligosporus filifolius (Torr.) W.A. Weber -- not accepted
  Oplopanax (Torr. & A. Gray) Miq. -- accepted
  Opulaster pauciflorus (Torr. & A. Gray) A. Heller -- not accepted
  Opuntia californica (Torr. & A. Gray) Coville -- not accepted -- California pricklypear
  Opuntia californica var. californica (Torr. & A. Gray) Coville -- not accepted -- California pricklypear
  Orbexilum gracile (Torr. & A. Gray) Rydb. -- not accepted
  Orbexilum pedunculatum var. gracile (Torr. & A. Gray) J.W. Grimes -- not accepted
  Orbexilum simplex (Nutt. ex Torr. & A. Gray) Rydb. -- accepted -- simple scurfpea, singlestem leather-root
  Orbexilum stipulatum (Torr. & A. Gray) Rydb. -- accepted -- largestipule leather-root
  Oreobatus deliciosus (Torr.) Rydb. -- not accepted
  Oreocallis davisiae (Torr. ex A. Gray) Small -- not accepted
  Oreocarya suffruticosa (Torr.) Greene -- not accepted
  Oreostemma alpigenum (Torr. & A. Gray) Greene -- accepted -- alpine aster, tundra aster
  Oreostemma alpigenum var. alpigenum (Torr. & A. Gray) Greene -- accepted -- tundra aster
  Oriza oryzoides Dalla Torre & Sarnth. -- not accepted
  Orthocarpus imbricatus Torr. ex S. Watson -- accepted -- mountain owl's-clover
  Oryza oryzoides (L.) Dalla Torre & Sarnth. -- not accepted
  Oryzopsis canadensis (Poir.) Torr. -- not accepted -- Canadian ricegrass
  Oryzopsis pungens (Torr.) Hitchc. -- not accepted -- mountain ricegrass
  Osmaronia cerasiformis (Torr. & A. Gray ex Hook. & Arn.) Greene -- not accepted
  Osmorhiza aristata var. longistylis (Torr.) B. Boivin -- not accepted
  Osmorhiza brachypoda Torr. -- accepted -- California sweet-cicely, California sweetcicely
  Osmorhiza longistylis (Torr.) DC. -- accepted -- aniseroot, longstyle sweetroot
  Osmorhiza nuda Torr. -- not accepted
  Osmorhiza occidentalis (Nutt. ex Torr. & A. Gray) Torr. -- accepted -- sweetanise, western sweetroot
  Othake sphacelata (Nutt. ex Torr.) Rydb. -- not accepted
  Oxalis berlandieri Torr. -- not accepted
  Oxybaphus coccineus Torr. -- not accepted
  Oxystylis Torr. & Frém. -- accepted
  Oxystylis lutea Torr. & Frém. -- accepted -- spiny caper
  Oxytheca perfoliata Torr. & A. Gray -- accepted -- perfoliate oxytheca, round-leaf puncturebract, roundleaf oxytheca
  Oxytheca watsonii Torr. & A. Gray -- accepted -- Watson's oxytheca
  Oxytropis deflexa ssp. sericea (Torr. & A. Gray) Cody -- not accepted
  Oxytropis deflexa var. sericea Torr. & A. Gray -- accepted -- blue nodding locoweed, longstem hangpod crazyweed, pendant-pod locoweed
  Oxytropis sericea var. speciosa (Torr. & A. Gray) S.L. Welsh -- accepted -- white locoweed
  Packera eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve -- accepted -- widehead groundsel
  Packera eurycephala var. eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve -- accepted -- widehead groundsel
  Packera millefolia (Torr. & A. Gray) W.A. Weber & Á. Löve -- accepted -- piedmont ragwort
  Packera multilobata (Torr. & A. Gray ex A. Gray) W.A. Weber & Á. Löve -- accepted -- lobeleaf groundsel
  Palafoxia callosa (Nutt.) Torr. & A. Gray -- accepted -- small palafox, small palafoxia
  Palafoxia hookerana Torr. & A. Gray -- not accepted
  Palafoxia hookeriana Torr. & A. Gray -- accepted -- sand palafox, showy palafoxia
  Palafoxia hookeriana var. hookeriana Torr. & A. Gray -- not accepted -- sand palafox
  Palafoxia integrifolia (Nutt.) Torr. & A. Gray -- accepted -- coastal plain palafox, coastalplain palafox
  Palafoxia sphacelata (Nutt. ex Torr.) Cory -- accepted -- othake, rayed palafoxia
  Panicularia acutiflora (Torr.) Kuntze -- not accepted
  Panicularia americana (Torr.) MacMill. -- not accepted
  Panicularia pallida (Torr.) Kuntze -- not accepted
  Panicum acuminatum var. fasciculatum (Torr.) Lelong -- not accepted
  Panicum acuminatum var. fasciculatum (Torr.) Beetle -- not accepted
  Panicum angustifolium J. Le Conte ex Torr. -- not accepted
  Panicum barbatum J. Le Conte ex Torr. -- not accepted
  Panicum capillare var. sylvaticum Torr. -- not accepted
  Panicum carinatum Torr. -- not accepted
  Panicum clandestinum var. pedunculatum (Torr.) Torr. -- not accepted
  Panicum debile Torr. ex Steud. -- not accepted
  Panicum depauperatum var. involutum (Torr.) Alph. Wood -- not accepted
  Panicum dichotomum var. fasciculatum Torr. -- not accepted
  Panicum dichotomum var. ramulosum (Torr.) Lelong -- not accepted
  Panicum fasciculatum var. reticulatum (Torr.) Beal -- not accepted
  Panicum fuscum var. reticulatum (Torr.) Scribn. & Merr. -- not accepted
  Panicum glaucum var. laevigatum J. Le Conte ex Torr. -- not accepted
  Panicum huachucae var. fasciculatum (Torr.) F.T. Hubb. -- not accepted
  Panicum insulare var. lachnanthum (Torr.) Kuntze -- not accepted
  Panicum involutum Torr. -- not accepted
  Panicum lachnanthum Torr. -- not accepted
  Panicum lanuginosum subvar. pilosum (Torr.) Farw. -- not accepted
  Panicum lanuginosum var. fasciculatum (Torr.) Fernald -- not accepted
  Panicum lindheimeri subvar. pilosum (Torr.) Farw. -- not accepted
  Panicum lindheimeri var. fasciculatum (Torr.) Fernald -- not accepted
  Panicum longifolium Torr. -- not accepted
  Panicum longifolium var. longifolium Torr. -- not accepted
  Panicum longisetum Torr. -- not accepted
  Panicum macrocarpon Leconte ex Torr. -- not accepted
  Panicum macrocarpon Torr. -- not accepted
  Panicum nitidum var. barbatum Torr. -- not accepted
  Panicum nitidum var. ciliatum Torr. -- not accepted
  Panicum nitidum var. pilosum Torr. -- not accepted
  Panicum nitidum var. ramulosum Torr. -- not accepted
  Panicum pedunculatum Torr. -- not accepted
  Panicum reticulatum Torr. -- not accepted
  Panicum umbrosum J. Le Conte ex Torr. -- not accepted
  Pappostipa speciosa var. media (Torres) Romasch. -- accepted
  Parkinsonia microphylla Torr. -- accepted -- littleleaf palo verde, yellow paloverde
  Paronychia baldwinii (Torr. & A. Gray) Fenzl ex Walp. -- accepted -- Baldwin's nailwort
  Paronychia baldwinii ssp. baldwinii (Torr. & A. Gray) Fenzl ex Walp. -- not accepted -- Baldwin's nailwort
  Paronychia depressa (Torr. & A. Gray) Nutt. ex A. Nelson -- accepted -- spreading nailwort
  Paronychia depressa var. depressa (Torr. & A. Gray) Nutt. ex A. Nelson -- not accepted -- spreading nailwort
  Paronychia drummondii Torr. & A. Gray -- accepted -- Drummond's nailwort
  Paronychia drummondii var. drummondii Torr. & A. Gray -- not accepted
  Paronychia jamesii Torr. & A. Gray -- accepted -- James' nailwort, nailwort
  Paronychia setacea Torr. & A. Gray -- accepted -- bristle nailwort
  Paronychia setacea var. setacea Torr. & A. Gray -- not accepted -- bristle nailwort
  Parosela formosa (Torr.) Vail -- not accepted
  Parosela jamesii Torr. -- not accepted -- James' prairie clover
  Parosela nana (Torr. ex A. Gray) A. Heller -- not accepted
  Parryella Torr. & A. Gray ex A. Gray -- accepted
  Parryella filifolia Torr. & A. Gray ex A. Gray -- accepted -- common dunebroom, dune broom
  Parthenium alpinum (Nutt.) Torr. & A. Gray -- accepted -- alpine feverfew, Arkansas River feverfew
  Pectis angustifolia Torr. -- accepted -- lemonscent, narrowleaf pectis
  Pectis angustifolia var. angustifolia Torr. -- accepted -- lemonscent, narrowleaf pectis
  Pediomelum digitatum (Nutt. ex Torr. & A. Gray) Isely -- accepted -- palmleaf Indian breadroot
  Pediomelum linearifolium (Torr. & A. Gray) J.W. Grimes -- accepted -- narrowleaf Indian breadroot, slimleaf scurfpea
  Pediomelum rhombifolium (Torr. & A. Gray) Rydb. -- accepted -- Gulf Indian breadroot, roundleaf scurfpea
  Pediomelum subacaule (Torr. & A. Gray) Rydb. -- accepted -- whiterim scurfpea
  Pediomelum subacaulis (Torr. & A. Gray) Rydb. -- not accepted
  Peltiphyllum peltatum (Torr. ex Benth.) Engl. -- not accepted
  Penstemon alpinus Torr. -- not accepted
  Penstemon alpinus var. alpinus Torr. -- not accepted
  Penstemon ambiguus Torr. -- accepted -- bush penstemon, gilia beardtongue, gilia penstemon
  Penstemon ambiguus var. ambiguus Torr. -- accepted -- gilia beardtongue, gilia penstemon
  Penstemon deustus ssp. heterander (Torr. & A. Gray) Pennell & D.D. Keck -- not accepted
  Penstemon deustus var. heterander (Torr. & A. Gray) Cronquist -- not accepted
  Penstemon fendleri Torr. & A. Gray -- accepted -- Fendler's beardtongue, Fendler's penstemon
  Penstemon fremontii Torr. & A. Gray -- accepted -- Fremont's beardtongue, Fremont's penstemon
  Penstemon fremontii var. fremontii Torr. & A. Gray -- accepted -- Fremont's beardtongue
  Penstemon glaber var. alpinus (Torr.) A. Gray -- accepted -- alpine penstemon, alpine sawsepal penstemon
  Penstemon ternatus Torr. ex A. Gray -- not accepted
  Penstemon thurberi Torr. -- accepted -- Thurber's penstemon
  Pentodon halei (Torr. & A. Gray) A. Gray -- not accepted
  Perideridia californica (Torr.) A. Nelson & J.F. Macbr. -- accepted -- California yampah
  Peritoma platycarpa (Torr.) Iltis -- accepted -- golden spiderflower
  Perityle bisetosa (Torr. ex A. Gray) Shinners -- accepted -- twobristle rockdaisy, twospike rockdaisy
  Perityle bisetosa var. bisetosa (Torr. ex A. Gray) Shinners -- accepted -- twobristle rockdaisy, twospike rockdaisy
  Perityle dissecta (Torr.) A. Gray -- accepted -- dissected rockdaisy, slimlobe rockdaisy
  Perityle emoryi Torr. -- accepted -- Emory's rockdaisy, Emory's rocklily
  Perityle emoryi var. nuda (Torr.) A. Gray -- not accepted
  Petalostemon albidus (Torr. & A. Gray) Small -- not accepted
  Petalostemon candidus var. oligophyllus (Torr.) F.J. Herm. -- not accepted
  Petalostemon carneus var. albidus Torr. & A. Gray -- not accepted
  Petalostemon emarginatus Torr. & A. Gray -- not accepted
  Petalostemon gracilis var. oligophyllus Torr. -- not accepted
  Petalostemon griseus Torr. & A. Gray -- not accepted
  Petalostemon macrostachyus Torr. -- not accepted
  Petalostemon microphyllus (Torr. & A. Gray) A. Heller -- not accepted
  Petalostemon obovatus Torr. & A. Gray -- not accepted
  Petalostemon oligophyllus (Torr.) Torr. ex Smyth -- not accepted
  Petalostemon phleoides Torr. & A. Gray -- not accepted
  Petalostemon phleoides var. microphyllus Torr. & A. Gray -- not accepted
  Petrophytum (Nutt. ex Torr. & A. Gray) Rydb. -- accepted -- rockspirea
  Peucedanum ambiguum (Nutt.) Nutt. ex Torr. & A. Gray -- not accepted
  Peucedanum macrocarpum Nutt. ex Torr. & A. Gray -- not accepted
  Phaca neglecta Torr. & A. Gray -- not accepted
  Phacelia bicolor Torr. ex S. Watson -- accepted -- twocolor phacelia
  Phacelia bicolor var. bicolor Torr. ex S. Watson -- not accepted
  Phacelia crassifolia Torr. ex S. Watson -- not accepted
  Phacelia crenulata Torr. ex S. Watson -- accepted -- caterpillarweed, cleftleaf wildheliotrope, notch-leaf scorpion-weed
  Phacelia crenulata var. crenulata Torr. ex S. Watson -- accepted -- cleftleaf wildheliotrope
  Phacelia curvipes Torr. ex S. Watson -- accepted -- Washoe phacelia, Washoe scorpion-weed
  Phacelia douglasii (Benth.) Torr. -- accepted -- Douglas' phacelia
  Phacelia douglasii var. douglasii (Benth.) Torr. -- accepted -- Douglas' phacelia
  Phacelia fremontii Torr. -- accepted -- Fremont's phacelia, Fremont's scorpion-weed
  Phacelia glaberrima (Torr. ex S. Watson) J.T. Howell -- accepted -- Reese River phacelia, southwestern phacelia
  Phacelia gymnoclada Torr. ex S. Watson -- accepted -- nakedstem phacelia
  Phacelia hastata var. leucophylla (Torr.) Cronquist -- not accepted
  Phacelia humilis Torr. & A. Gray -- accepted -- low phacelia
  Phacelia humilis var. humilis Torr. & A. Gray -- accepted -- low phacelia
  Phacelia hydrophylloides Torr. ex A. Gray -- accepted -- waterleaf phacelia
  Phacelia infundibuliformis Torr. -- accepted -- Rio Grande phacelia, Rio Grande scorpionweed
  Phacelia integrifolia Torr. -- accepted -- gypsum phacelia, gypsum scorpion-weed, scorpion-weed
  Phacelia integrifolia var. integrifolia Torr. -- accepted -- gypsum phacelia, gypsum scorpion-weed, gypsum scorpionweed
  Phacelia intergrifolia Torr. -- not accepted
  Phacelia invesiana Torr. -- not accepted
  Phacelia ivesiana Torr. -- accepted -- Ives' phacelia, Ives' scorpion-weed
  Phacelia ivesiana var. ivesiana Torr. -- accepted -- Ives' phacelia, Ives' scorpion-weed
  Phacelia leucophylla Torr. -- not accepted
  Phacelia longipes Torr. ex A. Gray -- accepted -- longstalk phacelia
  Phacelia lutea var. glandulifera (Torr. ex S. Watson) Cronquist -- not accepted
  Phacelia neomexicana Thurb. ex Torr. -- accepted -- New Mexico phacelia, New Mexico scorpion-weed, New Mexico scorpionweed
  Phacelia palmeri Torr. ex S. Watson -- accepted -- Palmer's phacelia, Palmer's scorpion-weed, Palmer's scorpionweed
  Phacelia parryi Torr. -- accepted -- Parry's phacelia, Parry's scorpion-weed
  Phacelia popei Torr. & A. Gray -- accepted -- Pope's phacelia, Pope's scorpionweed
  Phacelia ramosissima var. latifolia (Torr.) Cronquist -- accepted -- branched scorpion-weed, branching phacelia
  Phacelia rotundifolia Torr. ex S. Watson -- accepted -- natalgrass, round-leaf scorpion-weed, roundleaf phacelia
  Phacelia viscida (Benth. ex Lindl.) Torr. -- accepted -- tacky phacelia
  Phalaris ludoviciana Torr. ex Trin. -- not accepted
  Phaseolus leiospermus Torr. & A. Gray -- not accepted
  Phaseolus polystachios var. sinuatus (Nutt. ex Torr. & A. Gray) R. Marechal, J.M. Mascherpa & F. Stainier -- accepted -- thicket bean
  Phaseolus sinuatus Nutt. ex Torr. & A. Gray -- not accepted
  Phellopterus montanus Nutt. ex Torr. & A. Gray (pro. syn.) -- not accepted
  Phemeranthus brevifolius (Torr.) Hershk. -- accepted -- pygmy fameflower
  Phemeranthus spinescens (Torr.) Hershk. -- accepted -- spiny fameflower
  Philadelphus oreganus Nutt. ex Torr. & A. Gray -- not accepted -- Oregon mock orange
  Philibertia heterophylla (Engelm. ex Torr.) Jeps. -- not accepted
  Phippsia fasciculata (Torr.) Á. Löve & D. Löve -- not accepted
  Phlox adsurgens Torr. ex A. Gray -- accepted -- northern phlox
  Phlox canescens Torr. & A. Gray -- not accepted
  Phlox hoodii ssp. canescens (Torr. & A. Gray) Wherry -- accepted -- carpet phlox
  Phlox hoodii var. canescens (Torr. & A. Gray) M. Peck -- not accepted
  Phlox longifolia var. stansburyi (Torr.) A. Gray -- not accepted
  Phlox speciosa ssp. occidentalis (Durand ex Torr.) Wherry -- accepted -- showy phlox
  Phlox speciosa ssp. woodhousei (Torr. ex A. Gray) Wherry -- accepted -- Woodhouse's phlox, woody phlox
  Phlox speciosa var. occidentalis (Durand ex Torr.) M. Peck -- not accepted
  Phlox speciosa var. woodhousei Torr. ex A. Gray -- not accepted
  Phlox stansburyi (Torr.) A. Heller -- accepted -- cold-desert phlox, Stansbury's phlox
  Phlox stansburyi ssp. stansburyi (Torr.) A. Heller -- accepted -- cold-desert phlox, Stansbury's phlox
  Phlox triovulata Thurb. ex Torr. -- accepted -- three-seed phlox, threeseed phlox
  Phlox woodhousei (Torr. ex A. Gray) E.E. Nelson -- not accepted
  Phoebanthus grandiflora (Torr. & A. Gray) S.F. Blake -- not accepted
  Phoebanthus grandiflorus (Torr. & A. Gray) S.F. Blake -- accepted -- Florida false sunflower
  Phoebanthus tenuifolia (Torr. & A. Gray) S.F. Blake -- not accepted
  Phoebanthus tenuifolius (Torr. & A. Gray) S.F. Blake -- accepted -- pineland false sunflower
  Pholisma sonorae (Torr. ex A. Gray) Yatsk. -- accepted -- sandfood
  Phoradendron bolleanum ssp. densum (Torr. ex Trel.) Wiens -- not accepted
  Phoradendron bolleanum ssp. pauciflorum (Torr.) Wiens -- not accepted
  Phoradendron bolleanum var. capitellatum (Torr. ex Trel.) Kearney & Peebles -- not accepted
  Phoradendron bolleanum var. densum (Torr. ex Trel.) Fosberg -- not accepted
  Phoradendron bolleanum var. pauciflorum (Torr.) Fosberg -- not accepted
  Phoradendron capitellatum Torr. ex Trel. -- accepted -- downy mistletoe, woolly mistletoe
  Phoradendron densum Torr. ex Trel. -- not accepted -- dense mistletoe
  Phoradendron pauciflorum Torr. -- not accepted -- fir mistletoe
  Phyla cuneifolia (Torr.) Greene -- accepted -- fogfruit, wedgeleaf, wedgeleaf fogfruit
  Phyllanthus ericoides Torr. -- accepted -- heather leaf-flower, heather leafflower
  Phyodina micrantha (Torr.) D.R. Hunt -- not accepted
  Physalis cinerascens var. spathulifolia (Torr.) J.R. Sullivan -- accepted -- smallflower groundcherry
  Physalis crassifolia var. cardiophylla (Torr.) A. Gray -- not accepted
  Physalis lanceolata var. spathulifolia Torr. -- not accepted
  Physalis lobata Torr. -- not accepted
  Physalis pumila var. sonorae Torr. -- not accepted
  Physalis virginiana var. sonorae (Torr.) Waterf. -- not accepted -- groundcherry, smooth groundcherry, Sonora groundcherry
  Physalis viscosa var. spathulifolia (Torr.) A. Gray -- not accepted
  Physaria (Nutt. ex Torr. & A. Gray) A. Gray -- accepted -- twinpod
  Physaria angustifolia (Nutt. ex Torr. & A. Gray) O'Kane & Al-Shehbaz -- accepted -- threadleaf bladderpod
  Physaria gracilis ssp. nuttallii (Torr. & A. Gray) O'Kane & Al-Shehbaz -- accepted -- Nuttall's bladderpod
  Physaria pallida (Torr. & A. Gray) O'Kane & Al-Shehbaz -- accepted -- white bladderpod
  Physocarpus monogynus (Torr.) J.M. Coult. -- accepted -- mountain ninebark
  Physocarpus pauciflorus (Torr. & A. Gray) Piper -- not accepted
  Pinus cembroides var. monophylla (Torr. & Frém.) Voss -- not accepted
  Pinus monophylla Torr. & Frém. -- accepted -- nut pine, one-leaf pine, pińón simple, singleleaf pinyon
  Pinus monophylla var. monophylla Torr. & Frém. -- accepted -- singleleaf pinyon
  Piptatherum nigrum Torr. -- not accepted
  Piptatherum pungens (Torr.) Dorn -- accepted -- mountain ricegrass
  Piptochaetium medium (Speg.) Torres -- accepted
  Piriqueta caroliniana var. viridis (Small) G.S. Torr. -- not accepted
  Pityopsis graminifolia var. tenuifolia (Torr.) Semple & F.D. Bowers -- accepted -- grassleaf goldaster, narrowleaf silkgrass
  Pityopsis oligantha (Chapm. ex Torr. & A. Gray) Small -- accepted -- grassleaf goldaster
  Plagiochila porelloides (Torrey Ex Nees) Lindenb. -- accepted
  Plagiopus oederi var. alpina (Schwaegr.) Torre & Sarnth. -- not accepted
  Plantago eriopoda Torr. -- accepted -- alkali plantain, red-woolly plantain, redwood plantain, redwool plantain, saline plantain
  Platanthera hookeri (Torr. ex A. Gray) Lindl. -- accepted -- Hooker's orchid
  Plectritis macrocera Torr. & A. Gray -- accepted -- longhorn plectritis, white cornsalad
  Plectritis macrocera ssp. macrocera Torr. & A. Gray -- accepted -- longhorn plectritis
  Pleuraphis Torr. -- not accepted -- galleta grass, Pleuraphis
  Pleuraphis jamesii Torr. -- not accepted -- galleta, James' galleta
  Poa aquatica var. americana Torr. -- not accepted
  Poa arachnifera Torr. -- accepted -- Texas bluegrass
  Poa canadensis (Michx.) Torr. -- not accepted
  Poa compressa var. sylvestris Torr. -- not accepted
  Poa debilis Torr. -- not accepted
  Poa dentata Torr. -- not accepted
  Poa elongata Torr. ex Spreng. -- not accepted
  Poa elongata Torr. -- not accepted
  Poa fasciculata Torr. -- not accepted
  Poa festucoides J. Le Conte ex Torr. -- not accepted
  Poa hirsuta var. spectabilis (Pursh) Torr. -- not accepted
  Poa oxylepis Torr. -- not accepted
  Podosemum gracillimum (Torr.) Bush -- not accepted
  Pogogyne serpylloides (Torr.) A. Gray -- accepted -- thymeleaf mesamint
  Polanisia dodecandra ssp. trachysperma (Torr. & A. Gray) Iltis -- accepted -- clammyweed, red-whisker clammyweed, sandyseed clammyweed, western clammyweed
  Polanisia dodecandra var. trachysperma (Torr. & A. Gray) Iltis -- not accepted
  Polanisia jamesii (Torr. & A. Gray) Iltis -- accepted -- James' clammyweed
  Polanisia tenuifolia Torr. & A. Gray -- accepted -- slenderleaf clammyweed
  Polanisia trachysperma Torr. & A. Gray -- not accepted
  Poliomintha incana (Torr.) A. Gray -- accepted -- frosted mint, hoary rosemarymint, rosemary mint
  Poliomintha mollis (Torr.) A. Gray -- not accepted
  Polionintha incana (Torr.) A. Gray -- not accepted
  Polygala balduinii var. chlorgena Torr. & A. Gray -- not accepted
  Polygala chapmanii Torr. & A. Gray -- accepted -- Chapman's milkwort
  Polygala grandiflora var. angustifolia Torr. & A. Gray -- not accepted -- showy milkwort
  Polygala hookeri Torr. & A. Gray -- accepted -- Hooker's milkwort
  Polygala leptocaulis Torr. & A. Gray -- accepted -- swamp milkwort
  Polygala nuttallii Torr. & A. Gray -- accepted -- Nuttall's milkwort
  Polygala senega var. latifolia Torr. & A. Gray -- not accepted -- Seneca snakeroot
  Polypogon monspeliensis var. monolepis Torr. -- not accepted
  Polypteris hookeriana (Torr. & A. Gray) A. Gray -- not accepted
  Polypteris sphacelata (Nutt. ex Torr.) Trel. -- not accepted
  Pomaria jamesii (Torr. & A. Gray) Walp. -- accepted -- James' holdback
  Pontederia cordata var. angustifolia (Pursh) Torr. -- not accepted
  Pontederia cordata var. lancifolia (Muhl. ex Elliott) Torr. -- not accepted
  Populus balsamifera ssp. trichocarpa (Torr. & A. Gray) Brayshaw -- not accepted -- balsam poplar, black cottonwood
  Populus trichocarpa Torr. & A. Gray ex Hook. -- accepted -- black cottonwood
  Porterella Torr. -- accepted
  Porterella carnosula (Hook. & Arn.) Torr. -- accepted -- fleshy porterella, porterplant
  Potentilla anserina var. grandis Torr. & A. Gray -- not accepted
  Potentilla canadensis var. pumila (Poir.) Torr. & A. Gray -- not accepted
  Potentilla canadensis var. simplex (Michx.) Torr. & A. Gray -- not accepted
  Potentilla effusa var. gossypina Nutt. ex Torr. & A. Gray -- not accepted
  Potentilla egedii ssp. grandis (Torr. & A. Gray) Hultén -- not accepted
  Potentilla egedii var. grandis (Torr. & A. Gray) J.T. Howell -- not accepted
  Potentilla flabellifolia Hook. ex Torr. & A. Gray -- accepted -- high mountain cinquefoil, Mount Rainier cinquefoil
  Potentilla gracilis var. flabelliformis (Lehm.) Nutt. ex Torr. & A. Gray -- accepted -- fanleaf cinquefoil, slender cinquefoil
  Potentilla leneophylla Torr. & James ex Eaton -- not accepted
  Potentilla leucophylla Torr. -- not accepted
  Potentilla multifoliata (Torr.) Kearney & Peebles -- not accepted
  Potentilla multifoliolata (Torr.) Kearney & Peebles -- not accepted
  Potentilla pensylvanica var. bipinnatifida (Douglas ex Hook.) Torr. & A. Gray -- not accepted
  Potentilla pentandra Engelm. ex Torr. & A. Gray -- not accepted
  Potentilla pickeringii (Torr. ex A. Gray) Greene -- not accepted
  Potentilla rivalis var. pentandra (Engelm. ex Torr. & A. Gray) S. Watson -- not accepted -- brook cinquefoil, cinquefoil
  Prenanthes barbata (Torr. & A. Gray) Milstead -- accepted -- barbed rattlesnakeroot
  Prenanthes nana (Bigelow) Torr. -- not accepted -- dwarf rattlesnakeroot
  Prenanthes serpentaria var. barbata Torr. & A. Gray -- not accepted
  Primula angustifolia Torr. -- accepted -- alpine primrose
  Prosartes hookeri Torr. -- accepted -- drops-of-gold
  Prosartes hookeri var. hookeri Torr. -- not accepted -- drops-of-gold
  Prosartes hookeri var. trachyandra (Torr.) Kartesz -- not accepted -- drops of gold
  Prosartes trachyandra Torr. -- not accepted
  Prosopis chilensis var. glandulosa (Torr.) Standl. -- not accepted
  Prosopis glandulosa Torr. -- accepted -- honey mesquite
  Prosopis glandulosa var. glandulosa Torr. -- accepted -- honey mesquite
  Prosopis juliflora var. glandulosa (Torr.) Cockerell -- not accepted
  Prosopis odorata Torr. & Frém. -- not accepted
  Prunus americana var. mollis (Torr.) Torr. & A. Gray -- not accepted
  Prunus fasciculata (Torr.) A. Gray -- accepted -- desert almond, desert peach
  Prunus fasciculata var. fasciculata (Torr.) A. Gray -- accepted -- desert almond
  Prunus glandulosa (Hook.) Torr. & A. Gray -- not accepted
  Prunus mollis Torr. -- not accepted
  Prunus virginiana var. demissa (Nutt.) Torr. -- accepted -- western chokecherry
  Psathyrotes ramosissima (Torr.) A. Gray -- accepted -- turtleback, velvet turtleback
  Pseudostellaria jamesiana (Torr.) W.A. Weber & R.L. Hartm. -- accepted -- sticky starwort, sticky-starwort, tuber starwort
  Psilocarya Torr. -- not accepted
  Psilocarya scirpoides Torr. -- not accepted
  Psoralea digitata Nutt. ex Torr. & A. Gray -- not accepted
  Psoralea floribunda Nutt. ex Torr. & A. Gray -- not accepted
  Psoralea linearifolia Torr. & A. Gray -- not accepted
  Psoralea macrostachya var. rhombifolia Torr. -- not accepted
  Psoralea obtusifolia Torr. & A. Gray -- not accepted
  Psoralea psoralioides var. gracilis (Torr. & A. Gray) F.L. Freeman -- not accepted
  Psoralea rhombifolia Torr. & A. Gray -- not accepted
  Psoralea simplex Nutt. ex Torr. & A. Gray -- not accepted
  Psoralea stipulata Torr. & A. Gray -- not accepted
  Psoralea subacaulis Torr. & A. Gray -- not accepted
  Psoralea tenuiflora var. floribunda (Nutt. ex Torr. & A. Gray) Rydb. -- not accepted
  Psoralidium digitatum (Nutt. ex Torr. & A. Gray) Rydb. -- not accepted
  Psoralidium linearifolium (Torr. & A. Gray) Rydb. -- not accepted
  Psorothamnus arborescens (Torr. ex A. Gray) Barneby -- accepted -- Mojave dalea, Mojave indigobush, Mojave smokebush
  Psorothamnus arborescens var. arborescens (Torr. ex A. Gray) Barneby -- accepted -- Mojave indigobush
  Psorothamnus fremontii (Torr. ex A. Gray) Barneby -- accepted -- Fremont dalea, Fremont's dalea
  Psorothamnus fremontii var. fremontii (Torr. ex A. Gray) Barneby -- accepted -- Fremont false dalea, Fremont's dalea
  Psorothamnus polydenius (Torr. ex S. Watson) Rydb. -- accepted -- Nevada dalea
  Psorothamnus polydenius var. polydenius (Torr. ex S. Watson) Rydb. -- accepted -- Nevada dalea, Nevada smokebush
  Psorothamnus schottii (Torr.) Barneby -- accepted -- indigobush, Schott false dalea, Schott's dalea
  Ptelea baldwinii Torr. & A. Gray -- not accepted
  Ptelea trifoliata ssp. trifoliata var. mollis Torr. & Gray -- not accepted -- common hoptree
  Ptelea trifoliata var. mollis Torr. & A. Gray -- accepted -- common hoptree
  Pterogonum alatum (Torr.) H. Gross -- not accepted
  Pteryxia (Nutt. ex Torr. & A. Gray) Nutt. ex J.M. Coult. & Rose -- accepted -- springparsley, wavewing
  Pteryxia terebinthina var. albiflora (Torr. & A. Gray) Mathias -- not accepted -- smoothshore springparsley, turpentine wavewing
  Pteryxia terebinthina var. foeniculacea (Torr. & A. Gray) Mathias -- accepted -- turpentine wavewing
  Ptilocalyx greggii Torr. & A. Gray -- not accepted
  Ptiloria pauciflora (Torr.) Raf. -- not accepted
  Puccinellia fasciculata (Torr.) E.P. Bicknell -- accepted -- saltmarsh alkaligrass, Torrey alkaligrass
  Puccinellia fasciculata var. fasciculata (Torr.) E.P. Bicknell -- not accepted
  Puccinellia pallida (Torr.) R.T. Clausen -- not accepted
  Puccinellia pallida (Torr.) T. Koyama -- not accepted
  Puccinellia pallida ssp. pallida (Torr.) R.T. Clausen -- not accepted
  Pulmonaria ciliata James ex Torr. -- not accepted
  Purshia ericifolia (Torr. ex A. Gray) Henrickson -- accepted -- heath cliffrose
  Purshia mexicana var. stansburiana (Torr.) S.L. Welsh -- not accepted
  Purshia mexicana var. stansburyana (Torr.) S.L. Welsh -- accepted
  Purshia stansburiana (Torr.) Henrickson -- not accepted -- Stansbury's cliffrose
  Purshia stansburyana (Torr.) Henrickson -- not accepted -- Stansbury's cliffrose
  Pycnanthemum albescens Torr. & A. Gray -- accepted -- whiteleaf mountainmint
  Pycnanthemum californicum Torr. ex T. Durand -- accepted -- Sierra mint
  Pycnanthemum clinopodioides Torr. & A. Gray -- accepted -- basil mountainmint
  Pycnanthemum clinopodopodes Torr. & A. Gray -- not accepted
  Pyrola uliginosa Torr. & A. Gray ex Torr. -- not accepted
  Pyrrocoma racemosa (Nutt.) Torr. & A. Gray -- accepted -- clustered goldenweed
  Pyrrocoma racemosa var. racemosa (Nutt.) Torr. & A. Gray -- accepted -- clustered goldenweed
  Quamoclidion multiflorum (Torr.) Torr. ex A. Gray -- not accepted
  Quercus agrifolia var. oxyadenia (Torr.) J.T. Howell -- not accepted -- coastal live oak
  Quercus breviloba (Torr.) Sarg. -- not accepted
  Quercus californica (Torr.) Cooper -- not accepted
  Quercus durandii var. breviloba (Torr.) E.J. Palmer -- accepted -- bastard oak
  Quercus emoryi Torr. -- accepted -- Emory's oak
  Quercus gunnisonii (Torr. & A. Gray) Rydb. -- not accepted
  Quercus oblongifolia Torr. -- accepted -- Mexican blue oak
  Quercus shumardii var. microcarpa (Torr.) Shinners -- not accepted
  Quercus sinuata var. breviloba (Torr.) C.H. Mull. -- not accepted -- bastard oak, white shin oak
  Quercus undulata Torr. -- not accepted
  Quercus X acutidens Torr. -- accepted
  Quercus X undulata Torr. -- accepted
  Quincula lobata (Torr.) Raf. -- accepted -- Chinese lantern, Chinese-lantern, purple groundcherry, purpleflower groundcherry
  Raimannia rhombipetala (Nutt. ex Torr. & A. Gray) Rose -- not accepted
  Ranunculus delphiniifolius Torr. ex Eaton -- not accepted
  Ranunculus flammula var. laxicaulis Torr. & A. Gray -- not accepted
  Ranunculus laxicaulis (Torr. & A. Gray) Darby -- accepted -- Mississippi buttercup
  Ranunculus laxicaulis var. laxicaulis (Torr. & A. Gray) Darby -- not accepted -- Mississippi buttercup
  Ranunculus occidentalis var. parviflorus Torr. -- not accepted
  Ranunculus reptans var. intermedius (Hook.) Torr. & A. Gray -- not accepted
  Ranunculus reptans var. ovalis (Bigelow) Torr. & A. Gray -- not accepted
  Ranunculus uncinatus var. parviflorus (Torr.) L.D. Benson -- not accepted -- Idaho buttercup
  Ratibida peduncularis (Torr. & A. Gray) Barnhart -- accepted -- naked Mexicanhat, naked prairie coneflower
  Ratibida peduncularis var. peduncularis (Torr. & A. Gray) Barnhart -- accepted -- naked Mexicanhat
  Reboulea pallens var. major (Torr.) Farw. -- not accepted
  Reboulea pensylvanica var. major (Torr.) A. Gray -- not accepted
  Reboulea truncata Torr. ex Munro -- not accepted
  Rhododendron arborescens (Pursh) Torr. -- accepted -- smooth azalea, sweet azalea
  Rhododendron calendulaceum (Michx.) Torr. -- accepted -- flame azalea
  Rhododendron canadense (L.) Torr. -- accepted -- rhodora
  Rhododendron hispidum (Pursh) Torr. -- not accepted
  Rhododendron nitidum (Pursh) Torr. -- not accepted
  Rhododendron nudiflorum (L.) Torr. -- not accepted
  Rhododendron occidentale (Torr. & A. Gray) A. Gray -- accepted -- California azalea, Sonoma azalea, western azalea
  Rhododendron occidentale var. occidentale (Torr. & A. Gray) A. Gray -- not accepted -- western azalea
  Rhododendron viscosum (L.) Torr. -- accepted -- clammy azalea, swamp azalea, swamp honeysuckle, Texas azalea
  Rhus diversiloba Torr. & A. Gray -- not accepted
  Rhus glabra var. occidentalis Torr. -- not accepted
  Rhynchosia intermedia (Torr. & A. Gray) Small -- not accepted
  Rhynchosia latifolia Nutt. ex Torr. & A. Gray -- accepted -- broadleaf snoutbean, prairie snoutbean
  Rhynchosia senna var. texana (Torr. & A. Gray) M.C. Johnst. -- accepted -- rosary bean, Texas snoutbean
  Rhynchosia texana Torr. & A. Gray -- not accepted
  Rhynchosia tomentosa var. erecta (Walter) Torr. & A. Gray -- not accepted
  Rhynchosia tomentosa var. mollissima (Elliott) Torr. & A. Gray -- accepted -- twining snoutbean
  Rhynchosia tomentosa var. monophylla (Michx.) Torr. & A. Gray -- not accepted
  Rhynchosia tomentosa var. volubilis (Michx.) Torr. & A. Gray -- not accepted
  Rhynchospora capillacea Torr. -- accepted -- horned beakrush, needle beaksedge
  Rhynchospora macrostachya Torr. ex A. Gray -- accepted -- tall horned beaksedge
  Rhynchospora macrostachya var. macrostachya Torr. ex A. Gray -- not accepted -- tall horned beaksedge
  Rhynchospora scirpoides (Torr.) A. Gray -- accepted -- longbeak beaksedge
  Richardia tricocca (Torr. & A. Gray) Standl. -- accepted -- prairie Mexican clover
  Richardia tricocco (Torr. & A. Gray) Standl. -- not accepted
  Rosa foliolosa Nutt. ex Torr. & A. Gray -- accepted -- white prairie rose
  Rosa setigera var. glabra Torr. & A. Gray -- not accepted
  Rosa setigera var. tomentosa Torr. & A. Gray -- not accepted -- climbing rose
  Rottboellia cylindrica (Michx.) Torr. -- not accepted
  Rubus deliciosus Torr. -- accepted -- delicious raspberry
  Rubus flagellaris var. humifusus (Torr. & A. Gray) B. Boivin -- not accepted
  Rubus idaeus var. americanus Torr. -- not accepted
  Rubus leucodermis Douglas ex Torr. & A. Gray -- accepted -- western raspberry, whitebark raspberry
  Rubus leucodermis var. leucodermis Douglas ex Torr. & A. Gray -- not accepted -- whitebark raspberry
  Rubus occidentalis var. leucodermis (Douglas ex Torr. & A. Gray) Focke -- not accepted
  Rudbeckia alismifolia Torr. & A. Gray -- not accepted
  Rudbeckia graminifolia (Torr. & A. Gray) C.L. Boynt. & Beadle -- accepted -- grassleaf coneflower
  Rudbeckia grandiflora var. alismifolia (Torr. & A. Gray) Cronquist -- accepted -- rough coneflower
  Rudbeckia heliopsidis Torr. & A. Gray -- accepted -- sunfacing coneflower
  Rudbeckia heterophylla Torr. & A. Gray -- not accepted
  Rudbeckia laciniata var. heterophylla (Torr. & A. Gray) Fernald & B.G. Schub. -- accepted
  Rudbeckia pinnatiloba (Torr. & A. Gray) Beadle -- not accepted
  Rudbeckia triloba var. pinnatiloba Torr. & A. Gray -- accepted -- browneyed Susan
  Ruellia pedunculata Torr. ex A. Gray -- accepted -- stalked wild petunia
  Ruellia pedunculata ssp. pedunculata Torr. ex A. Gray -- accepted -- stalked wild petunia
  Rumex hymenosepalus Torr. -- accepted -- canaigre, canaigre dock
  Rumex salicifolius var. denticulatus Torr. -- not accepted -- California dock, toothed willow dock
  Rydbergia grandiflora (Torr. & A. Gray ex A. Gray) Greene -- not accepted
  Sabatia campanulata (L.) Torr. -- accepted -- slender rose gentian, slender rosegentian
  Sabatia lanceolata (Walter) Torr. & A. Gray -- not accepted
  Sabina osteosperma (Torr.) Antoine -- not accepted
  Sabulina brevifolia (Nutt. ex Torr. & A. Gray) Small -- not accepted
  Sagina decumbens (Elliott) Torr. & A. Gray -- accepted -- beach pearlwort, trailing pearlwort
  Sagina decumbens ssp. decumbens (Elliott) Torr. & A. Gray -- accepted -- trailing pearlwort
  Salazaria Torr. -- accepted -- bladdersage
  Salazaria mexicana Torr. -- accepted -- bladdersage, Mexican bladdersage
  Salicornia bigelovii Torr. -- accepted -- dwarf saltwort
  Salix bigelovii Torr. -- not accepted
  Salix lasiolepis var. bigelovii (Torr.) Bebb -- not accepted -- Bigelow's willow
  Salix nigra var. falcata (Pursh) Torr. -- not accepted
  Salix petiolaris var. grisea (Willd.) Torr. -- not accepted
  Salvia azurea ssp. pitcheri (Torr. ex Benth.) Epling -- not accepted
  Salvia pitcheri Torr. ex Benth. -- not accepted
  Salvia texana (Scheele) Torr. -- accepted -- Texas sage
  Sambucus pubens var. arborescens Torr. & A. Gray -- not accepted
  Sambucus racemosa ssp. pubens var. arborescens (Torr. & A. Gray) A. Gray -- not accepted
  Sambucus racemosa ssp. pubens var. leucocarpa (Torr. & A. Gray) Cronquist -- not accepted
  Sambucus racemosa var. arborescens (Torr. & A. Gray) A. Gray -- accepted -- Pacific red elder
  Sambucus racemosa var. leucocarpa (Torr. & A. Gray) Cronquist -- accepted -- European red elderberry
  Sanicula tuberosa Torr. -- accepted -- turkey pea
  Sarcobatus vermiculatus (Hook.) Torr. -- accepted -- black greasewood, greasewood
  Sarcobatus vermiculatus var. vermiculatus (Hook.) Torr. -- not accepted -- greasewood
  Sarcodes Torr. -- accepted -- snow plant, snowplant
  Sarcodes sanguinea Torr. -- accepted -- snowplant
  Sarracenia purpurea ssp. heterophylla (Eaton) Torr. -- not accepted
  Sarracenia purpurea var. heterophylla (Eaton) Torr. -- not accepted
  Satureja glabella var. angustifolia (Torr.) Svenson -- not accepted
  Saxifraga jamesii Torr. -- not accepted
  Saxifraga peltata Torr. ex Benth. -- not accepted
  Saxifraga sullivantii Torr. & A. Gray -- not accepted
  Saxifraga tolmiei Torr. & A. Gray -- not accepted -- alpine saxifrage, Tolmie's saxifrage
  Schaueria linearifolia Torr. -- not accepted
  Schaueria parvifolia Torr. -- not accepted
  Schizachne purpurascens (Torr.) Swallen -- accepted -- false melic, false melic grass
  Schizachne purpurascens f. purpurascens (Torr.) Swallen -- not accepted
  Schizachne purpurascens ssp. purpurascens (Torr.) Swallen -- accepted
  Schizachne purpurascens var. purpurascens (Torr.) Swallen -- not accepted
  Schoenolirion Torr. ex Durand -- accepted -- sunnybell
  Schoenoplectus fluviatilis (Torr.) M.T. Strong -- not accepted -- river bulrush
  Schoenoplectus subterminalis (Torr.) Soják -- accepted -- swaying bulrush
  Schrankia angustata Torr. & A. Gray -- not accepted
  Scirpus carinatus (Hook. & Arn. ex Torr.) A. Gray, non Sm. -- not accepted
  Scirpus cernuus ssp. californicus (Torr.) Thorne -- not accepted
  Scirpus cernuus var. californicus (Torr.) Beetle -- not accepted
  Scirpus cylindricus (Torr.) Britton -- not accepted
  Scirpus fluviatilis (Torr.) A. Gray -- not accepted
  Scirpus glaucus Torr. -- not accepted
  Scirpus nanus var. anachaetus (Torr.) Britton -- not accepted
  Scirpus rostellatus Torr. -- not accepted
  Scirpus subterminalis Torr. -- not accepted
  Scirpus subterminalis var. cylindricus (Torr.) T. Koyama -- not accepted
  Sclerachne Torr. ex Trin. -- not accepted
  Sclerachne arkansana (Nutt.) Torr. ex Trin. -- not accepted
  Scleria baldwinii (Torr.) Steud. -- accepted -- Baldwin's nutrush
  Sclerochloa arenaria var. fasciculata (Torr.) A. Gray -- not accepted
  Scoliopus Torr. -- accepted -- fetid adderstongue
  Scoliopus bigelovii Torr. -- accepted -- California fetid adderstongue
  Scutellaria parvula var. missouriensis (Torr.) Goodman & C.A. Lawson -- accepted -- Leonard's skullcap
  Scutellaria resinosa Torr. -- accepted -- sticky skullcap
  Sedum lanceolatum Torr. -- accepted -- lance-leaf stonecrop, lanceleaf stonecrop, spearleaf stonecrop
  Sedum lanceolatum ssp. lanceolatum Torr. -- not accepted -- lance-leaf stonecrop, spearleaf stonecrop
  Sedum lanceolatum var. lanceolatum Torr. -- accepted -- spearleaf stonecrop
  Sedum nuttallii Torr. & E. James ex Eaton -- accepted -- yellow stonecrop
  Selenia dissecta Torr. & A. Gray -- accepted -- Texas selenia
  Selinocarpus angustifolius Torr. -- not accepted -- narrowleaf moonpod
  Selinocarpus parvifolius (Torr.) Standl. -- not accepted -- littleleaf moonpod
  Senecio aureus var. borealis Torr. & A. Gray -- not accepted
  Senecio cymbalarioides var. borealis (Torr. & A. Gray) Greenm. -- not accepted
  Senecio douglasii var. jamesii (Torr. & A. Gray) Ediger ex Correll & M.C. Johnst. -- not accepted
  Senecio eurycephalus Torr. & A. Gray -- not accepted -- widehead groundsel
  Senecio eurycephalus var. eurycephalus Torr. & A. Gray -- not accepted -- Siskiyou ragwort
  Senecio fremontii Torr. & A. Gray -- accepted -- dwarf mountain ragwort, Fremont's groundsel
  Senecio fremontii var. fremontii Torr. & A. Gray -- accepted -- dwarf mountain ragwort
  Senecio hookeri Torr. & A. Gray -- not accepted
  Senecio millefolium Torr. & A. Gray -- not accepted -- piedmont ragwort
  Senecio millefolius Torr. & A. Gray -- not accepted
  Senecio multilobatus Torr. & A. Gray ex A. Gray -- not accepted -- lobeleaf groundsel
  Senecio obovatus var. elliottii (Torr. & A. Gray) Fernald -- not accepted
  Senecio riddellii Torr. & A. Gray -- accepted -- Riddell's groundsel, Riddell's ragwort, sand groundsel
  Senecio spartioides Torr. & A. Gray -- accepted -- broom groundsel, broom-like ragwort, broomlike ragwort
  Senecio spartioides var. fremontii (Torr. & A. Gray) Greenm. -- not accepted
  Senecio spartioides var. spartioides Torr. & A. Gray -- not accepted -- broom-like ragwort
  Senecio streptanthifolius var. borealis (Torr. & A. Gray) J.F. Bain -- not accepted -- Rocky Mountain groundsel
  Serjania incisa Torr. -- accepted -- slashleaf slipplejack
  Setaria glauca var. purpurascens (Kunth) Torr. -- not accepted
  Setcreasea brevifolia (Torr.) Pilg. -- not accepted
  Setcreasea leiandra (Torr.) Pilg. -- not accepted
  Sherwoodia galacifolia (Torr. & A. Gray) House -- not accepted
  Shortia Torr. & A. Gray -- accepted
  Shortia galacifolia Torr. & A. Gray -- accepted -- Oconee bells, Oconee-bells
  Shortia galacifolia var. galacifolia Torr. & A. Gray -- accepted -- Oconee bells
  Sida elliottii Torr. & A. Gray -- accepted -- Elliott's fanpetals
  Sida elliottii var. elliottii Torr. & A. Gray -- accepted -- Elliott's fanpetals
  Sida filicaulis Torr. & A. Gray -- not accepted
  Sida hederacea (Douglas ex Hook.) Torr. ex A. Gray -- not accepted -- alkali mallow, alkali sida, dollar weed
  Sida texana (Torr. & A. Gray) Small -- not accepted
  Sidalcea diploscypha (Torr. & A. Gray) A. Gray -- accepted -- fringed checkerbloom
  Sidalcea malviflora ssp. californica (Nutt. ex Torr. & A. Gray) C.L. Hitchc. -- accepted -- California checkerbloom
  Sidalcea malviflora var. californica (Nutt. ex Torr. & A. Gray) Jeps. -- not accepted
  Sidalcea oregana (Nutt. ex Torr. & A. Gray) A. Gray -- accepted -- Oregon checkerbloom, Oregon checkermallow
  Sidalcea oregana ssp. oregana (Nutt. ex Torr. & A. Gray) A. Gray -- accepted -- Oregon checkerbloom, Oregon checkermallow
  Sidalcea oregana ssp. oregana var. oregana (Nutt. ex Torr. & A. Gray) A. Gray -- not accepted -- Oregon checkerbloom, Oregon checkermallow
  Sidalcea oregana var. oregana (Nutt. ex Torr. & A. Gray) A. Gray -- not accepted -- Oregon checkerbloom
  Sieglingia mutica (Torr.) Kuntze -- not accepted
  Silphium compositum ssp. ovatifolium (Torr. & A. Gray) Sweeny & T.R. Fisher -- not accepted
  Silphium compositum var. ovatifolium Torr. & A. Gray -- not accepted -- kidneyleaf rosinweed
  Silphium compositum var. reniforme (Raf. ex Nutt.) Torr. & A. Gray -- not accepted -- kidneyleaf rosinweed
  Silphium integrifolium var. laeve Torr. & A. Gray -- accepted -- wholeleaf rosinweed
  Silphium ovatifolium (Torr. & A. Gray) Small -- not accepted
  Siphonoglossa longiflora (Torr.) A. Gray -- not accepted -- longflower tubetongue
  Siphonoglossa pilosella (Nees) Torr. -- not accepted -- hairy tubetongue
  Siphonychia americana (Nutt.) Torr. & A. Gray -- not accepted
  Sisymbrium dentatum Torr. -- not accepted
  Sisymbrium linifolium (Nutt.) Nutt. ex Torr. & A. Gray -- accepted -- flaxleaf plainsmustard
  Solanum fendleri A. Gray ex Torr. -- not accepted -- Fendler horsenettle, Fendler's horsenettle
  Solanum fendleri var. fendleri A. Gray ex Torr. -- not accepted -- Fendler's horse-nettle, Fendler's horsenettle
  Solanum jamesii Torr. -- accepted -- wild potato
  Solanum umbelliferum var. glabrescens Torr. -- not accepted -- bluewitch
  Solanum umbelliferum var. incanum Torr. -- not accepted -- bluewitch
  Solidago amplexicaulis Torr. & A. Gray ex A. Gray non M. Martens -- not accepted
  Solidago angusta Torr. & A. Gray -- not accepted
  Solidago bicolor var. concolor Torr. & A. Gray -- not accepted
  Solidago boothii var. brachyphylla (Chapm. ex Torr. & A. Gray) A. Gray -- not accepted
  Solidago boottii var. brachyphylla (Chapm. ex Torr. & A. Gray) A. Gray -- not accepted
  Solidago brachyphylla Chapm. ex Torr. & A. Gray -- accepted -- Dixie goldenrod
  Solidago buckleyi Torr. & A. Gray -- accepted -- Buckley's goldenrod
  Solidago caesia var. curtisii (Torr. & A. Gray) Alph. Wood -- not accepted -- mountain decumbent goldenrod
  Solidago canadensis var. scabra Torr. & A. Gray -- not accepted -- Canada goldenrod, Canadian goldenrod
  Solidago curtisii Torr. & A. Gray -- accepted -- mountain decumbent goldenrod
  Solidago curtisii var. curtisii Torr. & A. Gray -- accepted
  Solidago drummondii Torr. & A. Gray -- accepted -- Drummond's goldenrod
  Solidago elliottii Torr. & A. Gray -- not accepted
  Solidago gracillima Torr. & A. Gray -- not accepted -- Virginia goldenrod
  Solidago houghtonii Torr. & A. Gray ex A. Gray -- accepted -- Houghton's goldenrod
  Solidago lancifolia Torr. & A. Gray -- accepted -- lance-leaf goldenrod
  Solidago leavenworthii Torr. & A. Gray -- accepted -- Leavenworth's goldenrod
  Solidago leptocephala Torr. & A. Gray -- not accepted
  Solidago monticola Torr. & A. Gray -- not accepted
  Solidago neglecta Torr. & A. Gray -- not accepted
  Solidago nitida Torr. & A. Gray -- accepted -- shiny goldenrod
  Solidago occidentalis (Nutt.) Torr. & A. Gray -- not accepted
  Solidago patula ssp. strictula Torr. & A. Gray -- accepted -- roundleaf goldenrod
  Solidago patula var. strictula Torr. & A. Gray -- not accepted -- roundleaf goldenrod
  Solidago petiolaris var. angusta (Torr. & A. Gray) A. Gray -- not accepted -- downy ragged goldenrod
  Solidago ptarmicoides (Torr. & A. Gray) B. Boivin -- accepted -- prairie goldenrod, upland white aster, verge-d'or faux-ptarmica, white flat-top goldenrod
  Solidago rigidiuscula (Torr. & A. Gray) Porter -- not accepted
  Solidago roanensis var. monticola (Torr. & A. Gray) Fernald -- not accepted
  Solidago scaberrima Torr. & A. Gray -- not accepted
  Solidago shortii Torr. & A. Gray -- accepted -- Short's goldenrod
  Solidago speciosa var. angustata Torr. & A. Gray -- not accepted
  Solidago speciosa var. rigidiuscula Torr. & A. Gray -- accepted -- showy goldenrod
  Solidago stricta ssp. gracillima (Torr. & A. Gray) Semple -- accepted -- Virginia goldenrod
  Solidago uliginosa var. linoides (Torr. & A. Gray) Fernald -- not accepted -- bog goldenrod
  Solidago uliginosa var. neglecta (Torr. & A. Gray) Fernald -- not accepted
  Solidago uliginosa var. terrae-novae (Torr. & A. Gray) Fernald -- not accepted -- bog goldenrod
  Solidago verna M.A. Curtis ex Torr. & A. Gray -- accepted -- springflowering goldenrod
  Sophora affinis Torr. & A. Gray -- not accepted -- Eve's necklacepod, Texas sophora
  Sophora tomentosa var. truncata Torr. & A. Gray -- accepted -- yellow necklacepod
  Sorengia longifolia (Torr.) Zuloaga & Morrone -- not accepted
  Sorengia longifolia ssp. longifolia (Torr.) Zuloaga & Morrone -- not accepted
  Sphaeralcea coccinea ssp. dissecta (Nutt. ex Torr. & A. Gray) Kearney -- not accepted
  Sphaeralcea coccinea var. dissecta (Nutt. ex Torr. & A. Gray) Garrett -- not accepted
  Sphaeralcea emoryi Torr. ex A. Gray -- accepted -- Emory's desertmallow, Emory's globemallow
  Sphaeralcea emoryi ssp. emoryi Torr. ex A. Gray -- not accepted -- Emory's globemallow
  Sphaeralcea emoryi var. emoryi Torr. ex A. Gray -- not accepted -- globemallow
  Sphaeralcea grossulariifolia ssp. pedata (Torr. ex A. Gray) Kearney -- accepted -- berryleaf globemallow, gooseberryleaf globemallow
  Sphaeralcea grossulariifolia var. pedata (Torr. ex A. Gray) Kearney -- not accepted
  Sphaeralcea incana Torr. ex A. Gray -- accepted -- gray globemallow, soft globe-mallow
  Sphaeralcea incana ssp. incana Torr. ex A. Gray -- accepted -- gray globemallow
  Sphaeralcea rivularis (Douglas ex Hook.) Torr. -- not accepted
  Sphenopholis obtusata var. major (Torr.) Erdman -- not accepted
  Sphenopholis pallens ssp. major (Torr.) Scribn. -- not accepted
  Sphenopholis pallens var. major (Torr.) Scribn. ex B.L. Rob. -- not accepted
  Spigelia loganioides (Torr. & A. Gray ex Endl. & Fenzl) A. DC. -- accepted -- Florida pinkroot
  Spigelia texana (Torr. & A. Gray) A. DC. -- accepted -- Texas pinkroot
  Spiraea californica Torr. -- not accepted
  Spiraea millefolium Torr. -- not accepted
  Spiraea monogyna Torr. -- not accepted
  Spiraea pectinata (Pursh) Torr. & A. Gray -- not accepted
  Sporobolus airoides (Torr.) Torr. -- accepted -- alkali sacaton, alkali-sacaton
  Sporobolus airoides var. airoides (Torr.) Torr. -- accepted
  Sporobolus compressus (Torr.) Kunth -- not accepted
  Sporobolus cryptandrus (Torr.) A. Gray -- accepted -- sand dropseed
  Sporobolus cryptandrus var. typicus (Torr.) E.K. Jones & Fassett -- not accepted
  Sporobolus cuspidatus (Torr. ex Hook.) Alph. Wood -- not accepted
  Sporobolus depauperatus (Torr. ex Hook.) Scribn. -- not accepted
  Sporobolus longifolius (Torr.) Alph. Wood -- not accepted
  Sporobolus tricholepis (Torr.) J.M. Coult. -- not accepted
  Sporobolus utilis (Torr.) Scribn. -- not accepted
  Sporobolus vaginiflorus (Torr. ex A. Gray) Alph. Wood -- accepted -- poverty dropseed, poverty grass
  Sporobolus vaginiflorus var. vaginiflorus (Torr. ex A. Gray) Alph. Wood -- accepted -- poverty dropseed
  Spraguea Torr. -- not accepted
  Spraguea umbellata Torr. -- not accepted
  Stellaria borealis var. crispa (Cham. & Schltdl.) Fenzl ex Torr. & A. Gray -- not accepted
  Stellaria jamesiana Torr. -- not accepted
  Stellaria littoralis Torr. -- accepted -- beach starwort
  Stellaria nuttallii Torr. & A. Gray -- not accepted
  Stenandrium barbatum Torr. & A. Gray -- accepted -- early shaggytuft
  Stenophyllus warei (Torr.) Britton -- not accepted
  Stephanomeria pauciflora (Torr.) A. Nelson -- accepted -- brownplume wirelettuce, fewflower wirelettuce, skeletonweed, wire lettuce, wire-lettuce
  Stephanomeria pauciflora var. pauciflora (Torr.) A. Nelson -- not accepted
  Stillingia salicifolia (Torr.) Raf. -- not accepted
  Stillingia spinulosa Torr. -- accepted -- annual stillingia, annual toothleaf
  Stillingia sylvatica var. linearifolia (Torr.) Müll. Arg. -- not accepted
  Stillingia sylvatica var. salicifolia Torr. -- not accepted
  Stipa burkartii Torres -- not accepted
  Stipa durifolia Parodi ex Torres -- not accepted
  Stipa occidentalis Thurb. ex Torr. -- not accepted
  Stipa scabrifolia Torres -- not accepted
  Stipa ventanicola Cabrera & Torres -- not accepted
  Streptanthus crassicaulis Torr. -- not accepted
  Strombocarpa odorata (Torr. & Frém.) A. Gray -- not accepted
  Strophostyles leiosperma (Torr. & A. Gray) Piper -- accepted -- slick-seed fuzzy-bean, slickseed fuzzybean, smoothseed wildbean
  Stylisma pickeringii (Torr. ex M.A. Curtis) A. Gray -- accepted -- Pickering's dawnflower, Pickering's morning-glory
  Stylisma pickeringii var. pickeringii (Torr. ex M.A. Curtis) A. Gray -- accepted -- Pickering's dawnflower
  Styphnolobium affine (Torr. & A. Gray) Walp. -- accepted -- Eve's necklacepod
  Styrax californicus Torr. -- not accepted
  Styrax officinalis var. californicus (Torr.) Rehder -- not accepted
  Styrax officinalis var. redivivus (Torr.) R.A. Howard -- not accepted -- drug snowbell
  Styrax platanifolius Engelm. ex Torr. -- accepted -- sycamoreleaf snowbell
  Styrax platanifolius ssp. platanifolius Engelm. ex Torr. -- accepted -- sycamoreleaf snowbell
  Styrax rediviva (Torr.) Wheeler -- not accepted -- drug snowbell
  Styrax redivivus (Torr.) L.C. Wheeler -- accepted -- California styrax, drug snowbell
  Suaeda moquinii (Torr.) Greene -- not accepted -- alkali seepweed, Mojave seablite, shrubby seepweed, Torrey's seepweed
  Suckleya suckleyana (Torr.) Rydb. -- accepted -- poison suckleya
  Suckleyi suckleyana (Torr.) Rydb. -- not accepted
  Sullivantia Torr. & A. Gray ex A. Gray -- accepted -- coolwort
  Sullivantia ohionis Torr. & A. Gray ex A. Gray -- not accepted
  Sullivantia sullivantii (Torr. & A. Gray) Britton -- accepted -- Sullivant's coolwort
  Swertia parryi (Torr.) Kuntze -- not accepted
  Symphyotrichum anomalum (Engelm. ex Torr. & A. Gray) G.L. Nesom -- accepted -- manyray aster
  Symphyotrichum boreale (Torr. & A. Gray) A. Löve & D. Löve -- accepted -- northern bog aster
  Symphyotrichum chapmanii (Torr. & A. Gray) Semple & Brouillet -- accepted -- savannah aster
  Symphyotrichum dumosum var. strictior (Torr. & A. Gray) G.L. Nesom -- accepted -- rice button aster
  Symphyotrichum dumosum var. subulifolium (Torr. & A. Gray) G.L. Nesom -- accepted -- rice button aster
  Symphyotrichum elliotii (Torr. & A. Gray) G.L. Nesom -- accepted -- Elliott's aster
  Symphyotrichum ericoides var. stricticaule (Torr. & A. Gray) G.L. Nesom -- not accepted -- white heath aster
  Symphyotrichum falcatum var. commutatum (Torr. & A. Gray) G.L. Nesom -- accepted -- white prairie aster
  Symphyotrichum novi-belgii var. elodes (Torr. & A. Gray) G.L. Nesom -- accepted -- New York aster
  Symphyotrichum spathulatum var. fremontii (Torr. & A. Gray) G.L. Nesom -- not accepted
  Taenidia (Torr. & A. Gray) Drude -- accepted
  Talinum brevifolium Torr. -- not accepted -- pygmy fameflower, pygmy talinum
  Talinum spinescens Torr. -- not accepted -- spiny fameflower
  Tanacetum capitatum (Nutt.) Torr. & A. Gray -- not accepted
  Tanacetum nuttallii Torr. & A. Gray -- not accepted
  Taraxia (Nutt. ex Torr. & A. Gray) Raim. -- accepted
  Taraxia breviflora (Torr. & A. Gray) Nutt. ex Small -- accepted -- fewflower evening primrose
  Taraxia tanacetifolia (Torr. & A. Gray) Piper -- accepted -- tansyleaf evening primrose
  Tauschia arguta (Torr. & A. Gray) J.F. Macbr. -- accepted -- southern umbrellawort
  Telesonix jamesii (Torr.) Raf. -- accepted -- James' saxifrage, James' telesonix
  Tephrosia flexuosa (Vail) Chapm. ex Torr. & A. Gray -- not accepted
  Tephrosia spicata (Walter) Torr. & A. Gray -- accepted -- spiked hoarypea
  Tephrosia virginiana var. glabra Nutt. ex Torr. & A. Gray -- not accepted
  Tephrosia virginiana var. holosericea (Nutt.) Torr. & A. Gray -- not accepted
  Tetradymia glabrata Torr. & A. Gray -- accepted -- littleleaf horsebrush
  Tetradymia nuttallii Torr. & A. Gray -- accepted -- Nuttall's horsebrush
  Tetradymia ramosissima Torr. -- not accepted
  Tetragonotheca ludoviciana (Torr. & A. Gray) A. Gray ex H.M. Hall -- accepted -- Louisiana nerveray
  Tetragonothela ludoviciana (Torr. & A. Gray) A. Gray ex H.M. Hall -- not accepted
  Tetramerium nervosum var. hispidum (Nees) Torr. -- not accepted
  Tetramerium platystegium Torr. -- not accepted
  Tetraneuris depressa (Torr. & A. Gray ex A. Gray) Greene -- not accepted -- flat four-nerve daisy
  Tetraneuris grandiflora (Torr. & A. Gray ex A. Gray) K.F. Parker -- not accepted -- graylocks four-nerve daisy
  Teucrium laciniatum Torr. -- accepted -- germander, lacy germander
  Thalictrum fendleri var. polycarpum Torr. -- not accepted -- Fendler's meadow-rue, manyfruit meadowrue
  Thalictrum occidentale var. megacarpum (Torr.) H. St. John -- not accepted
  Thalictrum polycarpum (Torr.) S. Watson -- accepted
  Thamnosma Torr. & Frém. -- accepted -- desert rue, desertrue
  Thamnosma montana Torr. & Frém. -- accepted -- Mohave desertrue, turpentine broom, turpentinebroom
  Thamnosma texana (A. Gray) Torr. -- accepted -- desert rue, Dutchman's britches, rue of the mountains
  Thelesperma gracile (Torr.) A. Gray -- not accepted
  Thelypodium brachycarpum Torr. -- accepted -- short-podded thelypody, shortpod thelypody
  Thelypodium sagittatum (Nutt. ex Torr. & A. Gray) Endl. ex Walp. -- accepted -- arrow thelypody, slender thelypody
  Thelypodium sagittatum ssp. sagittatum (Nutt. ex Torr. & A. Gray) Endl. ex Walp. -- accepted -- arrow thelypody
  Thermopsis fraxinifolia (Nutt. ex Torr. & A. Gray) M.A. Curtis -- accepted -- ashleaf goldenbanner
  Tidestromia suffruticosa (Torr.) Standl. -- accepted -- shrubby honeysweet, shrubby tidestromia
  Tidestromia suffruticosa var. suffruticosa (Torr.) Standl. -- accepted -- shrubby honeysweet
  Tillaea aquatica var. drummondii (Torr. & A. Gray) Jeps. -- not accepted
  Tillaea aquatica var. drummondii sensu (Torr. & A. Gray) Jeps. -- not accepted
  Tillaea drummondii Torr. & A. Gray -- not accepted
  Tillaeastrum drummondii sensu (Torr. & A. Gray) Britton -- not accepted
  Tillaeastrum drummondii (Torr. & A. Gray) Britton -- not accepted
  Tinantia anomala (Torr.) C.B. Clarke -- accepted -- false dayflower, widowstears
  Tiquilia brevifolia var. plicata Torr. -- not accepted
  Tiquilia greggii (Torr. & A. Gray) A.T. Richardson -- accepted -- Gregg's coldenia, plumed crinklemat
  Tiquilia hispidissima (Torr. & A. Gray) A.T. Richardson -- accepted -- hairy coldenia, hairy crinklemat
  Tiquilia plicata (Torr.) A.T. Richardson -- accepted -- fan-leaf crinklemat, fanleaf crinklemat, fanleaf tiquilia
  Tithymalopsis wrightii (Torr. & A. Gray) Small -- not accepted
  Tithymalus inundatus (Torr. ex Chapm.) Small -- not accepted
  Tolmiea Torr. & A. Gray -- accepted -- pig-a-back plant, youth on age
  Tolmiea menziesii (Pursh) Torr. & A. Gray -- accepted -- youth on age
  Tonestus pygmaeus (Torr. & A. Gray) A. Nelson -- accepted -- pygmy goldenweed
  Torreya californica Torr. -- accepted -- California nutmeg, California torreya
  Torreyochloa pallida (Torr.) G.L. Church -- accepted -- pale false mannagrass
  Torreyochloa pallida var. pallida (Torr.) G.L. Church -- accepted -- pale false mannagrass, pale manna grass
  Toxicodendron diversilobum (Torr. & A. Gray) Greene -- accepted -- Pacific poison oak
  Toxicodendron radicans ssp. diversilobum (Torr. & A. Gray) Thorne -- not accepted
  Toxicoscordion fremontii (Torr.) Rydb. -- accepted -- Fremont's deathcamas
  Tradescantia anomala Torr. -- not accepted
  Tradescantia brevifolia (Torr.) Rose -- accepted -- Trans-Pecos spiderwort, TransPecos spiderwort
  Tradescantia leiandra Torr. -- accepted -- canyon spiderwort
  Tradescantia leiandra var. brevifolia Torr. -- not accepted
  Tradescantia leiandra var. leiandra Torr. -- not accepted -- canyon spiderwort
  Tradescantia micrantha Torr. -- not accepted
  Tragia laciniata (Torr.) Müll. Arg. -- accepted -- Sonoita noseburn
  Tragia leptophylla (Torr.) I.M. Johnst. -- not accepted -- fineleaf noseburn
  Tragia nepetifolia var. leptophylla (Torr.) Shinners -- not accepted
  Tragia nepetifolia var. ramosa (Torr.) Müll. Arg. -- not accepted
  Tragia ramosa Torr. -- accepted -- branched noseburn, branched tragia, catnip noseburn, noseburn
  Tragia ramosa var. leptophylla Torr. -- not accepted
  Tricardia Torr. ex S. Watson -- accepted
  Tricardia watsonii Torr. ex S. Watson -- accepted -- threehearts
  Trichocoronis wrightii (Torr. & A. Gray) A. Gray -- accepted -- limestone bugheal, river bugheal
  Trichocoronis wrightii var. wrightii (Torr. & A. Gray) A. Gray -- not accepted
  Trichodium montanum Torr. -- not accepted
  Trichophorum palustre var. calvum (Torr.) House -- not accepted
  Tricuspis mutica Torr. -- not accepted
  Tricuspis pulchella (Kunth) Torr. -- not accepted
  Tricuspis sesleroides Torr. -- not accepted
  Tridens muticus (Torr.) Nash -- accepted -- slim tridens
  Tridens muticus f. muticus (Torr.) Nash -- accepted
  Tridens muticus var. muticus (Torr.) Nash -- accepted -- rough tridens, slim tridens
  Trientalis europaea var. latifolia (Hook.) Torr. -- not accepted
  Trifolium albopurpureum Torr. & A. Gray -- accepted -- rancheria clover
  Trifolium amphianthum Torr. & A. Gray -- not accepted
  Trifolium amplectens Torr. & A. Gray -- not accepted
  Trifolium barbigerum Torr. -- accepted -- bearded clover
  Trifolium barbigerum var. barbigerum Torr. -- accepted -- bearded clover
  Trifolium dasyphyllum Torr. & A. Gray -- accepted -- alpine clover, Uinta clover, whiproot clover
  Trifolium dasyphyllum ssp. dasyphyllum Torr. & A. Gray -- accepted -- alpine clover
  Trifolium depauperatum var. amplectens (Torr. & A. Gray) S. Watson -- accepted -- balloon sack clover
  Trifolium gracilentum Torr. & A. Gray -- accepted -- pin-point clover, pinpoint clover
  Trifolium gracilentum var. gracilentum Torr. & A. Gray -- accepted -- pinpoint clover
  Trifolium heterodon Torr. & A. Gray -- not accepted
  Trifolium involucratum var. heterodon (Torr. & A. Gray) S. Watson -- not accepted
  Trifolium macraei var. albopurpureum (Torr. & A. Gray) Greene -- not accepted
  Trifolium nanum Torr. -- accepted -- dwarf clover
  Trillium angustipetalum (Torr.) J.D. Freeman -- accepted -- narrowpetal wakerobin
  Trillium chloropetalum (Torr.) Howell -- accepted -- giant wakerobin
  Trillium chloropetalum var. angustipetalum (Torr.) Munz -- not accepted
  Trillium chloropetalum var. chloropetalum (Torr.) Howell -- accepted -- giant wakerobin
  Trillium erectum var. flavum Torr. -- not accepted
  Trillium sessile var. angustipetalum Torr. -- not accepted
  Trillium sessile var. chloropetalum Torr. -- not accepted
  Triodia mutica (Torr.) Scribn. -- not accepted
  Triodia pallida (Torr.) Spreng. -- not accepted
  Tripterocalyx (Torr.) Hook. -- accepted -- sandpuffs
  Tripterocalyx micranthus (Torr.) Hook. -- accepted -- sandpuffs, small-flower sandpuffs, smallflower sand verbena
  Trisetum kochianum Hern. Torres -- not accepted
  Trisetum palustre (Michx.) Torr. -- not accepted
  Trisetum purpurascens Torr. -- not accepted
  Troximon glaucum var. dasycephalum Torr. & A. Gray -- not accepted
  Tylosema (Schweinf.) Torre & Hillc. -- accepted
  Tylosema fassoglense (Kotschy ex Schweinf.) Torre & Hillc. -- accepted
  Uniola stricta Torr. -- not accepted
  Urachne canadensis (Poir.) Torr. -- not accepted
  Urachne canadensis Torr. & A. Gray ex Trin. & Rupr. -- not accepted
  Uralepis pallida (Torr.) Kunth -- not accepted
  Urochloa fasciculata var. reticulata (Torr.) R.D. Webster -- not accepted
  Urochloa fusca var. reticulata (Torr.) B.F. Hansen & Wunderlin -- not accepted
  Utricularia striata Leconte ex Torr. -- accepted -- striped bladderwort
  Vaccinium membranaceum Douglas ex Torr. -- accepted -- mountain bilberry, thinleaf huckleberry
  Vaccinium vacillans Kalm ex Torr. -- not accepted
  Vachellia schottii (Torr.) Seigler & Ebinger -- accepted -- Schott's wattle
  Valeriana ciliata Torr. & A. Gray -- not accepted
  Valeriana edulis Nutt. ex Torr. & A. Gray -- accepted -- edible valerian, tobacco root, tobaccoroot
  Valeriana edulis ssp. ciliata (Torr. & A. Gray) F.G. Mey. -- not accepted
  Valeriana edulis var. ciliata (Torr. & A. Gray) Cronquist -- accepted -- tobacco root
  Valeriana edulis var. edulis Nutt. ex Torr. & A. Gray -- accepted -- tobacco root
  Valeriana sitchensis ssp. uliginosa (Torr. & A. Gray) F.G. Mey. -- accepted -- marsh valerian, valériane de Sitka sous-espčce des tourbičres
  Valeriana sitchensis var. uliginosa (Torr. & A. Gray) B. Boivin -- not accepted
  Valeriana uliginosa (Torr. & A. Gray) Rydb. -- not accepted -- mountain valerian
  Valerianella longiflora (Torr. & A. Gray) Walp. -- accepted -- longtube cornsalad, tubeflower cornsalad
  Valerianella nuttallii (Torr. & A. Gray) Walp. -- accepted -- Nuttall's cornsalad
  Valerianella woodsiana (Torr. & A. Gray) Walp. -- not accepted -- Woods' cornsalad
  Vallisneria spiralis var. americana (Michx.) Torr. -- not accepted
  Vallisneria spiralis var. asiatica (Michx.) Torr. -- not accepted
  Vanquelinia californica (Torr.) Sarg. -- not accepted
  Vauquelinia californica (Torr.) Sarg. -- accepted -- Arizona rosewood
  Vauquelinia californica ssp. californica (Torr.) Sarg. -- accepted -- Arizona rosewood, California rosewood
  Vernonia baldwinii Torr. -- accepted -- Baldwin's ironweed, interior ironweed, ironweed, western ironweed
  Vernonia baldwinii ssp. baldwinii Torr. -- not accepted -- Baldwin's ironweed
  Vernonia gigantea ssp. ovalifolia (Torr. & A. Gray) Urbatsch -- not accepted -- giant ironweed
  Vernonia marginata (Torr.) Raf. -- accepted -- ironplant, plains ironweed
  Vernonia ovalifolia Torr. & A. Gray -- not accepted
  Vesicaria grandiflora var. pallida Torr. & A. Gray -- not accepted
  Viburnum cassinoides var. angustifolium (Torr. & A. Gray) Shinners -- not accepted
  Viburnum dentatum var. scabrellum Torr. & A. Gray -- not accepted -- southern arrowwood
  Viburnum nudum var. angustifolium Torr. & A. Gray -- not accepted
  Viburnum nudum var. cassinoides (L.) Torr. & A. Gray -- accepted -- possumhaw, withe-rod
  Viburnum pauciflorum Bach. Pyl. ex Torr. & A. Gray -- not accepted
  Viburnum prunifolium var. ferrugineum Torr. & A. Gray -- not accepted
  Viburnum scabrellum (Torr. & A. Gray) Chapm. -- not accepted
  Vicia exigua var. californica Torr. -- not accepted
  Vicia leavenworthii Nutt. ex Torr. & A. Gray -- not accepted
  Vicia ludoviciana Nutt. ex Torr. & A. Gray -- accepted -- deerpea vetch, Louisiana vetch, slim vetch
  Vicia ludoviciana ssp. leavenworthii (Nutt. ex Torr. & A. Gray) Lassetter & C.R. Gunn -- not accepted -- Leavenworth's vetch
  Vicia ludoviciana ssp. ludoviciana Nutt. ex Torr. & A. Gray -- not accepted -- Louisiana vetch, slim vetch
  Vicia ludoviciana var. leavenworthii (Nutt. ex Torr. & A. Gray) Broich -- accepted -- Leavenworth's vetch
  Vicia ludoviciana var. ludoviciana Nutt. ex Torr. & A. Gray -- accepted -- Louisiana vetch
  Vicia ludoviciana var. texana (Torr. & A. Gray) Shinners -- not accepted
  Vicia micrantha Nutt. ex Torr. & A. Gray -- not accepted
  Vicia sparsifolia Nutt. ex Torr. & A. Gray -- not accepted
  Vicia texana (Torr. & A. Gray) Small -- not accepted
  Vilfa airoides (Torr.) Trin. ex Steud. -- not accepted
  Vilfa cryptandra (Torr.) Trin. -- not accepted
  Vilfa cuspidata Torr. ex Hook. -- not accepted
  Vilfa depauperata Torr. ex Hook. -- not accepted
  Vilfa serotina Torr. ex A. Gray -- not accepted
  Vilfa tricholepis Torr. -- not accepted
  Vilfa utilis Torr. -- not accepted
  Vilfa vaginiflora Torr. ex A. Gray -- not accepted
  Viola beckwithii Torr. & A. Gray -- accepted -- Beckwith's violet
  Viola beckwithii ssp. beckwithii Torr. & A. Gray -- not accepted -- Beckwith's violet
  Viola canadensis var. corymbosa Nutt. ex Torr. & A. Gray -- not accepted -- Canadian white violet
  Viola ocellata Torr. & A. Gray -- accepted -- pinto violet
  Viola pedunculata Torr. & A. Gray -- accepted -- Johnny-jump-up
  Viola pedunculata ssp. pedunculata Torr. & A. Gray -- accepted -- Johnny-jump-up
  Viola primulifolia var. acuta (Bigelow) Torr. & A. Gray -- not accepted
  Viola pubescens var. scabriuscula Torr. & A. Gray -- accepted -- downy yellow violet
  Viola sagittata var. ovata (Nutt.) Torr. & A. Gray -- accepted -- arrowleaf violet
  Viola sheltonii Torr. -- accepted -- Shelton's violet
  Viola shletonii Torr. -- not accepted
  Viorna baldwinii (Torr. & A. Gray) Small -- not accepted
  Viorna pitcheri (Torr. & A. Gray) Britton -- not accepted
  Waldsteinia lobata (Baldwin) Torr. & A. Gray -- accepted -- piedmont barren strawberry
  Waldstenia lobata (Baldwin) Torr. & A. Gray -- not accepted
  Washingtonia longistylis (Torr.) Britton -- not accepted
  Whipplea Torr. -- accepted
  Whipplea modesta Torr. -- accepted -- common whipplea
  Windsoria pallida Torr. -- not accepted
  Wisteria frutescens var. macrostachya Torr. & A. Gray -- not accepted
  Wisteria macrostachya (Torr. & A. Gray) Nutt. ex B.L. Rob. & Fernald -- not accepted
  Woodsia obtusa (Spreng.) Torr. -- accepted -- blunt-lobe woodsia, bluntlobe cliff fern, woodsie ŕ lobes arrondis
  Woodsia obtusa ssp. obtusa (Spreng.) Torr. -- accepted -- bluntlobe cliff fern
  Wyethia ovata Torr. & A. Gray ex Torr. -- not accepted -- southern mule-ears
  Xamesike depressa (Torr. ex Spreng.) Raf. -- not accepted
  Xanthisma texanum ssp. drummondii (Torr. & A. Gray) Semple -- not accepted -- Drummond's sleepydaisy
  Xanthisma texanum var. drummondii (Torr. & A. Gray) A. Gray -- accepted -- Drummond's sleepydaisy
  Xanthium strumarium var. canadense (Mill.) Torr. & A. Gray -- not accepted -- Canada cocklebur, Canada cockleburr, cocklebur, common cocklebur, rough cocklebur, rough cockleburr
  Xylorhiza tortifolia (Torr. & A. Gray) Greene -- accepted -- Mojave aster, Mojave woodyaster
  Xylorhiza tortifolia var. tortifolia (Torr. & A. Gray) Greene -- accepted -- Mojave aster, Mojave woodyaster
  Yeatesia platystegia (Torr.) Hilsenb. -- accepted -- Montell bractspike
  Yucca baccata Torr. -- accepted -- banana yucca, datil yucca, Izote de dátil
  Yucca baccata var. baccata Torr. -- accepted -- banana yucca
  Yucca baccata var. macrocarpa Torr. -- not accepted
  Yucca brevifolia Schott ex Torr. (pro. syn.) -- not accepted -- Joshua tree
  Yucca macrocarpa (Torr.) Coville -- not accepted
  Yucca puberula Torr. -- not accepted
  Yucca whipplei Torr. -- not accepted -- chaparral yucca, Izote de hoz
  Yucca whipplei var. whipplei Torr. -- not accepted -- chaparral yucca, whipple yucca
  Zamia inermis Vovides, J.D. Rees & Vázq. Torres -- accepted
  Zamia polymorpha D.W. Stev., A. Moretti & Vázq. Torres -- not accepted
  Zamia purpurea Vovides, J.D. Rees & Vázq. Torres -- accepted
  Zapoteca formosa var. schottii (Torr. ex S. Watson) H.M. Hern. -- accepted -- Schott's stickpea
  Zea mays var. precox Torr. -- not accepted
  Zeltnera beyrichii (Torr. & A. Gray) G. Mans. -- accepted -- mountain pink, quinineweed, rock centaury
  Zigadenus fremontii (Torr.) Torr. ex S. Watson -- not accepted -- Fremont's deathcamas
  Zigadenus fremontii var. fremontii (Torr.) Torr. ex S. Watson -- not accepted -- Fremont's deathcamas
  Ziziphus obtusifolia (Hook. ex Torr. & A. Gray) A. Gray -- accepted -- graythorn, Lote bush, lotebush
  Ziziphus obtusifolia var. obtusifolia (Hook. ex Torr. & A. Gray) A. Gray -- accepted -- graythorn, lotebush
  Ziziphus parryi Torr. -- accepted -- Parry's jujube
  Ziziphus parryi var. parryi Torr. -- not accepted -- lotebush
 
 Kingdom Bacteria
  Lactobacillus curvatus melibiosus Torriani et al., 1996 -- invalid
  Lactobacillus sakei carnosus Torriani et al., 1996 -- valid
  Lactococcus lactis hordniae (ex Latorre-Guzman et al., 1977) Schleifer et al., 1986 -- valid
  Propionibacterium lymphophilum (Torrey, 1916) Johnson and Cummins, 1972 -- invalid
  Propionimicrobium lymphophilum (Torrey, 1916) Stackebrandt et al., 2002 -- valid
 
 Kingdom Archaea
  Haloarcula Torreblanca et al., 1986 -- valid
  Haloarcula vallismortis (Gonzalez et al., 1979) Torreblanca et al., 1986 -- valid
  Haloferax Torreblanca et al., 1986 -- valid
  Haloferax mediterranei (Rodriguez-Valera et al., 1983) Torreblanca et al., 1987 -- valid
  Haloferax volcanii (Mullakhanbhai and Larsen, 1975) Torreblanca et al., 1986 -- valid
   

A gray bar