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Taxon author: DC.

ITIS records citing taxon author "DC."
 
 Kingdom Animalia
  Abythites lepidogenys (Smith and Radcliffe in Radcliffe, 1913) -- invalid
  Allocosa nanahuensis (Badcock, 1932) -- valid
  Anochetus mixtus Radchenko, 1993 -- valid
  Antennarius altipinnis Smith and Radcliff in Radcliff, 1912 -- invalid
  Antennarius rosaceus Smith and Radcliffe in Radcliffe, 1912 -- valid -- rosy frogfish
  Aphaenogaster dlusskyi Radchenko & Arakelian, 1991 -- valid
  Aphyocharax analialbis NODC, 1996 -- invalid
  Apogon albomarginata (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Apogon albomarginatus (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Apogon angustatus (Smith and Radcliffe in Radcliffe, 1911) -- valid -- broadstriped cardinalfish, broadstriped cardinalfish
  Apogon atrogaster (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Apogon compressus (Smith and Radcliffe in Radcliffe, 1911) -- valid
  Apogon diencaea (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Apogon diversus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Apogon nigrocincta (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Apogon nigrocinctus (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Apogon parvulus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Apogon robustus (Smith and Radcliffe in Radcliffe, 1911) -- invalid
  Apogon striatus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Apogon uninotatus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Barathrodemus nasutus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Bassobythites macropterus (Smith and Radcliffe in Radcliffe, 1913) -- invalid
  Bassozetus elongatus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Bassozetus robustus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Bathygadus filamentosus (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Bathygadus sulcatus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Bathyraja aguja (Kendall and Radcliffe, 1912) -- valid
  Bellottia armiger (Smith and Radcliffe in Radcliffe, 1913) -- valid
  Bothriomyrmex modestus Radchenko, 1985 -- valid
  Breda quinquedentata Badcock, 1932 -- valid
  Bythites lepidogenys Smith and Radcliffe in Radcliffe, 1913 -- invalid
  Caelorinchus acutirostris Smith and Radcliffe in Radcliffe, 1912 -- valid
  Caelorinchus argentatus Smith and Radcliffe in Radcliffe, 1912 -- valid -- silver whiptail
  Caelorinchus commutabilis Smith and Radcliffe in Radcliffe, 1912 -- valid
  Caelorinchus macrorhynchus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Caelorinchus notatus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Caelorinchus platorhynchus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Cataetyx lepidogenys (Smith and Radcliffe in Radcliffe, 1913) -- valid
  Cataglyphis machmal Radchenko & Arakelian, 1991 -- valid
  Centropyge multifasciata (Smith and Radcliffe, 1911) -- valid
  Centropyge multifasciatus (Smith and Radcliff, 1911) -- invalid
  Cerapachys foveolatus Radchenko, 1993 -- valid
  Cestracion peruanus Evermann and Radcliffe, 1917 -- invalid
  Chaetodon argentatus Smith and Radcliffe, 1911 -- valid
  Chalepoxenus tauricus Radchenko, 1989 -- valid
  Chalepoxenus zabelini Radchenko, 1989 -- valid
  Cheilodipterus nigrotaeniatus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Cheilodipterus zonatus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Chromis intercrusma Evermann and Radcliff, 1917 -- valid
  Cirrhoscyllium Smith and Radcliffe in Smith, 1913 -- valid
  Cirrhoscyllium expolitum Smith and Radcliffe in Smith, 1913 -- valid -- barbelthroat carpet shark, barbelthroat carpetshark, requin-carpette á moustache
  Coelophrys arca Smith and Radcliffe in Radcliffe, 1912 -- valid
  Coelophrys breviceps Smith and Radcliffe in Radcliffe, 1912 -- invalid
  Coelophrys brevipes Smith and Radcliffe in Radcliffe, 1912 -- valid
  Coelophrys mollis Smith and Radcliffe in Radcliffe, 1912 -- valid
  Coelophrys oblonga Smith and Radcliffe in Radcliffe, 1912 -- valid
  Colias tyche olga Churkin, Grieshuber, Bogdanov and Zamolodchikov, 2001 -- valid
  Coryphaenoides aequatoris (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Coryphaenoides asprellus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Coryphaenoides camurus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Coryphaenoides dubius (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Coryphaenoides microps (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Coryphaenoides orthogrammus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Coryphaenoides paradoxus Smith and Radcliffe in Radcliffe, 1912 -- invalid
  Corythalia cincta (Badcock, 1932) -- valid
  Crotalus lorenzoensis Radcliffe and Maslin, 1975 -- valid -- San Lorenzo Island Rattlesnake
  Crotalus ruber lorenzoensis Radcliffe and Maslin, 1975 -- invalid
  Cryptocercus kyebangensis Grandcolas, 2001 -- valid
  Cryptocercus matilei Grandcolas, 2000 -- valid
  Cyclothone parapallida Badcock, 1982 -- valid
  Dasypoda michezi Radchenko, 2017 -- valid
  Dasypoda morawitzi Radchenko, 2016 -- valid
  Deania profundorum (Smith and Radcliffe in Smith, 1912) -- valid -- arrowhead dogfish
  Dermatias Smith and Radcliffe in Radcliffe, 1912 -- valid
  Dermatias platynogaster Smith and Radcliffe in Radcliffe, 1912 -- valid
  Dero hylae Goodchild, 1951 -- valid -- aquatic oligochaete worm
  Dicrolene longimana Smith and Radcliffe in Radcliffe, 1913 -- valid
  Dicrolene tristis Smith and Radcliffe in Radcliffe, 1913 -- valid
  Diplacanthopoma brunnea Smith and Radcliffe in Radcliffe, 1913 -- valid
  Elgonocyclus Verdcourt, 1982 -- valid
  Emblemaria hudsoni Evermann and Radcliffe, 1917 -- valid
  Enchelybrotula Smith and Radcliffe in Radcliffe, 1913 -- valid
  Enchelybrotula paucidens Smith and Radcliffe in Radcliffe, 1913 -- valid
  Eretmichthys remifer Smith and Radcliffe in Radcliffe, 1913 -- invalid
  Etheostoma sellare (Radcliffe and Welsh, 1913) -- valid -- Maryland darter
  Etmopterus brachyurus Smith and Radcliffe in Smith, 1912 -- valid -- shorttail laternshark
  Eugerres periche (Evermann and Radcliffe, 1917) -- valid
  Eustala tribrachiata Badcock, 1932 -- valid
  Evermannichthys spongicola (Radcliffe, 1917) -- valid -- gobio esponjero, sponge goby
  Foa hyalina (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Gadomus filamentosus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Geolycosa albimarginata (Badcock, 1932) -- valid
  Girella nebulosa Kendall and Radcliffe, 1912 -- valid
  Glyptophidium lucidum Smith and Radcliffe in Radcliffe, 1913 -- valid
  Glyptophidium oceanicum Smith and Radcliffe in Radcliffe, 1913 -- invalid
  Glyptophidium oceanium Smith and Radcliffe in Radcliffe, 1913 -- valid
  Grammonus robustus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Halicmetus reticulatus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Halieutopsis simula (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Halieutopsis stellifera (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Halieutopsis vermicularis Smith and Radcliffe in Radcliffe, 1912 -- valid
  Heniochus singularius Smith and Radcliffe, 1911 -- valid -- Philippine kabubu
  Hephthocara crassiceps Smith and Radcliffe in Radcliffe, 1913 -- valid
  Holacanthus multifasciatus Smith and Radcliff, 1911 -- invalid
  Holcomycteronus aequatoris (Smith and Radcliffe in Radcliffe, 1913) -- valid
  Homostolus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Homostolus acer Smith and Radcliffe in Radcliffe, 1913 -- valid
  Hydrolagus deani Smith and Radcliffe in Smith, 1912 -- valid
  Hymenocephalus longiceps Smith and Radcliffe in Radcliffe, 1912 -- valid
  Hymenocephalus longipes Smith and Radcliffe in Radcliffe, 1912 -- valid
  Hymenocephalus striatissimus torvus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Hypopleuron Smith and Radcliffe in Radcliffe, 1913 -- valid
  Hypopleuron caninum Smith and Radcliffe in Radcliffe, 1913 -- valid
  Kuhlia nutabunda Kendall and Radcliffe, 1912 -- valid
  Kuronezumia macronema (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Latrodectus antheratus (Badcock, 1932) -- valid
  Lepidonectes corallicola (Kendall and Radcliffe, 1912) -- valid
  Leptothorax alinae Radchenko, 1993 -- valid
  Leptothorax iranicus Radchenko, 1993 -- valid
  Leptothorax janushevi Radchenko, 1993 -- valid
  Leptothorax kurilensis Radchenko, 1993 -- valid
  Leptothorax singularis Radchenko, 1993 -- valid
  Leptothorax tamarae Radchenko, 1993 -- valid
  Leptothorax werneri Radchenko, 1993 -- valid
  Leucauge atrostricta Badcock, 1932 -- valid
  Lopezus fedtschenkoi (McLachlan in Fedchenko, 1875) -- valid
  Lopezus fedtschenkoi fedtschenkoi (McLachlan in Fedchenko, 1875) -- valid
  Lophiodes infrabrunneus Smith and Radcliffe in Radcliffe, 1912 -- valid -- shortspine monkfish
  Lucigadus lucifer (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Lucigadus nigromarginata (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Lucigadus nigromarginatus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Luciobrotula Smith and Radcliffe in Radcliffe, 1913 -- valid
  Luciobrotula bartschi Smith and Radcliffe in Radcliffe, 1913 -- valid
  Macrouroides Smith and Radcliffe in Radcliffe, 1912 -- valid
  Macrouroides inflaticeps Smith and Radcliffe in Radcliffe, 1912 -- valid
  Macrouroidinae Smith and Radcliffe, 1912 -- valid
  Mantispa scabricollis McLachlan in Fedchenko, 1875 -- valid
  Maracanda amoena McLachlan in Fedchenko, 1875 -- valid
  Mastigopterus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Mastigopterus imperator Smith and Radcliffe in Radcliffe, 1913 -- valid
  Mastigopterus praetor Smith and Radcliffe in Radcliffe, 1913 -- invalid
  Mataeocephalus adustus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Mataeocephalus hyostomus (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Mataeocephalus nigrescens Smith and Radcliffe in Radcliffe, 1912 -- invalid
  Melitta budashkini Radchenko and Ivanov, 2012 -- valid
  Mesabolivar azureus (Badcock, 1932) -- valid
  Mesonemurus clarus (McLachlan in Fedchenko, 1875) -- valid
  Mesonemurus paulus (McLachlan in Fedchenko, 1875) -- valid
  Mirandia Badcock, 1932 -- valid
  Mirandia australis Badcock, 1932 -- valid
  Misumenops ignobilis (Badcock, 1932) -- valid
  Monomitopus garmani (Smith and Radcliffe in Radcliffe, 1913) -- valid
  Monomitopus longiceps Smith and Radcliffe in Radcliffe, 1913 -- valid
  Monomitopus microlepis Smith and Radcliffe in Radcliffe, 1913 -- valid
  Monomitopus pallidus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Mummucia dubia Badcock, 1932 -- valid
  Mustelus abbotti Evermann and Radcliffe, 1917 -- invalid
  Myrmarachne biseratensis Badcock, 1918 -- valid
  Myrmarachne cornuta Badcock, 1918 -- valid
  Myrmarachne cuneata Badcock, 1918 -- valid
  Myrmarachne gedongensis Badcock, 1918 -- valid
  Myrmarachne turriformis Badcock, 1918 -- valid
  Myrmecaelurus major McLachlan in Fedchenko, 1875 -- valid
  Myrmica pisarskii Radchenko, 1994 -- valid
  Myrmica transsibirica Radchenko, 1994 -- valid
  Myrmica tschekanovskii Radchenko, 1994 -- valid
  Myrmica zojae Radchenko, 1994 -- valid
  Nasisqualus Smith and Radcliff, 1912 -- invalid
  Nasisqualus profundorum Smith and Radcliffe in Smith, 1912 -- invalid
  Neamia Smith and Radcliffe in Radcliffe, 1912 -- valid
  Neamia octospina Smith and Radcliffe in Radcliffe, 1912 -- valid
  Neobythites fasciatus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Neobythites longiceps Smith and Radcliffe in Radcliffe, 1913 -- invalid
  Neobythites longipes Smith and Radcliffe in Radcliffe, 1913 -- valid
  Neobythites purus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Neobythites unimaculatus Smith and Radcliffe in Radcliffe, 1913 -- valid
  Neuroleon fanaticus (McLachlan in Fedchenko, 1875) -- valid
  Nezumia macronema (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Nezumia proxima (Smith and Radcliffe in Radcliffe, 1912) -- valid -- short-tail grenadier
  Nicholsina denticulata (Evermann and Radcliff, 1917) -- valid -- loosetooth parrotfish, pococho beriquete
  Nothroctenus Badcock, 1932 -- valid
  Nothroctenus stupidus Badcock, 1932 -- valid
  Nudiantennarius subteres (Smith and Radcliffe in Radcliffe, 1912) -- valid -- deepwater frogfish
  Oligopus robustus (Smith and Radcliffe in Radcliffe, 1913) -- invalid
  Pachycondyla mesoponeroides (Radchenko, 1993) -- valid
  Parateleopus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Parateleopus microstomus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Pareques fuscovittatus (Kendall and Radcliffe, 1912) -- valid -- festive drum, payasito lindo
  Pentanchus Smith and Radcliffe in Smith, 1912 -- valid
  Pentanchus profundicolus Smith and Radcliffe in Smith, 1912 -- valid -- onefin catshark
  Physiculus nigrescens Smith and Radcliffe in Radcliffe, 1912 -- invalid
  Physiculus nigriscens Smith and Radcliffe in Radcliffe, 1912 -- valid
  Plagiolepis karawajewi Radchenko, 1989 -- valid
  Platygillellus rubellulus (Kendall and Radcliffe, 1912) -- valid
  Plexippus luteus Badcock, 1932 -- valid
  Praealticus margaritatus (Kendall and Radcliffe, 1912) -- valid
  Psecas pulcher Badcock, 1932 -- valid
  Pseudonezumia parvipes (Smith and Radcliffe in Radcliffe, 1912) -- valid
  Pseudonus platycephalus (Smith and Radcliffe in Radcliffe, 1913) -- valid
  Pyramodon Smith and Radcliffe in Radcliffe, 1913 -- valid
  Pyramodon ventralis Smith and Radcliffe in Radcliffe, 1913 -- valid -- dogtooth pearlfish
  Pyromodon Smith and Radcliffe in Radcliffe, 1913 -- invalid
  Pyromodon ventralis Smith and Radcliffe in Radcliffe, 1913 -- invalid
  Schmardaella hylae (Goodchild, 1951) -- invalid
  Sebastes chamaco (Evermann and Radcliffe, 1917) -- invalid
  Simopone oculata Radchenko, 1993 -- valid
  Siphamia versicolor (Smith and Radcliffe in Radcliffe, 1911) -- valid
  Sladenia remiger Smith and Radcliffe in Radcliffe, 1912 -- valid -- Celebes monkfish
  Solenopsis nitidum (Dlussky & Radchenko, 1994) -- valid
  Squaliolus Smith and Radcliffe in Smith, 1912 -- valid -- spined pygmy sharks
  Squaliolus laticaudus Smith and Radcliffe in Smith, 1912 -- valid -- spined pigmy shark
  Strongylognathus arnoldii Radchenko, 1985 -- valid
  Strongylognathus chelifer Radchenko, 1985 -- valid
  Strongylognathus minutus Radchenko, 1991 -- valid
  Synagrops serratospinosus Smith and Radcliffe in Radcliffe, 1912 -- valid
  Teminius agalenoides (Badcock, 1932) -- valid
  Tetragnatha decipiens Badcock, 1932 -- valid
  Tetragnatha parva Badcock, 1932 -- valid
  Tetramorium aegeum Radchenko, 1992 -- valid
  Tetramorium bursakovi Radchenko, 1992 -- valid
  Tetramorium confine Radchenko & Arakelian, 1990 -- valid
  Tetramorium densopilosum Radchenko & Arakelian, 1990 -- valid
  Tetramorium vernicosum Radchenko, 1992 -- valid
  Thaumatichthys Smith and Radcliffe, 1912 -- valid
  Thaumatichthys pagidostomus Smith and Radcliffe, 1912 -- valid
  Ventrifossa lucifer (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Ventrifossa nigromarginata (Smith and Radcliffe in Radcliffe, 1912) -- invalid
  Xenoscarus Evermann and Radcliff, 1917 -- invalid
  Xenoscarus denticulatus Evermann and Radcliff, 1917 -- invalid
 
 Kingdom Fungi
  Collema nigrescens (Huds.) DC. -- accepted
  Gymnosporangium R. Hedw. ex DC. -- accepted
  Lecanora populicola (DC.) Duby -- accepted
  Lithoglypha tesserata (DC.) Nyl. -- accepted
  Lithographa tesserata (DC.) Nyl. -- accepted
  Lobaria scorbiculata (Scop.) DC. -- accepted
  Peltigera spuria (Ach.) DC. -- accepted
  Pertusaria DC. -- accepted
  Physcia tenella (Scop.) DC. -- accepted
  Puccinia asparagi DC. -- accepted -- asparagus rust
  Rhizocarpon Ramond ex DC. -- accepted
  Rhizoplaca melanophthalma (DC.) Leuckert -- accepted
  Sargogyne clavus (DC.) Kremp. -- accepted
  Tephromela armeniaca (DC.) Hertel & Rambold -- accepted
  Tilletia caries (DC.) Tul. & C. Tul. -- accepted
  Umbillicaria leiocarpa DC. -- accepted
  Ustilago maydis (DC.) Corda -- accepted -- corn smut
 
 Kingdom Plantae
  Acacia amentacea DC. -- not accepted
  Acacia binervata DC. -- accepted -- two-vein-hickory
  Acacia hebeclada DC. -- accepted
  Acacia macracanthoides Bertero ex DC. -- not accepted
  Acacia oxycedrus Sieber ex DC. -- accepted
  Acacia paradoxa DC. -- accepted -- acacia-hedge, kangaroo thorn, kangaroo-thorn, kangaroothorn, paradox acacia, prickly acacia
  Acacia penninervis Sieber ex DC. -- accepted -- blackwood, mountain-hickory
  Acacia pyrifolia DC. -- accepted
  Acacia sieberiana DC. -- accepted
  Acacia westiana DC. -- not accepted
  Acanthocereus undulosus (DC.) Croizat -- not accepted
  Acanthospermum hispidum DC. -- accepted -- bristly starbur, hispid starbur, hispid starburr
  Acanthospermum humile (Sw.) DC. -- accepted -- low starbur, low starburr
  Acanthospermum xanthioides DC. -- not accepted -- southern starburr
  Acer negundo var. mexicanum (DC.) Kuntze -- accepted
  Achillea conferta DC. -- accepted
  Achillea dentifera DC. -- not accepted
  Achillea millefolium ssp. occidentalis (DC.) Hyl. -- not accepted
  Achillea millefolium var. gracilis (Raf.) Raf. ex DC. -- not accepted
  Achillea millefolium var. occidentalis DC. -- not accepted -- common yarrow, western yarrow
  Achillea occidentalis (DC.) Raf. ex Rydb. -- not accepted
  Achimenes andrieuxii DC. -- not accepted
  Achimenes antirrhina (DC.) C.V. Morton -- accepted
  Achimenes comifera DC. -- not accepted
  Achimenes erinoides DC. -- not accepted
  Achimenes grandiflora (Schiede) DC. -- accepted
  Achimenes heterophylla (Mart.) DC. -- accepted
  Achimenes hirsuta DC. -- not accepted
  Achimenes longiflora DC. -- accepted
  Achimenes tenella DC. -- not accepted
  Achlys DC. -- accepted -- vanillaleaf
  Achlys triphylla (Sm.) DC. -- accepted -- deer-foot, deervetch vanillaleaf, sweet after death, vanillaleaf
  Achlys triphylla ssp. triphylla (Sm.) DC. -- not accepted -- deer foot, vanillaleaf
  Aconitum delphinifolia DC. -- not accepted
  Aconitum delphiniifolium DC. -- accepted
  Aconitum delphiniifolium DC. -- not accepted -- larkspurleaf monkshood
  Aconitum delphiniifolium ssp. delphiniifolium DC. -- not accepted -- larkspurleaf monkshood
  Aconitum maximum Pall. ex DC. -- accepted -- Kamchatka aconite
  Aconitum maximum ssp. maximum Pall. ex DC. -- accepted -- Kamchatka aconite
  Aconitum uncinatum ssp. muticum (DC.) Hardin -- not accepted -- southern blue monkshood
  Aconitum uncinatum var. muticum DC. -- not accepted
  Acourtia microcephala DC. -- accepted -- sacapellote
  Acroptilon repens (L) DC -- not accepted -- hardheads, Russian knapweed, Turestan thistle
  Actaea cordifolia DC. -- accepted -- Appalachian bugbane
  Actaea podocarpa DC. -- accepted -- mountain bugbane
  Actinea canescens (D.C. Eaton) S.F. Blake -- not accepted
  Actinomeris alternifolia (L) DC -- not accepted
  Actinomeris helianthoides var. elliottii DC. -- not accepted
  Actinomeris helianthoides var. nuttallii DC. -- not accepted
  Actinomeris oppositifolia DC. -- not accepted
  Adenocarpus DC. -- accepted
  Adenocarpus foliolosus (Aiton) DC. -- accepted -- Canary Island flatpod
  Adenophorus abietinus (D.C. Eaton) K.A. Wilson -- accepted -- elegant kihifern
  Adenostemma berterii DC. -- not accepted
  Adenostemma berteroi DC. -- accepted
  Adesmia DC. -- accepted
  Adesmia bicolor (Poir.) DC. -- accepted -- alverjilla, babosita, patope
  Adesmia muricata (Jacq.) DC. -- accepted
  Adlumia Raf. ex DC. -- accepted
  Aegopogon tenellus (DC.) Trin. -- not accepted -- fragile grass, fragilegrass
  Aeschynanthus acuminatus Wall. ex A. DC. -- accepted
  Aeschynanthus bracteatus Wall. ex DC. -- accepted
  Aeschynanthus longiflorus (Blume) A. DC. -- accepted
  Aeschynanthus perrottetii A. DC. -- accepted
  Aeschynanthus perrottetii var. perrottetii A. DC. -- accepted
  Aeschynomene brasiliana (Poir.) DC. -- accepted
  Aeschynomene falcata (Poir.) DC. -- accepted -- Australian joint-vetch
  Aesculus X hybrida DC. (pro. sp.) -- accepted -- hybrid chestnut
  Agarista calliopsidea DC. -- not accepted
  Agdestis Moc. & Sessé ex DC. -- accepted
  Agdestis clematidea Moc. & Sessé ex DC. -- accepted -- rockroot
  Agoseris glauca var. laciniata (D.C. Eaton) Smiley -- not accepted -- Arizona mountain dandelion, false agoseris
  Agropyron junceum var. obtusiflorum (DC.) K. Richt. -- not accepted
  Agropyron obtusiflorum (DC.) Roem. & Schult. -- not accepted
  Agrostis coerulescens (Desf.) Lam. ex DC. -- not accepted
  Agrostis rubicunda Bosc ex DC. -- not accepted
  Albizia lebbekoides (DC.) Benth. -- accepted -- Indian albizia
  Albizia zygia (DC.) J.F. Macbr. -- accepted -- albizia
  Alisma gramineum var. angustissimum (DC.) A.J. Hendricks -- not accepted
  Allamanda blanchetii A. DC. -- accepted -- purple allamanda
  Allophylus timorensis (DC.) Blume -- accepted
  Alloplectus angustifolius DC. -- not accepted
  Alloplectus dichrous (Spreng.) DC. -- not accepted
  Alloplectus glaber DC. -- not accepted
  Alloplectus patrisii DC. -- not accepted
  Alnus viridis (Chaix) DC. -- not accepted
  Alnus viridis (Chaix) DC. -- accepted -- green alder
  Alsobia antirrhina (DC.) Oerst. -- not accepted
  Alsophila balanocarpa (D.C. Eaton) D.S. Conant -- not accepted
  Alsophila minor (D.C. Eaton) R.M. Tryon -- not accepted
  Alternanthera sessilis (L.) R. Br. ex DC. -- accepted -- sessile joyweed
  Alysicarpus glumaceus (Vahl) DC. -- accepted
  Alysicarpus rugosus (Willd.) DC. -- accepted -- red moneywort
  Alysicarpus vaginalis (L.) DC. -- accepted -- white moneywort
  Amberboa moschata (L) DC -- accepted -- sweetsultan
  Amblyolepis DC. -- accepted -- amblyolepis
  Amblyolepis setigera DC. -- accepted -- huisache daisy, huisachedaisy
  Ambrosia aptera DC. -- not accepted
  Ambrosia confertiflora DC. -- accepted -- ragweed, weakleaf bur ragweed, weakleaf burr ragweed
  Ambrosia psilostachya DC. -- accepted -- Cuman ragweed, perennial ragweed, western ragweed
  Ambrosia trifida var. aptera (DC.) Kuntze -- not accepted
  Amelanchier sanguinea (Pursh) DC. -- accepted -- Huron serviceberry, roundleaf juneberry, roundleaf serviceberry, shore shadbush
  Amelanchier sanguinea var. sanguinea (Pursh) DC. -- not accepted -- roundleaf serviceberry
  Amoreuxia Moc. & Sessé ex DC. -- accepted -- throwup weed, yellowshow
  Amoreuxia palmatifida DC. -- accepted -- Mexican yellowshow, throwup weed
  Amphiachyris (A. DC.) Nutt. -- accepted -- amphiachyris, broomweed
  Amphiachyris dracunculoides (DC.) Nutt. -- accepted -- common broomweed, prairie broomweed
  Amphilophis argentea (DC.) Roshev. -- not accepted
  Amsinckia douglasiana A. DC. -- accepted -- Douglas' fiddleneck
  Anacampseros telephiastrum DC. -- accepted
  Anacyclus tomentosus DC. -- not accepted
  Anacylus tomentosus DC. -- not accepted
  Anaphalis DC. -- accepted -- anaphalis, pearly everlasting, pearlyeverlasting
  Anaxagorea acuminata (Dunal) A. DC. -- accepted
  Andira inermis (W. Wright) Kunth ex DC. -- accepted -- cabbagebark tree
  Andromeda polifolia var. glaucophylla (Link) DC. -- not accepted -- bog rosemary
  Andropogon argenteus DC. -- not accepted
  Andropogon citratus DC. ex Nees -- not accepted
  Andropogon laguroides DC. -- not accepted
  Andropogon saccharoides ssp. laguroides (DC.) Hack. -- not accepted
  Andropogon saccharoides subvar. argenteus (DC.) Hack. -- not accepted
  Andropogon saccharoides var. laguroides (DC.) Hack. -- not accepted
  Anemonastrum narcissiflorum ssp. villosissimum (DC.) Á. Löve & D. Löve -- not accepted
  Anemone acutiloba (DC.) G. Lawson -- accepted -- sharplobe hepatica
  Anemone americana (DC.) H. Hara -- accepted -- roundlobe hepatica
  Anemone hudsoniana (DC.) Richardson -- not accepted
  Anemone minima DC. -- not accepted
  Anemone multifida var. hudsoniana DC. -- not accepted -- Hudson's anemone
  Anemone narcissiflora ssp. villosissima (DC.) Hultén -- not accepted
  Anemone narcissiflora ssp. villosissima (DC.) Hultén -- not accepted
  Anemone narcissiflora var. monantha DC. -- accepted -- narcissus anemone
  Anemone narcissiflora var. monantha DC. -- not accepted
  Anemone narcissiflora var. villosissima DC. -- accepted -- narcissus anemone
  Anemone nuttalliana DC. -- not accepted
  Anemone patens var. nuttalliana (DC.) A. Gray -- not accepted
  Anemone quinquefolia var. minima (DC.) Frodin -- accepted -- nightcaps
  Angadenia berteroi (A. DC.) Miers -- accepted -- pineland golden trumpet
  Angadenia sagrae (A. DC.) Miers -- not accepted
  Anigozanthos flavidus DC. -- accepted
  Anneslea haematostoma (Bertero ex DC.) Britton -- not accepted
  Anneslia haematomma (Bertero ex DC.) Britton -- not accepted
  Anoda acerifolia auct. non (Zucc. ex Roem. & Schult.) DC. -- not accepted
  Anogeissus (DC.) Wall. ex Guillem. & Perr. -- accepted
  Anogeissus latifolia (Roxb. ex DC.) Wall. ex Guill. & Perr. -- accepted
  Anogeissus latifolia (Roxb. ex DC.) Wall. ex Bedd. -- not accepted -- gum ghatti
  Antennaria dimorpha var. macrocephala D.C. Eaton -- not accepted
  Antennaria dioica var. rosea (Greene) D.C. Eaton -- not accepted
  Antennaria macrocephala (D.C. Eaton) Rydb. -- not accepted
  Antennaria monocephala DC. -- accepted -- pygmy pussytoes
  Antennaria monocephala (Torr. & A. Gray) Greene non Antennaria monocephala DC. -- not accepted
  Antennaria monocephala ssp. monocephala DC. -- accepted -- pygmy pussytoes
  Anthemis arvensis var. agrestis (Wallr.) DC. -- not accepted -- corn chamomile
  Anthyllis polyphylla (DC.) Kit. ex G. Don -- not accepted
  Anthyllis vulneraria ssp. polyphylla (DC.) Nyman -- not accepted
  Antiphytum DC. ex Meisn. -- accepted -- saucerflower
  Antiphytum cruciatum (Cham.) DC. -- accepted
  Antiphytum heliotropioides A. DC. -- accepted -- Mexican saucerflower
  Antirhea acutata (DC.) Urb. -- not accepted -- placa chiquitu
  Antirrhinum coulterianum Benth. ex A. DC. -- not accepted
  Antirrhinum nuttallianum Benth. ex A. DC. -- not accepted
  Antirrhinum nuttallianum ssp. nuttallianum Benth. ex A. DC. -- not accepted -- snapdragon
  Aphanostephus DC. -- accepted -- doze daisy, dozedaisy
  Aphanostephus ramosissimus DC. -- accepted -- plains dozedaisy
  Aphanostephus ramosissimus var. ramosissimus DC. -- accepted -- plains dozedaisy
  Aphanostephus skirrhobasis (DC.) Trel. -- accepted -- Arkansas dozedaisy
  Aphanostephus skirrhobasis var. skirrhobasis (DC.) Trel. -- accepted -- Arkansas dozedaisy
  Aphragmus Andrz. ex DC. -- accepted
  Aphragmus eschscholtzianus Andrz. ex DC. -- accepted -- Aleutian cress
  Apiastrum patens (Nutt. ex DC.) J.M. Coult. & Rose -- not accepted
  Apium echinatum (Nutt. ex DC.) Benth. & Hook. f. ex S. Watson -- not accepted
  Apium graveolens var. dulce (Mill.) DC. -- accepted -- wild celery
  Apocynum androsaemifolium ssp. androsaemifolium var. incanum A. DC. -- not accepted -- spreading dogbane
  Apocynum androsaemifolium var. incanum A. DC. -- not accepted
  Apocynum cannabinum var. glaberrimum A. DC. -- not accepted
  Apocynum cannabinum var. pubescens (R. Br.) A. DC. -- not accepted
  Aporocactus leptophis (DC.) Britton & Rose -- not accepted
  Aquilaria secundaria Rumph. ex DC. -- not accepted
  Aquilegia formosa Fisch. ex DC. -- accepted -- crimson columbine, western columbine
  Aquilegia formosa var. formosa Fisch. ex DC. -- accepted -- crimson columbine
  Arabidopsis lyrata ssp. kamchatica (Fisch. ex DC.) O'Kane & Al-Shehbaz -- accepted -- Kamchatka rockcress
  Arabis kamchatica (Fisch. ex DC.) Ledeb. -- not accepted -- Kamchatka rockcress
  Arabis lyrata ssp. kamchatica (Fisch. ex DC.) Hultén -- not accepted
  Arabis lyrata var. glabra (DC.) M. Hopkins -- not accepted
  Arabis lyrata var. kamchatica Fisch. ex DC. -- not accepted -- Kamchatka rockcress
  Arabis lyrifolia DC. -- not accepted
  Arceuthobium oxycedri (DC.) M. Bieb. -- accepted
  Arctostaphylos bracteosa (DC.) Abrams -- not accepted
  Arctostaphylos bracteosa var. hebeclada (DC.) Eastw. -- not accepted
  Arctostaphylos tomentosa ssp. bracteosa (DC.) J.E. Adams -- accepted -- bracteose manzanita, woollyleaf manzanita
  Arctostaphylos tomentosa ssp. hebeclada (DC.) V.T. Parker, M.C. Vasey & J.E. Keeley -- accepted -- woollyleaf manzanita, woollytwig manzanita
  Arctostaphylos tomentosa var. hebeclada (DC.) J.E. Adams -- not accepted
  Arctostaphylos tomentosa var. trichoclada (DC.) Munz -- not accepted
  Ardisia crispa (Thunb.) A. DC. -- accepted
  Ardisia polycephala auct. non Wall. ex A. DC. -- not accepted
  Arenaria stricta var. uliginosa (Schleich. ex Lam. & DC.) B. Boivin -- not accepted
  Arenaria uliginosa Schleich. ex Lam. & DC. -- not accepted
  Arenga saccharifera Labill. ex DC. -- not accepted
  Argyroxiphium DC. -- accepted -- silversword
  Argyroxiphium sandwicense DC. -- accepted -- Hawai'i silversword
  Argyroxiphium sandwicense ssp. sandwicense DC. -- accepted -- `ahinahina, Hawai'i silversword, Mauna Kea silversword
  Arnica longifolia D.C. Eaton -- accepted -- longleaf arnica, spearleaf arnica
  Arrabidaea DC. -- accepted
  Arrabidaea rego (Vell.) DC. -- accepted
  Arracacia esculenta DC. -- not accepted
  Artemisia pycnocephala (Less.) DC. -- accepted -- beach wormwood
  Artemisia spinescens D.C. Eaton -- not accepted -- bud sagebrush
  Asplenium bradleyi D.C. Eaton -- accepted -- Bradley's spleenwort
  Asplenium platyneuron var. proliferum (D.C. Eaton) Tanger -- not accepted -- ebony spleenwort
  Asplenium X biscaynianum (D.C. Eaton) A.A. Eaton (pro sp.) -- accepted -- Biscayne spleenwort
  Aster ascendens var. parryi D.C. Eaton -- not accepted
  Aster caerulescens DC. -- not accepted
  Aster coerulescens DC. -- not accepted
  Aster diplostephioides (DC.) C.B. Clarke -- accepted
  Aster elegans var. engelmannii D.C. Eaton -- not accepted
  Aster engelmannii (D.C. Eaton) A. Gray -- not accepted
  Aster foliaceus auct. non Lindl. ex DC. -- not accepted -- alpine leafybract aster
  Aster foliaceus Lindl. ex DC. -- not accepted
  Aster foliaceus var. foliaceus Lindl. ex DC. -- not accepted -- alpine leafybract aster
  Aster foliaceus var. parryi (D.C. Eaton) A. Gray -- not accepted -- Parry's aster
  Aster foliaceus var. sublinearis D.C. Eaton & Grisc. -- not accepted
  Aster gymnocephalus auct. non (DC.) A. Gray -- not accepted
  Aster hirsuticaulis Lindl. ex DC. -- not accepted
  Aster kingii D.C. Eaton -- not accepted
  Aster kingii var. kingii D.C. Eat. -- not accepted -- King's aster
  Aster lateriflorus var. hirsuticaulis (Lindl. ex DC.) Porter -- not accepted -- calico aster
  Aster lutescens (Lindl. ex DC.) Torr. & A. Gray -- not accepted
  Aster patens var. patentissimus (Lindl. ex DC.) Torr. & A. Gray -- not accepted -- late purple aster
  Aster patentissimus Lindl. ex DC. -- not accepted
  Aster praealtus var. caerulescens (DC.) A.G. Jones -- not accepted
  Aster praealtus var. coerulescens (DC.) A.G. Jones -- not accepted -- willowleaf aster
  Aster ptarmicoides var. lutescens (Lindl. ex DC.) A. Gray -- not accepted
  Aster pyrenaeus Desf. ex DC. -- accepted
  Aster retroflexus Lindl. ex DC. -- not accepted -- rigid aster
  Aster sericeus var. microphyllus DC. -- not accepted -- western silver aster
  Aster subulatus var. cubensis (DC.) Shinners -- not accepted -- annual saltmarsh aster
  Aster urophyllus Lindl. ex DC. -- not accepted -- white arrow aster
  Astragalus alpinus var. labradoricus (DC.) Fernald -- not accepted
  Astragalus astragalinus (DC.) E. Sheld. -- not accepted
  Astragalus danicus var. dasyglottis (Fisch. ex DC.) B. Boivin -- not accepted
  Astragalus dasyglottis Fisch. ex DC. -- not accepted
  Astragalus fraxinifolius DC. -- accepted
  Astragalus glycyphylloides DC. -- accepted
  Astragalus inflatus DC. -- accepted
  Astragalus mexicanus A. DC. -- not accepted
  Astragalus nuttallianus DC. -- accepted -- Nuttall milkvetch, smallflowered milkvetch
  Astragalus nuttallianus var. nuttallianus DC. -- accepted -- smallflowered milkvetch
  Astragalus semibilocularis DC. -- not accepted
  Astragalus sericea auct. non DC., non Lam. -- not accepted
  Astragalus stevenianus DC. -- accepted
  Astripomoea grantii (Rendle) Verdc. -- accepted
  Astripomoea hyoscyamoides (Vatke) Verdc. -- accepted
  Astrophytum ornatum (DC.) Britton & Rose -- accepted
  Atriplex prostrata Boucher ex DC. -- accepted -- hastate orache, triangle orache
  Aubrieta deltoidea (L.) DC. -- accepted -- lilacbush
  Babactes oblongifolia (Roxb.) DC. -- not accepted
  Baccharis douglasii DC. -- accepted -- saltmarsh baccharis
  Baccharis halimifolia var. angustior DC. -- not accepted
  Baccharis pilularis DC. -- accepted -- coyotebrush
  Baccharis pilularis ssp. consanguinea (DC.) C.B. Wolf -- accepted
  Baccharis pilularis ssp. pilularis DC. -- accepted -- coyotebrush
  Baccharis pilularis var. consanguinea (DC.) Kuntze -- not accepted
  Baccharis pilularis var. pilularis DC. -- not accepted
  Baccharis pteronioides DC. -- accepted -- yerba de pasmo, yerba-de-pasmo
  Baccharis speciosa D.C. -- not accepted
  Baccharis viminea DC. -- not accepted
  Badiera DC. -- accepted
  Badiera penaea (L.) DC. -- accepted
  Baeria chrysostoma ssp. gracilis (DC.) Ferris -- not accepted
  Baeria chrysostoma var. gracilis (DC.) H.M. Hall -- not accepted
  Baeria microglossa (DC.) Greene -- not accepted
  Baeria minor (DC.) Ferris -- not accepted
  Banisteria floribunda DC. -- not accepted
  Barbieria DC. -- accepted
  Bauhinia multinervia (Kunth) DC. -- accepted -- petite flamboyant bauhinia
  Begonia convolvulacea (Klotzsch) A. DC. -- accepted -- morning-glory begonia
  Begonia cucullata var. hookeri (A. DC.) L.B. Sm. & B.G. Schub. -- not accepted
  Begonia decandra Pav. ex A. DC. -- accepted -- native begonia
  Belamcanda chinensis (L.) DC. -- not accepted -- blackberry lily
  Berberis thunbergii DC. -- accepted -- Japanese barberry
  Berchemia Neck. ex DC. -- accepted -- supplejack
  Berlandiera DC. -- accepted -- berlandiera, greeneyes
  Berlandiera texana DC. -- accepted -- Texas greeneyes
  Berteroa DC. -- accepted -- false madwort
  Berteroa incana (L.) DC. -- accepted -- hoary alyssum, hoary false alyssum, hoary false madwort
  Berteroa mutabilis (Vent.) DC. -- accepted -- roadside false madwort
  Berteroa obliqua (Sm.) DC. -- accepted
  Berula thunbergii (DC.) H. Wolff -- not accepted
  Besleria berteriana DC. -- not accepted
  Besleria cristata Sessé & Moc. ex DC. -- not accepted
  Besleria guadalupensis DC. -- not accepted
  Besleria patrisii DC. -- accepted
  Bidens alba (L) DC -- not accepted
  Bidens alba (L) DC -- not accepted
  Bidens bigelovii var. angustiloba (DC.) Ballard ex T.E. Melchert -- not accepted
  Bidens cernua var. radiata DC. -- not accepted
  Bidens ferulifolia (Jacq.) DC. -- not accepted -- Apache beggarticks
  Bigelowia DC. -- accepted -- rayless goldenrod
  Bigelowia nudata (Michx.) DC. -- accepted -- pineland rayless goldenrod
  Bigelowia nudata ssp. nudata (Michx.) DC. -- not accepted -- pineland rayless goldenrod
  Bigelowia nudata var. nudata (Michx.) DC. -- accepted -- pineland rayless goldenrod
  Bigelowia virgata (Nutt.) DC. -- not accepted
  Biophytum DC. -- accepted
  Biophytum dendroides (Kunth) DC. -- accepted
  Bletia purpurea (Lam.) DC. -- accepted -- Bletia común, pinepink
  Blumea DC. -- accepted -- false oxtongue
  Blumea balsamifera (L) DC -- accepted -- nagi camphor, ngai camphor
  Blumea lacera (Burm. f.) DC. -- accepted -- blumea
  Blumea laciniata (Roxb.) DC. -- accepted -- cutleaf false oxtongue
  Bombax malabaricum DC. -- not accepted
  Bombycilaena DC. -- accepted
  Bonellia umbellata (A. DC.) B. Stĺhl & Källersjö -- accepted
  Borreria alata (Aubl.) DC. -- not accepted
  Borreria densiflora DC. -- not accepted
  Borreria ocymoides auct. non (Burm. f.) DC. -- not accepted
  Borreria repens auct. non DC. -- not accepted
  Borrichia arborescens (L) DC -- accepted -- tree seaside tansy
  Borrichia frutescens (L) DC -- accepted -- bushy seaoxeye, bushy seaside tansy
  Bothriochloa laguroides (DC.) Herter -- accepted -- silver beardgrass
  Bothriochloa laguroides (DC.) Pilg. -- not accepted
  Bothriochloa laguroides ssp. laguroides (DC.) Herter -- not accepted -- silver beardgrass
  Bothriochloa laguroides var. laguroides (DC.) Herter -- accepted
  Bothriochloa saccharoides var. laguroides (DC.) Beetle -- not accepted
  Botrychium multifidum var. intermedium (D.C. Eaton) Farw. -- not accepted
  Bouchetia DC. ex Dunal -- accepted
  Bouchetia erecta DC. ex Dunal -- not accepted -- paintedtongue
  Bourreria domingensis (DC.) Griseb. -- accepted
  Bourreria domingensis auct. non (DC.) Griseb. -- not accepted
  Brachyris dracunculoides DC. -- not accepted
  Brachyris microcephala DC. -- not accepted
  Brachythecium washingtonianum D.C. Eat. in Grout -- not accepted
  Bracyrhamphus intybaceus (Jacq.) DC. -- not accepted
  Brassica campestris var. oleifera DC. -- not accepted
  Brassica caulorapa (DC.) Pasq. -- not accepted
  Brassica kaber (DC.) L.C. Wheeler -- not accepted -- canola, charlock mustard, kaber mustard, rapeseed, wild mustard
  Brassica napus var. pabularia (DC.) Rchb. -- not accepted -- Siberian kale
  Brassica oleracea var. acephala DC. -- not accepted -- cabbage
  Brassica oleracea var. caulorapa DC. -- not accepted
  Brassica oleracea var. costata DC. -- not accepted -- tronchuda cabbage
  Brassica oleracea var. gemmifera DC. -- not accepted -- brussels sprouts
  Brassica rapa ssp. olifera DC. -- not accepted
  Brassica rapa var. oleifera DC. -- not accepted
  Brauneria angustifolia (DC.) A. Heller -- not accepted
  Brickellia dentata (DC.) Sch. Bip. -- accepted -- leafy brickellbush, leafy brickellia
  Brickellia linifolia D.C. Eaton -- not accepted
  Brickellia oblongifolia var. linifolia (D.C. Eaton) B.L. Rob. -- accepted -- narrow leaf brickellbush, narrowleaf brickellbush
  Bromus grossus Desf. ex DC. -- accepted -- whiskered brome
  Bromus secalinus ssp. grossus (Desf. ex DC.) Domin -- not accepted
  Bromus secalinus var. grossus (Desf. ex DC.) Neilr. -- not accepted
  Bruchia longicollis D.C. Eat. -- not accepted
  Brya ebenus (L.) DC. -- accepted -- ebony coccuswood
  Brysonima coriacea (Sw.) DC. -- not accepted
  Bulliarda aquatica (L.) DC. -- not accepted
  Bumelia obovata (Lam.) A. DC. -- not accepted
  Bunchosia glandulosa (Cav.) DC. -- accepted -- cafe forastero
  Bunchosia nitida auct. non (Jacq.) DC. -- not accepted -- woodland coffee
  Bunchosia polystachia (Andrews) DC. -- accepted -- woodland coffee
  Buxbaumia viridis (DC.) Moug. & Nestl. -- accepted -- buxbaumia moss
  Byrsonima coriacea (Sw.) DC. -- not accepted
  Byrsonima lucida (Mill.) DC. -- accepted -- Key byrsonima, Long Key locustberry, Maricao cimarron
  Byrsonima spicata (Cav.) DC. -- accepted -- doncella, Maricao cimarron
  Cacalia auriculata DC. -- not accepted -- cacalia
  Cactus phyllanthoides DC. -- not accepted
  Calamagrostis acutiflora (Schrad.) DC. -- not accepted
  Calamagrostis sylvatica (Schrad.) DC. -- not accepted
  Calamagrostis X acutiflora (Schrad.) DC. -- accepted
  Calandrinia ciliata (Ruiz & Pav.) DC. -- accepted -- desert rockpurslane, fringed redmaids, redmaids
  Callaeum macropterum (DC.) D.M. Johnson -- accepted -- aparigua, gallinita, guirote, hillyhock
  Calliandra haematomma (Bertero ex DC.) Benth. -- accepted -- red powderpuff
  Calliandra haematomma var. haematomma (Bertero ex DC.) Benth. -- accepted -- red powderpuff
  Callistemon lanceolatus (Sw.) DC. -- not accepted
  Callistemon pallidus (Bonpl.) DC. -- accepted -- lemon bottlebrush
  Callistemon rugulosus (D.F.K. Schltdl. ex Link) DC. -- accepted -- scarlet bottlebrush
  Callistemon sieberi DC. -- accepted -- river bottlebrush
  Callistopteris baldwinii (D.C. Eaton) Copel. -- accepted
  Calophaca Fisch. ex DC. -- accepted
  Calophaca wolgarica (L. f.) Fisch. ex DC. -- accepted
  Calosacme oblongifolia (Roxb.) DC. -- not accepted
  Caltha asarifolia DC. -- not accepted
  Caltha biflora DC. -- not accepted
  Caltha leptosepala DC. -- accepted -- elkslip marshmarigold, slendersepal marshmarigold, white marsh marigold, white marsh-marigold, white marshmarigold
  Caltha leptosepala ssp. biflora (DC.) P.G. Smit -- not accepted
  Caltha leptosepala ssp. leptosepala DC. -- not accepted -- white marsh marigold, white marsh-marigold, white marshmarigold
  Caltha leptosepala ssp. leptosepala var. leptosepala DC. -- not accepted -- white marsh marigold, white marshmarigold
  Caltha leptosepala var. biflora (DC.) G. Lawson -- not accepted
  Caltha leptosepala var. leptosepala DC. -- not accepted -- white marsh marigold
  Caltha natans var. asarifolia (DC.) Huth -- not accepted
  Caltha palustris ssp. asarifolia (DC.) Hultén -- not accepted
  Caltha palustris var. asarifolia (DC.) Huth -- not accepted
  Calycadenia DC. -- accepted -- western rosinweed
  Calycadenia multiglandulosa DC. -- accepted -- sticky western rosinweed
  Calycadenia multiglandulosa DC. -- not accepted
  Calycadenia multiglandulosa ssp. cephalotes (DC.) D.D. Keck -- not accepted
  Calycadenia truncata DC. -- accepted -- Oregon western rosinweed
  Calycadenia truncata ssp. truncata DC. -- accepted -- Oregon western rosinweed
  Calycadenia villosa DC. -- accepted -- dwarf western rosinweed
  Calycogonium DC. -- accepted -- angleflower
  Calycophyllum DC. -- accepted
  Calycophyllum candidissimum (Vahl) DC. -- accepted -- degame
  Camelina microcarpa DC. -- accepted -- little-pod false flax, littlepod false flax, littlepod falseflax, littleseed falseflax, small fruited falseflax, smallseed falseflax
  Camelina sativa ssp. microcarpa (Andrz. ex DC.) E. Schmid -- not accepted
  Campanula aucheri A. DC. -- not accepted
  Campanula bellidifolia ssp. aucheri (A. DC.) Victorov -- accepted
  Campanula dubia A. DC. -- not accepted
  Campanula petiolata A. DC. -- accepted
  Campanula rotundifolia var. petiolata (A. DC.) J.K. Henry -- not accepted
  Campanula rotundifolia var. velutina A. DC. -- not accepted
  Campanula saxifraga ssp. aucheri (A. DC.) Ogan. -- not accepted
  Campanula scouleri Hook. ex A. DC. -- accepted -- pale bellflower
  Cananga (DC.) Hook. f. & Thomson -- accepted -- ilang-ilang
  Canavaia ensiformis (L.) DC. -- not accepted
  Canavaia gladiata (Jacq.) DC. -- not accepted
  Canavaia lineata auct. non (Thunb.) DC. -- not accepted
  Canavalia DC. -- accepted -- jackbean
  Canavalia ensiformis (L.) DC. -- accepted -- wonder-bean, wonderbean
  Canavalia gladiata (Jacq.) DC. -- accepted -- sword jackbean
  Canavalia lineata auct. non (Thunb.) DC. -- not accepted
  Canavalia rosea (Sw.) DC. -- accepted -- baybean
  Capparis sandwichiana DC. -- accepted -- native caper, pus pilo
  Caragana grandiflora DC. -- accepted
  Caragana pygmaea (L.) DC. -- accepted
  Cardamine barbareifolia DC. -- not accepted
  Cardamine menziesii DC. -- not accepted
  Cardamine minuta Willd. ex DC. -- not accepted
  Cardamine rhomboidea (Pers.) DC. -- not accepted
  Cardaminopsis kamchatica (Fisch. ex DC.) O.E. Schulz -- not accepted
  Cardionema DC. -- accepted
  Carduus nuttallii (DC.) Pollard -- not accepted
  Carex hostiana DC. -- accepted -- carex de Host, host sedge
  Carica pubescens (A. DC.) Solms -- not accepted -- mountain papaya
  Carissa grandiflora (E. Mey.) A. DC. -- not accepted
  Carissa macrocarpa (Eckl.) A. DC. -- accepted -- amatungulu
  Carminatia Moc. ex DC. -- accepted -- carminatia
  Carminatia tenuiflora DC. -- accepted -- plumeweed
  Carnegiea polylopha (DC.) D.R. Hunt -- not accepted
  Carrichtera DC. -- accepted
  Carrichtera annua (L.) DC. -- accepted
  Cassia aeschinomene DC. ex Collad. -- not accepted
  Cassia artemisioides Gaudich. ex DC. -- not accepted
  Cassia calycioides DC. ex Collad. -- not accepted
  Cassia leschenaultiana DC. -- not accepted
  Cassia leschenaultiana var. aeschinomene (DC. ex Collad.) Benth. -- not accepted
  Cassia patellaria DC. ex Collad. -- not accepted
  Cassia roxburghii DC. -- accepted -- Roxburgh's cassia
  Cassia spectabilis DC. -- not accepted
  Cassia sulfurea DC. ex Collad. -- not accepted
  Cassiope stelleriana (Pall.) DC. -- not accepted
  Castalia pulchella (DC.) Britton -- not accepted
  Castalia reniformis DC. -- not accepted
  Castanopsis chrysophylla (Douglas ex Hook.) A. DC. -- not accepted -- giant chinkapin
  Castanopsis chrysophylla var. minor (Benth.) A. DC. -- not accepted
  Cedrela lilloi C. DC. -- accepted
  Cedrela toona var. australis (Kuntze) C. DC. -- not accepted
  Ceiba caribaea (DC.) A. Chev. -- not accepted
  Centaurea besseriana DC. -- not accepted
  Centaurea biebersteinii DC. -- not accepted -- spotted knapweed
  Centaurea nigra var. radiata DC. -- not accepted
  Centaurea ovina ssp. besseriana (DC.) Dostál -- accepted -- lilac knapweed
  Centaurea transalpina auct. non Schleich. ex DC. -- not accepted -- alpine knapweed
  Centaurea X pouzinii DC. -- accepted
  Centranthus Neck. ex Lam. & DC. -- accepted
  Centranthus ruber (L.) DC. -- accepted -- red valerian
  Centrosema (DC.) Benth. -- accepted -- butterfly pea
  Centrosema virginianum var. ellipticum (DC.) Fernald -- not accepted
  Cephalocereus monoclonos (DC.) Britton & Rose -- not accepted
  Cephalocereus polylophus (DC.) Britton & Rose -- not accepted
  Cerastium biebersteinii DC. -- accepted -- boreal chickweed, snow-in-summer
  Ceratocephala orthoceras DC. -- not accepted
  Cereus extensus Salm-Dyck ex DC. -- not accepted
  Cereus jamacaru DC. -- accepted
  Cereus jamacaru ssp. jamacaru DC. -- accepted
  Cereus pentalophus var. radicans DC. -- not accepted
  Cereus pentalophus var. simplex DC. -- not accepted
  Cereus spinulosus DC. -- not accepted
  Cereus strictus DC. -- not accepted
  Cereus undulosus DC. -- not accepted
  Ceroxylon Bonpl. ex DC. -- accepted -- ceroxylon palm
  Ceroxylon alpinum Bonpl. ex DC. -- accepted -- wax palm
  Chaenactis DC. -- accepted -- chaenactis, pincushion
  Chaenactis glabriuscula DC. -- accepted -- yellow pincushion
  Chaenactis glabriuscula var. glabriuscula DC. -- accepted -- yellow pincushion
  Chaenactis glabriuscula var. lanosa (DC.) H.M. Hall -- accepted -- yellow pincushion
  Chaenactis lanosa DC. -- not accepted
  Chaenactis macrantha D.C. Eaton -- accepted -- bighead dustymaiden, bighead pincushion, large-flower pincushion
  Chaenarrhinum (DC.) Rchb. -- not accepted
  Chaenorhinum (DC.) Rchb. -- accepted -- dwarf snapdragon
  Chaenorrhinum (DC.) Rchb. -- not accepted
  Chaetopappa DC. -- accepted -- least daisy, leastdaisy
  Chaetopappa asteroides Nutt. ex DC. -- accepted -- Arkansas leastdaisy, least daisy
  Chaetopappa asteroides var. asteroides Nutt. ex DC. -- accepted -- Arkansas leastdaisy
  Chamaecrista aeschinomene (DC. ex Collad.) Greene -- not accepted
  Chamaecrista calycioides (DC. ex Collad.) Greene -- accepted -- woodland sensitive pea
  Chamaecrista nictitans ssp. nictitans var. diffusa (DC.) H.S. Irwin & Barneby -- not accepted -- partridge pea
  Chamaecrista nictitans ssp. patellaria (DC. ex Collad.) H.S. Irwin & Barneby -- accepted -- partridge pea, sensitive partridge pea, sensitive plant
  Chamaecrista nictitans ssp. patellaria var. patellaria (DC. ex Collad.) Kartesz & Gandhi -- not accepted -- partridge pea
  Chamaecrista nictitans var. diffusa (DC.) H.S. Irwin & Barneby -- accepted -- partridge pea, sensitive partridge pea, sensitive plant
  Chamaecrista nictitans var. patellaria (DC. ex Collad.) Kartesz & Gandhi -- accepted -- partridge pea, sensitive partridge pea, sensitive plant
  Chamaecrista patellaria (DC. ex Collad.) Greene -- not accepted
  Chamaesenna (DC.) Raf. ex Pittier -- not accepted
  Chamaesyce alsiniflora (Baill.) D.C. Hassall -- not accepted
  Chamaesyce australis (Boiss.) D.C. Hassall -- not accepted
  Chamaesyce biconvexa (Domin) D.C. Hassall -- not accepted
  Chamaesyce canescens ssp. massiliensis (DC.) Soják -- not accepted
  Chamaesyce carissoides (F.M. Bailey) D.C. Hassall ex P.I. Forst. & R.J.F. Hend. -- not accepted
  Chamaesyce coghlanii (F.M. Bailey) D.C. Hassall ex P.I. Forst. & R.J.F. Hend. -- not accepted
  Chamaesyce dallachyana (Baill.) D.C. Hassall -- not accepted
  Chamaesyce filipes (Benth.) D.C. Hassall -- not accepted
  Chamaesyce inappendiculata (Domin) D.C. Hassall -- not accepted
  Chamaesyce macgillivrayi (Boiss.) D.C. Hassall -- not accepted
  Chamaesyce massiliensis (DC.) Galushko -- not accepted
  Chamaesyce micradenia (Boiss.) D.C. Hassall -- not accepted
  Chamaesyce mitchelliana (Boiss.) D.C. Hassall -- not accepted
  Chamaesyce mitchelliana var. hirta (Boiss.) D.C. Hassall -- not accepted
  Chamaesyce myrtoides (Boiss.) D.C. Hassall -- not accepted
  Chamaesyce reconciliationis (Radcl.-Sm.) Soják -- not accepted
  Chamaesyce schultzii (Benth.) D.C. Hassall -- not accepted
  Chamaesyce viridula (Cordem. ex Radcl.-Sm.) Soják -- not accepted
  Chamaesyce vulgaris ssp. massiliensis (DC.) Benedí & Orell -- not accepted
  Chamaesyce wheeleri (Baill.) D.C. Hassall -- not accepted
  Cheilanthes clevelandii D.C. Eaton -- accepted -- Cleveland's lipfern
  Cheilanthes cooperae D.C. Eaton -- accepted -- Cooper's lipfern
  Cheilanthes gracillima D.C. Eaton -- accepted -- lace lipfern
  Cheilanthes lanosa (Michx.) D.C. Eaton -- accepted -- hairy lipfern
  Cheilanthes lemmonii (D.C. Eaton) Domin -- not accepted
  Cheilanthes newberryi (D.C. Eaton) Domin -- accepted -- Newberry's lipfern
  Cheilanthes parryi (D.C. Eaton) Domin -- accepted -- Parry's lip fern, Parry's lipfern
  Chione DC. -- accepted
  Chione DC. -- not accepted
  Chirita acuminata A. DC. -- not accepted
  Chirita edgeworthii DC. -- not accepted
  Chiropetalum astroplethos (J.W. Ingram) Radcl.-Sm. & Govaerts -- accepted -- Mexican silverbush
  Chloris compressa DC. -- not accepted
  Chlorogalum pomeridianum (DC.) Kunth -- accepted -- wavyleaf soap plant
  Chlorogalum pomeridianum var. pomeridianum (DC.) Kunth -- accepted -- wavyleaf soap plant
  Chorispora R. Br. ex DC. -- accepted
  Chorispora tenella (Pall.) DC. -- accepted -- beanpodded mustard, blue mustard, bluemustard, common blue mustard, crossflower, purple mustard, tenella mustard
  Christella boydiae (D.C. Eaton) Holttum -- not accepted
  Chromolaena DC. -- accepted -- thoroughwort
  Chromolaena macrodon (DC.) Nicolson -- accepted
  Chrysobalanus icaco var. pellocarpus (G. Mey.) DC. -- not accepted
  Chrysophyllum africanum A. DC. -- accepted
  Chrysopsis canescens (DC.) Torr. & A. Gray non DC. -- not accepted
  Chrysopsis hispida (Hook.) DC. -- not accepted
  Chrysopsis villosa (Pursh) Nutt. ex DC. -- not accepted
  Chrysopsis villosa var. canescens (DC.) A. Gray -- not accepted
  Chrysopsis villosa var. foliosa (Nutt.) D.C. Eaton -- not accepted
  Chrysosplenium alternifolium var. sibiricum Ser. ex DC. -- not accepted -- Iowa golden saxifrage
  Chrysothamnus viscidiflorus ssp. latifolius (D.C. Eaton) H.M. Hall & Clem. -- not accepted
  Chrysothamnus viscidiflorus ssp. puberulus (D.C. Eaton) H.M. Hall & Clem. -- accepted -- downy rabbitbrush, hairy low rabbitbrush, yellow rabbitbrush
  Chrysothamnus viscidiflorus ssp. viscidiflorus var. latifolius (D.C. Eaton) Greene -- not accepted
  Chrysothamnus viscidiflorus var. latifolius (D.C. Eat.) Greene -- not accepted -- yellow rabbitbrush
  Chrysothamnus viscidiflorus var. latifolius (D.C. Eat.) Greene -- not accepted
  Chrysothamnus viscidiflorus var. puberulus (D.C. Eaton) Jeps. -- not accepted
  Cicuta douglasii (DC.) J.M. Coult. & Rose -- accepted -- Douglas' waterhemlock, water hemlock, western water hemlock
  Cimicifuga cordifolia (DC.) Torr. & A. Gray -- not accepted
  Cimicifuga racemosa var. cordifolia (DC.) A. Gray -- not accepted
  Cimicifuga simplex (DC.) Wormsk. ex Turcz. -- accepted
  Cineraria saxifraga DC. -- accepted -- wild cineraria
  Cirsium bigelovii DC. -- not accepted
  Cirsium douglasii DC. -- accepted -- Douglas' thistle
  Cirsium douglasii var. douglasii DC. -- accepted -- Douglas' thistle
  Cirsium eriocephalum var. leiocephalum D.C. Eaton -- not accepted
  Cirsium foliosum (Hook.) DC. -- accepted -- Drummond's thistle, elk thistle, leafy thistle, meadow thistle
  Cirsium japonicum Fisch. ex DC. -- accepted -- Japanese thistle
  Cirsium kamtschaticum Ledeb. ex DC. -- accepted -- Kamchatka thistle
  Cirsium lanceolatum var. hypoleucum DC. -- not accepted
  Cirsium mexicanum DC. -- accepted -- Mexican thistle
  Cirsium nuttallii DC. -- accepted -- Nuttall's thistle
  Cirsium remotifolium (Hook.) DC. -- accepted -- fewleaf thistle
  Cirsium remotifolium ssp. remotifolium (Hook.) DC. -- not accepted -- fewleaf thistle
  Cirsium remotifolium var. remotifolium (Hook.) DC. -- accepted -- fewleaf thistle, remote-leaved thistle
  Citrus hystrix DC. -- accepted
  Claytonia media (DC.) Link -- not accepted
  Claytonia parvifolia Moc. ex DC. -- not accepted
  Claytonia virginica var. acutiflora DC. -- not accepted -- Virginia springbeauty
  Clematis apiifolia DC. -- accepted
  Clematis caracasana DC. -- not accepted
  Clematis heracleifolia DC. -- accepted -- hyacinth-flower clematis
  Clematis microphylla DC. -- accepted -- headachevine, small-leaf clematis
  Clematis montana Buch.-Ham. ex DC. -- accepted
  Clematis occidentalis (Hornem.) DC. -- accepted -- western blue virginsbower
  Clematis occidentalis var. occidentalis (Hornem.) DC. -- accepted -- western blue virginsbower
  Clematis terniflora DC. -- accepted -- leatherleaf clematis, sweet autumn virginsbower, yam-leaved clematis
  Clematis terniflora var. terniflora DC. -- not accepted -- sweet autumn virginsbower
  Clematis verticillaris DC. -- not accepted
  Cleome diffusa Banks ex DC. -- not accepted -- spreading spiderflower
  Cleome iberica DC. -- not accepted -- Iberian spiderflower
  Cleome multicaulis DC. -- not accepted -- slender spiderflower
  Cleome rutidosperma DC. -- accepted -- consumption weed, fringed spiderflower
  Cleomella DC. -- accepted -- stinkweed
  Cleomella mexicana DC. -- accepted
  Clibadium badieri (DC.) Griseb. -- not accepted
  Clibadium erosum (Sw.) DC. -- accepted -- jackass breadnut
  Clibadium terebinthinaceum var. badieri DC. -- not accepted
  Clibadium vargasii DC. -- not accepted
  Clidemia domingensis (DC.) Cogn. -- accepted -- woodland hogwood
  Clidemia lanata DC. -- not accepted
  Clidemia strigillosa (Sw.) DC. -- accepted -- thicket hogwood
  Cocculus DC. -- accepted -- coralbead
  Cocculus carolinus (L.) DC. -- accepted -- Carolina coralbead, Carolina snailseed, redberry moonseed
  Cocculus diversifolius DC. -- accepted -- snailseed
  Cocculus laurifolius DC. -- accepted -- laurel-leaf snailseed
  Cocculus orbiculatus (L.) DC. -- accepted -- queen coralbead
  Cocculus trilobus (Thunb.) DC. -- not accepted
  Cochlearia officinalis ssp. oblongifolia (DC.) Hultén -- not accepted
  Cochlearia tridactylites Banks ex DC. -- accepted -- cochlearia
  Cochleariopsis groenlandica ssp. oblongifolia (DC.) Á. Löve & D. Löve -- not accepted
  Cochlospermum gossypium (L.) DC. -- not accepted
  Coelopleurum gmelinii (DC.) Ledeb. -- not accepted
  Coelopleurum lucidum ssp. gmelinii (DC.) Á. Löve & D. Löve -- not accepted
  Coldenia canescens DC. -- not accepted
  Columnea angustifolia (DC.) Kuntze -- not accepted
  Columnea anisophylla DC. -- accepted
  Columnea longipes (DC.) Kuntze -- not accepted
  Columnea patrisii (DC.) Kuntze -- not accepted
  Columnea scabrosa Sol. ex DC. -- not accepted
  Comandra pallida A. DC. -- not accepted
  Comandra umbellata ssp. pallida (A. DC.) Piehl -- accepted -- bastard toadflax, common toadflax, pale bastard toadflax, pine bastard toadflax
  Comandra umbellata var. angustifolia (A. DC.) Torr. -- not accepted
  Comandra umbellata var. pallida (A. DC.) M.E. Jones -- not accepted
  Comaropsis pedata (Sm.) DC. -- not accepted
  Conimitella williamsii (D.C. Eaton) Rydb. -- accepted -- Williams' miterwort
  Connarus semidecandrus var. gaudichaudii (DC.) Fosberg -- accepted
  Conocarpus erectus var. sericeus E. Forst. ex DC. -- not accepted
  Conoclinium DC. -- accepted -- thoroughwort
  Conoclinium coelestinum (L) DC -- accepted -- blue mistflower
  Conoclinium colelestinum (L) DC -- not accepted
  Conradia cuneifolia DC. -- not accepted
  Conradia pedunculosa DC. -- not accepted
  Conradia sloanei DC. -- not accepted
  Conradia ventricosa var. angustior DC. -- not accepted
  Consolea rubescens (Salm-Dyck ex DC.) Lem. -- accepted
  Consolida pubescens (DC.) Soó -- accepted -- hairy knight's-spur
  Conyza filaginoides (DC.) Hieron. -- not accepted
  Cordia boissieri A. DC. -- accepted -- anacahuita, anacahuite
  Cordia parvifolia A. DC. -- accepted -- small-leaf geigertree, smallleaf cordia
  Cordia schomburgkii DC. -- accepted
  Cordia sulcata DC. -- accepted -- mucilage manjack
  Coreopsis calliopsidea (DC.) A. Gray -- accepted -- leafstem tickseed
  Coreopsis cardaminefolia (DC.) Torr. & A. Gray -- not accepted
  Coreopsis douglasii (DC.) H.M. Hall -- accepted -- Douglas' tickseed
  Corethrogyne DC. -- accepted -- sandaster
  Corethrogyne californica DC. -- not accepted -- California sandaster
  Corethrogyne californica var. californica DC. -- not accepted -- California sandaster
  Corethrogyne filaginifolia var. californica (DC.) J.P. Saroyan -- not accepted
  Corydalis DC. -- accepted -- fumewort
  Corydalis bulbosa (L.) DC. -- not accepted
  Corydalis flavula (Raf.) DC. -- accepted -- pale corydalis, yellow fumewort
  Corydalis lutea (L.) DC. -- accepted -- rock fumewort
  Corylus californica (A. DC.) Rose -- not accepted
  Corylus cornuta ssp. californica (A. DC.) A.E. Murray -- accepted -- California hazelnut
  Corylus cornuta var. californica (A. DC.) Sharp -- not accepted -- California hazel, California hazelnut
  Corynella DC. -- accepted
  Corynella paucifolia DC. -- not accepted -- retama
  Coryphantha cornifera (DC.) Lem. -- accepted -- Biznaga-partida de cuernos, rhinoceros cactus
  Coryphantha octacantha (DC.) Britton & Rose -- accepted
  Coryphantha radians (DC.) Britton & Rose -- not accepted
  Corytholoma polyanthum (DC.) Fritsch -- not accepted
  Cotula mexicana (DC.) Cabrera -- accepted -- Mexican brassbuttons
  Cotyledon orbiculata var. oblongata (Haw.) DC. -- accepted -- pig's ear
  Coursetia DC. -- accepted -- babybonnets
  Covillea tridentata (DC.) Vail -- not accepted
  Cracca candida (DC.) Kuntze -- not accepted
  Crantzia patrisii (DC.) Fritsch -- not accepted
  Crataegus laevigata (Poir.) DC. -- accepted -- English hawthorn, smooth hawthorn, whitethorn, woodland hawthorn
  Crataegus mexicana DC. -- accepted -- manzanita tejocotera, Mexican hawthorn, tejocote
  Crepis vesicaria ssp. haenseleri (Boiss. ex DC.) P.D. Sell -- not accepted
  Critonia macropoda DC. -- accepted
  Crotalaria berteriana DC. -- not accepted -- Berteron's rattlebox
  Crotalaria berteroana DC. -- accepted -- Berteron's rattlebox
  Crotalaria breviflora DC. -- accepted -- shortflower rattlebox
  Crotalaria falcata Vahl ex DC. -- accepted
  Crotalaria hebecarpa (DC.) Rudd -- accepted
  Crotalaria novae-hollandiae DC. -- accepted -- New Holland rattlepod
  Crotalaria purshii DC. -- accepted -- Pursh's rattlebox
  Crotalaria senegalensis (Pers.) Bacle ex DC. -- accepted
  Crotalaria sphaerocarpa Perr. ex DC. -- accepted
  Crotalaria stipularia var. serpyllifolia DC. -- not accepted
  Crotalaria striata DC. -- not accepted
  Croton aceroides Radcl.-Sm. -- accepted
  Croton agrestis (Pax & K. Hoffm.) Radcl.-Sm. & Govaerts -- accepted
  Croton ambovombensis Radcl.-Sm. & Govaerts -- accepted
  Croton apostolon Radcl.-Sm. & Govaerts -- accepted
  Croton argentealbidus Radcl.-Sm. & Govaerts -- accepted
  Croton cinerascens Radcl.-Sm. & Govaerts -- accepted
  Croton cnidophyllus Radcl.-Sm. & Govaerts -- accepted
  Croton cnidophyllus var. dui (Y.T. Chang) Radcl.-Sm. & Govaerts -- not accepted
  Croton coccymelophyllus Radcl.-Sm. & Govaerts -- accepted
  Croton cooperianus (Croizat) Radcl.-Sm. & Govaerts -- accepted
  Croton corymbulosoides Radcl.-Sm. & Govaerts -- not accepted
  Croton dictyophlebodes Radcl.-Sm. -- accepted
  Croton glomeratus Aug. DC. -- accepted
  Croton grandifructus Radcl.-Sm. & Govaerts -- accepted
  Croton guildingioides Radcl.-Sm. & Govaerts -- not accepted
  Croton herzogianus (Pax & K. Hoffm.) Radcl.-Sm. & Govaerts -- accepted
  Croton heteranthus Aug. DC. -- accepted
  Croton holodiscus (Croizat) Radcl.-Sm. & Govaerts -- accepted
  Croton inhambanensis Radcl.-Sm. -- accepted
  Croton integer (Chodat) Radcl.-Sm. & Govaerts -- accepted
  Croton iteophyllus Radcl.-Sm. & Govaerts -- accepted
  Croton janeirensis Radcl.-Sm. & Govaerts -- accepted
  Croton kilwae Radcl.-Sm. -- accepted
  Croton lauioides Radcl.-Sm. & Govaerts -- accepted
  Croton lepidotus Aug. DC. -- accepted
  Croton lepidus (S. Moore) Radcl.-Sm. & Govaerts -- accepted
  Croton leuconeurus ssp. mossambicensis Radcl.-Sm. -- accepted
  Croton lissophyllus Radcl.-Sm. & Govaerts ex Esser -- accepted
  Croton lithrifolius (Croizat) Radcl.-Sm. & Govaerts -- accepted
  Croton longipedicellatus ssp. austrotanzanicus Radcl.-Sm. -- accepted
  Croton longipedicellatus var. brevipedicellatus Radcl.-Sm. -- accepted
  Croton longipedicellatus var. glabrescens Radcl.-Sm. -- accepted
  Croton macrolepis Radcl.-Sm. & Govaerts -- accepted
  Croton malvoides (Croizat) Radcl.-Sm. & Govaerts -- accepted
  Croton microphyllinus Radcl.-Sm. & Govaerts -- accepted
  Croton mocinoi Radcl.-Sm. & Govaerts -- not accepted
  Croton mocquerysii Aug. DC. -- accepted
  Croton nicaraguensis Radcl.-Sm. & Govaerts -- not accepted
  Croton nigricans (Mart. ex Schltdl.) Radcl.-Sm. & Govaerts -- accepted
  Croton pachyclados Radcl.-Sm. -- not accepted
  Croton pavonianus Radcl.-Sm. & Govaerts -- not accepted
  Croton polytrichus ssp. brachystachyus Radcl.-Sm. -- accepted
  Croton pyrosoma (Croizat) Radcl.-Sm. & Govaerts -- accepted
  Croton robustior (L.B. Sm. & Downs) Radcl.-Sm. & Govaerts -- accepted
  Croton serratoideus Radcl.-Sm. & Govaerts -- accepted
  Croton socotranus var. pachyclados (Radcl.-Sm.) Radcl.-Sm. -- accepted
  Croton spissirameus Radcl.-Sm. & Govaerts -- accepted
  Croton talaeporos Radcl.-Sm. -- accepted
  Croton thellungianus (Herter ex Arechav.) Radcl.-Sm. & Govaerts -- accepted
  Croton tocantinsensis Radcl.-Sm. & Govaerts -- accepted
  Croton trichophilus (Pax & K. Hoffm.) Radcl.-Sm. & Govaerts -- accepted
  Croton venezuelensis Radcl.-Sm. & Govaerts -- not accepted
  Croton verrucosus Radcl.-Sm. & Govaerts -- not accepted
  Croton vietnamensis Radcl.-Sm. & Govaerts -- accepted
  Croton villosissimus (Chodat & Hassl.) Radcl.-Sm. & Govaerts -- accepted
  Croton viridulus (Croizat) Radcl.-Sm. & Govaerts -- accepted
  Crupina (Pers.) DC. -- accepted -- crupina
  Crusea subulata (DC.) A. Gray -- not accepted
  Cryptantha texana (A. DC.) Greene -- accepted -- pick me nots
  Cryptotaenia DC. -- accepted -- honewort
  Cryptotaenia canadensis (L.) DC. -- accepted -- Canadian honewort, honewort
  Cuphea ignea A. DC. -- accepted -- cigar flower
  Curio talinoides (DC.) P.V. Heath -- accepted
  Cusparia febrifuga Humb. ex DC. -- not accepted -- cusparia
  Cyamopsis DC. -- accepted
  Cyamopsis psoralioides DC. -- not accepted
  Cyamopsis psoraloides DC. -- not accepted
  Cyathea balanocarpa D.C. Eaton -- accepted
  Cyathea insignis D.C. Eaton -- accepted
  Cyathea minor D.C. Eaton -- accepted
  Cyclosorus boydiae (D.C. Eaton) W.H. Wagner -- accepted
  Cyclosorus boydiae var. boydiae (D.C. Eaton) W.H. Wagner -- not accepted
  Cylindropuntia kleiniae (DC.) F.M. Knuth -- accepted
  Cylindropuntia leptocaulis (DC.) F.M. Knuth -- accepted -- Christmas cactus, tasajillo, tesajo cactus
  Cylindropuntia rosea (DC.) Backeb. -- accepted
  Cymbopogon citratus (DC.) Stapf -- accepted -- lemon grass
  Cymbopogon nardus subvar. citratus (DC.) Roberty -- not accepted
  Cymopterus glomeratus (Nutt.) DC. -- accepted -- plains springparsley
  Cynophalla (DC.) J. Presl -- accepted -- caper-tree
  Cynosciadium DC. -- accepted
  Cynosciadium digidatum DC. -- not accepted
  Cynosciadium digitatum DC. -- accepted -- finger dogshade, fringed dogshade
  Cynosciadium pinnatum DC. -- not accepted
  Cynosurus tenellus Cav. ex DC. -- not accepted
  Cynthia dandelion (L) DC -- not accepted
  Cyrtandra dispar DC. -- accepted
  Dalbergia sissoo Roxb. ex DC. -- accepted -- Indian rosewood
  Dalea carthagenensis ssp. domingensis (DC.) R.T. Clausen -- not accepted
  Dalea carthaginensis var. domingensis (DC.) -- not accepted
  Danthonia DC. -- accepted -- danthonia, oatgrass
  Danthonia decumbens (L.) DC. -- accepted -- common heathgrass
  Datura meteloides auct. non DC. ex Dunal. -- not accepted
  Datura meteloides DC. ex Dunal -- not accepted
  Daubentonia punicea (Cav.) DC. -- not accepted
  Deinandra corymbosa (DC.) B.G. Baldw. -- accepted -- coastal moonshine, coastal tarweed
  Deinandra corymbosa ssp. corymbosa (DC.) B.G. Baldw. -- not accepted
  Deinandra fasciculata (DC.) Greene -- accepted -- clustered tarweed
  Delphinium laxiflorum DC. -- accepted
  Delphinium menziesii DC. -- accepted -- Menzies' larkspur
  Delphinium menziesii ssp. menziesii DC. -- accepted -- Menzies' larkspur
  Dendranthema (DC.) Des Moul. -- accepted -- arctic daisy
  Dendrocereus undulosus (DC.) Britton & Rose -- accepted
  Descurainia menziesii (DC.) O.E. Schulz -- not accepted
  Descurainia pinnata ssp. menziesii (DC.) Detling -- not accepted -- Menzies' tansymustard
  Desmochaeta prostrata (L.) DC. -- not accepted
  Desmodium acuminatum (Michx.) DC. -- not accepted
  Desmodium adscendens (Sw.) DC. -- accepted -- zarzabacoa galana
  Desmodium angustifolium (Kunth) DC. -- accepted -- narrowleaf ticktrefoil
  Desmodium aparines (Link) DC. -- accepted
  Desmodium axillare (Sw.) DC. -- accepted -- zarzabacoa de monte
  Desmodium axillare var. axillare (Sw.) DC. -- accepted -- zarzabacoa de monte
  Desmodium bracteosum (Michx.) DC. -- not accepted
  Desmodium cajanifolium (Kunth) DC. -- accepted -- tropical ticktrefoil
  Desmodium canadense (L.) DC. -- accepted -- Canada tickclover, showy tick-trefoil, showy ticktrefoil
  Desmodium canescens (L.) DC. -- accepted -- hoary tickclover, hoary ticktrefoil
  Desmodium capitatum (Burm. f.) DC. -- not accepted
  Desmodium ciliare (Muhl. ex Willd.) DC. -- accepted -- hairy small-leaf ticktrefoil, littleleaf tickclover
  Desmodium ciliare var. ciliare (Muhl. ex Willd.) DC. -- accepted -- hairy small-leaf ticktrefoil, hairy smallleaf ticktrefoil
  Desmodium cinereum (Kunth) DC. -- accepted
  Desmodium elegans DC. -- accepted
  Desmodium gangeticum (L.) DC. -- accepted
  Desmodium glabellum (Michx.) DC. -- accepted -- Dillenius' ticktrefoil
  Desmodium glabrum (Mill.) DC. -- accepted -- zarzabacoa dulce
  Desmodium grandiflorum DC. -- not accepted
  Desmodium gyroides (Roxb. ex Link) DC. -- not accepted
  Desmodium heterocarpon (L.) DC. -- accepted -- Asian ticktrefoil
  Desmodium heterocarpon var. heterocarpon (L.) DC. -- accepted -- carpon desmodium
  Desmodium heterophyllum (Willd.) DC. -- accepted -- Spanish clover, variable-leaf ticktrefoil
  Desmodium incanum DC. -- accepted -- tickclover, zarzabacoa comun
  Desmodium incanum var. incanum DC. -- not accepted -- zarzabacoa comun
  Desmodium laevigatum (Nutt.) DC. -- accepted -- smooth tickclover, smooth ticktrefoil
  Desmodium lineatum DC. -- accepted -- sand ticktrefoil
  Desmodium marilandicum (L.) DC. -- accepted -- Maryland tickclover, smooth small-leaf ticktrefoil
  Desmodium molle (Vahl) DC. -- not accepted
  Desmodium nudiflorum (L.) DC. -- accepted -- bare-stemmed tick-treefoil, barestem tickclover, nakedflower ticktrefoil
  Desmodium obtusum (Muhl. ex Willd.) DC. -- accepted -- stiff tickclover, stiff ticktrefoil
  Desmodium paniculatum (L.) DC. -- accepted -- narrow-leaf tick-trefoil, panicled tickclover, panicledleaf ticktrefoil
  Desmodium paniculatum var. paniculatum (L.) DC. -- accepted -- panicledleaf ticktrefoil
  Desmodium pauciflorum (Nutt.) DC. -- accepted -- fewflower ticktrefoil, fewflowered tickclover
  Desmodium polycarpon (Poir.) DC. -- not accepted
  Desmodium rhombifolium auct. non (Elliott) DC. -- not accepted
  Desmodium rigidum (Elliott) DC. -- not accepted
  Desmodium rotundifloium DC. -- not accepted
  Desmodium rotundifolium DC. -- accepted -- prostrate ticktrefoil, roundhead tickclover
  Desmodium salicifolium (Poir.) DC. -- accepted
  Desmodium spirale (Sw.) DC. -- not accepted
  Desmodium strictum (Pursh) DC. -- accepted -- pine barren ticktrefoil, pinebarren ticktrefoil
  Desmodium supinum DC. -- not accepted
  Desmodium tortuosum (Sw.) DC. -- accepted -- Dixie tick trefoil, Dixie ticktrefoil
  Desmodium triflorum (L.) DC. -- accepted -- threeflower ticktrefoil
  Desmodium umbellatum (L.) DC. -- not accepted
  Desmodium uncinatum auct. non (Jacq.) DC. -- not accepted
  Desmodium viridiflorum (L.) DC. -- accepted -- velvetleaf tickclover, velvetleaf ticktrefoil
  Dianella ensifolia (L.) DC. -- accepted -- cerulean flaxlily
  Diaperia multicaulis (DC.) Nutt. -- not accepted
  Diaperia prolifera (Nutt. ex DC.) Nutt. -- accepted -- big-head rabbit-tobacco, bighead pygmycudweed
  Diaperia prolifera var. prolifera (Nutt. ex DC.) Nutt. -- accepted -- big-head rabbit-tobacco, bighead pygmycudweed
  Diastema comiferum (DC.) Benth. ex Walp. -- accepted
  Diastema erinoides (DC.) Benth. ex Walp. -- not accepted
  Diastema hispidum (DC.) Fritsch -- accepted
  Dichanthium saccharoides subvar. laguroides (DC.) Roberty -- not accepted
  Dichrostachys (DC.) Wight & Arn. -- accepted
  Didiplis diandra (Nutt. ex DC.) Alph. Wood -- accepted -- waterpurslane
  Didymocarpus angovensis Boj. ex DC. -- not accepted
  Didymocarpus corchorifolius A. DC. -- accepted
  Didymocarpus cordatus A. DC. -- accepted
  Didymocarpus cordatus var. cordatus A. DC. -- accepted
  Didymocarpus lanuginosus Wall. ex DC. -- not accepted
  Didymocarpus mollis Wall. ex A. DC. -- accepted
  Diellia mannii (D.C. Eaton) W.J. Rob. -- not accepted -- Mann's island spleenwort
  Digitaria velutina (DC.) Hitchc. -- not accepted
  Dimorphotheca aurantiaca DC. non Horton -- not accepted
  Dimorphotheca ecklonis DC. -- not accepted
  Dimorphotheca sinuata DC. -- accepted -- glandular Cape marigold
  Dioon strobilaceum Lem. ex A.DC -- not accepted
  Diospyros blancoi A. DC. -- accepted -- mabolo
  Diospyros ferrea ssp. sandwicensis (A. DC.) Fosberg -- not accepted
  Diospyros ferrea var. sandwicensis (A. DC.) Bakh. -- not accepted
  Diospyros laevis Bojer ex DC. -- not accepted
  Diospyros madagascariensis (A. DC.) -- not accepted
  Diospyros mangabensis Aug. DC. -- accepted
  Diospyros mespiliformis Hochst. ex A. DC. -- accepted -- ebony diospyros
  Diospyros neraudii A. DC. -- accepted
  Diospyros nigricans Wall. ex A. DC. -- not accepted
  Diospyros sandwicensis (A. DC.) Fosberg -- accepted -- lama
  Diospyros squamosa Bojer ex DC. -- accepted
  Dipholis A. DC. -- not accepted -- bustic
  Dipholis salicifolia (L.) A. DC. -- not accepted -- willow bustic
  Diplochita serrulata DC. -- not accepted
  Diplopappus lutescens Lindl. ex DC. -- not accepted
  Diplotaxis DC. -- accepted -- wallrocket
  Diplotaxis erucoides (L.) DC. -- accepted -- white wallrocket
  Diplotaxis muralis (L.) DC. -- accepted -- annual wallrocket
  Diplotaxis tenuifolia (L.) DC. -- accepted -- perennial wallrocket
  Dipogon lignosus (L.) Verdc. -- accepted -- Okie bean
  Dircaea vauthieri (DC.) Decne. -- not accepted
  Discocalyx (A. DC.) Mez -- accepted
  Discopleura nuttallii DC. -- not accepted
  Disocactus phyllanthoides (DC.) Barthlott -- accepted
  Distictis buccinatoria (DC.) A.H. Gentry -- accepted -- blood-trumpet
  Distictis lactiflora (Vahl) DC. -- accepted -- liana fragante
  Ditaxis argothamnoides (Bertero ex Spreng.) Radcl.-Sm. & Govaerts -- accepted -- Blodgett's silverbush
  Ditaxis simulans (J.W. Ingram) Radcl.-Sm. & Govaerts -- accepted -- plateau silverbush
  Dodonaea jamaicensis DC. -- not accepted
  Dodonaea viscosa ssp. angustissima (DC.) J.G. West -- accepted -- narrow-leaf hopbush
  Dolichos jacquinii DC. -- not accepted
  Dolichos sericeus ssp. formosus (Hochst. ex A. Rich.) Verdc. -- accepted
  Dolichothele longimamma (DC.) Britton & Rose -- not accepted
  Downingia elegans var. corymbosa (A. DC.) A. Gray -- not accepted
  Draba borealis DC. -- accepted -- boreal draba
  Draba borealis var. borealis DC. -- not accepted -- boreal whitlowgrass
  Draba corymbosa R. Br. ex DC. -- accepted -- flat-top draba, flat-top whitlowgrass
  Draba daurica DC. -- not accepted -- scree whitlowgrass
  Draba grandis Langsd. ex DC. -- accepted -- North Pacific draba
  Draba oblongata R. Br. ex DC. -- accepted -- Canadian arctic draba
  Draba pilosa Adams ex DC. -- accepted
  Drymonia antirrhina (DC.) Seem. -- not accepted
  Drymonia glabra (DC.) C.V. Morton -- not accepted
  Dryopteris clintoniana (D.C. Eaton) Dowell -- accepted -- Clinton's woodfern, dryoptčre de Clinton
  Dryopteris cristata var. clintoniana (D.C. Eaton) Underw. -- not accepted
  Dryopteris erythrosora (D.C. Eaton) Kuntze -- accepted
  Drypetes ilicifolia (DC.) Krug & Urb. -- accepted -- rosewood
  Dubautia ciliolata (DC.) D.D. Keck -- accepted -- lava dubautia
  Dubautia ciliolata ssp. ciliolata (DC.) D.D. Keck -- accepted -- lava dubautia
  Dubautia scabra (DC.) D.D. Keck -- accepted -- rough dubautia
  Dubautia scabra ssp. scabra (DC.) D.D. Keck -- accepted -- rough dubautia
  Dyssodia acerosa DC. -- not accepted
  Dyssodia belenidium (DC.) Macloskie -- not accepted
  Dyssodia micropoides (DC.) Loes. -- not accepted
  Dyssodia pentachaeta (DC.) B.L. Rob. -- not accepted
  Dyssodia pentachaeta var. belenidium (DC.) Strother -- not accepted
  Dyssodia tenuiloba (DC.) B.L. Rob. -- not accepted
  Eatonella nivea (D.C. Eaton) A. Gray -- accepted -- white eatonella, white false tickhead
  Echeveria DC. -- accepted
  Echinacea angustifolia DC. -- accepted -- blacksamson, blacksamson echinacea
  Echinacea angustifolia var. angustifolia DC. -- not accepted -- blacksamson, blacksamson echinacea
  Echinacea pallida var. angustifolia (DC.) Cronquist -- not accepted
  Echinocactus conoideus (DC.) Poselg. -- not accepted
  Echinocereus cinerascens (DC.) H.P. Kelsey & Dayton -- accepted
  Echinocereus cinerascens ssp. cinerascens (DC.) H.P. Kelsey & Dayton -- accepted
  Echinocereus pentalophus (DC.) Lem. -- accepted -- ladyfinger cactus, Órgano-pequeńo alicoche falso
  Echinocereus pentalophus ssp. pentalophus (DC.) Lem. -- accepted
  Echinofossulocactus crispatus (DC.) Lawr. -- not accepted
  Echinofossulocactus obvallatus (DC.) Lawr. -- not accepted
  Ehretia elliptica DC. -- not accepted
  Elaeodendron xylocarpum (Vent.) DC. -- accepted
  Elymus repens var. aristatus (Schreb. ex Baumg.) Melderis & D.C. McClint. -- not accepted
  Elytrigia obtusiflora (DC.) Tzvelev -- accepted
  Emilia sonchifolia (L) DC -- accepted -- lilac tasselflower
  Emilia sonchifolia var. sonchifolia (L) DC -- not accepted -- lilac tasselflower
  Empetrum nigrum var. purpureum (Raf.) A. DC. -- not accepted
  Enceliopsis argophylla (D.C. Eaton) A. Nelson -- accepted -- silver-leaf sunray, silverleaf sunray
  Entada polystachya (L.) DC. -- accepted -- callingcard vine
  Entada pursaetha DC. -- not accepted
  Entandrophragma C. DC. -- accepted
  Enydra sessilis (Sw.) DC. -- accepted -- smallray swampwort
  Epiphyllum oxypetalum (DC.) Haw. -- accepted -- Dutchman's pipe cactus, Nopalillo criollo
  Episcia guadalupensis (DC.) Hanst. -- not accepted
  Episcia hispida DC. -- not accepted
  Episcia melittifolia f. guadalupensis (DC.) Stehlé -- not accepted
  Episcia melittifolia var. guadelupensis (DC.) Urb. -- not accepted
  Epithema horsfieldii (R. Brown) DC. -- accepted
  Epithema horsfieldii var. horsfieldii (R. Brown) DC. -- accepted
  Erato DC. -- not accepted
  Erato DC. -- accepted
  Erato polymnioides DC. -- accepted
  Erato polymnionides DC. -- not accepted
  Erechtites arguta (A. Rich.) DC. -- not accepted
  Erechtites glomerata (Desf. ex Poir.) DC. -- not accepted -- Australian fireweed, cutleaf burnweed
  Erechtites hieracifolia (L.) Raf. ex DC. -- not accepted -- burnweed
  Erechtites hieraciifolia (L.) Raf. ex DC. -- not accepted -- American burnweed
  Erechtites hieraciifolia var. hieraciifolia (L.) Raf. ex DC. -- not accepted -- American burnweed
  Erechtites hieraciifolius (L.) Raf. ex DC. -- accepted -- American burnweed, burnweed
  Erechtites hieraciifolius var. hieraciifolius (L.) Raf. ex DC. -- accepted -- American burnweed
  Erechtites minima (Poir.) DC. -- not accepted -- Australian fireweed, coastal burnweed
  Erechtites minimus (Poir.) DC. -- accepted -- coastal burnweed
  Erechtites prenanthoides (A. Rich.) DC. -- not accepted
  Erechtites valerianifolia (Link ex Spreng.) DC. -- accepted -- tropical burnweed
  Ericameria linearifolia (DC.) Urbatsch & Wussow -- accepted -- narrowleaf goldenbush, slimleaf goldenbush
  Ericameria viscidiflora ssp. puberula (D.C. Eaton) L.C. Anderson -- not accepted
  Ericameria viscidiflora var. latifolia (D.C. Eaton) L.C. Anderson -- not accepted
  Erigeron acris ssp. kamtschaticus (DC.) H. Hara -- not accepted -- bitter fleabane
  Erigeron acris var. asteroides (Andrz. ex Besser) DC. -- not accepted
  Erigeron acris var. kamtschaticus (DC.) Herder -- accepted -- bitter daisy, bitter fleabane, blue fleabane
  Erigeron arenarioides (D.C. Eaton ex A. Gray) A. Gray ex Rydb. -- accepted -- sand fleabane
  Erigeron asperugineus (D.C. Eaton) A. Gray -- accepted -- Idaho daisy, Idaho fleabane
  Erigeron bellioides DC. -- accepted -- bellorita
  Erigeron concinnus var. condensatus D.C. Eaton -- accepted -- Navajo daisy, Navajo fleabane
  Erigeron condensatus (D.C. Eaton) Greene -- not accepted
  Erigeron cuneifolius DC. -- accepted -- wedgeleaf fleabane
  Erigeron kamtschaticus DC. -- not accepted
  Erigeron karvinskianus DC. -- accepted -- Latin American fleabane
  Erigeron multiradiatus (Lindl. ex DC.) Benth. ex C.B. Clarke -- accepted -- Himalayan fleabane
  Erigeron pumilus var. condensatus (D.C. Eaton) Cronquist -- not accepted
  Erigeron roylei DC. -- accepted
  Erigeron speciosus (Lindl.) DC. -- accepted -- aspen fleabane, Oregon daisy, Oregon fleabane, threenerve fleabane
  Erigeron speciosus var. speciosus (Lindl.) DC. -- not accepted -- aspen daisy, aspen fleabane
  Erigeron tenellus DC. -- accepted -- Rio Grande fleabane
  Erigeron unalaschkensis (DC.) Vierh. -- not accepted
  Erigeron uniflorus var. unalaschkensis (DC.) Ostenf. -- not accepted
  Erigeron ursinus D.C. Eaton -- accepted -- bear daisy, Bear River fleabane
  Eriodendron anfractuosum DC. -- not accepted
  Eriophyllum confertiflorum (DC.) A. Gray -- accepted -- golden-yarrow, yellow-yarrow
  Eriophyllum confertiflorum var. confertiflorum (DC.) A. Gray -- accepted -- golden-yarrow
  Eriophyllum lanatum var. achillaeoides (DC.) Jeps. -- not accepted -- common woolly sunflower
  Eriophyllum lanatum var. achillioides (DC.) Jeps. -- accepted -- common woolly sunflower
  Eriophyllum lanatum var. leucophyllum (DC.) W.R. Carter -- accepted -- common woolly sunflower
  Eriophyllum multicaule (DC.) A. Gray -- accepted -- many-stem woolly-sunflower, manystem woolly sunflower
  Eriosema (DC.) Desv. -- accepted -- sand pea
  Eritrichium aretioides (Cham.) A. DC. -- not accepted
  Eritrichium chamissonis DC. -- not accepted
  Eritrichium nanum var. chamissonis (DC.) Herder -- accepted -- arctic alpine forget-me-not
  Eritrichium pauciflorum (Ledeb.) DC. -- accepted
  Eryngium prostratum Nutt. ex DC. -- accepted -- creeping eryngo
  Erysimum asperum (Nutt.) DC. -- accepted -- western wallflower
  Erythrina abyssinica Lam. ex DC. -- accepted
  Erythroxylum brevipes DC. -- accepted -- brisselet
  Eschweilera Mart. ex DC. -- accepted
  Eschweillera Mart. ex DC. -- not accepted
  Eucalyptus cneorifolia DC. -- accepted
  Eucalyptus gomphocephala DC. -- accepted -- tuart
  Eucalyptus oblonga DC. -- accepted
  Eucalyptus obtusiflora DC. -- accepted
  Eucalyptus punctata DC. -- accepted -- gray gum
  Eucalyptus radiata Sieber ex DC. -- accepted -- narrow-leaf peppermint gum
  Eucalyptus stellulata Sieber ex DC. -- accepted
  Eucephalus engelmannii (D.C. Eaton) Greene -- accepted -- Engelmann's aster
  Euchiton gymnocephalus (DC.) Anderb. -- accepted -- creeping cudweed
  Eucodonia andrieuxii (DC.) Wiehler -- accepted
  Eugenia aeruginea sensu Griseb., non DC. -- not accepted
  Eugenia apiculata DC. -- accepted -- shortleaf stopper
  Eugenia biflora (L.) DC. -- accepted -- blackrodwood
  Eugenia bilflora (L.) DC. -- not accepted
  Eugenia cauliflora DC. -- not accepted
  Eugenia confusa DC. -- accepted -- redberry stopper
  Eugenia cordata (Sw.) DC. -- accepted -- lathberry
  Eugenia cordata var. cordata (Sw.) DC. -- accepted -- lathberry
  Eugenia glabrata (Sw.) DC. -- accepted -- smooth rodwood
  Eugenia monticola (Sw.) DC. -- accepted -- birdcherry
  Eugenia reinwardtiana (Blume) DC. -- accepted -- mountain stopper
  Eulophus americanus Nutt. ex DC. -- not accepted
  Eupatorium album var. glandulosum (Michx.) DC. -- not accepted -- white thoroughwort
  Eupatorium azureum DC. -- not accepted -- blue boneset
  Eupatorium capillifolium var. leptophyllum (DC.) H.E. Ahles -- not accepted
  Eupatorium cuneifolium var. semiserratum (DC.) Fernald & Grisc. -- not accepted
  Eupatorium leptophyllum DC. -- accepted -- false fennel
  Eupatorium leucolepis (DC.) Torr. & A. Gray -- accepted -- justiceweed
  Eupatorium leucolepis var. leucolepis (DC.) Torr. & A. Gray -- accepted -- justiceweed
  Eupatorium macrodon DC. -- not accepted
  Eupatorium resinosum Torr. ex DC. -- accepted -- pine barren thoroughwort
  Eupatorium semiserratum DC. -- accepted -- smallflower eupatorium, smallflower thoroughwort
  Euphorbia abdita (D.G. Burch) Radcl.-Sm. -- accepted
  Euphorbia affinis DC. -- not accepted
  Euphorbia amygdaloides ssp. semiperfoliata (Viv.) Radcl.-Sm. -- not accepted
  Euphorbia amygdaloides var. robbiae (Turrill) Radcl.-Sm. -- not accepted
  Euphorbia artaudiana DC. -- not accepted
  Euphorbia bejariensis DC. -- not accepted
  Euphorbia brittingeri ssp. flavicoma (DC.) Ladero -- not accepted
  Euphorbia buxoides Radcl.-Sm. -- accepted
  Euphorbia carniolica DC. -- not accepted
  Euphorbia chamaesyce var. massiliensis (DC.) Thell. -- not accepted
  Euphorbia characias ssp. wulfenii (Hoppe ex W. Koch) Radcl.-Sm. -- accepted
  Euphorbia coderiana DC. -- not accepted
  Euphorbia commelinii DC. -- not accepted
  Euphorbia cornastra (Dressler) Radcl.-Sm. -- accepted
  Euphorbia cyparissias var. esuloides DC. -- not accepted
  Euphorbia esuloides (DC.) Ten. -- not accepted
  Euphorbia flavicoma DC. -- accepted
  Euphorbia flavicoma ssp. flavicoma DC. -- accepted
  Euphorbia hajhirensis Radcl.-Sm. -- accepted
  Euphorbia hormorrhiza Radcl.-Sm. -- accepted
  Euphorbia inornata (Dressler) Radcl.-Sm. -- not accepted
  Euphorbia jasiewiczii (Chrtek & Krísa) Radcl.-Sm. -- not accepted
  Euphorbia lancasteriana Radcl.-Sm. -- not accepted
  Euphorbia leonardii (D.G. Burch) Radcl.-Sm. -- accepted
  Euphorbia longibracteata DC. -- not accepted
  Euphorbia massiliensis DC. -- not accepted
  Euphorbia nicaeensis var. lasiocarpa (Boiss.) Radcl.-Sm. & Govaerts -- accepted
  Euphorbia occidentaustralica Radcl.-Sm. & Govaerts -- accepted
  Euphorbia parvicaruncula D.C. Hassall -- accepted
  Euphorbia peplus var. minima DC. -- accepted
  Euphorbia petiolata var. postii (Boiss.) Radcl.-Sm. -- accepted
  Euphorbia pithyusa ssp. cupanii (Guss. ex Bertol.) Radcl.-Sm. -- accepted
  Euphorbia planiticola D.C. Hassall -- accepted
  Euphorbia plumerioides var. macrocarpa Radcl.-Sm. -- not accepted
  Euphorbia plumerioides var. microphylla Radcl.-Sm. -- not accepted
  Euphorbia procumbens DC. -- not accepted
  Euphorbia pseudosikkimensis (Hurus. & Yu. Tanaka) Radcl.-Sm. -- accepted
  Euphorbia pulchella Brouss. ex DC. -- not accepted
  Euphorbia pyrifolia var. coriacea Radcl.-Sm. -- accepted
  Euphorbia reconciliationis Radcl.-Sm. -- accepted
  Euphorbia rhabdotosperma Radcl.-Sm. -- accepted
  Euphorbia salsuginosa (McVaugh) Radcl.-Sm. & Govaerts -- not accepted
  Euphorbia saxicola Radcl.-Sm. -- accepted
  Euphorbia schillingii Radcl.-Sm. -- accepted
  Euphorbia schillingii var. praecox A.D. Schill. ex Radcl.-Sm. -- not accepted
  Euphorbia schumannii Radcl.-Sm. -- accepted
  Euphorbia segetalis var. longibracteata (DC.) Boiss. -- not accepted
  Euphorbia talaina Radcl.-Sm. -- accepted
  Euphorbia tannensis ssp. eremophila (A. Cunn. ex Hook.) D.C. Hassall -- accepted
  Euphorbia tannensis var. eremophila (A. Cunn. ex Hook.) D.C. Hassall -- not accepted
  Euphorbia tannensis var. finlaysonii (J.M. Black) D.C. Hassall -- not accepted
  Euphorbia tchen-ngoi (Soják) Radcl.-Sm. -- not accepted
  Euphorbia torrida DC. -- not accepted
  Euphorbia tumistyla (D.G. Burch) Radcl.-Sm. -- accepted
  Euphorbia uncinata DC. -- not accepted
  Euphorbia viridula Cordem. ex Radcl.-Sm. -- accepted
  Euphorbia waldsteinii (Soják) Radcl.-Sm. -- not accepted
  Euphorbia X cornubiensis Radcl.-Sm. -- not accepted
  Euphorbia X malahidensis Radcl.-Sm. -- not accepted
  Euphorbia yunnanensis Radcl.-Sm. -- not accepted
  Euphrosyne DC. -- accepted
  Euphrosyne parthenifolia DC. -- not accepted
  Euphrosyne partheniifolia DC. -- accepted
  Euryops chrysanthemoides (DC.) B. Nord. -- accepted -- bull's eye
  Euryops multifidus (Thunb.) DC. -- accepted -- euryops, hawk's eye
  Evax multicaulis DC. -- not accepted
  Evax prolifera Nutt. ex DC. -- not accepted -- bighead pygmycudweed, rabbit tobacco, rabbit's tobacco
  Exocarpos gaudichaudii A. DC. -- accepted -- hulumoa
  Feea osmundoides (DC. ex Poir.) Copel. -- not accepted
  Fernaldia pandurata (A. DC.) Woodson -- accepted -- loroco
  Ferocactus echidne (DC.) Britton & Rose -- accepted
  Ferocactus glaucescens (DC.) Britton & Rose -- accepted
  Ferocactus histrix (DC.) G.E. Linds. -- accepted
  Festuca caerulea (L.) Lam. ex DC. -- not accepted
  Festuca ciliata Danthoine ex Lam. & DC. -- not accepted
  Festuca inermis (Leyss.) DC. & Lam. -- not accepted
  Festuca inermis var. inermis (Leyss.) DC. & Lam. -- not accepted
  Filaginopsis multicaulis (DC.) Torr. & A. Gray -- not accepted
  Filago prolifera (Nutt. ex DC.) Britton non Pomel -- not accepted
  Fissidens julianus (Savi ex DC.) Schimp. -- not accepted
  Flaveria oppositifolia auct. non (DC.) Rydb. -- not accepted
  Florestina tripteris DC. -- accepted -- sticky florestina
  Flourensia DC. -- accepted -- tarwort
  Flourensia cernua DC. -- accepted -- American tarwort, tarbush
  Folioceros D.C. Bharadwaj -- accepted
  Folioceros assamicus D.C. Bharadwaj -- accepted
  Folioceros dixitianus (Mahab.) D.C. Bharadwaj -- accepted
  Folioceros fuciformis (Mont.) D.C. Bharadwaj -- accepted
  Folioceros glandulosus (Lehm. & Lindenb.) D.C. Bharadwaj -- accepted
  Folioceros incurvus (Steph.) D.C. Bharadwaj -- accepted
  Folioceros indicus D.C. Bharadwaj -- accepted
  Folioceros mangaloreus (Steph.) D.C. Bharadwaj -- accepted
  Folioceros physocladus D.C. Bharadwaj -- accepted
  Folioceros pinnilobus (Steph.) D.C. Bharadwaj -- accepted
  Folioceros satpurensis D.C. Bharadwaj & K.P. Srivast. -- accepted
  Frangula purshiana (DC.) A. Gray -- not accepted -- Cascara buckthorn, Pursh's buckthorn
  Franseria confertiflora (DC.) Rydb. -- not accepted
  Fraxinus berlandierana DC. -- not accepted
  Fraxinus berlandieriana DC. -- accepted -- Mexican ash
  Friesodielsia obovata (Benth.) Verdc. -- accepted -- monkey fingers
  Funaria muhlenbergii Hedw. f. ex Turn. 1804 (non Turn. 1805) nec Lam & DC. -- accepted -- Muhlenberg's funaria moss
  Gaillardia drummondii (Hook.) DC. -- not accepted
  Galactia dubia DC. -- accepted -- West Indian milkpea
  Galarhoeus flavicomus (DC.) Fourr. -- not accepted
  Galinsoga caracasana (DC.) Sch. Bip. -- not accepted
  Galium anglicum var. parvifolium (Gaudich. ex Roem. & Schult.) DC. -- not accepted
  Galium aparine var. vaillantii (DC.) Koch -- not accepted
  Galium boreale var. hyssopifolium (Hoffm.) DC. -- not accepted
  Galium boreale var. intermedium DC. -- not accepted
  Galium boreale var. scabrum DC. -- not accepted
  Galium litigiosum var. nanum DC. -- not accepted
  Galium puncticulosum var. pilosum (Aiton) DC. -- not accepted
  Galium spurium var. vaillantii (DC.) Gren. & Godr. -- not accepted
  Galium spurium var. vaillantii (DC.) G. Beck -- not accepted
  Galium triflorum var. viridiflorum DC. -- not accepted
  Galium uncinulatum DC. -- accepted -- bristly bedstraw
  Galium vaillantii DC. -- not accepted
  Garcinia tinctoria (DC.) Dunn -- not accepted
  Gardenia taitensis DC. -- accepted -- Tahitian gardenia
  Gazania longiscapa DC. -- not accepted
  Geniostoma micranthum DC. -- accepted
  Geniostoma micranthum var. micranthum DC. -- accepted
  Genista aetnensis (Raf. ex Biv.) DC. -- accepted -- Mt. Etna broom
  Geoprumnon mexicanum (A. DC.) Rydb. -- not accepted
  Geranium erianthum DC. -- accepted -- woolly geranium
  Geranium potentilloides L'Hér. ex DC. -- accepted -- cinquefoil geranium
  Geranium pratense var. erianthum (DC.) B. Boivin -- not accepted
  Geranium retrorsum L'Hér. ex DC. -- accepted -- New Zealand geranium
  Gesneria acaulis Fl. Mex. ex DC. -- not accepted
  Gesneria angustior (DC.) Kuntze -- not accepted
  Gesneria bulbosa var. cooperi (hort. ex DC.) Klotzsch -- not accepted
  Gesneria cooperi hort. ex DC. -- not accepted
  Gesneria corymbosa DC. -- not accepted
  Gesneria crenulata A. DC. -- not accepted
  Gesneria cuneifolia (DC.) Fritsch -- accepted -- yerba parrera
  Gesneria exogonia Sessé & Moc. ex DC. -- not accepted
  Gesneria latifolia var. gaudichaudii DC. -- not accepted
  Gesneria longiflora Fl. Mex. ex DC. -- not accepted
  Gesneria maculata Moc. & Sessé ex DC. -- not accepted
  Gesneria oxyphylla DC. -- not accepted
  Gesneria pedunculosa (DC.) Fritsch -- accepted -- arbol de Navidad
  Gesneria petiolaris (DC.) Kuntze -- not accepted
  Gesneria plumierana (DC.) Kuntze -- not accepted
  Gesneria polyantha DC. -- not accepted
  Gesneria portoricensis DC. ex Bello -- not accepted
  Gesneria quaterniflora Fl. Mex. ex DC. -- not accepted
  Gesneria schiedeana (DC.) Hook. -- not accepted
  Gesneria spicata var. schiedeana DC. -- not accepted
  Gesneria tenella Fl. Mex. ex DC. -- not accepted
  Gesneria tomentosa Moc. ex DC. -- not accepted
  Gesneria uniflora DC. -- not accepted
  Gesneria vargasii DC. -- not accepted
  Gesneria vauthieri DC. -- not accepted
  Gesneria velutina Willd. ex DC. -- not accepted
  Gloxinia antirrhina DC. -- not accepted
  Gloxinia erinoides (DC.) Roalson & Boggan -- accepted
  Gloxinia hirsuta (DC.) Wiehler -- not accepted
  Glycine wightii (Wight & Arn.) Verdc. -- not accepted -- perennial soybean
  Glycine wightii var. mearnsii (De Wild.) Verdc. -- not accepted
  Glycine wrightii (Wight & Arn.) Verdc. -- not accepted
  Glyptopleura D.C. Eaton -- accepted -- glyptopleura
  Glyptopleura marginata D.C. Eaton -- accepted -- carveseed
  Gnaphalium attenuatum DC. -- not accepted
  Gnaphalium brachypterum DC. -- not accepted
  Gnaphalium californicum DC. -- not accepted
  Gnaphalium canescens DC. -- not accepted
  Gnaphalium canescens ssp. canescens DC. -- not accepted
  Gnaphalium gymnocephalus DC. -- not accepted
  Gochnatia hypoleuca (DC.) A. Gray -- accepted -- shrubby bullseye
  Gomphia ilicifolia DC. -- not accepted
  Gouldia affinis (DC.) Wilbur -- not accepted
  Graffenrieda DC. -- accepted
  Gratiola ebracteata Benth. ex A. DC. -- accepted -- bractless hedgehyssop
  Grewia flava DC. -- accepted
  Grindelia hirsutula ssp. rubricaulis (DC.) D.D. Keck -- not accepted
  Grindelia integrifolia DC. -- accepted -- Puget Sound gumweed
  Grindelia integrifolia var. integrifolia DC. -- not accepted -- Puget Sound gumweed
  Grindelia microcephala DC. -- accepted -- littlehead gumweed
  Grindelia microcephala var. microcephala DC. -- not accepted -- littlehead gumweed
  Grindelia stricta DC. -- not accepted -- Oregon gumweed
  Grindelia stricta var. stricta DC. -- not accepted -- Oregon gumweed
  Gutierrezia californica (DC.) Torr. & A. Gray -- accepted -- California snakeweed, San Joaquin snakeweed
  Gutierrezia dracunculoides (DC.) S.F. Blake -- not accepted -- prairie broomweed
  Gutierrezia microcephala (DC.) A. Gray -- accepted -- threadleaf snakeweed
  Gutierrezia sarothrae var. microcephala (DC.) L.D. Benson -- not accepted
  Gutierrezia texana (DC.) Torr. & A. Gray -- accepted -- Texas broomweed, Texas snakeweed
  Gutierrezia texana var. texana (DC.) Torr. & A. Gray -- accepted -- Texas snakeweed
  Gymnocarpium dryopteris var. pumilum (DC.) B. Boivin -- not accepted
  Gynandropsis DC. -- accepted -- spider-wisp
  Gynura aurantiaca (Blume) DC. -- accepted -- velvetplant
  Haemadictyon exsertum A. DC. -- not accepted
  Halimodendron Fisch. ex DC. -- accepted -- salttree, Siberian sandthorn
  Haplopappus acaulis var. glabratus D.C. Eaton -- not accepted
  Haplopappus ciliatus (Nutt.) DC. -- not accepted -- Spanish gold, waxed goldenweed
  Haplopappus foliosus DC. -- accepted
  Haplopappus gymnocephalus DC. -- not accepted
  Haplopappus lanceolatus ssp. tenuicaulis (D.C. Eaton) H.M. Hall -- not accepted
  Haplopappus lanceolatus ssp. vaseyi (Parry ex D.C. Eaton) H.M. Hall -- not accepted
  Haplopappus lanceolatus var. tenuicaulis (D.C. Eaton) A. Gray -- not accepted
  Haplopappus lanceolatus var. vaseyi Parry ex D.C. Eaton -- not accepted
  Haplopappus linearifolius DC. -- not accepted
  Haplopappus nanus (Nutt.) D.C. Eaton -- not accepted
  Haplopappus phyllocephalus DC. -- not accepted
  Haplopappus spinulosus (Pursh) DC. -- not accepted -- cutleaf ironplant, ironplant, lacy tansyaster
  Haplopappus squarrosus ssp. grindelioides (DC.) D.D. Keck -- not accepted
  Haplophyton A. DC. -- accepted
  Haplophyton cimicidum A. DC. -- accepted -- cockroachplant
  Harpagophytum DC. ex Meisn. -- accepted
  Harpagophytum procumbens (Burch.) DC. ex Meisn. -- accepted -- devil's-claw
  Hazardia squarrosa var. grindelioides (DC.) W.D. Clark -- accepted -- sawtooth bristleweed
  Hebeclinium DC. -- accepted -- thoroughwort
  Hebeclinium macrophyllum (L) DC -- accepted -- largeleaf thoroughwort
  Hedeoma ciliata (Benth.) Benth. ex A. DC. -- not accepted
  Hedyotis boscii DC. -- not accepted
  Hedyotis salzmannii (DC.) Steud. -- not accepted
  Hedyotis strigulosa (Bartlett ex DC.) Fosberg -- not accepted
  Helenium elegans DC. -- accepted -- pretty sneezeweed
  Helenium elegans var. elegans DC. -- accepted -- pretty sneezeweed
  Helenium microcephalum DC. -- accepted -- littlehead tarweed, smallhead sneezeweed
  Helenium microcephalum var. microcephalum DC. -- accepted -- smallhead sneezeweed
  Helenium puberulum DC. -- accepted -- rosilla
  Helenium setigerum (DC.) Britton & Rusby -- not accepted
  Helianthus annuus var. macrocarpus (DC.) Cockerell -- not accepted
  Helianthus californicus DC. -- accepted -- California sunflower
  Helianthus ciliaris DC. -- accepted -- blueweed, blueweed sunflower, Texas blueweed, Texas-blueweed, yerba parda
  Helianthus orgyalis DC. -- not accepted
  Helichrysum petiolatum (L) DC -- not accepted
  Heliocereus speciosissimus (DC.) Y. Itô -- not accepted
  Heliotropium curassavicum var. obovatum DC. -- accepted -- seaside heliotrope
  Heliotropium ramosissimum (Lehm.) DC. -- accepted -- wavy heliotrope
  Hemiachyris texana DC. -- not accepted
  Hemiscola diffusa (Banks ex DC.) Iltis -- accepted -- spreading spiderflower
  Hemizonia DC. -- accepted -- tarweed
  Hemizonia congesta DC. -- accepted -- hayfield tarweed
  Hemizonia congesta ssp. congesta DC. -- accepted -- hayfield tarweed
  Hemizonia congesta ssp. luzulifolia (DC.) Babc. & H.M. Hall -- accepted -- hayfield tarweed
  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 luzulifolia DC. -- not accepted
  Hemizonia luzulifolia ssp. luzulifolia DC. -- not accepted -- hayfield tarweed
  Hemizonia truncata (DC.) A. Gray -- not accepted
  Henriettea DC. -- accepted -- camasey
  Hepatica acutiloba DC. -- not accepted
  Hepatica americana (DC.) Ker Gawl. -- not accepted
  Hepatica triloba var. americana DC. -- not accepted
  Herniaria cinerea DC. -- not accepted
  Herniaria hirsuta ssp. cinerea (DC.) Cout. -- not accepted -- hairy rupturewort
  Herniaria hirsuta var. cinerea (DC.) Loret & Barrandon -- accepted -- hairy rupturewort
  Herrickia kingii (D.C. Eaton) Brouillet, Urbatsch & R.P. Roberts -- accepted -- King's aster
  Herrickia kingii var. kingii (D.C. Eaton) Brouillet, Urbatsch & R.P. Roberts -- accepted -- King's aster
  Heteropteris platyptera DC. -- not accepted
  Heteropterys platyptera DC. -- not accepted
  Heterotheca canescens (DC.) Shinners -- accepted -- gray goldaster, hoary false goldenaster, hoary falsegoldenaster
  Heterotheca chrysopsides DC. -- not accepted -- butterfly falsegoldenaster
  Heterotheca leptoglossa DC. -- accepted -- lacy falsegoldenaster
  Heterotheca scabra (Pursh) DC. -- not accepted
  Heterotrichum DC. -- not accepted
  Heterotrichum angustifolium DC. -- not accepted -- narrowleaf terciopelo
  Hieracium X brachiatum Bethel. ex DC. -- accepted
  Hippocrepis scabra DC. -- accepted
  Hoita macrostachya (DC.) Rydb. -- accepted -- large leather-root
  Holarrhena antidysenterica (L.) Wall. ex A. DC. -- not accepted -- tellicherry bark
  Holcus saccharoides var. laguroides (DC.) Hack. -- not accepted
  Holocarpha macradenia (DC.) Greene -- accepted -- Santa Cruz tarplant
  Hydrangea arborescens ssp. discolor (Ser. ex DC.) E.M. McClint. -- not accepted
  Hylocereus extensus (Salm-Dyck ex DC.) Britton & Rose ex Rose -- accepted
  Hylocereus setaceus (Salm-Dyck ex DC.) Ralf Bauer -- accepted
  Hymenatherum pentachaetum DC. -- not accepted
  Hymenopappus artemisiifolius DC. -- accepted -- oldplainsman, woolly-white
  Hymenopappus artemisiifolius var. artemisiifolius DC. -- accepted -- oldplainsman, woolly-white
  Hymenopappus scabiosaeus var. artemisiifolius (DC.) Gandhi & R.D. Thomas -- not accepted
  Hymenophyllum baldwinii D.C. Eaton -- not accepted
  Hymenothecium tenellum (Cav. ex DC.) Lag. -- not accepted
  Hymenoxys cooperi var. canescens (D.C. Eaton) K.F. Parker -- not accepted -- Cooper's frostmat, Cooper's hymenoxys, Cooper's rubberweed
  Hymenoxys odorata DC. -- accepted -- bitter rubberweed, bitterweed, poison rubberweed, western bitterweed
  Hymenoxys scaposa (DC.) K.F. Parker -- not accepted -- stemmy hymenoxys
  Hyperbaena domingensis (DC.) Benth. -- accepted -- forest snakevine
  Hypopitys americana (DC.) Small -- not accepted
  Impatiens parviflora DC. -- accepted -- smallflower touch-me-not
  Incarvillea dubia Wall. ex DC. -- not accepted
  Indigofera mucronata Spreng. ex DC. -- not accepted
  Indigofera sessilifolia DC. -- accepted
  Inga sertulifera DC. -- accepted
  Isnardia repens DC. -- not accepted
  Isocarpha oppositifolia var. achyranthes (DC.) D.J. Keil & Stuessy -- accepted
  Isoloma schiedeanum (DC.) Hemsl. -- not accepted
  Iva angustifolia Nutt. ex DC. -- accepted -- narrowleaf marsh elder, narrowleaf marshelder, narrowleaf sumpweed, Texas marsh elder
  Jacquinia umbellata A. DC. -- not accepted -- chirriador
  Jambosa malaccensis (L.) DC. -- not accepted
  Jaquinia umbellata A. DC. -- not accepted
  Jasminum marianum DC. -- accepted
  Juglans boliviana (C. DC.) Dode -- accepted -- Bolivian walnut
  Juglans jamaicensis C. DC. -- accepted -- nogal, West Indian walnut
  Juncus effusus var. subglomeratus Lam. & DC. -- not accepted
  Jussiaea decurrens (Walter) DC. -- not accepted
  Jussiaea octofila DC. -- not accepted
  Jussiaea suffruticosa var. octofila (DC.) Munz -- not accepted
  Kadua affinis DC. -- accepted
  Kalanchoe laciniata (L.) DC. -- accepted -- Christmastree plant
  Keerlia skirrhobasis DC. -- not accepted
  Kentranthus ruber (L.) DC. -- not accepted -- red valerian
  Kerria DC. -- accepted
  Kerria japonica (L.) DC. -- accepted -- Japanese rose
  Khaya anthotheca (Welw.) C. DC. -- accepted -- Nyasaland mahogany
  Kigelia DC. -- accepted -- sausage tree
  Kigelia pinnata (Jacq.) DC. -- not accepted
  Klugia notoniana (Wall.) A. DC. -- not accepted
  Klugia zeylanica A. DC. -- not accepted
  Koeleria brachystachya DC. -- not accepted
  Koeleria calycina (Loefl.) DC. & Lam. -- not accepted
  Koeleria glauca (Spreng.) DC. -- accepted
  Koeleria pennsylvanica (Spreng.) DC. -- not accepted
  Koellikeria erinoides (DC.) Mansf. -- not accepted
  Kohleria schiedeana (DC.) Hanst. -- not accepted
  Kopsia fruticosa (Roxb.) A. DC. -- accepted
  Korthalsella taeniodes (Comm. ex DC.) Engl. -- accepted -- bog korthal mistletoe, Kauai korthal mistletoe, Kaumahana, po'owaha
  Koyamacalia auriculata (DC.) H. Rob. & Brettell -- not accepted -- koyamacalia
  Krameria secundiflora auct. non DC. -- not accepted
  Krigia caespitosa var. gracilis (DC.) K.L. Chambers -- accepted -- Texas dwarfdandelion
  Krigia gracilis (DC.) Shinners -- not accepted
  Lacinaria squarrosa var. intermedia (Lunell) DC. -- not accepted
  Lactuca pulchell (Pursh) DC. -- not accepted
  Lactuca pulchella (Pursh) DC. -- not accepted -- blue lettuce
  Laennecia filaginoides DC. -- accepted -- Trans-Pecos marshtail
  Lagunaria (DC.) Rchb. -- accepted -- cow itch tree
  Lamarckia tenella DC. -- not accepted
  Landolphia heudelotii A. DC. -- accepted -- landolphia rubber
  Landolphia senegalensis (A. DC.) Kotschy & Peyr. -- not accepted
  Laothoe pomeridiana (DC.) Raf. -- not accepted
  Larrea divaricata ssp. tridentata (DC.) Felger & C.H. Lowe -- not accepted
  Larrea tridentata (DC.) Coville -- accepted -- creosote bush, creosotebush
  Larrea tridentata var. tridentata (DC.) Coville -- not accepted -- creosote bush, creosotebush
  Lasianthaea DC. -- accepted -- lasianthaea
  Lasthenia californica DC. ex Lindl. -- accepted -- California goldfields, goldfields
  Lasthenia californica ssp. californica DC. ex Lindl. -- accepted -- California goldfields
  Lasthenia glaberrima DC. -- accepted -- smooth goldfields
  Lasthenia gracilis (DC.) Greene -- accepted -- needle goldfields
  Lasthenia microglossa (DC.) Greene -- accepted -- smallray goldfields
  Lasthenia minor (DC.) Ornduff -- accepted -- coastal goldfields
  Lasthenia minor var. minor (DC.) Ornduff -- not accepted
  Lathyrus ochrus (L.) DC. -- accepted -- alverjana, Cyprus-vetch, ochrus-vetch, tapisote
  Lavandula vera DC. -- not accepted
  Lavoisiera DC. -- accepted
  Lavoisiera itambana DC. -- accepted
  Layia Hook. & Arn. ex DC. -- accepted -- tidytips
  Layia chrysanthemoides (DC.) A. Gray -- accepted -- smooth tidytips
  Layia chrysanthemoides ssp. chrysanthemoides (DC.) Gray -- not accepted -- smooth tidytips
  Layia gaillardioides (Hook. & Arn.) DC. -- accepted -- woodland tidytips
  Layia heterotricha (DC.) Hook. & Arn. -- accepted -- paleyellow tidytips
  Layia hieracioides (DC.) Hook. & Arn. -- accepted -- tall tidytips
  Leontodon latiloba (DC.) Britton -- not accepted
  Lepidium africanum (Burm. f.) DC. -- accepted -- African pepperwort
  Lepidium menziesii DC. -- not accepted
  Lepidium virginicum ssp. menziesii (DC.) Thell. -- accepted -- Menzies' pepperweed
  Lepidium virginicum var. menziesii (DC.) C.L. Hitchc. -- not accepted -- Menzies' pepperweed
  Leptoglottis nuttallii DC. ex Britton & Rose -- not accepted
  Leptosyne douglasii DC. -- not accepted
  Lespedeza hirta var. longifolia (DC.) Fernald -- not accepted
  Lespedeza longifolia DC. -- not accepted
  Lespedeza thunbergii (DC.) Nakai -- accepted -- Thunberg's lespedeza
  Lespedeza virgata (Thunb.) DC. -- accepted -- wand lespedeza
  Lespedeza X longifolia DC. (pro. sp.) -- accepted -- longleaf lespedeza
  Lessertia DC. -- accepted
  Lessertia microphylla (Burch. ex DC.) Goldblatt & J.C. Manning -- accepted
  Lessingia filaginifolia var. californica (DC.) M.A. Lane -- not accepted
  Leucaena esculenta (Sessé & Moc. ex DC.) Benth. -- accepted -- guaje
  Leucanthemum arcticum (L) DC -- not accepted
  Leucanthemum integrifolium (Richardson) DC. -- not accepted -- entireleaf daisy
  Leucanthemum ircutianum (Turcz.) DC. -- not accepted
  Leucanthemum maximum (Ramond) DC. -- accepted -- max chrysanthemum
  Leucanthemum vulgare ssp. ircutianum (DC.) Tzvelev -- not accepted
  Leucopterum parvifolium (DC.) Small -- not accepted
  Liatris graminifolia var. racemosa (DC.) Venard -- not accepted
  Liatris mucronata DC. -- not accepted -- cusp blazing star, narrowleaf gayfeather
  Liatris punctata var. mucronata (DC.) B.L. Turner -- accepted -- cusp blazing star, densespike blazing star
  Liatris spicata var. racemosa DC. -- not accepted -- dense blazing star
  Liebigia elongata (Blume) A. DC. -- not accepted
  Liebigia speciosa (Blume) DC. -- not accepted
  Limnosciadium pinnatum (DC.) Mathias & Constance -- accepted -- tansy dogshade
  Lipochaeta DC. -- accepted -- nehe
  Lipochaeta DC. -- not accepted
  Lipochaeta connata (Gaudich.) DC. -- accepted -- nehe
  Lipochaeta connata var. connata (Gaudich.) DC. -- accepted -- nehe
  Lipochaeta lavarum (Gaudich.) DC. -- not accepted -- coastal nehe
  Lipochaeta lobata (Gaudich.) DC. -- accepted -- shrubland nehe
  Lipochaeta lobata var. lobata (Gaudich.) DC. -- accepted -- shrubland nehe
  Lipochaeta succulenta (Hook. & Arn.) DC. -- accepted -- seaside nehe
  Lithospermum matamorense DC. -- accepted -- rough gromwell, rough stoneseed
  Lithospermum tuberosum Rugel ex DC. -- accepted -- tuberous gromwell, tuberous stoneseed
  Lobanilia Radcl.-Sm. -- accepted
  Lobanilia luteobrunnea (Baker) Radcl.-Sm. -- accepted
  Lobanilia ovalis (Baill.) Radcl.-Sm. -- accepted
  Lobelia appendiculata A. DC. -- accepted -- earflower lobelia, pale lobelia
  Lobelia appendiculata var. appendiculata A. DC. -- not accepted -- pale lobelia
  Lobelia assurgens var. portoricensis (A. DC.) Urb. -- not accepted
  Lobelia berlandieri A. DC. -- accepted -- Berlandier's lobelia
  Lobelia berlandieri ssp. berlandieri A. DC. -- accepted -- Berlandier's lobelia
  Lobelia berlandieri var. berlandieri A. DC. -- not accepted -- Berlandier's lobelia
  Lobelia boykinii Torr. & A. Gray ex A. DC. -- accepted -- Boykin's lobelia
  Lobelia brachypoda (A. Gray) A. DC. ex Small -- not accepted
  Lobelia brevifolia Nutt. ex A. DC. -- accepted -- shortleaf lobelia
  Lobelia gaudichaudii A. DC. -- accepted -- Koolau Range lobelia
  Lobelia gaudichaudii ssp. gaudichaudii A. DC. -- not accepted -- Koolau Range lobelia
  Lobelia laxiflora ssp. angustifolia (A. DC.) Eakes & Lammers -- accepted -- Sierra Madre lobelia
  Lobelia laxiflora var. angustifolia A. DC. -- not accepted -- Sierra Madre lobelia
  Lobelia leptostachys A. DC. -- not accepted
  Lobelia robusta var. portoricensis (A. DC.) McVaugh -- not accepted -- robust lobelia
  Lobelia rotundifolia Juss. ex A. DC. -- accepted -- roundleaf lobelia
  Lobelia siphilitica var. ludoviciana A. DC. -- accepted -- great blue lobelia
  Lobelia spicata var. leptostachys (A. DC.) Mack. & Bush -- not accepted -- palespike lobelia
  Lolium multiflorum var. muticum DC. -- not accepted
  Lonchocarpus domingensis (Turpin ex Pers.) DC. -- accepted -- geno geno
  Lonchocarpus heptaphyllus (Poir.) DC. -- accepted -- broadleaf lancepod
  Lonchocarpus latifolius Kunth ex DC. -- not accepted
  Lonchocarpus nicou (Aubl.) DC. -- not accepted -- barbasco
  Lonchocarpus pentaphyllus (Poir.) Kunth ex DC. -- not accepted -- broadleaf lancepod
  Lonchocarpus violaceus auct. non (Jacq.) Kunth ex DC. -- not accepted
  Lonicera ciliosa (Pursh) Poir. ex DC. -- accepted -- orange honeysuckle
  Lotononis (DC.) Eckl. & Zeyh. -- accepted
  Lotus hispidus Desf. ex DC. -- not accepted
  Lotus sessilifolius DC. -- accepted
  Lucuma multiflora A. DC. -- not accepted
  Lucuma nervosa A. DC. -- not accepted
  Lucya DC. -- accepted
  Ludwigia decurrens (DC.) Walter -- accepted -- wingleaf primrose-willow, wingleaf waterprimrose
  Ludwigia longifolia (DC.) H. Hara -- accepted -- longleaf primrose-willow
  Ludwigia octovalvis var. octofila (DC.) Alain -- not accepted
  Ludwigia palustris var. americana (DC.) Fernald & Griscom -- not accepted
  Luma apiculata (DC.) Burret -- not accepted
  Luzula DC. -- accepted -- wood rush, woodrush
  Luzula campestris (L.) DC. -- accepted -- field woodrush
  Luzula campestris var. campestris (L.) DC. -- not accepted -- field woodrush
  Luzula forsteri (Sm.) DC. -- accepted -- southern woodrush
  Luzula nivea (Nathh.) DC. -- accepted
  Luzula spadicea (All.) DC. -- not accepted
  Luzula spicata (L.) DC. -- accepted -- spiked wood-rush, spiked woodrush
  Luzula spicata var. spicata (L.) DC. -- not accepted
  Luzula sudetica auct. non (Willd.) DC. -- not accepted -- Sudetic Mountain woodrush
  Lycopodium obscurum var. dendroideum (Michx.) D.C. Eaton -- not accepted
  Lygodesma aphylla (Nutt.) D.C. -- not accepted
  Lygodesmia aphylla (Nutt.) DC. -- accepted -- rose rush
  Lyonia ligustrina (L.) DC. -- accepted -- he-huckleberry, maleberry, seedy-buckberry
  Lyonia ligustrina var. capreifolia (P. Watson) DC. -- not accepted
  Lyonia ligustrina var. ligustrina (L.) DC. -- accepted -- maleberry
  Lyonia ligustrina var. salicifolia (P. Watson) DC. -- not accepted
  Lythrum salicaria var. tomentosum (Mill.) DC. -- not accepted
  Lythrum salicaria var. vulgare DC. -- not accepted
  Maba madagascariensis A. DC. -- not accepted
  Macairea DC. -- accepted
  Macfadyena A. DC. -- accepted
  Machaeranthera gymnocephala auct. non (DC.) Shinners -- not accepted
  Machaeranthera kingii (D.C. Eaton) Cronquist & D.D. Keck -- not accepted
  Machaeranthera phyllocephala (DC.) Shinners -- not accepted -- camphor daisy
  Macrochlamys patrisii (DC.) Decne. -- not accepted
  Macromeria viridiflora DC. -- not accepted -- giant trumpets, giant-trumpets, gianttrumpets
  Macromeria viridiflora var. viridiflora DC. -- not accepted -- giant trumpets, giant-trumpets
  Macroptilium atropurpureum (DC.) Urb. -- accepted -- purple bush-bean, purple bushbean
  Macrorhynchus glaucus var. laciniatus D.C. Eaton -- not accepted
  Macrotyloma (Wight & Arn.) Verdc. -- accepted
  Macrotyloma axillare (E. Mey.) Verdc. -- accepted -- perennial horsegram
  Macrotyloma axillare var. axillare (E. Mey.) Verdc. -- accepted -- perennial horsegram
  Macrotyloma axillare var. glabrum (E. Mey.) Verdc. -- accepted -- perennial horsegram
  Macrotyloma tenuiflorum (Micheli) Verdc. -- accepted
  Macrotyloma uniflorum (Lam.) Verdc. -- accepted -- horsegram
  Macrozamia macdonnellii (F. Muell. ex Miq.) A. DC. -- accepted
  Macrozamia miquelii (F. Muell.) A. DC. -- accepted
  Macrozamia oldfieldii (Miq.) A. DC. -- not accepted
  Magnolia doltsopa (Buch.-Ham. ex DC.) Figlar -- accepted -- sweet michelia
  Magnolia kobus DC. -- accepted -- Kobus magnolia
  Malacothrix DC. -- accepted -- desert dandelion, desertdandelion, malacothrix
  Malacothrix californica DC. -- accepted -- California desert dandelion, California desertdandelion
  Malacothrix californica var. glabrata A. Gray ex D.C. Eaton -- not accepted
  Malacothrix floccifera (DC.) S.F. Blake -- accepted -- woolly desertdandelion, wooly desert dandelion
  Malacothrix glabrata (A. Gray ex D.C. Eaton) A. Gray -- accepted -- smooth desert dandelion, smooth desertdandelion
  Malpighia emarginata Sessé & Moc. ex DC. -- accepted -- Barbados cherry
  Malvaviscus arboreus var. penduliflorus (DC.) Schery -- not accepted
  Malvaviscus penduliflorus DC. -- accepted -- mazapan
  Mammillaria compressa DC. -- accepted
  Mammillaria compressa ssp. compressa DC. -- accepted
  Mammillaria conoidea DC. -- not accepted
  Mammillaria crinita DC. -- accepted
  Mammillaria crinita ssp. crinita DC. -- accepted
  Mammillaria elegans DC. -- not accepted
  Mammillaria elongata DC. -- accepted
  Mammillaria elongata ssp. echinaria (DC.) D.R. Hunt -- accepted
  Mammillaria elongata ssp. elongata DC. -- accepted
  Mammillaria glomerata DC. -- not accepted
  Mammillaria longimamma DC. -- accepted
  Mammillaria longimanna DC. -- not accepted
  Mammillaria octacantha DC. -- not accepted
  Mammillaria sempervivi DC. -- accepted
  Manilkara bidentata (A. DC.) A. Chev -- accepted -- bulletwood
  Mansoa DC. -- accepted -- garlicvine
  Mansoa hymenacea (DC.) A.H. Gentry -- not accepted -- membranous garlicvine
  Mansoa hymenaea (DC.) A.H. Gentry -- accepted -- membranous garlicvine
  Margaritopsis microdon (DC.) C.M. Taylor -- accepted
  Marginatocereus marginatus (DC.) Backeb. -- not accepted
  Marshallia caespitosa Nutt. ex DC. -- accepted -- puffballs, seep marshallia
  Marshallia caespitosa var. caespitosa Nutt. ex DC. -- not accepted -- puffballs
  Maruta cotula (L) DC -- not accepted
  Mascagnia macroptera (DC.) Nied. -- not accepted
  Matayba domingensis (DC.) Radlk. -- accepted -- negra lora
  Matricaria courrantiana DC. -- not accepted -- crown mayweed
  Matricaria discoidea DC. -- accepted -- disc mayweed, pineapple weed, pineappleweed
  Matthiola bicornis (Sibthorp & Sm.) DC. -- not accepted
  Matthiola longipetala (Vent.) DC. -- accepted -- night scented stock
  Medicago minima var. longiseta DC. -- not accepted
  Medicago praecox DC. -- accepted -- early medick, Mediterranean medick, small-leaved bur medick
  Meibomia incana (DC.) Vail -- not accepted
  Meibomia lineata (DC.) Kuntze -- not accepted
  Meibomia rotundifolia (DC.) Kuntze -- not accepted
  Melampodium cinereum DC. -- accepted -- hoary blackfoot, rockdaisy
  Melampodium cinereum var. cinereum DC. -- not accepted -- hoary blackfoot
  Melampodium cinereum var. ramosissimum (DC.) A. Gray -- not accepted -- hoary blackfoot
  Melampodium divaricatum (Rich.) DC. -- accepted -- boton de oro
  Melilotus gracilis DC. -- not accepted
  Melilotus leucanthus W.D.J. Koch ex DC. -- not accepted
  Melochia tomentosa var. frutescens (Jacq.) A. DC. -- not accepted
  Menodora heterophylla Moric. ex DC. -- accepted -- low menodora
  Mertensia lanceolata (Pursh) DC. -- accepted -- lanceleaf bluebells, prairie bluebells
  Mertensia lanceolata var. lanceolata (Pursh) DC. -- accepted -- prairie bluebells
  Mertensia pilosa (Cham.) DC. -- not accepted -- hairy bluebells
  Michelia doltsopa Buch.-Ham. ex DC. -- not accepted -- sweet michelia
  Miconia affinis DC. -- accepted -- saquiyac
  Miconia calvescens DC. -- accepted -- velvet tree
  Miconia impetiolaris (Sw.) D. Don ex DC. -- accepted -- camasey de costilla
  Miconia impetionlaris (Sw.) D. Don ex DC. -- not accepted
  Miconia lanata (DC.) Triana -- accepted -- hairy johnnyberry
  Miconia microcarpa DC. -- not accepted
  Miconia prasina (Sw.) DC. -- accepted -- granadillo bobo
  Miconia punctata (Desr.) D. Don ex DC. -- accepted -- auquey
  Miconia pyramidalis (Descr.) DC. -- accepted
  Miconia racemosa (Aubl.) DC. -- accepted -- camasey felpa
  Miconia rubiginosa (Bonpl.) DC. -- accepted -- peralejo
  Miconia serrulata (DC.) Naudin -- accepted -- jau jau
  Miconia thomasiana DC. -- accepted -- camasey tomaso
  Microcycas (Miq.) A. DC. -- accepted
  Microcycas calocoma (Miq.) A. DC. -- accepted
  Micropholis guyanensis (A. DC.) Pierre -- accepted -- wild balata
  Micropsis DC. -- accepted
  Microseris douglasii (DC.) Sch. Bip. -- accepted -- Douglas' silverpuffs
  Microseris douglasii ssp. douglasii (DC.) Sch. Bip. -- accepted -- Douglas' silverpuffs
  Microseris lindleyi (DC.) A. Gray -- not accepted
  Mikania badieri DC. -- not accepted
  Mikania batatifolia DC. -- accepted
  Mikania batatifolia auct. non DC. -- not accepted -- southern hempvine
  Mikania congesta DC. -- accepted -- guaco
  Mikania hookeriana DC. -- accepted
  Mikania hookeriana var. badieri (DC.) H. Rob. -- not accepted
  Mikania micrantha var. congesta (DC.) B.L. Rob. -- not accepted
  Milium velutinum DC. -- not accepted
  Miltitzia lutea (Hook. & Arn.) A. DC. -- not accepted
  Mimosa nuttallii (DC. ex Britton & Rose) B.L. Turner -- accepted -- catclaw sensitivebriar, Nuttall's sensitive-briar
  Mimosa quadrivalvis var. leptocarpa (DC.) Barneby -- not accepted -- fourvalve mimosa
  Mimosa quadrivalvis var. nuttallii (DC. ex Britton & Rose) L.S. Beard ex Barneby -- not accepted
  Mimulus guttatus DC. -- accepted -- common monkeyflower, seep monkeyflower
  Mimulus guttatus var. guttatus DC. -- not accepted
  Mimulus langsdorffii var. guttatus (DC.) Jeps. -- not accepted
  Mimulus langsdorfii var. guttatus (DC.) Jeps. -- not accepted
  Mimusops bidentata auct. non A. DC. -- not accepted
  Mimusops caffra E. Mey. ex A. DC. -- accepted
  Misodendrum Banks ex DC. -- accepted
  Misodendrum brachystachyum DC. -- accepted
  Mitracarpus hirtus (L.) DC. -- accepted -- tropical girdlepod
  Mitracarpus villosus (Sw.) Cham. & Schltdl. ex DC. -- not accepted
  Monolopia DC. -- accepted -- monolopia
  Monolopia major DC. -- accepted -- cupped monolopia
  Monotropa hypopithys var. americana (DC.) Domin -- not accepted
  Monotropa hypopitys var. americana (DC.) Domin -- not accepted
  Montezuma speciosissima DC. -- not accepted
  Montia parvifolia (Moc. ex DC.) Greene -- accepted -- littleleaf minerslettuce
  Montia parvifolia ssp. parvifolia (Moc. ex DC.) Greene -- not accepted -- littleleaf minerslettuce
  Moricandia DC. -- accepted
  Moricandia arvensis (L.) DC. -- accepted -- purple mistress
  Mucuna gigantea (Willd.) DC. -- accepted -- seabean
  Mucuna pruriens (L.) DC. -- accepted -- cowitch
  Mucuna pruriens var. pruriens (L.) DC. -- accepted -- cowitch
  Muhlenbergia microsperma (DC.) Trin. -- not accepted -- littleseed muhly
  Muhlenbergia microsperma (DC.) Kunth -- accepted
  Muhlenbergia polypogon (DC.) Kunth -- not accepted
  Mulgedium floridanum (L) DC -- not accepted
  Mundtia spinosa (L.) DC. -- not accepted
  Mundulea DC. ex Miq. -- accepted
  Muraltia DC. -- accepted
  Muscari racemosum (L.) Lam. & DC. -- not accepted
  Myrceugenia apiculata (DC.) Nied. -- not accepted -- Chilean myrtle
  Myrcia DC. ex Guill. -- accepted -- rodwood
  Myrcia amazonica DC. -- accepted
  Myrcia berberis DC. -- not accepted
  Myrcia deflexa (Poir.) DC. -- accepted -- cieneguillo
  Myrcia fallax (Rich.) DC. -- not accepted -- curame
  Myrcia leptoclada DC. -- not accepted -- guayabacon
  Myrcia splendens (Sw.) DC. -- accepted -- punchberry, spike milfoil
  Myrica gale var. tomentosa C. DC. -- not accepted
  Myriophyllum alteniflarum DC. -- not accepted
  Myriophyllum alterniflorum DC. -- accepted -- alternateflower watermilfoil
  Myriophyllum aquaticum (Vell.) Verdc. -- accepted -- Brazilian watermilfoil, parrot feather, parrot feather watermilfoil, parrot's-feather
  Myrsine cubana A. DC. -- not accepted -- Guianese colicwood
  Myrsine floridana A. DC. -- accepted -- Guianese colicwood
  Myrsine lessertiana A. DC. -- accepted -- kolea lau nui
  Myrsine sandwicensis A. DC. -- accepted -- kokea lau li'i
  Nabalus boottii DC. -- not accepted
  Nabalus crepidineus (Michx.) DC. -- not accepted
  Nabalus nanus (Bigelow) DC. -- not accepted
  Nabalus racemosus (Michx.) DC. -- not accepted
  Nabalus virgatus (Michx.) DC. -- not accepted
  Nasturtium microspermum DC. -- not accepted
  Nasturtium sarmentosum (G. Forst. ex DC.) Schinz & Guillaumin -- not accepted
  Negundo mexicanum DC. -- not accepted
  Nematanthus longipes DC. -- not accepted
  Neobuxbaumia polylopha (DC.) Backeb. -- accepted
  Neolloydia conoidea (DC.) Britton & Rose -- accepted -- Biznaga-cónica, Chihuahuan beehive
  Nesogenes A. DC. -- accepted
  Neuroloma nudicaule (L.) DC. -- not accepted
  Nitella hyalina (Dc) Agardh -- accepted
  Noccaea cochleariformis (DC.) Á. Löve & D. Löve -- not accepted
  Nonea lutea (Desr.) Rchb. ex DC. -- accepted -- yellow monkswort
  Nopalxochia phyllanthoides (DC.) Britton & Rose -- not accepted
  Notholaena californica D.C. Eaton -- accepted -- California cloak fern
  Notholaena californica ssp. californica D.C. Eaton -- accepted -- California cloak fern
  Notholaena lemmonii D.C. Eaton -- accepted -- Lemmon's cloak fern
  Notholaena newberryi D.C. Eaton -- not accepted
  Notholaena parryi D.C. Eaton -- not accepted
  Notopleura guadalupensis (DC.) C.M. Taylor -- accepted
  Notopleura guadalupensis ssp. guadalupensis (DC.) C.M. Taylor -- accepted
  Nuphar pumila (Timm) DC. -- not accepted
  Nymphaea ampla (Salisb.) DC. -- accepted -- dotleaf waterlily
  Nymphaea ampla var. ampla (Salisb.) DC. -- not accepted -- dotleaf waterlily
  Nymphaea ampla var. pulchella (DC.) Casp. -- not accepted -- dotleaf waterlily
  Nymphaea minor (Sims) DC. -- not accepted
  Nymphaea pulchella DC. -- not accepted
  Ochrosia mariannensis A. DC. -- accepted
  Ochrosia sandwicensis auct. non A. DC. -- not accepted
  Odostemon fascicularis (DC.) Abrams -- not accepted
  Oenanthe javanica (Blume) DC. -- accepted -- Java waterdropwort
  Oenanthe javanica ssp. javanica (Blume) DC. -- not accepted -- Java waterdropwort
  Oenanthe javanica ssp. stolonifera (Wall. ex DC.) Murata -- not accepted -- stolon waterdropwort
  Oenanthe sarmentosa C. Presl ex DC. -- accepted -- water parsley
  Oenanthe stolonifera Wall. ex DC. -- not accepted
  Oldenlandia boscii (DC.) Chapm. -- accepted -- Bosc's mille graines
  Oldenlandia lancifolia (Schumach.) DC. -- accepted -- calycose mille graines
  Oldenlandia salzmannii (DC.) Benth. & Hook. f. ex B.D. Jacks. -- accepted -- Salzmann's mille graines
  Oldenlandia strigulosa Bartl. ex DC. -- accepted
  Oligoneuron X lutescens (Lindl. ex DC.) G.L. Nesom -- not accepted
  Oligotrichum Lam. & DC. -- accepted -- oligotrichum moss
  Oligotrichum hercynicum (Hedw.) Lam. & DC. -- accepted -- oligotrichum moss
  Omalotheca supina (L) DC -- accepted -- alpine arctic cudweed
  Onobrychis arenaria (Kit.) DC. -- accepted
  Onobrychis arenaria ssp. arenaria (Kit.) DC. -- accepted
  Onosmodium bejariense DC. ex A. DC. -- accepted -- soft-hair marbleseed
  Onosmodium bejariense var. bejariense DC. ex A. DC. -- accepted -- soft-hair marbleseed
  Onosmodium molle ssp. bejariense (DC. ex A. DC.) Cochrane -- not accepted -- softhair marbleseed
  Onosmodium molle var. bejariense (DC. ex A. DC.) Cronquist -- not accepted
  Onosmodium virginianum (L.) A. DC. -- accepted -- wild Job's tears
  Opuntia cylindrica (Lam.) DC. -- not accepted
  Opuntia imbricata (Haw.) DC. -- not accepted -- Cholla coyonoxtle, tree cholla, walkingstick cholla
  Opuntia imbricata var. imbricata (Haw.) DC. -- not accepted -- tree cholla, walkingstick cholla
  Opuntia kleiniae DC. -- not accepted -- candle cholla, Cholla tasajillo macho, Klein pencil cholla
  Opuntia leptocaulis DC. -- not accepted -- Cholla alfilerillo, Christmas cactus, tesajo cactus
  Opuntia leucotricha DC. -- accepted -- arborescent pricklypear, Nopal duraznillo
  Opuntia rosea DC. -- not accepted
  Opuntia rubescens Salm-Dyck ex DC. -- not accepted -- sour pricklypear
  Ornithogalum fistulosum Ramond ex DC. -- not accepted
  Ortholoma anisophyllum (DC.) Wiehler -- not accepted
  Osmorhiza aristata var. brevistylis (DC.) B. Boivin -- not accepted
  Osmorhiza berteroi DC. -- accepted -- mountain sweetroot, sweet cicely, sweetcicely
  Osmorhiza longistylis (Torr.) DC. -- accepted -- aniseroot, longstyle sweetroot
  Ossaea DC. -- accepted
  Ossaea scabrosa (L.) DC. -- not accepted -- sevennerve roughleaf
  Ossaea scalpta (Vent.) DC. -- not accepted -- threenerve roughleaf
  Osteospermum ecklonis (DC.) Norl. -- accepted -- blue and white daisybush
  Osteospermum muricatum E. Mey. ex DC. -- accepted
  Osteospermum sinuatum (DC.) Norl. -- accepted -- glandular cape marigold
  Ouratea ilicifolia (DC.) Baill. -- accepted -- chicharron amarillo
  Oxalis corymbosa DC. -- not accepted
  Oxalis debilis var. corymbosa (DC.) Lourteig -- accepted -- pink woodsorrel
  Oxydendrum DC. -- accepted -- sourwood, swamp cranberry
  Oxydendrum arboreum (L.) DC. -- accepted -- lily-of-the-valley tree, sorrel tree, sourwood
  Oxyspora DC. -- accepted
  Oxyspora paniculata (D. Don) DC. -- accepted -- bristletips
  Oxytropis DC. -- accepted -- crazyweed, locoweed
  Oxytropis borealis DC. -- accepted -- boreal locoweed, northern crazyweed
  Oxytropis borealis var. borealis DC. -- accepted -- boreal locoweed
  Oxytropis campestris (L.) DC. -- accepted -- field locoweed, northern yellow locoweed, white smallflower pointloco
  Oxytropis campestris var. campestris (L.) DC. -- accepted
  Oxytropis deflexa (Pall.) DC. -- not accepted
  Oxytropis deflexa (Pall.) DC. -- accepted -- drooping pointloco, hangpod crazyweed, nodding crazyweed, nodding locoweed, pendant-pod locoweed
  Oxytropis deflexa var. deflexa (Pall.) DC. -- accepted -- pendantpod locoweed
  Oxytropis nigrescens (Pall.) Fisch. ex DC. -- accepted -- blackish oxytrope
  Oxytropis nigrescens var. nigrescens (Pall.) Fisch. ex DC. -- accepted -- blackish locoweed, blackish oxytrope
  Pachira fastuosa (Moc. & Sessé ex DC.) Decne. -- not accepted
  Pachycereus marginatus (DC.) Britton & Rose -- accepted
  Pachypodium bispinosum A. DC. -- accepted
  Pachypodium succulentum (L. f.) A. DC. -- accepted
  Pachyrhizus Rich. ex DC. -- accepted
  Pachyrhizus angulatus Rich. ex DC. -- not accepted
  Packera subnuda (DC.) D.K. Trock & T.M. Barkley -- accepted -- Buek's groundsel
  Packera subnuda var. subnuda (DC.) D.K. Trock & T.M. Barkley -- accepted
  Packera tampicana (DC.) C. Jeffrey -- accepted -- Great Plains ragwort
  Palafoxia texana DC. -- accepted -- Texas palafox
  Palafoxia texana var. texana DC. -- not accepted -- Texas palafox
  Palafoxia tripteris (DC.) Shinners -- not accepted
  Palicourea alpina (Sw.) DC. -- accepted -- tafetan
  Palicourea barbinervia DC. -- not accepted
  Palicourea domingensis (Jacq.) DC. -- accepted
  Palicourea guianensis ssp. barbinervia (DC.) Steyerm. -- accepted -- showy cappel
  Papaver microcarpum auct. non DC. -- not accepted
  Papaver nudicaule var. radicatum (Rottb.) DC. -- not accepted
  Papaver somniferum var. setigerum auct. non (DC.) Corb. -- not accepted
  Paraboea cordata (A. DC.) Ridley -- not accepted
  Parasenecio auriculata (DC.) J.R. Grant -- accepted -- eared Indian plantain
  Parathesis (A. DC.) Hook. f. -- accepted
  Parkia timoriana (DC.) Merr. -- accepted
  Parmentiera DC. -- accepted
  Parmentiera edulis DC. -- not accepted
  Parnassia grandifolia DC. -- accepted -- largeleaf grass of Parnassus
  Parnassia palustris var. parviflora (DC.) B. Boivin -- not accepted -- smallflower grass of Parnassus
  Parnassia parviflora DC. -- accepted -- smallflower grass of Parnassus
  Parosela domingensis (DC.) Millsp. -- not accepted
  Parrotia persica (DC.) C.A. Mey. -- accepted -- Persian ironwood
  Paspalum ciliare (Retz.) DC. -- not accepted
  Paspalum dubium DC. -- not accepted
  Paspalum leptostachyum DC. -- not accepted
  Paspalum velutinum (DC.) Kunth -- not accepted
  Passiflora berteriana Balb. ex DC. -- not accepted
  Passiflora berteroana Balb. ex DC. -- accepted -- pasionaria de cercas
  Passiflora foetida var. hispida (DC. ex Triana & Planch.) Killip -- accepted -- scarletfruit passionflower
  Pavonia burchellii (DC.) R.A. Dyer -- accepted
  Pectis angustifolia var. tenella (DC.) Keil -- accepted -- lemonscent
  Pectis tenella DC. -- not accepted
  Pectocarya DC. ex Meisn. -- accepted -- combbur, combseed
  Pectocarya linearis (Ruiz & Pav.) DC. -- accepted -- sagebrush combseed
  Pectocarya penicillata (Hook. & Arn.) A. DC. -- accepted -- shortleaf combseed, sleeping combseed, winged combseed
  Pectocarya pusilla (A. DC.) A. Gray -- accepted -- little combseed, purple prairieclover
  Pediocactus conoideus (DC.) Halda -- not accepted
  Pellaea andromedifolia var. pubescens D.C. Eaton -- not accepted
  Pellaea andromedifolia var. rubens D.C. Eaton -- not accepted
  Pellaea breweri D.C. Eaton -- accepted -- Brewer's cliffbrake
  Pellaea macronata (D.C. Eaton) D.C. Eaton -- not accepted
  Pellaea mucronata (D.C. Eaton) D.C. Eaton -- accepted -- birdfoot cliffbrake
  Pellaea mucronata ssp. mucronata (D.C. Eaton) D.C. Eaton -- accepted -- birdfoot cliffbrake
  Pellaea mucronata var. mucronata (D.C. Eaton) D.C. Eaton -- not accepted -- bird's-foot fern
  Peltophorum pterocarpa (DC.) Backer ex K. Heyne -- not accepted -- yellow poinciana
  Peltophorum pterocarpum (DC.) Backer ex K. Heyne -- accepted
  Pentagramma triangularis ssp. viscosa (D.C. Eaton) Yatsk., Windham & E. Wollenw. -- accepted -- silverback fern
  Pentaraphia cuneifolia (DC.) Hanst. -- not accepted
  Pentaraphia pedunculosa (DC.) Decne. -- not accepted
  Pentaraphia sloanei (DC.) Hanst. -- not accepted
  Pentzia sphaerocephala DC. -- accepted
  Peperomia cookiana C. DC. -- accepted -- weakstem peperomia
  Peperomia cookiana var. flavinervia (C. DC.) Yunck. -- not accepted
  Peperomia cookiana var. ovatilimba (C. DC.) Yunck. -- not accepted
  Peperomia cookiana var. pukooana (C. DC.) Yunck. -- not accepted
  Peperomia cornifolia C. DC. -- not accepted
  Peperomia eekana C. DC. -- accepted -- Mt. Eke peperomia
  Peperomia ellipticibacca C. DC. -- accepted -- Koolau Range peperomia
  Peperomia emarginella (Sw. ex Wikstr.) C. DC. -- accepted -- Guadeloupe peperomia
  Peperomia erythroclada C. DC. -- not accepted
  Peperomia expallescens C. DC. -- accepted -- swamp peperomia
  Peperomia globulanthera C. DC. -- accepted -- puu kuhui
  Peperomia hawaiensis C. DC. -- not accepted
  Peperomia helleri C. DC. -- not accepted
  Peperomia helleri var. knudsenii (C. DC.) Yunck. -- not accepted
  Peperomia hirtipetiola C. DC. -- accepted -- forest peperomia
  Peperomia hirtipetiola var. longilimba (C. DC.) Yunck. -- not accepted
  Peperomia hypoleuca var. pluvigaudens (C. DC.) Yunck. -- not accepted
  Peperomia koolauana C. DC. -- not accepted
  Peperomia liliifolia C. DC. -- not accepted
  Peperomia liliifolia var. nudilimba (C. DC.) Yunck. -- not accepted
  Peperomia liliifolia var. psilostigma (C. DC.) Yunck. -- not accepted
  Peperomia macraeana C. DC. -- accepted -- pinninerve peperomia
  Peperomia mariannensis C. DC. -- accepted
  Peperomia maunakeana C. DC. -- not accepted
  Peperomia maxonii C. DC. -- not accepted -- Maxon's peperomia
  Peperomia oahuensis C. DC. -- accepted -- Oahu peperomia
  Peperomia obovatilimba C. DC. -- accepted -- graceful peperomia
  Peperomia remyi C. DC. -- accepted -- valley peperomia
  Peperomia rigidilimba C. DC. -- not accepted
  Peperomia rigidolimba C. DC. -- not accepted
  Peperomia rockii C. DC. -- accepted -- Kahuaha Forest peperomia
  Peperomia sintenisii C. DC. -- not accepted -- Sintenis' peperomia
  Peperomia tetraphylla var. parvifolia (C. DC.) O. Deg. & I. Deg. -- not accepted
  Peperomia trichostigma C. DC. -- not accepted
  Peperomia yabucoana Urb. & C. DC. -- accepted -- viper peperomia
  Peplis diandra Nutt. ex DC. -- not accepted
  Pereskia bleo (Kunth) DC. -- accepted
  Pereskia horrida (Kunth) DC. -- accepted
  Pereskia horrida ssp. horrida (Kunth) DC. -- accepted
  Pereskia lychnidiflora DC. -- accepted
  Pereskia portulacifolia (L.) DC. -- accepted
  Pereskia zinniiflora DC. -- accepted
  Pereskiopsis opuntiiflora (DC.) Britton & Rose -- not accepted
  Pereskiopsis rotundifolia (DC.) Britton & Rose -- accepted
  Perezia microcephala (DC.) A. Gray -- not accepted
  Pericallis cuneata (DC.) Webb & Bethel. non (Roth) Webb & Bethel. -- not accepted
  Perideridia americana (Nutt. ex DC.) Rchb. -- accepted -- eastern yampah, Osage perideridia
  Peritoma DC. -- accepted -- bee-plant
  Peritoma multicaulis (DC.) Iltis -- accepted -- slender spiderflower
  Peritoma serrulata (Pursh) DC. -- accepted -- Rocky Mountain beeplant
  Phaedranthus buccinatorius (DC.) Miers -- not accepted
  Phalaris cylindrica DC. -- not accepted
  Phalaris intermedia var. microstachya (DC.) Vasey ex L.H. Dewey -- not accepted
  Phalaris intermedia var. microstachya (DC.) Vasey -- not accepted
  Phalaris microstachya DC. -- not accepted
  Phaseolus atropurpureus DC. -- not accepted
  Philadelphus inodorus var. laxus (Schrad. ex DC.) S.Y. Hu -- not accepted
  Philadelphus latifolius Schrad. ex DC. -- not accepted
  Phleum bertolonii DC. -- not accepted -- diploid timothy
  Phleum pratense ssp. bertolonii (DC.) Bornm. -- accepted
  Phleum pratense var. bertolonii (DC.) Woods -- not accepted
  Phoradendron berterianum (DC.) Griseb. -- not accepted
  Phoradendron berteroanum (DC.) Griseb. -- accepted -- Bertero's mistletoe
  Phoradendron hexastichum (DC.) Griseb. -- accepted -- tropical mistletoe
  Phoradendron mucronatum (DC.) Krug & Urb. -- accepted -- needletip mistletoe
  Phoradendron serotinum ssp. tomentosum (DC.) Kuijt -- accepted -- Christmas mistletoe
  Phoradendron tomentosum (DC.) Engelm. ex A. Gray -- not accepted -- bigleaf mistletoe, Christmas mistletoe, downy mistletoe
  Phoradendron tomentosum var. tomentosum (DC.) Engelm. ex A. Gray -- not accepted
  Photinia villosa (Thunb.) DC. -- accepted -- oriental photinia, Oriental photinia
  Phymaspermum parvifolium (DC.) Benth. & Hook. f. -- accepted
  Picradenia odorata (DC.) Britton -- not accepted
  Pictetia DC. -- accepted
  Pieris phillyreifolia (Hook.) DC. -- accepted -- climbing fetterbush
  Pieris phyllyreifolia (Hook.) DC. -- not accepted
  Pilocereus strictus (DC.) Rümpler -- not accepted
  Pilosocereus monoclonos (DC.) Byles & G.D. Rowley -- not accepted
  Piper angustilimbum C. DC. -- accepted
  Piper glabrescens (Miq.) C. DC. -- accepted -- Guyanese pepper
  Piper guahamense C. DC. -- accepted
  Piper guayranum C. DC. -- not accepted
  Piper lambeauense C. DC. -- accepted
  Piper mornicola C. DC. -- accepted
  Piper officinarum (Miq.) C. DC. -- not accepted
  Piper ponapense C. DC. -- accepted -- pepper
  Piper saltuum C. DC. -- not accepted
  Piper swartzianum (Miq.) C. DC. -- accepted -- Spanish elder
  Piper trigonum C. DC. -- accepted
  Piper wydlerianum (Miq.) C. DC. -- not accepted
  Piriqueta caroliniana var. glabra (DC.) Urb. -- not accepted
  Pityrogramma triangularis var. viscosa (D.C. Eaton) Weath. -- not accepted
  Pityrogramma viscosa (D.C. Eaton) Maxon -- not accepted
  Plantago major ssp. intermedia (DC.) Arcang. -- not accepted
  Plantago major var. intermedia (DC.) Pilg. -- not accepted -- intermediate plantain
  Platycodon A. DC. -- accepted
  Platycodon grandiflorum (Jacq.) A. DC. -- not accepted -- balloon flower
  Platycodon grandiflorus (Jacq.) A. DC. -- accepted -- balloon-flower, Chinese-bellflower
  Plectritis (Lindl.) DC. -- accepted -- seablush
  Plectritis congesta (Lindl.) DC. -- accepted -- shortspur seablush
  Plectritis congesta ssp. congesta (Lindl.) DC. -- accepted -- shortspur seablush
  Plectritis samolifolia (DC.) Höck -- not accepted
  Pleioblastus auricomus (Mitford) D.C. McClint. -- not accepted
  Pleioblastus chrysanthus (Mitford ex Bean) D.C. McClint. -- accepted
  Pleiotaenia nuttallii (DC.) J.M. Coult. & Rose -- not accepted
  Pluchea camphorata (L) DC -- accepted -- camphor pluchea, camphor weed
  Pluchea cortesii (Kunth) DC. -- not accepted
  Pluchea foetida (L) DC -- accepted -- stinking camphorweed
  Pluchea foetida var. foetida (L) DC -- not accepted -- stinking camphorweed
  Pluchea purpurascens (Sw.) DC. -- not accepted
  Pluchea quitoc DC. -- not accepted
  Podospermum laciniatum (L) DC -- not accepted
  Pohlia camptotrachela var. bulbifera (Lam. & DC.) Wijk & Marg. -- not accepted
  Poitea paucifolia (DC.) Lavin -- accepted -- retama
  Polanisia dodecandra (L.) DC. -- accepted -- clammyweed, red-whisker clammyweed, redwhisker clammyweed, roughseed clammyweed
  Polanisia dodecandra ssp. dodecandra (L.) DC. -- accepted -- polanisie ŕ douze étamines sous-espčce ŕ douze étamines, red-whisker clammyweed, redwhisker clammyweed
  Polanisia uniglandulosa (Cav.) DC. -- accepted -- Mexican clammyweed
  Polanisia viscosa (L.) DC. -- not accepted
  Polycarpon alsinifolium (Biv.) DC. -- accepted -- fourleaf manyseed
  Polygala crotalarioides Buch.-Ham. ex DC. -- accepted
  Polygala crucianelloides DC. -- accepted -- Caribbean milkwort
  Polygala nana (Michx.) DC. -- accepted -- candyroot
  Polypodium californicum var. kaulfussii D.C. Eaton -- not accepted
  Polypodium glycyrrhiza D.C. Eaton -- accepted -- licorice fern
  Polystichum californicum (D.C. Eaton) Diels -- accepted -- California swordfern
  Polystichum imbricans (D.C. Eaton) D.H. Wagner -- accepted -- narrowleaf swordfern
  Polystichum imbricans ssp. imbricans (D.C. Eaton) D.H. Wagner -- accepted -- narrowleaf swordfern
  Polystichum mohrioides var. scopulinum (D.C. Eaton) Fernald -- not accepted
  Polystichum munitum ssp. imbricans (D.C. Eaton) Munz -- not accepted
  Polystichum munitum ssp. nudatum (D.C. Eaton) Ewan -- not accepted
  Polystichum munitum var. imbricans (D.C. Eaton) Maxon -- not accepted
  Polystichum munitum var. incisoserratum (D.C. Eaton) Underw. -- not accepted
  Polystichum scopulinum (D.C. Eaton) Maxon -- accepted -- Eaton's hollyfern, mountain hollyfern, polystic des rochers
  Polytaenia DC. -- accepted -- hairy moss
  Polytaenia nuttallii DC. -- accepted -- Nuttall's prairie parsley, prairie parsley
  Poponax macracanthoides (Bertero ex DC.) Britton & Rose -- not accepted
  Porophyllum macrocephalum DC. -- not accepted
  Porophyllum ruderale ssp. macrocephalum (DC.) R.R. Johnson -- accepted -- yerba porosa
  Porophyllum ruderale var. macrocephalum (DC.) Cronquist -- not accepted
  Potentilla recta var. sulphurea (Lam. & DC.) Peyr. -- not accepted
  Pouteria multiflora (A. DC.) Eyma -- accepted -- bullytree
  Prenanthes boottii (DC.) A. Gray -- accepted -- alpine rattlesnakeroot
  Prestonia exserta (A. DC.) Standl. -- accepted
  Prosopis juliflora auct. non (Sw.) DC. -- not accepted
  Prosopis juliflora (Sw.) DC. -- accepted -- mesquite
  Prosopis juliflora var. juliflora (Sw.) DC. -- not accepted -- mesquite
  Prosopis torquata (Cav. ex Lag.) DC. -- accepted -- mesquite
  Prunella vulgaris var. parviflora (Poir.) DC. -- not accepted
  Prunus dulcis var. amara (DC.) Buchheim -- not accepted
  Pseudognaphalium attenuatum (DC.) Anderb. -- accepted -- tapered cudweed
  Pseudognaphalium brachypterum (DC.) Anderb. -- accepted
  Pseudognaphalium californicum (DC.) Anderb. -- accepted -- ladies' tobacco
  Pseudognaphalium canescens (DC.) W.A. Weber -- accepted -- pseudognaphalium, Wright's cudweed
  Pseudognaphalium canescens ssp. canescens (DC.) W.A. Weber -- accepted -- cudweed, everlasting, Wright's cudweed
  Psilocarphus tenellus var. globiferus (Bertero ex DC.) Morefield -- not accepted -- slender woollyheads
  Psilostrophe DC. -- accepted -- paperflower
  Psilostrophe gnaphaliodes DC. -- not accepted
  Psilostrophe gnaphalioides DC. -- accepted -- cudweed paperflower, dudweed
  Psophocarpus Neck. ex DC. -- accepted
  Psophocarpus tetragonolobus (L.) DC. -- accepted -- winged bean
  Psoralea dentata DC. -- not accepted
  Psoralea macrostachya DC. -- not accepted
  Psychotria berteriana DC. -- not accepted -- cachimbo-cumun
  Psychotria berteroana DC. -- accepted
  Psychotria deflexa DC. -- accepted -- nodding wild coffee
  Psychotria guadalupensis (DC.) Howard -- not accepted -- Guadalupe wild coffee
  Psychotria guadalupensis ssp. guadalupensis (DC.) Howard -- not accepted -- Guadalupe wild coffee
  Psychotria microdon (DC.) Urb. -- not accepted -- thicket wild coffee
  Psychotria portoricensis DC. -- not accepted
  Psychotria revoluta DC. -- accepted -- curl-leaf wild coffee
  Psychrophila leptosepala (DC.) W.A. Weber -- not accepted
  Pterocarya stenoptera C. DC. -- accepted -- Chinese wingnut
  Pterocaulon alopecuroideum (Lam.) DC. -- not accepted
  Pterocaulon alopecuroidies (Lam.) DC. -- accepted -- fox-tail blackroot
  Pterocaulon virgatum (L) DC -- accepted -- wand blackroot
  Pterolepis (DC.) Miq. -- accepted -- meadowbeauty
  Ptilimnium nuttallii (DC.) Britton -- accepted -- laceflower, Nuttall's mockbishopweed
  Pueraria DC. -- accepted -- kudzu
  Pulsatilla nuttalliana (DC.) Spreng. -- not accepted
  Purshia DC. ex Poir. -- accepted -- bitterbrush, cliffrose
  Purshia tridentata (Pursh) DC. -- accepted -- antelope bitterbrush
  Purshia tridentata var. tridentata (Pursh) DC. -- accepted -- antelope bush
  Putoria calabrica DC. -- not accepted
  Pyrola asarifolia var. incarnata (DC.) Fernald -- not accepted
  Pyrrhopappus DC. -- accepted -- desert chicory, desert-chicory, desertchicory
  Pyrrhopappus carolinianus (Walter) DC. -- accepted -- Carolina desert chicory, Carolina desert-chicory, Carolina false dandelion, Carolina false-dandelion
  Pyrrhopappus carolinianus var. carolinianus (Walter) DC. -- not accepted -- Carolina desertchicory
  Pyrrhopappus multicaulis DC. -- not accepted
  Pyrrhopappus multicaulis var. multicaulis DC. -- not accepted -- desertchicory
  Pyrrhopappus pauciflorus (D. Don) DC. -- accepted -- desert chicory, desertchicory, manystemmed false-dandelion, smallflower desert-chicory
  Pyrrhopappus scaposus DC. -- not accepted
  Pyrus americana (Marshall) DC. -- not accepted
  Pyrus salviifolia DC. -- not accepted
  Pyrus sativa DC. -- not accepted
  Quadrella (DC.) J. Presl -- accepted
  Quercus novomexicana (A. DC.) Rydb. -- not accepted
  Quercus utahensis (A. DC.) Rydb. -- not accepted
  Quercus wislizeni A. DC. -- accepted -- interior live oak
  Quercus wislizeni var. wislizeni A. DC. -- not accepted -- interior live oak
  Quercus wislizenii A. DC. -- not accepted -- interior live oak
  Quercus wislizenii var. wislizenii A. DC. -- not accepted
  Quercus X runcinata (A. DC.) Engelm. -- accepted -- oak
  Quercus X tridentata (Engelm. ex A. DC.) Trel. (pro sp.) -- accepted -- tridentata oak
  Quintilia caerulea (Blume) DC. -- not accepted
  Railliardia ciliolata DC. -- not accepted
  Ramonda scapigera DC. -- not accepted
  Ranunculus aquatilis var. capillaceus (Thuill.) DC. -- not accepted
  Ranunculus arvensis var. tuberculatus (DC.) Koch -- not accepted
  Ranunculus carolinianus DC. -- not accepted
  Ranunculus gmelini DC. -- not accepted
  Ranunculus gmelini var. gmelini DC. -- not accepted
  Ranunculus gmelinii DC. -- accepted -- Gmelin's buttercup, lesser yellow water buttercup, small yellow water buttercup
  Ranunculus gmelinii var. gmelinii DC. -- not accepted -- Gmelin's buttercup
  Ranunculus kamchaticus DC. -- accepted -- Kamchatka buttercup
  Ranunculus kamtschaticus DC. -- not accepted
  Ranunculus nelsonii (DC.) A. Gray -- not accepted
  Ranunculus occidentalis ssp. nelsonii (DC.) Hultén -- not accepted
  Ranunculus occidentalis var. nelsonii (DC.) L.D. Benson -- accepted -- Nelson's buttercup
  Ranunculus petiolaris Kunth ex DC. -- accepted -- Latin American buttercup
  Ranunculus petiolaris var. petiolaris Kunth ex DC. -- not accepted
  Ranunculus plebeius R. Br. ex DC. -- accepted -- common Australian buttercup
  Ranunculus recurvatus var. nelsonii DC. -- not accepted
  Ranunculus repens var. erectus DC. -- not accepted
  Ranunculus repens var. glabratus DC. -- not accepted -- creeping buttercup
  Ranunculus repens var. linearilobus DC. -- not accepted
  Ranunculus reptans var. filiformis (Michx.) DC. -- not accepted
  Rapistrum rugosum var. venosum (Pers.) DC. -- not accepted -- annual bastardcabbage
  Ratibida columnaris var. pulcherrima (DC.) D. Don -- not accepted
  Ratonia domingensis DC. -- not accepted
  Rauvolfia lamarckii A. DC. -- not accepted
  Rauvolfia sandwicensis A. DC. -- accepted -- devil's-pepper
  Rauvolfia sandwicensis var. sandwicensis A. DC. -- not accepted -- hao
  Rayjacksonia phyllocephala (DC.) R.L. Hartm. & M.A. Lane -- accepted -- camphor daisy
  Rechsteineria polyantha (DC.) Kuntze -- not accepted
  Rechsteineria vargasii (DC.) Kuntze -- not accepted
  Rechsteineria vauthieri (DC.) Kuntze -- not accepted
  Rhabdadenia sagraei (A. DC.) Müll. Arg. -- not accepted
  Rhamnus purshiana DC. -- accepted -- Cascara buckthorn, Pursh's buckthorn
  Rhipsalis baccifera ssp. mauritiana (DC.) Barthlott -- accepted
  Rhipsalis micrantha DC. -- accepted
  Rhodocactus lychnidiflorus (DC.) F.M. Knuth -- not accepted
  Rhodocactus zinniiflorus (DC.) F.M. Knuth -- not accepted
  Rhodomyrtus (DC.) Rchb. -- accepted
  Rhus copallina var. leucantha (Jacq.) DC. -- not accepted -- southern sumac
  Rhus copallinum var. leucantha (Jacq.) DC. -- not accepted -- shining sumac, winged sumac
  Rhus radicans var. vulgaris (Michx.) DC. -- not accepted
  Rhus vernicifera DC. -- not accepted
  Rhynchoglossum blumei A. DC. -- not accepted
  Rhynchoglossum obliquum (Wall.) A. DC. -- not accepted
  Rhynchoglossum obliquum var. intermedium (Benth.) DC. -- not accepted
  Rhynchoglossum rheedei A. DC. -- not accepted
  Rhynchosia caribaea (Jacq.) DC. -- accepted -- Caribbean snoutbean
  Rhynchosia densiflora (Roth) DC. -- accepted
  Rhynchosia densiflora ssp. chrysadenia (Taub.) Verdc. -- accepted
  Rhynchosia difformis (Elliott) DC. -- accepted -- doubleform snoutbean
  Rhynchosia erecta (Walter) DC. -- not accepted
  Rhynchosia minima (L.) DC. -- accepted -- least snoutbean
  Rhynchosia parvifolia DC. -- accepted -- small-leaf snoutbean
  Rhynchosia phaseoloides (Sw.) DC. -- accepted -- crabseye
  Rhynchosia precatoria DC. -- accepted -- rosary snoutbean
  Rhynchosia reniformis DC. -- accepted -- dollarleaf
  Rhynchosia reticulata (Sw.) DC. -- accepted -- habilla
  Rhynchosia totta (Thunb.) DC. -- accepted -- snoutbean
  Rhynchotechum ellipticum (Wall. ex Dietrich) A. DC. -- accepted
  Rhynchotechum ellipticum var. ellipticum (Wall. ex Dietrich) A. DC. -- accepted
  Rhytidophyllum auriculatum var. plumerianum (DC.) Urb. -- not accepted
  Rhytidophyllum crenulatum DC. -- accepted
  Rhytidophyllum petiolare DC. -- accepted
  Rhytidophyllum plumerianum DC. -- not accepted
  Ribes aureum var. villosum DC. -- accepted -- clove currant, golden currant
  Ribes uva-crispa var. sativum DC. -- not accepted -- European gooseberry
  Riedlea hirsuta (Cav.) DC. -- not accepted
  Riocreuxia chrysochroma (H. Huber) Radcl.-Sm. -- accepted
  Robinia hispida var. nana (Elliott) DC. -- accepted -- bristly locust
  Rochefortia acanthophora (DC.) Griseb. -- accepted -- greenheart ebony
  Roemeria refracta DC. -- accepted -- spotted Asian poppy
  Roettlera mollis (Wall. ex A. DC.) Kuntze -- not accepted
  Rollinia orthopetala A. DC. -- not accepted
  Rollinia pulchrinervia A. DC. -- not accepted
  Rollinia pulchrinervis A. DC. -- not accepted -- biriba
  Rondeletia microdon DC. -- not accepted
  Rorippa barbareifolia (DC.) Kitag. -- accepted -- hoary yellowcress
  Rorippa hispida var. barbareifolia (DC.) Hultén -- not accepted
  Rorippa islandica var. barbareifolia (DC.) S.L. Welsh -- not accepted
  Rorippa microsperma (DC.) L.H. Bailey -- not accepted
  Rorippa sarmentosa (G. Forst. ex DC.) J.F. Macbr. -- accepted -- longrunner
  Rosa myriacantha DC. -- not accepted
  Rosa nivea DC. -- not accepted
  Rubia walteri DC. -- not accepted
  Rubus canescens DC. -- accepted
  Rudbeckia glabra DC. -- not accepted
  Rudbeckia grandiflora (D. Don) J.F. Gmel. ex DC. -- accepted -- rough coneflower
  Rudbeckia grandiflora var. grandiflora (D. Don) J.F. Gmel. ex DC. -- accepted -- rough coneflower
  Rumex cristatus DC. -- accepted -- Greek dock
  Rumex longifolius DC. -- accepted -- door-yard dock, dooryard dock
  Saba senegalensis (A. DC.) Pichon -- accepted -- Senegal saba
  Sabinea DC. -- not accepted
  Sabinea florida (Vahl) DC. -- not accepted -- wattapama
  Sagraea DC. -- accepted -- hogwood
  Sagraea domingensis DC. -- not accepted -- woodland hogwood
  Sagraea umbrosa (Sw.) DC. -- not accepted -- white hogwood
  Sairocarpus coulterianus (Benth. ex A. DC.) D.A. Sutton -- accepted -- Coulter's snapdragon
  Sairocarpus nuttallianus (Benth. ex A. DC.) D.A. Sutton -- accepted -- violet snapdragon, violet toad's-mouth
  Salmalia malabarica (DC.) Schott & Endl. -- not accepted
  Salmea DC. -- accepted -- bejuco de miel
  Salmea scandens (L) DC -- accepted -- bejuco de miel
  Salomonia ciliata (L.) DC. -- accepted
  Salpiglossis erecta (DC.) D'Arcy -- not accepted
  Sambucus caerulea var. mexicana (C. Presl ex DC.) L.D. Benson -- not accepted
  Sambucus cerulea var. mexicana (C. Presl ex DC.) L.D. Benson -- not accepted
  Sambucus mexicana C. Presl ex DC. -- not accepted -- Mexican elder
  Sambucus racemosa var. laciniata W.D.J. Koch ex DC. -- not accepted
  Sanicula crassicaulis Poepp. ex DC. -- accepted -- Pacific blacksnakeroot
  Sanicula crassicaulis var. crassicaulis Poepp. ex DC. -- accepted -- Pacific blacksnakeroot
  Sanicula graveolens Poepp. ex DC. -- accepted -- northern sanicle, Sierra sanicle
  Sanvitalia ocymoides DC. -- accepted -- yellow creeping zinnia
  Sarracenia flava var. rugelii (Shuttlew. ex A. DC.) Mast. -- accepted
  Saussurea DC. -- accepted -- saw-wort
  Saussurea alpina (L) DC -- not accepted -- alpine sawwort
  Saussurea amara (L) DC -- accepted -- saussurea
  Saussurea amara var. amara (L) DC -- accepted
  Saussurea americana D.C. Eaton -- accepted -- American saw-wort
  Saussurea angustifolia (Willd.) DC. -- accepted -- narrowleaf saw-wort
  Saussurea angustifolia var. angustifolia (Willd.) DC. -- accepted -- narrowleaf saw-wort
  Schinziophyton Hutch. ex Radcl.-Sm. -- accepted
  Schinziophyton rautanenii (Schinz) Radcl.-Sm. -- accepted -- manketti
  Schivereckia Andrz. ex DC. -- accepted
  Schkuhria anthemoidea (DC.) J.M. Coult. -- not accepted -- Wright's false threadleaf
  Schkuhria anthemoidea var. anthemoidea (DC.) J.M. Coult. -- not accepted -- Wright's false threadleaf
  Schrankia leptocarpa DC. -- not accepted
  Schrankia nuttallii (DC. ex Britton & Rose) Standl. -- not accepted
  Schrankia nuttallii var. nuttallii (DC. ex Britton & Rose) Standl. -- not accepted -- Nuttall's sensitive briar
  Securigera DC. -- accepted
  Sedum anopetalum DC. -- not accepted
  Sedum dendroideum Moceno & Sessé ex A. DC. -- accepted -- tree stonecrop
  Sedum praealtum DC. -- accepted -- green cockscomb
  Selaginella mutica D.C. Eaton ex Underw. -- accepted -- bluntleaf spikemoss
  Selaginella mutica var. mutica D.C. Eaton ex Underw. -- accepted -- bluntleaf spikemoss
  Selaginella oregana D.C. Eaton -- accepted -- Oregon spikemoss
  Selenicereus extensus (Salm-Dyck ex DC.) Leuenb. -- not accepted
  Selenicereus setaceus (Salm-Dyck ex DC.) Werderm. -- not accepted
  Selenicereus spinulosus (DC.) Britton & Rose -- accepted -- nightblooming cereus, Pitayita-nocturna espinosa, vinelike moonlight cactus
  Senecio aronicoides DC. -- accepted -- rayless ragwort
  Senecio bicolor ssp. cineraria (DC.) Chater -- not accepted -- silver ragwort
  Senecio californicus DC. -- accepted -- California ragwort
  Senecio cineraria DC. -- not accepted
  Senecio congestus (R. Br.) DC. -- not accepted -- clustered marsh ragwort, marsh fleabane
  Senecio cruentus DC. -- not accepted
  Senecio douglasii DC. -- not accepted
  Senecio flaccidus var. douglasii (DC.) B.L. Turner & T.M. Barkley -- accepted -- Douglas' groundsel, Douglas' ragwort, Douglas' senecio
  Senecio flocciferus DC. -- not accepted
  Senecio lucidus (Sw.) DC. -- not accepted
  Senecio petasitis (Sims) DC. -- not accepted
  Senecio salignus DC. -- not accepted -- willow ragwort
  Senecio silignus DC. -- not accepted
  Senecio subnudus DC. -- not accepted
  Senecio tampicanus DC. -- not accepted -- Great Plains ragwort
  Senegalia westiana (DC.) Britton & Rose -- not accepted
  Senna artemisioides (Gaudich. ex DC.) Randell -- accepted -- silver senna
  Senna glutinosa (DC.) Randell -- accepted
  Senna macranthera (DC. ex Collad.) H.S. Irwin & Barneby -- accepted
  Senna spectabilis (DC.) H.S. Irwin & Barneby -- accepted -- casia amarilla
  Senna spectabilis var. spectabilis (DC.) H.S. Irwin & Barneby -- not accepted -- casia amarilla
  Senna sulfurea (DC. ex Collad.) H.S. Irwin & Barneby -- not accepted -- smooth senna
  Senna surattensis ssp. sulfurea (DC. ex Collad.) Randell -- accepted -- smooth senna
  Sida acuminata DC. -- not accepted
  Sidalcea malviflora (DC.) A. Gray ex Benth. -- accepted -- dwarf checkerbloom
  Sidalcea malviflora ssp. malviflora (DC.) A. Gray ex Benth. -- accepted -- dwarf checkerbloom
  Sidastrum acuminatum (DC.) Fryxell -- not accepted
  Silene acaulis var. exscapa (All.) DC. -- not accepted -- moss campion
  Silene coniflora Nees ex DC. -- accepted -- manynerve catchfly
  Silphium asteriscus var. laevicaule DC. -- not accepted -- starry rosinweed
  Simarouba glauca DC. -- accepted -- bitter ash, bitter damson, bitterwood, paradise tree, paradise-tree, paradisetree
  Simsia lagasceiformis DC. -- accepted -- annual bush sunflower, annual bushsunflower
  Sinningia polyantha (DC.) Wiehler -- not accepted
  Sisymbrium officinale var. leiocarpum DC. -- not accepted -- hedge mustard, hedgeweed
  Sitilias multicaulis (DC.) Greene -- not accepted
  Sloanea berteriana Choisy ex DC. -- not accepted -- bullwood
  Sloanea berteroana Choisy ex DC. -- accepted -- bullwood
  Smilax bona-nox var. hastata (Willd.) A. DC. -- not accepted
  Smilax californica (A. DC.) A. Gray -- accepted -- California greenbrier
  Smilax herbacea var. lasioneura (Hook.) A. DC. -- not accepted
  Solanum boldoense Dunal & A. DC. -- accepted
  Solidago canadensis var. lepida (DC.) Cronquist -- not accepted -- Canada goldenrod
  Solidago canadensis var. subserrata (DC.) Cronquist -- not accepted
  Solidago decemflora DC. -- not accepted
  Solidago leiocarpa DC. in DC. & A. DC. -- accepted -- Cutler's alpine goldenrod
  Solidago lepida DC. -- accepted -- Canada goldenrod
  Solidago lepida ssp. lepida DC. -- accepted
  Solidago lepida var. lepida DC. -- accepted -- Canada goldenrod
  Solidago multiradiata var. arctica (DC.) Fernald -- not accepted -- arctic goldenrod
  Solidago nemoralis ssp. decemflora (DC.) Brammall -- accepted -- gray goldenrod
  Solidago nemoralis var. decemflora (DC.) Fernald -- not accepted
  Solidago rotundifolia DC. -- not accepted
  Solidago simplex ssp. simplex var. spathulata (DC.) Cronquist -- not accepted
  Solidago simplex var. spathulata (DC.) Cronq. -- not accepted -- Mt. Albert goldenrod
  Solidago spathulata DC. -- accepted -- coast goldenrod, Mt. Albert goldenrod
  Solidago spathulata ssp. spathulata DC. -- not accepted
  Solidago spathulata var. spathulata DC. -- not accepted -- coastaldune goldenrod
  Solidago spectabilis (D.C. Eaton) A. Gray -- accepted -- Nevada goldenrod
  Solidago spectabilis var. spectabilis (D.C. Eaton) A. Gray -- accepted -- Nevada goldenrod
  Solidago uniligulata (DC.) Porter -- not accepted
  Solidago velutina DC. -- accepted -- sparse goldenrod, three-nerve goldenrod, threenerve goldenrod
  Solidago velutina ssp. velutina DC. -- accepted
  Solidago virgauera var. arctica DC. -- not accepted
  Solidago X lutescens (Lindl. ex DC.) B. Boivin -- accepted
  Soliva nasturtiifolia auct. non (Juss.) DC. -- not accepted
  Sophora secundiflora (Ortega) Lag. ex DC. -- not accepted -- mescal bean, mescalbean
  Sophora secuniflora (Ortega) Lag. ex DC. -- not accepted
  Sorghum saccharoides var. laguroides (DC.) Kuntze -- not accepted
  Specularia perfoliata (L.) A. DC. -- not accepted
  Spergularia marginata (DC.) Kitt. -- not accepted
  Spermacoce densiflora (DC.) Alain -- accepted -- bouquet false buttonweed
  Spermacoce repens auct. non (DC.) Sessé & Moc. -- not accepted -- creeping false buttonweed
  Spermolepis echinata (Nutt. ex DC.) A. Heller -- accepted -- bristly scaleseed, bristly-fruit scaleseed
  Spermolepis inermis (Nutt. ex DC.) Mathias & Constance -- accepted -- Red River scaleseed
  Spermolepis patens (Nutt. ex DC.) B.L. Rob. -- not accepted
  Sphaeromeria cana (D.C. Eaton) A. Heller -- accepted -- gray chickensage, gray tansey
  Sphaeromeria diversifolia (D.C. Eaton) Rydb. -- accepted -- separateleaf chickensage
  Sphaerophysa DC. -- accepted
  Sphaerophysa salsula (Pall.) DC. -- accepted -- alkali swainsonpea, Austrian peaweed, red bladder-vetch, Swainsonpea
  Sphagnum compactum DC. in Lam. & DC. -- accepted -- low sphagnum
  Sphenoclea pongatium DC. -- not accepted
  Spigelia gentianoides Chapm. ex A. DC. -- accepted -- gentian pinkroot, purple flower pink root, purpleflower pinkroot
  Spigelia gentianoides var. gentianoides Chapm. ex A. DC. -- accepted -- purpleflower pinkroot
  Spigelia hedyotidea A. DC. -- accepted -- prairie pinkroot
  Spigelia loganioides (Torr. & A. Gray ex Endl. & Fenzl) A. DC. -- accepted -- Florida pinkroot
  Spigelia texana (Torr. & A. Gray) A. DC. -- accepted -- Texas pinkroot
  Spilanthes americana var. stolonifera (DC.) A.H. Moore -- not accepted
  Spilanthes stolonifera DC. -- not accepted
  Stenactis strigosa (Muhl. ex Willd.) DC. -- not accepted
  Stenocactus crispatus (DC.) A. Berger -- accepted
  Stenocactus obvallatus (DC.) A. Berger -- accepted
  Stenocereus marginatus (DC.) A. Berger & Buxb. -- not accepted
  Stenostomum acutatum DC. -- accepted
  Stenotopsis linearifolia (DC.) Rydb. -- not accepted
  Stenotus acaulis var. glabratus (D.C. Eaton) Kartesz & Gandhi -- not accepted -- stemless mock goldenweed
  Stephanomeria exigua ssp. pentachaeta D.C. Eaton -- not accepted
  Stephanomeria exigua var. pentachaeta (D.C. Eaton) H.M. Hall -- not accepted
  Stephanomeria minor var. myrioclada (D.C. Eaton) Kartesz -- not accepted -- narrowleaf wirelettuce
  Stephanomeria myrioclada D.C. Eaton -- not accepted
  Stephanomeria tenuifolia var. myrioclada (D.C. Eaton) Cronquist -- not accepted -- narrowleaf wirelettuce
  Stigmaphyllon floribundum (DC.) C.E. Anderson -- accepted -- woolly Amazonvine
  Stigmaphyllon periplocifolium (Desf. ex DC.) A. Juss. -- not accepted
  Streptocarpus angovensis DC. -- not accepted
  Streptopus amplexifolius (L.) DC. -- accepted -- clasping twistedstalk, claspleaf twistedstalk, twisted stalk
  Streptopus amplexifolius var. amplexifolius (L.) DC. -- not accepted -- American twistedstalk, claspleaf twistedstalk
  Strombocactus disciformis (DC.) Britton & Rose -- accepted
  Strombocactus disciformis ssp. disciformis (DC.) Britton & Rose -- accepted
  Strophanthus DC. -- accepted
  Strophanthus hispidus DC. -- accepted -- hispid strophanthus
  Strophanthus sarmentosus DC. -- accepted
  Stylogyne A. DC. -- accepted
  Sutherlandia microphylla Burch. ex DC. -- not accepted
  Symphyotrichum foliaceum (Lindl. ex DC.) G.L. Nesom -- accepted -- alpine leafybract aster
  Symphyotrichum foliaceum var. foliaceum (Lindl. ex DC.) G.L. Nesom -- accepted -- alpine leafybract aster
  Symphyotrichum foliaceum var. parryi (D.C. Eaton) G.L. Nesom -- accepted -- Parry's aster
  Symphyotrichum lateriflorum var. hirsuticaule (Lindl. ex DC.) G.L. Nesom -- not accepted -- calico aster
  Symphyotrichum patens var. patentissimum (Lindl. ex DC.) G.L. Nesom -- accepted -- late purple aster
  Symphyotrichum retroflexum (Lindl. ex DC.) G.L. Nesom -- accepted -- rigid whitetop aster
  Synsepalum (A. DC.) Daniell -- accepted
  Syntherisma velutina (DC.) Chase -- not accepted
  Syntherisma velutina ssp. velutina (DC.) Chase -- not accepted
  Syzygium jambolanum (Lam.) DC. -- not accepted
  Syzygium racemosum (Blume) DC. -- accepted
  Tabebuia Gomes ex DC. -- accepted -- trumpet-tree
  Tabebuia haemantha (Bertol. ex Spreng.) DC. -- accepted -- roble cimarron
  Tabebuia heterophylla (DC.) Britton -- accepted -- white cedar
  Tabebuia pentaphylla (DC.) Hemsl. -- not accepted
  Tabebuia rosea (Bertol.) DC. -- accepted -- pink poui, pink trumpet-tree
  Tabebuia triphylla DC. -- not accepted
  Tamarix parviflora DC. -- accepted -- saltcedar, small-flower tamarisk, smallflower tamarisk, tamarisk, tamarix
  Tamaulipa azurea (DC.) King & H. Rob. -- accepted -- blue boneset
  Tanacetum boreale Fisch. ex DC. -- not accepted
  Tanacetum canum D.C. Eaton -- not accepted
  Tanacetum diversifolium D.C. Eaton -- not accepted
  Tanacetum douglasi DC. -- not accepted
  Tanacetum douglasii DC. -- not accepted
  Tanacetum vulgare var. crispum DC. -- not accepted
  Taonabo peduncularis (DC.) Britton -- not accepted
  Tapeinotes barbata (Nees & Mart.) DC. -- not accepted
  Tapeinotes pusilla (Mart.) DC. -- not accepted
  Taraxacum ceratophorum (Ledeb.) DC. -- accepted -- common dandelion, woolbearing dandelion
  Taraxacum glabra DC. -- not accepted
  Taraxacum glabrum DC. -- accepted
  Taraxacum laevigatum (Willd.) DC. -- not accepted -- red-seed dandelion, rock dandelion
  Taraxacum latilobum DC. -- accepted -- broad-lobe dandelion
  Taraxacum lyratum (Ledeb.) DC. -- not accepted -- alpine dandelion, harp dandelion, rock dandelion
  Tecoma gaudichaudii DC. -- not accepted
  Tephrosia candida DC. -- accepted -- white hoarypea
  Tephrosia caribaea (Jacq.) DC. -- not accepted
  Terminalia sericea Burch. ex DC. -- accepted -- clusterleaf
  Ternstroemia peduncularis DC. -- accepted -- copey vera
  Tetradymia DC. -- accepted -- horsebrush, tetradymia
  Tetradymia canescens DC. -- accepted -- gray horsebrush, spineless horsebrush
  Tetraneuris scaposa (DC.) Greene -- accepted -- stemmy four-nerve daisy
  Tetraneuris scaposa var. scaposa (DC.) Greene -- accepted -- stemmy four-nerve daisy, villous four-nerve daisy
  Tetrazygia Rich. ex DC. -- accepted -- clover ash
  Tetrazygia angustifolia (Sw.) DC. -- accepted -- stinkingfish
  Tetrazygia crotonifolia (Desr.) DC. -- accepted -- hillside clover ash
  Tetrazygia elaeagnoides (Sw.) DC. -- accepted -- krekre
  Thalictrum clavatum DC. -- accepted -- mountain meadow-rue
  Thalictrum revolutum DC. -- accepted -- waxyleaf meadow-rue, waxyleaf meadowrue
  Thelypteris boydiae (D.C. Eaton) K. Iwats. -- not accepted -- Boyd's maiden fern
  Theobroma angustifolium Moc. & Sessé ex DC. -- accepted -- theobroma
  Thespesia grandiflora DC. -- accepted -- maga
  Thlaspi cochleariforme DC. -- not accepted
  Thymophylla acerosa (DC.) Strother -- accepted -- prickleaf dogweed, pricklyleaf dogweed, Texas dogweed
  Thymophylla micropoides (DC.) Strother -- accepted -- woolly pricklyleaf
  Thymophylla pentachaeta (DC.) Small -- accepted -- five-needle pricklyleaf, fiveneedle pricklyleaf
  Thymophylla pentachaeta var. belenidium (DC.) Strother -- accepted -- firehair dogweed, fiveneedle pricklyleaf
  Thymophylla pentachaeta var. pentachaeta (DC.) Small -- accepted -- common dogweed, fiveneedle pricklyleaf
  Thymophylla tenuiloba (DC.) Small -- accepted -- bristleleaf pricklyleaf
  Thymophylla tenuiloba var. tenuiloba (DC.) Small -- accepted -- bristleleaf pricklyleaf
  Tibouchina herbacea (DC.) Cogn. -- accepted -- cane ti, glorybush, herbaceous glorytree
  Tibouchina semidecandra (Schrank & Mart. ex DC.) Cogn. -- accepted -- purple glory tree
  Tibouchina urvilleana (DC.) Cogn. -- accepted -- glorybush, lasiandra, princess-flower, princessflower
  Tigridia pavonia (L. f.) DC. -- accepted
  Tilia argentea DC. -- not accepted
  Tilia petiolaris DC. -- accepted -- pendent silver linden
  Tilia tomentosa ssp. petiolaris (DC.) Soó -- not accepted
  Timonius DC. -- accepted
  Timonius nitidus (Bartlett ex DC.) Fern.-Vill. -- accepted
  Tiquilia canescens (DC.) A.T. Richardson -- accepted -- ratear coldenia, woody crinklemat
  Tiquilia canescens var. canescens (DC.) A.T. Richardson -- accepted -- crinklemat, gray coldenia, gray tiquilia, ratear coldenia, woody crinklemat
  Tithonia argophylla D.C. Eaton -- not accepted
  Tithymalus flavicomus (DC.) Bubani -- not accepted
  Tithymalus rhabdotospermus (Radcl.-Sm.) Holub -- not accepted
  Tithymalus saxicola (Radcl.-Sm.) Soják -- not accepted
  Tonestus kingii (D.C. Eaton) G.L. Nesom -- not accepted -- King's serpentweed
  Tonestus kingii var. kingii (D.C. Eaton) G.L. Nesom -- not accepted -- King's serpentweed
  Torilis japonica (Houtt.) DC. -- accepted -- erect hedgeparsley
  Torilis scabra (Thunb.) DC. -- accepted -- rough hedgeparsley
  Tournefortia caribaea (A. DC.) Griseb. -- accepted
  Townsendia parryi D.C. Eaton -- accepted -- Parry's Townsend daisy, Parry's townsendia
  Townsendia scapigera D.C. Eaton -- accepted -- ground townsendia, tufted Townsend daisy
  Trachynotia alterniflora (Loisel.) DC. -- not accepted
  Trachypogon argenteus (DC.) Nees -- not accepted
  Trachypogon laguroides (DC.) Nees -- not accepted
  Tragia jonesii Radcl.-Sm. & Govaerts -- accepted -- Jones' noseburn
  Tragia plukenetii Radcl.-Sm. -- accepted
  Transberingia bursifolia (DC.) Al-Shehbaz & O'Kane -- accepted
  Transberingia bursifolia ssp. bursifolia (DC.) Al-Shehbaz & O'Kane -- accepted
  Trembleya DC. -- accepted
  Trembleya phlogiformis DC. -- accepted -- island glorybush
  Trepocarpus Nutt. ex DC. -- accepted
  Trepocarpus aethusae Nutt. ex DC. -- accepted -- whitenymph
  Trevirana andrieuxii (DC.) D. Dietr. -- not accepted
  Trevirana comifera (DC.) Dietr. -- not accepted
  Trevirana erinoides (DC.) Dietr. -- not accepted
  Trevirana hirsuta (DC.) D. Dietr. -- not accepted
  Trevirana longiflora (DC.) D. Dietr. -- not accepted
  Trevirana tenella (DC.) D. Dietr. -- not accepted
  Trichantha anisophylla (DC.) Wiehler -- not accepted
  Trichochloa DC. -- not accepted
  Trichochloa capillaris (Lam.) DC. -- not accepted
  Trichochloa expansa (Poir.) DC. -- not accepted
  Trichochloa microsperma DC. -- not accepted
  Trichochloa polypogon DC. -- not accepted
  Trichomanes baldwinii (D.C. Eaton) Copel. -- not accepted
  Trichomanes osmundoides DC. ex Poir. -- accepted
  Trichosporum acuminatum (Wall. ex A. DC.) Kuntze -- not accepted
  Trichosporum acuminatum (Wall. ex A. DC.) Matsum. -- not accepted
  Trichosporum perrottetii (DC.) Kuntze -- not accepted
  Trifolium arvense var. perpusillum DC. -- not accepted
  Trigonella ornithopodioides (L.) DC. -- not accepted
  Trimorpha acris var. kamtschatica (DC.) G.L. Nesom -- not accepted
  Triphasia trifoliata (L.) DC. -- not accepted
  Triticum glaucum Desf. ex DC. -- not accepted
  Triticum obtusiflorum DC. -- not accepted
  Triumfetta bogotensis DC. -- accepted -- parquet bur, parquet burr
  Tupa robusta (Graham) A. DC. -- not accepted
  Turnera coerula DC. -- accepted
  Unamia lutescens (Lindl. ex DC.) Rydb. -- not accepted
  Uropappus lindleyi (DC.) Nutt. -- accepted -- Lindley's silverpuffs
  Utricularia guyanensis A. DC. -- accepted
  Valerianella chenopodiifolia (Pursh) DC. -- accepted -- goosefoot cornsalad
  Vargasia caracassana D.C. -- not accepted
  Vasconcellea monoica (Desf.) A. DC. -- accepted
  Vasconcellea pubescens A. DC. -- accepted
  Venegasia DC. -- accepted -- venegasia
  Venegasia carpesioides DC. -- accepted -- canyon sunflower
  Verbesina microptera DC. -- accepted -- Texas crownbeard
  Verbesina microptera (DC.) Herter non DC. -- not accepted -- Texas crownbeard
  Vernonia arkansana DC. -- accepted -- Arkansas ironweed
  Vernonia cinerea var. parviflora (Reinw.) DC. -- not accepted
  Verticordia DC. -- accepted
  Vicia disperma DC. -- accepted -- European vetch
  Vicia lutea var. hirta (Balb. ex DC.) Loisel. -- not accepted
  Vicia orobus DC. -- accepted
  Vigna caracalla (L.) Verdc. -- accepted -- snailflower
  Vigna juruana (Harms) Verdc. -- accepted -- tropical cowpea
  Vigna lasiocarpa (Mart. ex Benth.) Verdc. -- accepted
  Vigna longifolia (Benth.) Verdc. -- accepted -- longleaf cowpea
  Vigna praecox Verdc. -- accepted
  Vigna radiata var. sublobata (Roxb.) Verdc. -- accepted -- mung bean
  Vigna speciosa (Kunth) Verdc. -- accepted -- prairie vetch, wondering cowpea
  Vigna subterranea (L.) Verdc. -- accepted -- bambarra groundnut
  Vigna unguiculata ssp. cylindrica (L.) Verdc. -- not accepted -- catjang
  Vigna unguiculata ssp. dekindtiana (Harms) Verdc. -- not accepted -- blackeyed pea
  Vigna unguiculata ssp. sesquipedalis (L.) Verdc. -- not accepted -- yardlong bean
  Viola macloskeyi ssp. pallens (Banks ex DC.) M.S. Baker -- not accepted -- smooth white violet
  Viola macloskeyi var. pallens (Banks ex DC.) C.L. Hitchc. -- not accepted
  Viola pallens (Banks ex DC.) Brainerd -- not accepted
  Viola palmata var. triloba (Schwein.) Ging. ex DC. -- not accepted
  Viola patrinii DC. -- accepted -- China violet
  Viola pedata var. lineariloba DC. -- not accepted
  Viola pedata var. ranunculifolia (Juss. ex Poir.) Ging. ex DC. -- accepted -- birdfoot violet
  Viola tricolor var. arvensis (Murray) DC. -- not accepted
  Virgulus patens var. patentissimus (Lindl. ex DC.) Reveal & Keener -- not accepted
  Viscum hexastichum DC. -- not accepted
  Viscum mucronatum DC. -- not accepted
  Voandzeia subterranea (L.) DC. -- not accepted
  Wahlenbergia gracilis (G. Forst.) A. DC. -- accepted
  Wahlenbergia linarioides (Lam.) A. DC. -- accepted -- tuffybells
  Wahlenbergia marginata (Thunb.) A. DC. -- accepted -- southern rockbell
  Wallenia lamarckiana (A. DC.) Mez -- accepted -- jacanillo
  Wedelia biflora (L) DC -- accepted
  Wedelia lanceolata DC. -- accepted -- riverbank creepingoxeye
  Wedelia reticulata DC. -- accepted -- manazanilla del monte
  Weigela florida (Bunge) A. DC. -- accepted -- oldfashioned weigela
  Wisteria floribunda (Willd.) DC. -- accepted -- Japanese wisteria
  Wisteria sinensis (Sims) DC. -- accepted -- Chinese wisteria
  Wollastonia DC. ex Decn. -- accepted
  Wollastonia biflora (L) DC -- not accepted
  Woodsia oregana D.C. Eaton -- accepted -- Oregon cliff fern, Oregon woodsia, western cliff fern, woodsie de l'Oregon
  Woodsia oregana ssp. oregana D.C. Eaton -- accepted -- Oregon cliff fern
  Woodsia scopulina D.C. Eaton -- accepted -- Rocky Mountain cliff fern, Rocky Mountain woodsia, woodsie des rochers
  Woodsia scopulina ssp. scopulina D.C. Eaton -- accepted -- Rocky Mountain woodsia
  Wyethia angustifolia (DC.) Nutt. -- accepted -- California compassplant
  Wyethia helenioides (DC.) Nutt. -- accepted -- whitehead mule-ears
  Xanthisma DC. -- accepted -- sleepydaisy, xanthium
  Xanthisma texanum DC. -- accepted -- Texas sleepy-daisy, Texas sleepydaisy
  Xanthisma texanum ssp. texanum DC. -- not accepted -- Texas sleepydaisy
  Xanthisma texanum ssp. texanum var. texanum DC. -- not accepted -- Texas sleepydaisy
  Xanthisma texanum var. texanum DC. -- accepted -- Texas sleepydaisy
  Xanthium macrocarpum var. glabratum DC. -- not accepted
  Xanthium strumarium var. glabratum (DC.) Cronquist -- not accepted -- cocklebur, common cocklebur, rough cocklebur, rough cockleburr
  Xanthocephalum dracunculoides (DC.) Shinners -- not accepted
  Xanthocephalum microcephalum (DC.) Shinners -- not accepted
  Xanthocephalum texanum (DC.) Shinners -- not accepted
  Ximenesia encelioides var. cana DC. -- not accepted
  Ximenesia microptera DC. -- not accepted
  Xiphocarpus candidus (DC.) Hassk. -- not accepted
  Youngia japonica (L) DC -- accepted -- oriental false hawksbeard
  Youngia japonica var. japonica (L) DC -- not accepted
  Youngia thunbergiana DC. -- not accepted
  Zamia boliviana (Brongn.) A. DC. -- accepted
  Zamia floridana A. DC. -- not accepted
  Zamia furfuracea var. trewii A. DC. -- not accepted
  Zamia multifoliolata A. DC. -- not accepted
  Zamia spartea A. DC. -- accepted
  Zanthoxylum martinicense (Lam.) DC. -- accepted -- white pricklyash
  Zanthoxylum spinifex (Jacq.) DC. -- not accepted -- niaragato
  Zanthoxylum tragodes (Jacq.) DC. -- accepted
  Zinnia acerosa (DC.) A. Gray -- accepted -- desert zinnia, spinyleaf zinnia
  Zizia cordata W.D.J. Koch ex DC. -- not accepted
  Ziziphus reticulata (Vahl) DC. -- accepted -- cacao rojo
  Zornia dyctiocarpa DC. -- accepted
 
 Kingdom Bacteria
  Rivularia haematites (Dc) C. A. Agardh -- valid
   

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