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Taxon author: Willd.

ITIS records citing taxon author "Willd."
 
 Kingdom Fungi
  Cladonia botrytes (K.G. Hagen) Willd. -- accepted
  Cladonia coccifera (L.) Willd. -- accepted
  Cladonia gracilis (L.) Willd. -- accepted
  Peltigera Willd. -- accepted
  Tuckermannopsis chlorophylla (Willd.) Hale -- accepted
 
 Kingdom Plantae
  Abutilon grandifolium (Willd.) Sweet -- accepted -- hairy Indian mallow
  Abutilon mollicomum (Willd.) Sweet -- accepted -- Sonoran Indian mallow
  Abutilon permolle (Willd.) Sweet -- accepted -- coastal Indian mallow
  Acacia arabica (Lam.) Willd. -- not accepted
  Acacia arenosa Willd. -- not accepted
  Acacia catechu (L. f.) Willd. -- accepted -- black cutch
  Acacia cornigera (L.) Willd. -- not accepted -- bullhorn wattle
  Acacia decurrens Willd. -- accepted -- black wattle, green wattle
  Acacia decurrens var. decurrens Willd. -- not accepted -- green wattle
  Acacia eburnea (L. f.) Willd. -- not accepted
  Acacia farnesiana (L.) Willd. -- not accepted -- aroma, Ellington's curse, huisache, kandaroma, klu, klu bush, popinac, sweet acacia, Texas huisache
  Acacia floribunda (Vent.) Willd. -- accepted
  Acacia horrida (L.) Willd. -- accepted
  Acacia juniperina (Vent.) Willd. -- not accepted
  Acacia lebbeck (L.) Willd. -- not accepted
  Acacia longifolia (Andrews) Willd. -- accepted -- Sydney golden wattle, western yarrow
  Acacia macracantha Humb. & Bonpl. ex Willd. -- not accepted -- long-spine acacia, porknut
  Acacia mangium Willd. -- accepted
  Acacia mucronata Willd. ex H.L. Wendl. -- accepted -- narrow-leaf wattle
  Acacia muricata (L.) Willd. -- not accepted -- spineless wattle
  Acacia myrtifolia (Sm.) Willd. -- accepted
  Acacia nilotica (L.) Willd. ex Delile -- not accepted -- gum arabic tree
  Acacia polyacantha Willd. -- accepted -- catechu tree
  Acacia senegal (L.) Willd. -- accepted -- gum arabic
  Acacia stricta (Andrews) Willd. -- accepted
  Acacia suaveolens (Sm.) Willd. -- accepted -- sweet acacia, sweet wattle
  Acacia tortuosa (L.) Willd. -- not accepted -- huisachillo, poponax, twisted acacia
  Acacia verticillata (L'Hér.) Willd. -- accepted -- prickly Moses
  Acacia villosa (Sw.) Willd. -- not accepted
  Acalypha lanceolata Willd. -- accepted
  Acalypha lanceolata var. lanceolata Willd. -- accepted
  Acer obtusatum Waldst. & Kit. ex Willd. -- not accepted
  Acer opalus ssp. obtusatum (Waldst. & Kit. ex Willd.) Gams -- accepted
  Achillea distans Waldst. & Kit. ex Willd. -- accepted -- Alps yarrow
  Achnatherum soboliferum (Muhl. ex Willd.) P. Beauv. -- not accepted
  Achnodon bellardii (Willd.) Link -- not accepted
  Achnodonton bellardi (Willd.) P. Beauv. -- not accepted
  Actaea rubra (Aiton) Willd. -- accepted -- red baneberry, western baneberry
  Actaea rubra ssp. rubra (Aiton) Willd. -- not accepted -- red baneberry
  Actinochloa Willd. ex Roem. & Schult. -- not accepted
  Actinochloa gracilis (Kunth) Willd. ex Roem. & Schult. -- not accepted
  Actinochloa humilis (P. Beauv. ex Kunth) Willd. ex Roem. & Schult. -- not accepted
  Actinochloa tenuis (P. Beauv. ex Kunth) Willd. ex Roem. & Schult. -- not accepted
  Acuan depressum (Humb. & Bonpl. ex Willd.) Kuntze -- not accepted
  Adiantum concinnum Humb. & Bonpl. ex Willd. -- accepted -- polished maidenhair
  Adiantum melanoleucum Willd. -- accepted -- fragrant maidenhair
  Adiantum obliquum Willd. -- accepted -- oblique maidenhair
  Adiantum pyramidale (L.) Willd. -- accepted -- pyramid maidenhair
  Adiantum tetraphyllum Humb. & Bonpl. ex Willd. -- accepted -- fourleaf maidenhair
  Adipera laevigata (Willd.) Britton & Rose ex Britton & P. Wilson -- not accepted
  Aegilops ovata ssp. triaristata (Willd.) Rouy -- not accepted
  Aegilops ovata var. triaristata (Willd.) Lindb. -- not accepted
  Aegilops ovata var. triaristata (Willd.) Bluff ex Nees -- not accepted
  Aegilops ovata var. triaristata (Willd.) W. Koch -- not accepted
  Aegilops triaristata Willd. -- not accepted
  Aegopogon Humb. & Bonpl. ex Willd. -- accepted -- relaxgrass
  Aegopogon cenchroides Humb. & Bonpl. ex Willd. -- not accepted -- relaxgrass
  Aeschynomene paniculata Willd. ex Vogel -- accepted -- panicle jointvetch
  Aeschynomene paniculatus Willd. ex Vogel -- not accepted
  Aesculus glabra Willd. -- accepted -- buckeye, Ohio buckeye, Texas buckeye
  Aesculus glabra var. glabra Willd. -- accepted -- Ohio buckeye
  Aesculus glabra var. pallida (Willd.) G. Kirchn. -- not accepted
  Agapanthus praecox Willd. -- accepted -- African-lily
  Agastache scrophulariifolia (Willd.) Kuntze -- accepted -- purple giant hyssop
  Agathosma Willd. -- accepted
  Agropyron cristatum ssp. sibiricum (Willd.) Á. Löve -- not accepted
  Agropyron fragile ssp. sibiricum (Willd.) Melderis -- not accepted -- Siberian wheatgrass
  Agropyron fragile var. sibiricum (Willd.) Tzvelev -- not accepted
  Agropyron sibiricum (Willd.) P. Beauv. -- not accepted
  Agrostis anomala Willd. -- not accepted
  Agrostis aspera Willd. ex Steud. -- not accepted
  Agrostis brachyphylla Willd. ex Steud. -- not accepted
  Agrostis caespitosa Willd. ex Steud. -- not accepted
  Agrostis ciliata Willd. ex Steud. -- not accepted
  Agrostis colorata Willd. ex Steud. -- not accepted
  Agrostis condensata Willd. ex Steud. -- not accepted
  Agrostis cuspidata Willd. ex Steud. -- not accepted
  Agrostis gracilis Willd. ex Steud. -- not accepted
  Agrostis hispida Willd. -- not accepted
  Agrostis hyemalis var. scabra (Willd.) H.L. Blomq. -- not accepted
  Agrostis junciformis Willd. ex Steud. -- not accepted
  Agrostis laxiflora var. scabra (Willd.) Torr. -- not accepted
  Agrostis longiflora Willd. ex Steud. -- not accepted
  Agrostis palustris var. stricta (Willd.) House -- not accepted
  Agrostis poiformis Willd. ex Steud. -- not accepted
  Agrostis pubens Willd. ex Steud. -- not accepted
  Agrostis quitensis Willd. ex Steud. -- not accepted
  Agrostis retrofracta Willd. -- not accepted
  Agrostis scabra Willd. -- accepted -- rough bent, rough bentgrass, ticklegrass
  Agrostis scabra var. scabra Willd. -- not accepted -- rough bentgrass
  Agrostis setosa Willd. ex Trin. -- not accepted
  Agrostis sobolifera Muhl. ex Willd. -- not accepted
  Agrostis stolonifera var. hispida (Willd.) Farw. -- not accepted
  Agrostis stricta Willd. -- not accepted
  Agrostis tenella Willd. ex Steud. -- not accepted
  Agrostis tenuiflora Willd. -- not accepted
  Agrostis tenuis var. hispida (Willd.) Philipson -- not accepted
  Agrostis tolucensis Willd. ex Steud. -- not accepted
  Agrostis tremula Willd. -- not accepted
  Agrostis vulgaris var. hispida (Willd.) Gaudin -- not accepted
  Agrostis vulgaris var. hispida (Willd.) G. Mey. -- not accepted
  Aiphanes Willd. -- accepted -- aiphanes
  Aiphanes aculeata Willd. -- not accepted
  Aira elegans Willd. ex Gaudin -- not accepted
  Aira elegans Willd. ex Kunth -- not accepted -- annual silver hairgrass, elegant hairgrass
  Aira pulchella Willd. -- not accepted
  Albizia lophantha (Willd.) Benth. -- not accepted
  Alcea pallida (Waldst. & Kit. ex Willd.) Waldst. & Kit. -- accepted
  Aleurites laccifera (L.) Willd. -- not accepted
  Aleurites moluccana (L.) Willd. -- not accepted -- Indian walnut, kukui
  Aleurites moluccanus (L.) Willd. -- accepted
  Allium X proliferum (Moench) Schrad. ex Willd. -- not accepted -- garden onion
  Alnus serrulata (Aiton) Willd. -- accepted -- brook-side alder, hazel alder
  Aloe humilis var. echinata (Willd.) Baker -- not accepted
  Alopecurus glomeratus (Willd.) Poir. -- not accepted
  Alopecurus gracilis Willd. ex Trin. -- not accepted
  Alopecurus maritimus (Willd.) Poir. -- not accepted
  Alpinia galanga (L.) Willd. -- accepted -- greater galangal
  Alsine longifolia (Muhl. ex Willd.) Britton -- not accepted
  Alsophila borbonica var. laevigata (Willd. ex Kaulf.) comb. ined. -- not accepted
  Alsophila marattioides (Willd.) R.M. Tryon -- not accepted
  Alsophila procera (Willd.) Desv. -- not accepted
  Alysicarpus rugosus (Willd.) DC. -- accepted -- red moneywort
  Alyssum tortuosum Waldst. & Kit. ex Willd. -- accepted
  Amaranthus chlorostachys Willd. -- not accepted
  Ambrosia paniculata var. peruviana (Willd.) O.E. Schulz -- not accepted
  Ambrosia peruviana Willd. -- accepted -- Peruvian ragweed
  Ambrosia trifida var. integrifolia (Muhl. ex Willd.) Torr. & A. Gray -- not accepted
  Ammannia auriculata Willd. -- accepted -- eared redstem, earleaf ammannia
  Anatherum tripsacoides (Humb. & Bonpl. ex Willd.) Spreng. -- not accepted
  Andromeda pulverulenta W. Bartram ex Willd. -- not accepted
  Andropogon acicularis Willd. -- not accepted
  Andropogon arundinaceus Willd. -- not accepted
  Andropogon bracteatus Humb. & Bonpl. ex Willd. -- not accepted
  Andropogon contortus subvar. secundus (Willd. ex Nees) Hack. -- not accepted
  Andropogon furcatus Muhl. ex Willd. -- not accepted
  Andropogon hispidus Humb. & Bonpl. ex Willd. -- not accepted
  Andropogon pertusus (L.) Willd. -- not accepted
  Andropogon plumosus Humb. & Bonpl. ex Willd. -- not accepted
  Andropogon provincialis subvar. furcatus (Muhl. ex Willd.) Hack. -- not accepted
  Andropogon purpurascens Muhl. ex Willd. -- not accepted
  Andropogon secundus Willd. ex Nees -- not accepted
  Andropogon secundus Willd. ex Griseb. -- not accepted
  Andropogon tripsacoides (Humb. & Bonpl. ex Willd.) Steud. -- not accepted
  Angostura trifoliata (Willd.) T.S. Elias -- accepted
  Anisophyllum humifusum (Willd.) Klotzsch & Garcke -- not accepted
  Anisophyllum vahlii Willd. ex Klotzsch & Garcke -- not accepted
  Anona obovata Willd. -- not accepted
  Anthistiria arguens (L.) Willd. -- not accepted
  Anthoxanthum monticola ssp. alpinum (Sw. ex Willd.) Soreng -- accepted
  Apargia hispida (L.) Willd. -- not accepted
  Apera tenuiflora (Willd.) P. Beauv. -- not accepted
  Aplectrum hyemale (Muhl. ex Willd.) Torr. -- accepted -- Adam and Eve, aplectrelle d'hiver, puttyroot
  Arabis caucasica Willd. -- accepted -- garden rockcress, gray rockcress
  Arabis laevigata (Muhl. ex Willd.) Poir. -- not accepted -- smooth rock-cress, smooth rockcress
  Arabis laevigata var. laevigata (Muhl. ex Willd.) Poir. -- not accepted -- smooth rockcress
  Arceuthobium vaginatum (Willd.) J. Presl -- accepted -- pine dwarf mistletoe, pineland dwarf mistletoe
  Arceuthobium vaginatum (Willd.) J. Presl -- not accepted
  Arenaria sajanensis auct. non Willd. ex Schltdl. -- not accepted
  Arenaria sajanensis Willd. ex Schltdl. -- not accepted
  Argyranthemum anethifolium (Willd.) Webb -- not accepted
  Argyranthemum foeniculum (Willd.) Sch. Bip. -- accepted -- dill daisy
  Aristida adscensionis var. canariensis (Willd.) T. Durand & Schinz -- not accepted
  Aristida canariensis Willd. -- not accepted
  Aristida divaricata Humb. & Bonpl. ex Willd. -- accepted -- poverty threeawn
  Aristida geminata Willd. ex Steud. -- not accepted
  Aristida laxa Willd. ex Trin. & Rupr. -- not accepted
  Aristida unilateralis Willd. ex Steud. -- not accepted
  Aristida vulgaris var. canariensis (Willd.) Trin. & Rupr. -- not accepted
  Aristolochia labiata Willd. -- accepted -- mottled dutchman's pipe
  Aristolochia surinamensis Willd. -- accepted
  Armeria Willd. -- accepted
  Armeria alpina Willd. -- accepted
  Armeria maritima (Mill.) Willd. -- accepted -- thrift seapink
  Armeria maritima ssp. alpina (Willd.) P. Silva -- not accepted
  Armeria maritima ssp. maritima (Mill.) Willd. -- accepted -- thrift seapink
  Armeria plantaginea Willd. -- not accepted
  Armeria scabra Pall. ex Willd. -- not accepted
  Armeria vulgaris Willd. -- not accepted
  Aronia arbutifolia var. nigra (Willd.) Seymour -- not accepted
  Aronia nigra (Willd.) Koehne -- not accepted
  Arrhenatherum avenaceum var. bulbosum (Willd.) Hartm. -- not accepted
  Arrhenatherum bulbosum (Willd.) C. Presl -- not accepted
  Arrhenatherum elatius f. bulbosum (Willd.) T. Koyama -- not accepted
  Arrhenatherum elatius ssp. bulbosum (Willd.) Schübl. & G. Martens -- accepted
  Arrhenatherum elatius ssp. bulbosum (Willd.) Hyl. -- not accepted
  Arrhenatherum elatius var. bulbosum (Willd.) Spenn. -- accepted -- tall oatgrass, tuber oatgrass
  Artemisia alpina Pall. ex Willd. -- accepted
  Artemisia biennis Willd. -- accepted -- biennial sagewort, biennial wormwood
  Artemisia biennis var. biennis Willd. -- not accepted -- biennial wormwood
  Artemisia caucasica Willd. -- not accepted
  Artemisia dracunculus ssp. glauca (Pall. ex Willd.) H.M. Hall & Clem. -- not accepted -- dragon wormwood
  Artemisia dracunculus var. glauca (Pall. ex Willd.) Besser -- not accepted
  Artemisia frigida Willd. -- accepted -- fringed sagebrush, fringed sagewort, prairie sagewort
  Artemisia glauca Pall. ex Willd. -- not accepted
  Artemisia laciniata Willd. -- accepted -- Siberian wormwood
  Artemisia laciniata ssp. laciniata Willd. -- accepted -- Yukon wormwood
  Artemisia ludoviciana ssp. mexicana (Willd. ex Spreng.) D.D. Keck -- accepted -- cudweed sagewort, Louisiana sagewort, Mexican sagewort, Mexican white sagebrush, white sagebrush
  Artemisia ludoviciana var. mexicana (Willd. ex Spreng.) A. Gray -- not accepted
  Artemisia mexicana Willd. ex Spreng. -- not accepted
  Artemisia procera Willd. -- not accepted
  Artemisia vulgaris var. mexicana (Willd. ex Spreng.) Torr. & A. Gray -- not accepted
  Arundinaria glaucescens (Willd.) P. Beauv. -- not accepted
  Arundinella hispida (Humb. & Bonpl. ex Willd.) Kuntze -- accepted
  Arundinella hispida (Humb. & Bonpl. ex Willd.) Hack. -- not accepted
  Arundo calycina Willd. ex Steud. -- not accepted
  Arundo confinis Willd. -- not accepted
  Arundo fastuosa Willd. ex Steud. -- not accepted
  Arundo festucacea Willd. -- not accepted
  Arundo fissa Willd. ex Steud. -- not accepted
  Asarina antirrhiniflora (Humb. & Bonpl. ex Willd.) Pennell -- not accepted
  Asarum hypericoides var. multicaule (Michx. ex Willd.) Fernald -- not accepted
  Asclepias incarnata ssp. pulchra (Ehrh. ex Willd.) Woodson -- accepted -- swamp milkweed
  Asclepias incarnata var. pulchra (Ehrh. ex Willd.) Pers. -- not accepted
  Asclepias pulchra Ehrh. ex Willd. -- not accepted
  Ascyrum hypericoides var. multicaule (Michx. ex Willd.) Fernald -- not accepted
  Ascyrum stans Michx. ex Willd. -- not accepted
  Asimina obovata (Willd.) Nash -- accepted -- bigflower pawpaw
  Asplenium abscissum Willd. -- accepted -- cutleaf spleenwort
  Asplenium cirrhatum Rich. ex Willd. -- accepted -- chestnut scale spleenwort
  Asplenium formosum Willd. -- accepted -- showy spleenwort
  Asplenium montanum Willd. -- accepted -- mountain spleenwort
  Asplenium radicans var. cirrhatum (Rich. ex Willd.) Rosenst. -- not accepted
  Asplenium rutaceum (Willd.) Mett. -- accepted -- rue spleenwort
  Asprella Willd. -- not accepted
  Asprella hystrix (L.) Willd. -- not accepted
  Asprella virginica (Willd.) P. Beauv. -- not accepted
  Asprella virginica (Willd.) Roem. & Schult. -- not accepted
  Aster altaicus Willd. -- not accepted
  Aster bellidiflorus Willd. -- not accepted
  Aster caucasicus Willd. -- accepted
  Aster concinnus Willd. -- not accepted
  Aster cordifolius ssp. sagittifolius (Wedem. ex Willd.) A.G. Jones -- not accepted
  Aster cordifolius var. sagittifolius (Wedem. ex Willd.) A.G. Jones -- not accepted -- swordleaf wood aster
  Aster elegans (Nutt.) Torr. & A. Gray non Willd. -- not accepted
  Aster eminens Willd. -- not accepted
  Aster fragilis auct. non Willd. -- not accepted -- aster fragile, fragilestem aster
  Aster fragilis var. fragilis Willd. -- not accepted -- fairy aster
  Aster humilis Willd. -- not accepted
  Aster laevis var. concinnus (Willd.) House -- not accepted -- smooth aster
  Aster lanceolatus Willd. -- not accepted -- white panicle aster
  Aster lanceolatus ssp. lanceolatus Willd. -- not accepted -- white panicle aster
  Aster lanceolatus ssp. lanceolatus var. lanceolatus Willd. -- not accepted
  Aster lanceolatus ssp. simplex (Willd.) A.G. Jones -- not accepted
  Aster lanceolatus var. simplex (Willd.) A.G. Jones -- not accepted
  Aster laxus Willd. -- not accepted
  Aster paniculatus var. simplex (Willd.) Burgess -- not accepted
  Aster patens var. phlogifolius (Muhl. ex Willd.) Nees -- not accepted
  Aster phlogifolius Muhl. ex Willd. -- not accepted
  Aster pilosus Willd. -- not accepted -- white heath aster, white oldfield aster
  Aster pilosus var. pilosus Willd. -- not accepted -- white oldfield aster
  Aster polyphyllus Willd. non Moench -- not accepted
  Aster prenanthoides Muhl. ex Willd. -- not accepted -- crookedstem aster
  Aster sagittifolius Wedem. ex Willd. -- not accepted
  Aster sagittifolius Wedem. ex Willd. -- not accepted
  Aster sagittifolius auct. non Wedem. ex Willd. -- not accepted
  Aster salicifolius sensu Willd. non Lam. nec Aiton -- not accepted
  Aster simplex Willd. -- not accepted
  Aster X salignus Willd. -- not accepted
  Aster X versicolor Willd. (pro sp.) -- not accepted
  Astragalus aduncus Willd. -- accepted
  Astragalus scorpioides Pourr. ex Willd. -- accepted
  Atheropogon Muhl. ex Willd. -- not accepted
  Atheropogon apludioides Muhl. ex Willd. -- not accepted
  Athyrium angustum (Willd.) C. Presl -- not accepted
  Athyrium angustum var. angustum (Willd.) C. Presl -- not accepted
  Athyrium filix-femina ssp. angustum (Willd.) R.T. Clausen -- not accepted -- subarctic ladyfern
  Athyrium filix-femina var. angustum (Willd.) G. Lawson -- accepted -- subarctic ladyfern
  Atrichum cylindricum (Willd. in Web.) G.L. Sm. -- accepted -- cylindrical atrichum moss
  Atriplex cristata Humb. & Bonpl. ex Willd. -- accepted -- crested saltbush
  Atriplex patula var. triangularis (Willd.) K.H. Thorne & S.L. Welsh -- not accepted
  Atriplex prostrata var. triangularis (Willd.) Rauschert -- not accepted
  Atriplex triangularis Willd. -- not accepted
  Avena bulbosa Willd. -- not accepted
  Avena cuspidata Willd. ex Spreng. -- not accepted
  Avena elatior ssp. bulbosa (Willd.) Litard. -- not accepted
  Avena elatior var. bulbosa (Willd.) St.-Amans -- not accepted
  Avena elegans (Willd. ex Gaudin) Asch. -- not accepted
  Avena paradoxa Willd. ex Kunth -- not accepted
  Avena stipoides Willd. ex Steud. -- not accepted
  Azalea speciosa Willd. -- not accepted
  Azolla caroliniana Willd. -- not accepted -- Carolina mosquitofern
  Azolla magellanica Willd. -- not accepted
  Baccharis cotinifolia (Willd.) Urb. -- not accepted
  Bambusa arundinacea (Retz.) Willd. -- not accepted -- bamboo
  Bambusa glaucescens (Willd.) Merr. -- not accepted -- golden goddess bamboo
  Bambusa verticillata Willd. -- not accepted
  Barosma serratifolia (Curtis) Willd. -- not accepted
  Bartonia Muhl. ex Willd. -- accepted -- screwstem
  Begonia cucullata Willd. -- accepted -- clubed begonia
  Begonia ulmifolia Willd. -- accepted
  Bernardia dichotoma (Willd.) Müll. Arg. -- accepted -- Caribbean myrtlecroton
  Berrya cordifolia (Willd.) Burret -- accepted
  Betonica grandiflora Stephan ex Willd. -- not accepted
  Biatherium foliosum (Willd.) Desv. -- not accepted
  Bidens connata Muhl. ex Willd. -- accepted -- purple-stem beggarticks, purplestem beggarticks
  Blachia umbellata (Willd.) Baill. -- accepted
  Blechnum appendiculatum Willd. -- accepted -- palm fern
  Blephariglotis blephariglottis (Willd.) Rydb. -- not accepted
  Blephariglottis blephariglottis (Willd.) Rydb. -- not accepted
  Bocconia cordata Willd. -- not accepted
  Boechera laevigata (Muhl. ex Willd.) Al-Shehbaz -- accepted -- smooth rockcress
  Bombax vitifolium Willd. -- not accepted
  Botrychium dissectum var. obliquum (Muhl. ex Willd.) Clute -- not accepted
  Botrychium obliquum Muhl. ex Willd. -- not accepted
  Bougainvillea spectabilis Willd. -- accepted -- great bougainvillea
  Brasiliopuntia brasiliensis (Willd.) A. Berger -- accepted
  Bridelia Willd. -- accepted
  Bromopsis pubescens (Muhl. ex Willd.) Holub -- not accepted
  Bromus glaber Willd. ex Steud. -- not accepted
  Bromus hookeri var. pubescens (Muhl. ex Willd.) E. Fourn. -- not accepted
  Bromus mucronatus Willd. ex Steud. -- not accepted
  Bromus pubescens Muhl. ex Willd. -- accepted -- brome pubescent, hairy wood brome grass, hairy woodland brome
  Bromus quitensis Willd. ex Steud. -- not accepted
  Bromus unioloides (Willd.) Raspail -- not accepted
  Brugmansia suaveolens (Humb. & Bonpl. ex Willd.) Bercht. & C. Presl -- accepted -- angel's-tears
  Buddleja saligna Willd. -- accepted -- squarestem butterflybush
  Bumelia tenax (L.) Willd. -- not accepted -- tough bumelia
  Butea Roxb. ex Willd. -- accepted
  Buxus citrifolia (Willd.) Spreng. -- not accepted
  Cacalia reniformis Muhl. ex Willd. non Cacalia reniformis Lam. -- not accepted
  Cactus brasiliensis Willd. -- not accepted
  Cactus triacanthos Willd. -- not accepted
  Cactus triacanthus Willd. -- not accepted
  Caesalpinia coriaria (Jacq.) Willd. -- not accepted -- divi divi
  Cakile lanceolata (Willd.) O.E. Schulz -- accepted -- coastal searocket
  Cakile lanceolata ssp. lanceolata (Willd.) O.E. Schulz -- accepted -- coastal searocket
  Calamagrostis confinis (Willd.) P. Beauv. -- not accepted
  Calamagrostis neglecta var. confinis (Willd.) Beal -- not accepted
  Calamagrostis retrofracta (Willd.) Link -- not accepted
  Calliandra laxa (Willd.) Benth. -- accepted -- Cuming's stickpea
  Calycanthus floridus var. glaucus (Willd.) Torr. & A. Gray -- accepted -- eastern sweetshrub
  Calycanthus floridus var. laevigatus (Willd.) Torr. & A. Gray -- not accepted
  Campanula alliariifolia Willd. -- accepted
  Capnoides aureum (Willd.) Kuntze -- not accepted
  Capsicum baccatum var. pendulum (Willd.) Eshbaugh -- accepted -- aji
  Capsicum pendulum Willd. -- not accepted
  Cardamine laciniata (Muhl. ex Willd.) Alph. Wood -- not accepted
  Cardamine minuta Willd. ex DC. -- not accepted
  Cardamine pensylvanica Muhl. ex Willd. -- accepted -- Pennsylvania bittercress, Quaker bittercress
  Carduus discolor (Muhl. ex Willd.) Nutt. -- not accepted
  Carex albicans auct. non Willd. ex Spreng. -- not accepted -- whitetinge sedge
  Carex albicans Willd. ex Spreng. -- accepted -- whitetinge sedge
  Carex albicans var. albicans Willd. ex Spreng. -- accepted -- whitetinge sedge
  Carex bromoides Schkuhr ex Willd. -- accepted -- brome-like sedge, bromelike sedge
  Carex bromoides ssp. bromoides Schkuhr ex Willd. -- accepted -- brome-like sedge
  Carex bromoides var. bromoides Schkuhr ex Willd. -- not accepted -- bromelike sedge
  Carex bullata Schkuhr ex Willd. -- accepted -- button sedge
  Carex cephalophora Muhl. ex Willd. -- accepted -- oval-leaf sedge, oval-leaved sedge, ovalleaf sedge
  Carex complanata var. hirsuta (Willd.) Gleason -- not accepted
  Carex conoidea Schkuhr ex Willd. -- accepted -- open-field sedge, openfield sedge
  Carex digitalis Willd. -- accepted -- slender wood sedge, slender woodland sedge
  Carex digitalis var. digitalis Willd. -- accepted -- slender woodland sedge
  Carex festucacea Schkuhr ex Willd. -- accepted -- fescue sedge
  Carex flexuosa Muhl. ex Willd. -- not accepted
  Carex foenea Willd. -- accepted -- dry-spike sedge, dryspike sedge, wind sedge
  Carex foenea var. foenea Willd. -- not accepted -- dry-spike sedge, dryspike sedge, silvertop sedge
  Carex granularis Muhl. ex Willd. -- accepted -- limestone meadow sedge, limestone-meadow sedge
  Carex granularis var. granularis Muhl. ex Willd. -- not accepted -- limestone meadow sedge, limestone-meadow sedge
  Carex hystericina Muhl. ex Willd. -- accepted -- bottlebrush sedge, porcupine sedge
  Carex lacustris Willd. -- accepted -- hairy sedge, lakebank sedge
  Carex leersii Willd. -- not accepted
  Carex livida (Wahlenb.) Willd. -- accepted -- livid sedge
  Carex lonchocarpa Willd. -- accepted -- southern long sedge
  Carex lucorum Willd. ex Link -- accepted -- Blue Ridge sedge
  Carex lucorum var. lucorum Willd. ex Link -- accepted -- Blue Ridge sedge
  Carex lupulina Muhl. ex Willd. -- accepted -- hop sedge
  Carex macrocephala Willd. ex Spreng. -- accepted -- largehead sedge
  Carex macrocephala var. macrocephala Willd. ex Spreng. -- not accepted -- largehead sedge
  Carex marginata Willd. -- not accepted
  Carex melanostachya M. Bieb. ex Willd. -- accepted -- Great Plains sedge
  Carex muehlenbergii Schkuhr ex Willd. -- accepted -- carex de Mühlenberg, Muhlenberg's sedge
  Carex muehlenbergii var. muehlenbergii Schkuhr ex Willd. -- accepted -- Muhlenberg's sedge
  Carex muricata var. sterilis (Willd.) Gleason -- not accepted
  Carex oligocarpa Schkuhr ex Willd. -- accepted -- carex ŕ fruits clairsemés, eastern few-fruit sedge, richwoods sedge
  Carex pedunculata Muhl. ex Willd. -- accepted -- long-stalk sedge, longstalk sedge
  Carex pellita Muhl. ex Willd. -- accepted -- woolly sedge
  Carex pensylvanica var. lucorum (Willd. ex Link) Fernald -- not accepted
  Carex pensylvanica var. marginata (Willd.) Dewey -- not accepted
  Carex retroflexa Muhl. ex Willd. -- accepted -- reflexed sedge
  Carex riparia var. lacustris (Willd.) Kük. -- not accepted
  Carex rosea Schkuhr ex Willd. -- accepted -- rosy sedge
  Carex scoparia Schkuhr ex Willd. -- accepted -- broom sedge, pointed broom sedge
  Carex scoparia var. scoparia Schkuhr ex Willd. -- not accepted -- broom sedge
  Carex sparganioides Muhl. ex Willd. -- accepted -- bur-reed sedge, burr reed sedge
  Carex sterilis Willd. -- accepted -- dioecious sedge
  Carex stipata Muhl. ex Willd. -- accepted -- awlfruit sedge, owlfruit sedge, sawbeak sedge, stalk-grain sedge
  Carex stipata var. stipata Muhl. ex Willd. -- accepted -- owlfruit sedge
  Carex straminea Willd. ex Schkuhr -- accepted -- eastern straw sedge
  Carex supina Willd. ex Wahlenb. -- accepted -- weak arctic sedge
  Carex trichocarpa Muhl. ex Willd. -- accepted -- hairy-fruit sedge, hairyfruit sedge
  Carex umbellata Schkuhr ex Willd. -- accepted -- parasol sedge
  Carex varia Muhl. ex Willd., non Host -- not accepted
  Carex vestita Willd. -- accepted -- velvet sedge
  Carex virescens Muhl. ex Willd. -- accepted -- ribbed sedge
  Carex willdenowii Schkuhr ex Willd. -- accepted -- Willdenow's sedge
  Carex willdenowii var. willdenowii Schkuhr ex Willd. -- not accepted -- Willdenow's sedge
  Cassia laevigata Willd. -- not accepted
  Cassia pendula Humb. & Bonpl. ex Willd. -- not accepted
  Catabrosa nervata (Willd.) Link -- not accepted
  Caulinia flexilis Willd. -- not accepted
  Cedronella canariensis (L.) Willd. ex Webb & Berthel. -- accepted -- herb of Gilead
  Celosia tomentosa Willd. -- not accepted
  Celtis caucasica Willd. -- accepted -- Caucasian hackberry
  Celtis laevigata Willd. -- accepted -- sugar hackberry, sugarberry
  Celtis laevigata var. laevigata Willd. -- not accepted -- sugarberry
  Celtis occidentalis var. cordata Willd. -- not accepted
  Cenchrus rigidus Willd. -- not accepted
  Centaurea austriaca Willd. -- not accepted
  Centaurea dealbata Willd. -- accepted -- whitewash cornflower
  Centaurea macrocephala Puschk. ex Willd. -- accepted -- big yellow centaurea, big-headed knapweed, bighead knapweed
  Centaurea nervosa Willd. -- accepted -- singleflower knapweed
  Centaurea nigrescens Willd. -- accepted -- alpine knapweed, short-fringed knapweed, Tyrol knapweed, vochin knapweed
  Centaurea ovina Pall. ex Willd. -- accepted -- lilac knapweed
  Centaurea picris Pall. ex Willd. -- not accepted -- Russian knapweed
  Centaurea squarrosa Willd. -- not accepted -- squarrose knapweed
  Centaurea sulphurea Willd. -- accepted -- sulphur knapweed
  Centaurea trichocephala M. Bieb. ex Willd. -- accepted -- feather-head knapweed, feather-headed knapweed
  Centaurea uniflora ssp. nervosa (Willd.) Bonnier & Layens -- not accepted -- singleflower knapweed
  Centaurea variegata var. squarrosa (Willd.) Boiss. -- not accepted
  Centaurea virgata ssp. squarrosa (Willd.) Gugler -- accepted -- squarrose knapweed
  Centaurea virgata var. squarrosa (Willd.) Boiss. -- not accepted -- squarrose knapweed
  Centrosema sagittatum (Humb. & Bonpl. ex Willd.) Brandegee -- accepted -- arrowleaf butterfly pea
  Ceratochloa unioloides (Willd.) P. Beauv. -- not accepted
  Ceresia aristata Willd. ex Steud. -- not accepted
  Ceterach Willd. -- not accepted
  Ceterach officinarum Willd. -- not accepted
  Chaetaria canariensis (Willd.) Nees -- not accepted
  Chaetaria divaricata (Humb. & Bonpl. ex Willd.) P. Beauv. -- not accepted
  Chaetochloa crus-ardeae (Willd. ex Nees) Kuhlm. -- not accepted
  Chaetochloa imberbis var. penicillata (Willd. ex Nees) Scribn. & Merr. -- not accepted
  Chaetochloa onurus (Willd. ex Trin.) Scribn. & Merr. -- not accepted
  Chaetochloa penicillata (Willd. ex Nees) Scribn. -- not accepted
  Chaetochloa penicillata (Willd. ex Nees) Kuhlm. -- not accepted
  Chaiturus Willd. -- accepted -- lion's tail
  Chamaedorea Willd. -- accepted -- chamaedorea
  Chamaelirium Willd. -- accepted -- chamaelirium
  Chamaeraphis crus-ardeae (Willd. ex Nees) Kuntze -- not accepted
  Chamaeraphis glauca var. penicillata (Willd. ex Nees) Kuntze -- not accepted
  Chamaeraphis penicillata (Willd. ex Nees) J. Presl ex Stuck. -- not accepted
  Chamaesyce glaucescens (Willd.) V.S. Raju -- not accepted
  Chamaesyce humifusa (Willd.) Prokh. -- not accepted
  Chamaesyce vahlii (Willd. ex Klotzsch & Garcke) P. Wilson -- not accepted
  Chara globularis var. aspera (Detharding Ex Willd.) R. D. Wood -- accepted
  Cheilanthes bonariensis (Willd.) Proctor -- accepted -- golden lip fern, golden lipfern
  Chenopodium album var. lanceolatum (Muhl. ex Willd.) Coss. & Germ. -- not accepted
  Chenopodium graveolens Willd. -- not accepted -- fetid goosefoot
  Chenopodium lanceolatum Muhl. ex Willd. -- not accepted
  Chenopodium quinoa Willd. -- accepted -- quinoa
  Chloris foliosa Willd. -- not accepted
  Chloris penicillata Willd. ex Steud. -- not accepted
  Chlorocrepis tristis (Willd. ex Spreng.) A. Löve & D. Löve -- not accepted
  Chrysanthemum coccineum Willd. -- not accepted -- pyrethrum daisy
  Chrysopsis nervosa (Willd.) Fernald -- not accepted
  Cicer lens (L.) Willd. -- not accepted
  Cinna sobolifera (Muhl. ex Willd.) Link -- not accepted
  Cinna tenuiflora (Willd.) Link -- not accepted
  Cirsium discolor (Muhl. ex Willd.) Spreng. -- accepted -- field thistle
  Cirsium setosum (Willd.) Besser ex M. Bieb. -- not accepted
  Clappertonia ficifolia (Willd.) Decne. -- accepted -- bolo bolo
  Clausena anisata (Willd.) Hook. f. -- accepted
  Clausena dentata (Willd.) M. Roem. -- not accepted -- dentate clausena
  Claytonia caroliniana var. tuberosa (Pall. ex Willd.) B. Boivin -- not accepted
  Claytonia perfoliata Donn ex Willd. -- accepted -- miner's lettuce, minerslettuce
  Claytonia perfoliata ssp. perfoliata Donn ex Willd. -- accepted -- miner's lettuce
  Claytonia perfoliata ssp. perfoliata var. perfoliata Donn ex Willd. -- not accepted
  Claytonia tuberosa Pall. ex Willd. -- accepted -- tuberous springbeauty
  Claytonia tuberosa var. tuberosa Pall. ex Willd. -- not accepted -- tuberous springbeauty
  Cleome pungens auct. non Willd. -- not accepted
  Clerodendrum fragrans (Vent.) Willd. -- not accepted
  Cnemidaria grandifolia (Willd.) Proctor -- not accepted
  Cnemidaria grandifolia var. grandifolia (Willd.) Proctor -- not accepted
  Coccoloba microstachya Willd. -- accepted -- puckhout
  Cochlidium seminudum (Willd.) Maxon -- accepted -- tree snailfern
  Cochlospermum vitifolium (Willd.) Spreng. -- accepted -- silk cottontree
  Coeloglossum bracteatum (Muhl. ex Willd.) Parl. -- not accepted
  Coeloglossum viride ssp. bracteatum (Muhl. ex Willd.) Hultén -- not accepted
  Coeloglossum viride var. virescens (Muhl. ex Willd.) Luer -- not accepted -- long-bract frog orchid, longbract frog orchid
  Columnea villosa Willd. -- not accepted
  Commelina coelestis Willd. -- accepted -- commelina
  Convallaria pubescens Willd. -- not accepted
  Convolvulus tiliaceus auct. non Willd. -- not accepted -- darkeye morningglory
  Corallorhiza odontorhiza (Willd.) Nutt. -- accepted -- autumn coralroot, late coralroot
  Corallorhiza odontorhiza var. odontorhiza (Willd.) Poir. -- accepted -- autumn coralroot
  Corallorrhiza odontorhiza (Willd.) Poir. -- not accepted -- autumn coralroot
  Corallorrhiza odontorhiza var. odontorhiza (Willd.) Poir. -- not accepted -- autumn coralroot
  Cordia angustifolia (West ex Willd.) Roem. & Schult. -- not accepted -- basora
  Cordia obliqua Willd. -- accepted -- clammy cherry
  Coronilla parviflora Willd. -- not accepted
  Corydalis aurea Willd. -- accepted -- golden corydalis, scrambled eggs
  Corydalis aurea ssp. aurea Willd. -- accepted -- scrambled eggs
  Crataegus monogyna var. rosea (Willd.) K. Koch -- not accepted
  Crataegus pentagyna Waldst. & Kit. ex Willd. -- accepted
  Crotalaria orixensis Rottler ex Willd. -- accepted
  Crotalaria trifoliastrum Willd. -- accepted
  Croton albicans Willd. ex Schltdl. -- not accepted
  Croton astroites Willd. -- not accepted
  Croton dichotomus Willd. -- not accepted
  Croton dioicus Willd. -- not accepted
  Croton discolor Willd. -- accepted -- lechecillo
  Croton flavens var. mucronatus (Willd.) Müll. Arg. -- not accepted
  Croton michauxii var. elliptica (Willd.) B.W. van Ee & P.E. Berry -- accepted -- elliptic-leaf rushfoil, Willdenow's croton
  Croton moluccanus Willd. -- not accepted
  Croton montanus Willd. -- not accepted
  Croton morifolius Willd. -- accepted
  Croton morifolius var. genuinus Willd. -- not accepted
  Croton morifolius var. lanatus Willd. -- not accepted
  Croton morifolius var. morifolius Willd. -- accepted
  Croton morifolius var. obtusifolius Willd. -- not accepted
  Croton mucronatus Willd. -- not accepted
  Croton nudus Willd. ex Schltdl. -- not accepted
  Croton pulcherrimus Willd. ex Schltdl. -- not accepted
  Croton reticulatus Willd. -- not accepted
  Croton rhamnifolius Willd. -- not accepted
  Croton rhombifolius Willd. -- not accepted
  Croton richardii Willd. -- not accepted
  Croton scaber Willd. -- accepted
  Croton trilobatus Willd. -- not accepted
  Croton umbellatus Willd. -- not accepted
  Croton verbascifolius Willd. -- not accepted
  Crotonopsis argentea var. elliptica (Willd.) Pursh -- not accepted
  Crotonopsis elliptica Willd. -- not accepted
  Ctenitis ampla auct. non (Humb. & Bonpl. ex Willd.) Ching -- not accepted
  Ctenitis nemorosa (Humb. & Bonpl. ex Willd.) Ching -- accepted -- eggleaf lacefern
  Ctenitis subincisa (Willd.) Ching -- not accepted
  Cuscuta gronovii Willd. ex Schult. -- accepted -- scaldweed
  Cuscuta gronovii var. gronovii Willd. ex Schult. -- accepted -- love dodder, scaldweed
  Cusparia trifoliata (Willd.) Engl. -- not accepted
  Cyathea canaliculata Willd. -- not accepted
  Cyathea grandifolia Willd. -- accepted
  Cyathea grandifolia var. grandifolia Willd. -- accepted
  Cyathea marattioides Willd. -- accepted
  Cyathea munita Willd. ex Hook. -- accepted
  Cyathea muricata Willd. -- accepted
  Cyathea pungens (Willd.) Domin -- accepted -- spiny treefern
  Cyathea speciosa Humb. & Bonpl. ex Willd. -- accepted
  Cyathea villosa Humb. & Bonpl. ex Willd. -- accepted
  Cyclosorus interruptus (Willd.) H. Itô -- not accepted -- Neke Fern
  Cymbopogon bracteatus (Humb. & Bonpl. ex Willd.) Hitchc. -- not accepted
  Cynodon diffusus (Willd.) Raspail -- not accepted
  Cynodon occidentalis Willd. ex Steud. -- not accepted
  Cynodon portoricensis Willd. ex Steud. -- not accepted
  Cynosurus carolinianus Willd. ex Steud. -- not accepted
  Cyperus aggregatus (Willd.) Endl. -- accepted -- inflated-scale flatsedge, inflatedscale flatsedge
  Cyperus cayennensis (Lam.) Britton, non Willd. ex Link -- not accepted
  Cyperus nanus Willd. -- accepted -- Indian flatsedge
  Cyperus nanus var. nanus Willd. -- accepted -- Indian flatsedge
  Cyperus vegetus Willd. -- not accepted
  Cypripedium calceolus var. pubescens (Willd.) Correll -- not accepted
  Cypripedium candidum Muhl. ex Willd. -- accepted -- small white lady's slipper, white lady's slipper
  Cypripedium parviflorum var. pubescens (Willd.) O.W. Knight -- accepted -- greater yellow lady's slipper
  Cypripedium pubescens Willd. -- not accepted -- greater yellow lady's slipper, greater yellow lady's-slipper, hairy ladyslipper, yellow ladyslipper
  Cypripedium pubescens var. pubescens Willd. -- not accepted -- greater yellow lady's slipper
  Dactylis glaucescens Willd. -- not accepted
  Dactylis paspaloides Willd. -- not accepted
  Dactyloctenium Willd. -- accepted -- crowfoot grass, crowsfoot grass
  Dactyloctenium aegyptiacus Willd. -- not accepted
  Dactyloctenium aegyptium (L.) Willd. -- accepted -- crowfoot grass, Durban crowsfoot grass, Egyptian grass
  Dactyloctenium mucronatum (Michx.) Willd. -- not accepted
  Dalea alopecuroides Willd. -- not accepted
  Dalea bicolor Humb. & Bonpl. ex Willd. -- accepted -- silver prairie clover, silver prairieclover
  Dalea bicolor var. bicolor Humb. & Bonpl. ex Willd. -- accepted
  Dalea candida Michx. ex Willd. -- accepted -- slender white prairieclover, white dalea, white prairie clover, white prairie-clover, white prairieclover
  Dalea candida var. candida Michx. ex Willd. -- accepted -- white prairie clover, white prairie-clover, white prairieclover
  Dalea cliffortiana Willd. -- accepted
  Dalea lagopus (Cav.) Willd. -- not accepted
  Dasiphora fruticosa ssp. tenuifolia (Willd. ex Schltdl.) Rydb. -- not accepted
  Dasyochloa Willd. ex Rydb. -- accepted -- woollygrass
  Dasyochloa avenacea (Kunth) Willd. ex Steud. -- not accepted
  Dasyochloa pulchella (Kunth) Willd. ex Rydb. -- accepted -- fluffgrass, low woollygrass
  Dasyochloa pulchella Willd. ex Steud. -- not accepted
  Datura suaveolens Humb. & Bonpl. ex Willd. -- not accepted
  Dennstaedtia adiantoides (Humb. & Bonpl. ex Willd.) T. Moore -- not accepted
  Dennstaedtia obtusifolia (Willd.) T. Moore -- accepted -- bluntleaf hayscented fern
  Dentaria laciniata Muhl. ex Willd. -- not accepted
  Derris uliginosa (Willd.) Benth. -- not accepted
  Deschampsia pulchella (Willd.) Trin. -- not accepted
  Desmanthus Willd. -- accepted -- bundleflower
  Desmanthus depressus Humb. & Bonpl. ex Willd. -- not accepted
  Desmanthus virgatus (L.) Willd. -- accepted -- wild tantan
  Desmanthus virgatus var. depressus (Humb. & Bonpl. ex Willd.) B.L. Turner -- not accepted -- wild tantan
  Desmanthus virgatus var. virgatus (L.) Willd. -- not accepted -- wild tantan
  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 cuspidatum (Muhl. ex Willd.) Loudon -- accepted -- largebract ticktrefoil
  Desmodium cuspidatum var. cuspidatum (Muhl. ex Willd.) Loudon -- accepted -- largebract ticktrefoil
  Desmodium glutinosum (Muhl. ex Willd.) Alph. Wood -- accepted -- largeflower tickclover, pointedleaf ticktrefoil, trefoil tickclover
  Desmodium heterophyllum (Willd.) DC. -- accepted -- Spanish clover, variable-leaf ticktrefoil
  Desmodium obtusum (Muhl. ex Willd.) DC. -- accepted -- stiff tickclover, stiff ticktrefoil
  Deyeuxia confinis (Willd.) Kunth -- not accepted
  Deyeuxia retrofracta (Willd.) Kunth -- not accepted
  Dialium guineense Willd. -- accepted -- velvet tamarind
  Dianthus repens Willd. -- accepted -- boreal carnation
  Dichondra argentea Humb. & Bonpl. ex Willd. -- accepted -- silver pony's-foot, silver ponysfoot
  Dicranopteris bifida (Willd.) Maxon -- not accepted
  Dicranopteris pectinata (Willd.) Underw. -- accepted -- comb forkedfern
  Digitaria barbata Willd. -- not accepted
  Digitaria biformis Willd. -- not accepted
  Digitaria biformis var. biformis Willd. -- not accepted
  Digitaria debilis (Desf.) Willd. -- accepted
  Digitaria didactyla Willd. -- accepted -- crabgrass
  Digitaria horizontalis Willd. -- accepted -- Jamaican crabgrass
  Digitaria praecox (Walter) Willd. -- not accepted
  Digitaria sanguinalis f. barbata (Willd.) Mez ex Henrard -- not accepted
  Digitaria sanguinalis var. horizontalis (Willd.) Rendle -- not accepted
  Dinebra paspaloides (Willd.) P. Beauv. -- not accepted
  Diodella apiculata (Willd. & Roem. & Schult.) Delprete -- accepted
  Diodella radula (Willd. ex Roem. & Schult.) Delprete -- accepted
  Diodella rigida (Willd. ex Roem. & Schult.) Small -- not accepted
  Diodia apiculata (Willd. ex Roem. & Schult.) K. Schum. -- not accepted -- stiff buttonweed
  Diodia ocymifolia (Willd. ex Roem. & Schult.) Bremek. -- not accepted -- slender buttonweed
  Diodia radula (Willd. ex Roem. & Schult.) Cham. & Schltdl. -- not accepted -- rough buttonweed
  Diodia rigida (Willd. ex Roem. & Schult.) Cham. & Schltdl. -- not accepted
  Dioscorea polygonoides Humb. & Bonpl. ex Willd. -- accepted -- mata gallina
  Diospyros discolor Willd. -- not accepted
  Diospyros ferrea (Willd.) Bakh. -- accepted
  Diospyros ferrea auct. non (Willd.) Bakh. -- not accepted
  Diospyros ferrea var. ferrea (Willd.) Bakh. -- not accepted
  Diphasiastrum sabinifolium (Willd.) Holub -- not accepted -- savinleaf groundpine
  Diphasiastrum X sabinifolium (Willd.) Holub (pro sp.) -- not accepted -- savinleaf groundpine
  Diplazium arboreum auct. non (Willd.) C. Presl -- not accepted
  Diplazium expansa Willd. -- not accepted
  Diplazium expansum Willd. -- accepted -- great fern
  Diplazium limbatum (Willd.) Proctor -- not accepted
  Dipteryx odorata (Aubl.) Willd. -- accepted -- tonka bean
  Dipteryx oppositifolia (Aubl.) Willd. -- not accepted
  Doellingeria humilis (Willd.) Britton -- not accepted
  Dolichos angularis Willd. -- not accepted
  Dolichos falcatus Klein ex Willd. -- not accepted
  Dolichos lobatus Willd. -- not accepted
  Donax festucaceus (Willd.) P. Beauv. -- not accepted
  Drimia Jacq. ex Willd. -- accepted
  Drymaria Willd. ex Schult. -- accepted -- drymary
  Drymaria cordata (L.) Willd. ex Schult. -- accepted -- chickweed, whitesnow
  Drymaria cordata ssp. cordata (L.) Willd. ex Schult. -- not accepted -- whitesnow
  Drymaria cordata var. cordata (L.) Willd. ex Schult. -- not accepted -- whitesnow
  Dryopteris ampla auct. non (Humb. & Bonpl. ex Willd.) Kuntze -- not accepted
  Dryopteris angustifolia (Willd.) Urb. -- not accepted
  Dryopteris austriaca var. intermedia (Muhl. ex Willd.) C.V. Morton -- not accepted
  Dryopteris intermedia (Muhl. ex Willd.) A. Gray -- accepted -- intermediate woodfern
  Dryopteris nemorosa (Humb. & Bonpl. ex Willd.) Urb. -- not accepted
  Dryopteris spinulosa var. intermedia (Muhl. ex Willd.) Underw. -- not accepted
  Dryopteris subincisa (Willd.) Urb. -- not accepted
  Dysphania graveolens (Willd.) Mosyakin & Clemants -- accepted -- fetid goosefoot
  Echinochloa crus-galli f. echinata (Willd.) Moramiu -- not accepted
  Echinochloa crus-galli var. echinata (Willd.) Honda -- not accepted
  Echinochloa crus-galli var. echinatum (Willd.) Honda -- not accepted
  Echinochloa crus-galli var. echinatum (Willd.) A. Chev. -- not accepted
  Echinochloa echinata (Willd.) P. Beauv. -- not accepted
  Eleocharis obtusa (Willd.) Schult. -- accepted -- blunt spikerush, blunt spikesedge
  Eleocharis ovata var. obtusa (Willd.) Kük. -- not accepted
  Eleocharis tenuis (Willd.) Schult. -- accepted -- slender spikerush
  Eleocharis tenuis var. tenuis (Willd.) Schult. -- accepted -- slender spikerush
  Eleusine digitata Willd. ex Steud. -- not accepted
  Eleusine elongata Willd. ex Steud. -- not accepted
  Eleusine stricta Willd. ex Steud. -- not accepted
  Eleusine unioloides Willd. ex Steud. -- not accepted
  Elionurus Humb. & Bonpl. ex Willd. -- accepted -- balsamscale grass
  Elionurus tripsacoides Humb. & Bonpl. ex Willd. -- accepted -- Pan American balsamscale
  Elionurus tripsacoides var. tripsacoides Humb. & Bonpl. ex Willd. -- not accepted
  Elsholtzia Willd. -- accepted
  Elsholtzia cristata Willd. -- not accepted
  Elymus canadensis f. glaucifolius (Willd.) Fernald -- not accepted
  Elymus canadensis var. glaucifolius (Willd.) Torr. -- not accepted
  Elymus canadensis var. villosus (Muhl. ex Willd.) Shinners -- not accepted
  Elymus glaucifolius Willd. -- not accepted
  Elymus striatus Willd. -- not accepted
  Elymus striatus var. villosus (Muhl. ex Willd.) A. Gray -- not accepted
  Elymus villosus Muhl. ex Willd. -- accepted -- élyme velu, hairy wild rye, hairy wildrye, slender wild-rye
  Elymus villosus f. villosus Muhl. ex Willd. -- not accepted
  Elymus villosus var. villosus Muhl. ex Willd. -- accepted
  Elymus virginicus ssp. villosus (Muhl. ex Willd.) Á. Löve -- not accepted
  Elyonurus Kunth & Bonpl. ex Willd. -- not accepted -- balsamscale
  Elyonurus tripsacoides Humb. & Bonpl. ex Willd. -- not accepted
  Elyonurus tripsacoides var. tripsacoides Humb. & Bonpl. ex Willd. -- not accepted
  Empetrum rubrum Vahl ex Willd. -- accepted
  Encephalartos tridentatus (Willd.) Lehm. -- not accepted
  Eragrostis elongata (Willd.) J. Jacq. -- accepted -- long lovegrass
  Eremopyrum patulum (Willd.) P. Candargy -- not accepted
  Eremopyrum sibiricum (Willd.) P. Candargy -- not accepted
  Erianthus repens (Willd.) P. Beauv. -- not accepted
  Erigeron annuus ssp. strigosus (Muhl. ex Willd.) Wagenitz -- not accepted
  Erigeron bellidifolius Muhl. ex Willd. -- not accepted
  Erigeron linifolius Willd. -- not accepted
  Erigeron strigosus Muhl. ex Willd. -- accepted -- daisy fleabane, prairie fleabane, rough fleabane
  Erigeron strigosus var. strigosus Muhl. ex Willd. -- accepted -- Beyrich's fleabane, prairie fleabane
  Erodium laciniatum (Cav.) Willd. -- accepted -- cutleaf stork's bill
  Erodium stephanianum Willd. -- accepted -- Stephen's stork's bill
  Erodium stephenianum Willd. -- not accepted -- Stephen's stork's bill
  Erucastrum gallicum (Willd.) O.E. Schulz -- accepted -- common dog-mustard, common dogmustard
  Erythrina glauca Willd. -- not accepted
  Esula provincialis (Willd.) Haw. -- not accepted
  Euchiton sphaericus (Willd.) Anderb. -- accepted -- tropical creeping cudweed
  Eugenia axillaris (Sw.) Willd. -- accepted -- white stopper
  Eugenia buxifolia (Sw.) Willd. -- not accepted
  Eugenia floribunda West ex Willd. -- not accepted
  Eugenia ligustrina (Sw.) Willd. -- accepted -- privet stopper
  Eupatoriadelphus dubius (Willd. ex Poir.) King & H. Rob. -- not accepted
  Eupatorium cuneifolium Willd. -- not accepted
  Eupatorium dubium Willd. ex Poir. -- not accepted -- coastalplain joepyeweed
  Eupatorium perfoliatum var. truncatum (Muhl. ex Willd.) A. Gray -- not accepted
  Eupatorium pubescens Muhl. ex Willd. -- not accepted
  Eupatorium X truncatum Muhl. ex Willd. (pro sp.) -- not accepted -- eupatorium
  Euphorbia agrorum Willd. ex Ledeb. -- not accepted
  Euphorbia ambigua Waldst. & Kit. ex Willd. -- not accepted
  Euphorbia androsaemifolia Willd. ex Schlecht. -- accepted
  Euphorbia aphylla Brouss. ex Willd. -- accepted
  Euphorbia arenaria Willd. ex Ledeb. -- not accepted
  Euphorbia ascendens Willd. ex Boiss. -- not accepted
  Euphorbia atropurpurea Brouss. ex Willd. -- accepted
  Euphorbia atropurpurea f. atropurpurea Brouss. ex Willd. -- accepted
  Euphorbia biglandulosa Willd. -- not accepted
  Euphorbia broussonetii Willd. ex Link -- not accepted
  Euphorbia bupleuroides Willd. ex Boiss. -- not accepted
  Euphorbia bupleuroides Willd. ex Ledeb. -- not accepted
  Euphorbia carniolica var. ambigua (Waldst. & Kit. ex Willd.) Nyman -- not accepted
  Euphorbia characias ssp. veneta (Willd.) Litard. -- not accepted
  Euphorbia coccinea Willd. ex Boiss. -- not accepted
  Euphorbia collina Willd. ex Ledeb. -- not accepted
  Euphorbia congesta Willd. -- not accepted
  Euphorbia crispata Willd. ex Hornem. -- not accepted
  Euphorbia decumbens (Forssk.) Willd. -- not accepted
  Euphorbia diversifolia Willd. ex Boiss. -- not accepted
  Euphorbia erosa Willd. -- not accepted
  Euphorbia havanensis Willd. ex Boiss. -- not accepted
  Euphorbia hernariifolia Willd. -- not accepted
  Euphorbia herniarifolia Willd. -- not accepted -- herniaria-leaf spurge
  Euphorbia herniariifolia Willd. -- accepted -- herniaria-leaf spurge
  Euphorbia herniariifolia var. herniariifolia Willd. -- accepted
  Euphorbia hirsuta f. crispata (Willd. ex Hornem.) Oudejans -- not accepted
  Euphorbia humboldtii Willd. -- not accepted
  Euphorbia humifusa Willd. -- accepted
  Euphorbia linarifolia Willd. -- not accepted
  Euphorbia maritima Willd. ex Boiss. -- not accepted
  Euphorbia micrantha Stephan ex Willd. -- not accepted
  Euphorbia multiflora Willd. ex Klotzsch -- not accepted
  Euphorbia nummulariifolia Willd. -- not accepted
  Euphorbia odontophylla Willd. -- not accepted
  Euphorbia officinarum var. kolquall Willd. -- not accepted
  Euphorbia pallida Willd. -- not accepted
  Euphorbia peplus var. minor Willd. -- not accepted
  Euphorbia pilosa ssp. villosa (Waldst. & Kit. ex Willd.) Nyman -- not accepted
  Euphorbia pilosa var. villosa (Waldst. & Kit. ex Willd.) Nyman -- not accepted
  Euphorbia pinifolia Willd. -- not accepted
  Euphorbia provincialis Willd. -- not accepted
  Euphorbia pubescens var. crispata (Willd. ex Hornem.) Boiss. -- not accepted
  Euphorbia pulcherrima Willd. ex Klotzsch -- accepted -- flor de pascua, nochebuena, poinsettia
  Euphorbia rhombea Willd. ex Link -- not accepted
  Euphorbia salina Willd. ex Boiss. -- not accepted
  Euphorbia squamosa Willd. -- accepted
  Euphorbia stellata Willd. -- accepted
  Euphorbia stricta ssp. micrantha (Stephan ex Willd.) Nyman -- not accepted
  Euphorbia triphylla Willd. ex Klotzsch & Garcke -- not accepted
  Euphorbia veneta Willd. -- not accepted
  Euphorbia villosa Waldst. & Kit. ex Willd. -- not accepted
  Euphorbia virosa Willd. -- accepted
  Euphorbia virosa ssp. virosa Willd. -- accepted
  Eutrochium dubium (Willd. ex Poir.) E.E. Lamont -- accepted -- coastal plain joepyeweed
  Evolvulus alsinoides var. acapulcensis (Willd.) Ooststr. -- not accepted
  Evolvulus convolvuloides (Willd. ex Schult.) Stearn -- accepted -- bindweed dwarf morning-glory
  Festuca flexuosa Willd. ex Kunth -- not accepted
  Festuca livida (Kunth) Willd. ex Spreng. -- accepted
  Festuca mexicana Willd. -- not accepted
  Festuca obtusiflora Willd. ex Spreng. -- not accepted
  Festuca octoflora var. tenella (Willd.) Fernald -- not accepted
  Festuca orgyalis Willd. ex E. Fourn. -- not accepted
  Festuca orgyalis Willd. ex Spreng. -- not accepted
  Festuca quitensis Willd. ex Kunth -- not accepted
  Festuca quitensis Willd. ex Nees -- not accepted
  Festuca racemosa Willd. ex Spreng. -- not accepted
  Festuca scabra Willd. ex Steud. -- not accepted
  Festuca tenella Willd. -- not accepted
  Festuca unioloides Willd. -- not accepted
  Ficus crassinervia Desf. ex Willd. -- not accepted
  Flacourtia cataphracta Roxb. ex Willd. -- not accepted
  Floerkea Willd. -- accepted
  Floerkea proserpinacoides Willd. -- accepted -- false mermaid-weed, false mermaidweed, floerkée fausse-proserpinie
  Flueggea Willd. -- accepted -- bushweed
  Flueggea virosa (Roxb. ex Willd.) Royle -- accepted -- common bushweed
  Flueggea virosa (Roxb. ex Willd.) Baill. -- not accepted -- Chinese waterberry, simpleleaf bushweed
  Fluggea Willd. -- not accepted
  Fluggea virosa (Roxb. ex Willd.) Baill. -- not accepted
  Fluminia festucacea (Willd.) Hitchc. -- not accepted
  Fouquieria fasciculata (Willd. ex Roem. & Schult.) Nash -- accepted
  Galarhoeus micranthus (Stephan ex Willd.) Haw. -- not accepted
  Galarhoeus villosus (Waldst. & Kit. ex Willd.) Prokh. -- not accepted
  Gamochaeta coarctata (Willd.) Kerguélen -- accepted -- gray everlasting
  Gamochaeta pennsylvanica (Willd.) Cabrera -- not accepted
  Gamochaeta pensylvanica (Willd.) Cabrera -- accepted -- Pennsylvania everlasting
  Gamochaeta simplicicaulis (Willd. ex Spreng.) Cabrera -- accepted -- simple-stem everlasting
  Geranium pilosum Sol. ex Willd. -- not accepted
  Gesneria velutina Willd. ex DC. -- not accepted
  Geum macrophyllum Willd. -- accepted -- large-leaf avens, largeleaf avens
  Geum macrophyllum var. macrophyllum Willd. -- accepted -- largeleaf avens
  Gigantochloa verticillata (Willd.) Munro -- accepted -- gigantochloa
  Gillenia stipulata (Muhl. ex Willd.) Nutt. -- accepted -- American ipecac, Indian physic
  Gleichenia bifida (Willd.) Spreng. -- not accepted
  Gleichenia pectinata (Willd.) C. Presl -- not accepted
  Glyceria aquatica ssp. nervata (Willd.) Douin -- not accepted
  Glyceria nervata (Willd.) Trin. -- not accepted
  Glycine Willd. -- accepted -- soybean
  Glycosmis citrifolia (Willd.) Lindl. -- not accepted
  Gnaphalium pensylvanicum Willd. -- not accepted
  Goodyera pubescens (Willd.) R. Br. -- accepted -- downy rattlesnake-plantain, goodyérie pubescente
  Grammica gronovii (Willd. ex Schult.) Hadac & Chrtek -- not accepted
  Grammitis cultrata (Willd.) Proctor -- accepted -- scaly dwarf polypody
  Grammitis seminuda (Willd.) Willd. -- not accepted
  Graphephorum festucaceum (Willd.) A. Gray -- not accepted
  Grewia villosa Willd. -- accepted
  Grindelia Willd. -- accepted -- gumweed
  Gymnopogon foliosus (Willd.) Nees -- accepted -- leafy skeletongrass
  Gynerium Willd. ex P. Beauv. -- accepted -- wildcane
  Habenaria Willd. -- accepted -- bog orchid
  Habenaria blephariglottis (Willd.) Hook. -- not accepted
  Habenaria bracteata (Muhl. ex Willd.) R. Br. -- not accepted
  Habenaria macroceratitis Willd. -- not accepted -- big-horn bog orchid
  Habenaria quinqueseta var. macroceratitis (Willd.) Luer -- accepted -- longhorn false reinorchid
  Hainardia cylindrica (Willd.) Greuter -- accepted -- barbgrass
  Haworthiopsis fasciata (Willd.) G.D. Rowley -- accepted
  Hedera canariensis Willd. -- not accepted -- Canary ivy
  Hedera helix ssp. canariensis (Willd.) Cout. -- not accepted -- Algerian ivy
  Hedyotis canadensis (Willd. ex Roem. & Schult.) Fosberg -- not accepted
  Hedysarum gemellum Willd. ex Vogel (pro. syn.) -- not accepted
  Hedysarum tauricum Pall. ex Willd. -- accepted
  Hedysarum varium Willd. -- accepted
  Hemidiodia ocymifolia (Willd. ex Roem. & Schult.) K. Schum. -- not accepted
  Hemitelia grandifolia (Willd.) Spreng. -- not accepted
  Hemitelia muricata (Willd.) Fée -- not accepted
  Heteranthera limosa (Sw.) Willd. -- accepted -- blue mudplantain, ducksalad, mud plantain
  Heteropappus altaicus (Willd.) Novopokr. -- accepted
  Heteropogon contortus subvar. secundus (Willd. ex Nees) Domin -- not accepted
  Heterotheca nervosa (Willd.) Shinners -- not accepted
  Heuchera glabra Willd. ex Roem. & Schult. -- accepted -- alpine alumroot, alpine heuchera
  Hevea brasiliensis (Willd. ex A. Juss.) Müll. Arg. -- accepted -- rubber tree
  Hibiscus lunariifolius Willd. -- accepted -- hibiscus
  Hieracium flagellare Willd. -- accepted -- hawkweed
  Hieracium laevigatum Willd. -- not accepted -- smooth hawkweed
  Hieracium marianum Willd. -- accepted -- Maryland hawkweed
  Hieracium triste Willd. ex Spreng. -- accepted -- low alpine hawkweed, slender hawkweed, woolly hawkweed
  Hieracium triste var. triste Willd. ex Spreng. -- not accepted -- woolly hawkweed
  Hieracium X flagellare Willd. (pro sp.) -- not accepted -- hawkweed
  Hieracium X flagellare var. flagellare Willd. -- not accepted
  Hieracium X marianum Willd. (pro sp.) -- not accepted -- hawkweed
  Hierochloe alpina (Sw. ex Willd.) Roem. & Schult. -- not accepted -- alpine sweetgrass
  Hierochloe alpina f. alpina (Sw. ex Willd.) Roem. & Schult. -- not accepted
  Hierochloe alpina ssp. alpina (Sw. ex Willd.) Roem. & Schult. -- not accepted -- alpine sweetgrass
  Hierochloe alpina var. alpina (Sw. ex Willd.) Roem. & Schult. -- not accepted
  Hierochloe fragrans (Willd.) Roem. & Schult. -- not accepted
  Hierochloe odorata var. fragrans (Willd.) K. Richt. -- not accepted
  Holcus alpinus Sw. ex Willd. -- not accepted
  Holcus avenaceus var. bulbosus (Willd.) Gaudin -- not accepted
  Holcus bulbosus (Willd.) Schrad. -- not accepted
  Holcus fragrans Willd. -- not accepted
  Homalocenchrus virginicus (Willd.) Britton -- not accepted
  Hordeum striatum (Willd.) Schenck -- not accepted
  Hordeum villosum (Muhl. ex Willd.) Schenck -- not accepted
  Horsfieldia Willd. -- accepted
  Houstonia canadensis Willd. ex Roem. & Schult. -- accepted -- Canadian summer bluet
  Hydrocleys hymphoides (Willd) Buchenau -- not accepted
  Hydrocleys nymphoides (Willd.) Buchenau -- accepted -- waterpoppy
  Hydroglossum Willd. -- not accepted
  Hydromystria laevigata (Humb. & Bonpl. ex Willd.) Hunz. -- not accepted
  Hydrophila vaillantii sensu House non (Willd.) Roth -- not accepted
  Hydropoa nervata (Willd.) Dumort. -- not accepted
  Hymenachne auriculata (Willd. ex Spreng.) Chase -- not accepted
  Hyparrhenia bracteata (Humb. & Bonpl. ex Willd.) Stapf -- accepted
  Hypericum aspalathoides Willd. -- not accepted
  Hypericum hypericoides ssp. multicaule (Michx. ex Willd.) N. Robson -- accepted -- St. Andrew's cross
  Hypericum hypericoides var. multicaule (Michx. ex Willd.) Fosberg -- not accepted
  Hypericum mutilum var. parviflorum (Willd.) Fernald -- not accepted
  Hypericum nudiflorum Michx. ex Willd. -- accepted -- early St. Johnswort, naked St. Johnswort
  Hyptis radiata Willd. -- not accepted
  Iberis carnosa Willd. -- accepted -- Pruit's candytuft
  Ilex verticillata var. padifolia (Willd.) Torr. & A. Gray ex S. Watson -- not accepted
  Indigofera australis Willd. -- accepted -- Australian indigo
  Indigofera echinata Willd. -- not accepted
  Inga fagifolia (L.) Willd. ex Benth. -- not accepted
  Inga fastuosa (Jacq.) Willd. -- accepted
  Inga ingoides (Rich.) Willd. -- accepted -- icecream bean
  Inga laurina (Sw.) Willd. -- accepted -- sacky sac bean
  Inga nobilis Willd. -- accepted -- guama venezolano
  Inga sapindoides Willd. -- accepted
  Inga vera Willd. -- accepted -- river koko
  Ipomoea dumetorum Willd. ex Roem. & Schult. -- accepted -- railwaycreeper
  Ipomoea tiliacea (Willd.) Choisy -- accepted
  Ipomoea tiliacea auct. non (Willd.) Choisy -- not accepted -- darkeye morningglory
  Iresine canescens Humb. & Bonpl. ex Willd. -- not accepted
  Iresine diffusa Humb. & Bonpl. ex Willd. -- accepted -- Juba's bush
  Iresine elatior A. Rich. ex Willd. -- not accepted
  Iresine elongata Humb. & Bonpl. ex Willd. -- not accepted
  Iresine flavescens Humb. & Bonpl. ex Willd. -- accepted -- yellow bloodleaf
  Ischaemum hispidum (Humb. & Bonpl. ex Willd.) Kunth -- not accepted
  Isotria verticillata (Muhl. ex Willd.) Raf. -- accepted -- large whorled pogonia, purple fiveleaf orchid
  Iva ciliata Willd. -- not accepted
  Jarava arundinacea Willd. ex Steud. -- not accepted
  Jasminum elongatum (P.J. Bergius) Willd. -- accepted -- earleaf jasmine
  Jasminum pubescens (Retz.) Willd. -- not accepted
  Juncus arcticus Willd. -- accepted -- Arctic rush
  Juncus arcticus ssp. arcticus Willd. -- not accepted -- Arctic rush
  Juncus arcticus ssp. balticus (Willd.) Hyl. -- not accepted
  Juncus arcticus var. arcticus Willd. -- accepted -- Arctic rush
  Juncus arcticus var. balticus (Willd.) Trautv. -- not accepted
  Juncus arcticus var. mexicanus (Willd. ex Schult. & Schult. f.) Balslev -- not accepted -- Mexican rush
  Juncus balticus Willd. -- accepted -- Baltic rush
  Juncus balticus ssp. balticus Willd. -- accepted -- Baltic rush
  Juncus balticus ssp. mexicanus (Willd. ex Schult. & Schult. f.) Snogerup -- accepted -- Mexican rush
  Juncus balticus var. balticus Willd. -- not accepted -- Baltic rush
  Juncus balticus var. mexicanus (Willd. ex Schult. & Schult. f.) Kuntze -- not accepted
  Juncus mexicanus Willd. ex Schult. & Schult. f. -- not accepted -- Mexican rush
  Juncus tenuis Willd. -- accepted -- field rush, path rush, poverty rush, slender rush, slender yard rush, wiregrass
  Juncus tenuis var. tenuis Willd. -- not accepted -- poverty rush
  Juniperus communis ssp. nana (Willd.) Syme -- not accepted
  Juniperus foetidissima Willd. -- accepted -- stinking juniper
  Juniperus nana Willd. -- not accepted
  Jussiaea scabra Willd. -- not accepted
  Kanopikon atropurpureum (Brouss. ex Willd.) Raf. -- not accepted
  Keraselma pallida (Willd.) Raf. -- not accepted
  Keraselma provincialis (Willd.) Raf. -- not accepted
  Keraselma squamosa (Willd.) Raf. -- not accepted
  Kobresia Willd. -- accepted -- bog sedge
  Krameria erecta Willd. ex Schult. & Schult. f. -- accepted -- littleleaf ratany, range ratany
  Kraunhia floribunda (Willd.) Taub. -- not accepted
  Krigia virginica (L.) Willd. -- accepted -- Virginia dwarfdandelion
  Lachnagrostis retrofracta (Willd.) Trin. -- not accepted
  Lacinaria graminifolia (Willd.) Kuntze -- not accepted
  Lagotis glauca ssp. minor (Willd.) Hultén -- not accepted
  Lagotis minor (Willd.) Standl. -- not accepted -- little weaselsnout
  Lamium purpureum var. incisum (Willd.) Pers. -- accepted -- hybrid deadnettle, purple deadnettle, red deadnettle
  Lampranthus roseus (Willd.) Schwantes -- accepted
  Lathyrus japonicus Willd. -- accepted -- beach pea
  Lathyrus japonicus var. japonicus Willd. -- accepted -- beach pea
  Lathyrus myrtifolius Muhl. ex Willd. -- not accepted
  Lathyrus palustris var. myrtifolius (Muhl. ex Willd.) A. Gray -- not accepted
  Lathyrus venosus Muhl. ex Willd. -- accepted -- bushy vetchling, veiny pea, veiny peavine
  Lathyrus venosus var. venosus Muhl. ex Willd. -- accepted -- veiny pea
  Leersia asperrima Willd. ex Trin. -- not accepted
  Leersia elongata Willd. ex Trin. -- not accepted
  Leersia gracilis Willd. ex Trin. -- not accepted
  Leersia oryzoides var. virginica (Willd.) Poir. -- not accepted
  Leersia virginica Willd. -- accepted -- white grass, whitegrass
  Leersia virginica var. virginica Willd. -- accepted
  Lepechinia Willd. -- accepted -- pitchersage
  Lepidagathis Willd. -- accepted
  Lepidaploa glabra (Willd.) H. Rob. -- accepted -- Santa Maria
  Lepidium apetalum Willd. -- accepted
  Leptilon linifolium (Willd.) Small -- not accepted
  Leptopogon furcatus (Muhl. ex Willd.) Roberty -- not accepted
  Lepturus cylindricus (Willd.) Trin. -- not accepted
  Lepturus cylindricus var. cylindricus (Willd.) Trin. -- not accepted
  Leucothoe walteri (Willd.) N.C. Melvin -- not accepted
  Liatris graminifolia Willd. -- not accepted
  Liatris graminifolia var. graminifolia Willd. -- not accepted -- grassleaf gayfeather
  Liatris pilosa (Aiton) Willd. -- accepted -- shaggy blazing star
  Liatris pilosa var. pilosa (Aiton) Willd. -- not accepted -- shaggy blazing star
  Liatris scariosa (L.) Willd. -- accepted -- devil's bite
  Liatris scariosa var. scariosa (L.) Willd. -- accepted -- devil's bite, Virginia blazing star
  Liatris spicata (L.) Willd. -- accepted -- dense blazing star
  Liatris spicata var. spicata (L.) Willd. -- accepted -- dense blazing star
  Limnia perfoliata (Donn ex Willd.) Haw. -- not accepted
  Limnobium laevigatum (Humb. & Bonpl. ex Willd.) Heine -- accepted -- West Indian spongeplant
  Limnobium spongia ssp. laevigatum (Humb. & Bonpl. ex Willd.) Lowden -- not accepted
  Linaria bipartita (Vent.) Willd. -- accepted -- clovenlip toadflax
  Liparis odorata (Willd.) Lindl. -- accepted
  Lobelia fulgens Humb. & Bonpl. ex Willd. -- not accepted
  Lobelia splendens Humb. & Bonpl. ex Willd. -- not accepted
  Lolium cylindricum (Willd.) Asch. ex Graebn. -- not accepted
  Lolium maximum Willd. -- not accepted
  Lolium perenne var. aristatum Willd. -- not accepted
  Lomaria Willd. -- not accepted
  Lotus palustris Willd. -- accepted
  Lotus tenuis Waldst. & Kit. ex Willd. -- accepted -- narrowleaf bird's-foot trefoil, narrowleaf birdsfoot trefoil
  Ludolfia Willd. -- not accepted
  Ludolfia glaucescens Willd. -- not accepted
  Ludolfia macrosperma (Michx.) Willd. -- not accepted
  Ludolphia Willd. -- not accepted
  Ludolphia glaucescens Willd. -- not accepted
  Luehea Willd. -- accepted
  Luehea speciosa Willd. -- accepted -- luehea
  Lupinus villosus Willd. -- accepted -- lady lupine
  Luzula pilosa (L.) Willd. -- accepted
  Luzula sudetica (Willd.) Schult. -- accepted
  Luzula sudetica auct. non (Willd.) DC. -- not accepted -- Sudetic Mountain woodrush
  Lycopodium sabinaefolium Willd. -- not accepted -- savinleaf groundpine
  Lycopodium sabinifolium Willd. -- accepted -- purple loosestrife, savinleaf groundpine
  Lycopodium X sabinifolium Willd. (pro sp.) -- not accepted
  Lygodium auriculatum (Willd.) Alston -- accepted
  Macleaya cordata (Willd.) R. Br. -- accepted -- plume poppy
  Macroptilium heterophyllum (Willd.) Maréchal & Baudet -- not accepted
  Mallotus rhamnifolius (Willd.) Müll. Arg. -- accepted
  Malus prunifolia (Willd.) Borkh. -- accepted -- plumleaf crab apple, plumleaf crabapple
  Matteuccia pensylvanica (Willd.) Raymond -- not accepted
  Matteuccia struthiopteris var. pensylvanica (Willd.) C.V. Morton -- accepted -- ostrich fern
  Maurandella antirrhiniflora (Humb. & Bonpl. ex Willd.) Rothm. -- accepted -- climbing snapdragon, roving sailor
  Maurandya antirrhiniflora Humb. & Bonpl. ex Willd. -- not accepted
  Medicago aculeata Willd. -- not accepted
  Medicago apiculata Willd. -- not accepted
  Medicago denticulata Willd. -- not accepted
  Medicago granadensis Willd. -- accepted
  Medicago hispida var. apiculata (Willd.) Burnat -- not accepted
  Medicago murex Willd. -- accepted
  Medicago orbicularis var. marginata (Willd.) Benth. -- not accepted
  Medicago polycarpa Willd. -- not accepted
  Medicago polymorpha f. apiculata (Willd.) Shinners -- not accepted
  Medicago tuberculata (Retz.) Willd. -- not accepted
  Megalastrum subincisa (Willd.) A.R. Sm. & R.C. Moran -- not accepted
  Megalastrum subincisum (Willd.) A.R. Sm. & R.C. Moran -- accepted -- jagleaf junglefern
  Meibomia ciliaris (Muhl. ex Willd.) S.F. Blake -- not accepted
  Meibomia obtusa (Muhl. ex Willd.) Vail -- not accepted
  Melinis repens (Willd.) Zizka -- accepted -- rose Natal grass
  Melinis repens ssp. repens (Willd.) Zizka -- not accepted
  Mentha longifolia var. undulata (Willd.) Fiori -- not accepted
  Mentha nemorosa Willd. -- not accepted
  Metroxylon rumphii (Willd.) Mart. -- not accepted
  Micranthes davurica (Willd.) Sm. -- accepted
  Micranthes hieraciifolia (Waldst. & Kit. ex Willd.) Haw. -- accepted -- hawkweed-leaved saxifrage, stiffstem saxifrage
  Mikania Willd. -- accepted -- hempvine, mikania
  Mikania cordifolia (L. f.) Willd. -- accepted -- Florida Keys hempvine
  Mikania scandens (L.) Willd. -- accepted -- climbing hempvine, climbing hempweed
  Mimosa arenosa (Willd.) Poir. -- accepted -- elegant mimosa
  Mimosa pellita Humb. & Bonpl. ex Willd. -- not accepted -- lollipop mimosa
  Minuartia sajanensis auct. non (Willd. ex Schltdl.) House -- not accepted
  Mitracarpus frigidus (Willd. ex Roem. & Schult.) K. Schum. -- accepted -- frigid girdlepod
  Momordica dioica Roxb. ex Willd. -- accepted -- balsampear
  Monarda media Willd. -- accepted -- purple bergamot
  Monerma cylindrica (Willd.) Coss. & Durieu -- not accepted
  Montia perfoliata (Donn ex Willd.) Howell -- not accepted -- miner's lettuce
  Morongia uncinata (Willd.) Britton -- not accepted
  Mucuna gigantea (Willd.) DC. -- accepted -- seabean
  Muhlenbergia cenchroides (Humb. & Bonpl. ex Willd.) P.M. Peterson -- accepted
  Muhlenbergia diffusa Willd. -- not accepted
  Muhlenbergia glomerata (Willd.) Trin. -- accepted -- bristly muhly, marsh muhly, spiked muhly
  Muhlenbergia glomerata var. glomerata (Willd.) Trin. -- not accepted
  Muhlenbergia mexicana var. filiformis (Willd.) Scribn. -- not accepted
  Muhlenbergia sobolifera (Muhl. ex Willd.) Trin. -- accepted -- rock muhly
  Muhlenbergia sobolifera f. sobolifera (Muhl. ex Willd.) Trin. -- not accepted
  Muhlenbergia sobolifera ssp. sobolifera (Muhl. ex Willd.) Trin. -- not accepted
  Muhlenbergia sobolifera var. sobolifera (Muhl. ex Willd.) Trin. -- not accepted
  Muhlenbergia tenuiflora (Willd.) Britton, Sterns & Poggenb. -- accepted -- slender muhly
  Muhlenbergia tenuiflora ssp. tenuiflora (Willd.) Britton, Sterns & Poggenb. -- not accepted
  Muhlenbergia tenuiflora var. tenuiflora (Willd.) Britton, Sterns & Poggenb. -- not accepted -- muhlenbergie ténue variété ténue, slender muhly
  Mundulea sericea (Willd.) A. Chev. -- accepted
  Myrciaria floribunda (H. West ex Willd.) O. Berg -- accepted -- guavaberry
  Najas flexilis (Willd.) Rostk. & W.L.E. Schmidt -- accepted -- nodding waternymph, slender naiad, wavy waternymph
  Nelumbium luteum Willd. -- not accepted
  Nelumbium pentapetalum (Walter) Willd. -- not accepted
  Nelumbium speciosum Willd. -- not accepted
  Nelumbo lutea Willd. -- accepted -- American lotus, lotus
  Nelumbo pentapetala (Walter) Willd. -- not accepted
  Nelumbo speciosa Willd. -- not accepted
  Nelumbo speciosum Willd. -- not accepted
  Neorudolphia volubilis (Willd.) Britton -- accepted -- bejuco de alambre
  Nepenthes phyllamphora Willd. -- not accepted
  Nephrolepis pectinata (Willd.) Schott -- accepted -- basket fern, toothed sword fern
  Nestlera festuciformis Willd. ex Steud. -- not accepted
  Nicotiana repanda Willd. ex Lehm. -- accepted -- fiddleleaf tobacco, wild tobacco
  Ocimum micranthum Willd. -- not accepted
  Ocimum viride Willd. -- not accepted
  Oenothera laciniata ssp. pubescens (Willd. ex Spreng.) Munz -- not accepted
  Oenothera laciniata var. pubescens (Willd. ex Spreng.) Munz -- not accepted
  Oenothera pubescens Willd. ex Spreng. -- accepted -- silky evening primrose, South American evening primrose, South American evening-primrose, South American eveningprimrose
  Olea verrucosa (Willd.) Link -- not accepted
  Oleandra nodosa (Willd.) C. Presl -- not accepted
  Oligosporus dracunculus ssp. glaucus (Pall. ex Willd.) A. Löve & D. Löve -- not accepted
  Onobrychis pallasii (Willd.) M. Bieb. -- accepted
  Onobrychis petraea (M. Bieb. ex Willd.) Fisch. -- accepted
  Onoclea struthiopteris var. pensylvanica (Willd.) B. Boivin -- not accepted
  Onopordum tauricum Willd. -- accepted -- bull cottonthistle, Scotch thistle, taurus cotton thistle
  Ophiuros cylindricus (Willd.) P. Beauv. -- not accepted
  Oplismenus echinatus (Willd.) Kunth -- not accepted
  Opuntia brasiliensis (Willd.) Haw. -- not accepted -- Brazilian pricklypear
  Opuntia monacantha (Willd.) Haw. -- accepted -- common pricklypear
  Opuntia monocantha (Willd.) Haw. -- not accepted
  Opuntia triacantha (Willd.) Sweet -- accepted -- Spanish lady
  Orthopogon echinatus (Willd.) Spreng. -- not accepted
  Osmunda regalis var. spectabilis (Willd.) A. Gray -- accepted -- royal fern
  Oxytropis sordida auct. non (Willd.) Pers. -- not accepted
  Packera obovata (Muhl. ex Willd.) W.A. Weber & Á. Löve -- accepted -- roundleaf ragwort
  Packera paupercula var. balsamitae (Muhl. ex Willd.) Mohlenbr. -- accepted
  Panicularia nervata (Willd.) Kuntze -- not accepted
  Panicum acutifolium Willd. ex Spreng. -- not accepted
  Panicum adpressum Willd. -- not accepted
  Panicum ascendens Willd. ex Spreng. -- not accepted
  Panicum auriculatum Willd. ex Spreng. -- not accepted
  Panicum barbatum (Willd.) Kunth -- not accepted
  Panicum biforme (Willd.) Kunth -- not accepted
  Panicum cernuum (Kunth) Willd. ex Spreng. -- not accepted
  Panicum commutatum var. didactylum (Willd.) Nees -- not accepted
  Panicum crinitum Willd. ex Steud. -- not accepted
  Panicum crus-ardeae Willd. ex Nees -- not accepted
  Panicum crus-galli var. echinatum (Willd.) Döll -- not accepted
  Panicum crus-pici Willd. ex Döll -- not accepted
  Panicum dasyurum Willd. ex Nees -- not accepted
  Panicum densiflorum Willd. ex Spreng. -- not accepted
  Panicum didactylum (Willd.) Kunth -- not accepted
  Panicum distans Willd. ex Spreng. -- not accepted
  Panicum echinatum Willd. ex Döll -- not accepted
  Panicum echinatum Willd. -- not accepted
  Panicum elatum Willd. ex Steud. -- not accepted
  Panicum erubescens Willd. -- not accepted
  Panicum fuscescens Willd. ex Nees -- not accepted
  Panicum geniculatum Willd. -- not accepted
  Panicum glaucescens Willd. ex Döll -- not accepted
  Panicum horizontale (Willd.) G. Mey. -- not accepted
  Panicum imberbe var. dasyurum (Willd. ex Nees) Döll -- not accepted
  Panicum lagopus Willd. ex Spreng. -- not accepted
  Panicum lappaceum Willd. ex Spreng. -- not accepted
  Panicum nigricans Willd. ex Spreng. -- not accepted
  Panicum nodosum Willd. ex Steud. -- not accepted
  Panicum onurus Willd. ex Trin. -- not accepted
  Panicum onurus Willd. ex Nees -- not accepted
  Panicum orientale (Rich.) Willd. -- not accepted
  Panicum orinocense Willd. ex Spreng. -- not accepted
  Panicum palmifolium Willd. ex Poir. -- not accepted
  Panicum pedunculare Willd. ex Steud. -- not accepted
  Panicum penicillatum Willd. ex Nees -- not accepted
  Panicum plicatum Willd. -- not accepted
  Panicum pulchrum Willd. ex Spreng. -- not accepted
  Panicum pulcrum Willd. ex Spreng. -- not accepted
  Panicum pulcrum Willd. ex Trin. -- not accepted
  Panicum rostratum Muhl. ex Willd. -- not accepted
  Panicum sanguinale ssp. horizontale (Willd.) Hack. -- not accepted
  Panicum sanguinale var. biforme (Willd.) Hack. ex T. Durand & Schinz -- not accepted
  Panicum sanguinale var. horizontale (Willd.) Schweinf. -- not accepted
  Panicum spithamaeum Willd. ex Nees -- not accepted
  Panicum tectum Willd. ex Spreng. -- not accepted
  Panicum trichogonum Willd. -- not accepted
  Panicum triquetrum Willd. ex Döll -- not accepted
  Paraserianthes lophantha (Willd.) I.C. Nielsen -- accepted -- plume albizia
  Parietaria pensylvanica Muhl. ex Willd. -- accepted -- Pennsylvania pellitory
  Parietaria pensylvanica var. pensylvanica Muhl. ex Willd. -- not accepted -- Pennsylvania pellitory
  Parosela alopecuroides (Willd.) Rydb. -- not accepted
  Paspalum confertum Willd. ex Steud. -- not accepted
  Paspalum convexum Willd. ex Döll -- not accepted
  Paspalum distachyon Willd. ex Döll -- not accepted
  Paspalum eriophorum Willd. ex Nees -- not accepted
  Paspalum fasciculatum Willd. ex Flüggé -- accepted -- Mexican crowngrass
  Paspalum lanuginosum Willd. ex Steud. -- not accepted
  Paspalum monostachyum Willd. ex Steud. -- not accepted
  Paspalum pellitum Willd. ex Steud. -- not accepted
  Paspalum platycaule Willd. ex Steud. -- not accepted
  Paspalum pubescens Muhl. ex Willd. -- not accepted
  Paspalum sanguinale var. didactylum (Willd.) A. Camus -- not accepted
  Paspalum tenellum Willd. -- accepted
  Paspalum tenue Willd. ex Steud. -- not accepted
  Paspalum tristachyum Willd. ex Steud. -- not accepted
  Pavonia corymbosa (Sw.) Willd. -- accepted -- tight-flower swampmallow
  Pecluma plumula (Humb. & Bonpl. ex Willd.) M.G. Price -- accepted -- plumed rockcap fern
  Pedicularis euphrasioides Stephan ex Willd. -- not accepted
  Pedicularis sudetica Willd. -- accepted -- sudetic lousewort
  Pelargonium inodorum Willd. -- accepted -- scentless geranium
  Penicillaria Willd. -- not accepted
  Penicillaria spicata (L.) Willd. -- not accepted
  Pennisetum erubescens (Willd.) Link -- not accepted
  Pennisetum erubescens (Willd.) Desv. ex Ham. -- not accepted
  Penstemon campanulatus (Cav.) Willd. -- accepted -- bellflower beardtongue
  Penstemon hirsutus (L.) Willd. -- accepted -- hairy beardtongue
  Penstemon hirsutus var. hirsutus (L.) Willd. -- not accepted -- hairy beardtongue
  Peramium pubescens (Willd.) MacMill. -- not accepted
  Persicaria coccinea (Muhl. ex Willd.) Greene -- not accepted
  Persicaria glabra (Willd.) M. Gómez -- accepted -- denseflower knotweed
  Phacellaria panicea Willd. ex Steud. -- not accepted
  Phalaris aristata Schousb. ex Willd. -- not accepted
  Phalaris bellardii Willd. -- not accepted
  Phaseolus angularis (Willd.) W. Wight -- not accepted
  Phaseolus heterophyllus Willd. -- not accepted
  Philadelphus grandiflorus Willd. -- not accepted
  Philadelphus inodorus var. grandiflorus (Willd.) A. Gray -- not accepted
  Phlebodium areolatum (Humb. & Bonpl. ex Willd.) J. Sm. -- not accepted
  Phlebodium decumanum (Willd.) J. Sm. -- accepted -- creeping golden polypody
  Phleum bellardi (Willd.) Willd. -- not accepted
  Phleum bellardii (Willd.) Willd. -- not accepted
  Phleum macrourum (Kunth) Willd. ex Steud. -- not accepted
  Phyllanthus debilis Klein ex Willd. -- accepted -- niruri
  Phyllanthus juglandifolius Willd. -- accepted -- gamo de costa
  Phyllanthus juglandifolius var. juglandifolius Willd. -- not accepted
  Phyllanthus virosus Roxb. ex Willd. -- not accepted
  Picris pauciflora Willd. -- accepted -- smallflower oxtongue
  Pityothamnus obovatus (Willd.) Small -- not accepted
  Platanthera blephariglottis (Willd.) Lindl. -- accepted -- platanthčre ŕ gorge frangée, white fringed orchid, white-fringe orchis
  Platanthera blephariglottis var. blephariglottis (Willd.) Lindl. -- accepted -- white fringed orchid
  Platanus acerifolia (Aiton) Willd. -- accepted
  Platanus X acerifolia (Aiton) Willd. (pro sp.) -- not accepted -- London planetree
  Plectranthus parviflorus Willd. -- accepted -- little spurflower
  Pleopeltis Humb. & Bonpl. ex Willd. -- accepted -- scaly polypody
  Pleopeltis revoluta (Spreng. ex Willd.) A.R. Sm. -- not accepted
  Pluchea adnata (Humb. & Bonpl. ex Willd.) C. Mohr -- not accepted
  Poa arenaria Willd. ex Spreng. -- not accepted
  Poa atrovirens Willd. ex Spreng. -- not accepted
  Poa cristata (L.) Willd. -- not accepted
  Poa elongata Willd. -- not accepted
  Poa nervata Willd. -- not accepted
  Poa tenella Willd. (L. misappl. by) Pursh -- not accepted
  Poa trinervata Willd. ex Muhl. -- not accepted
  Poa uliginosa Willd. ex Spreng. -- not accepted
  Poa vivipara (L.) Willd. -- not accepted
  Podosemum glomeratum (Willd.) Link -- not accepted
  Podosemum soboliferum (Muhl. ex Willd.) Link -- not accepted
  Podosemum tenuiflorum (Willd.) Link -- not accepted
  Poinsettia pulcherrima (Willd. ex Klotzsch) Graham -- not accepted
  Polemonium acutiflorum Willd. ex Roem. & Schult. -- not accepted -- tall Jacob's-ladder
  Polybotrya Humb. & Bonpl. ex Willd. -- accepted
  Polygala paucifolia Willd. -- accepted -- gaywings
  Polygonatum canaliculatum auct. non (Muhl. ex Willd.) Pursh -- not accepted
  Polygonatum pubescens (Willd.) Pursh -- accepted -- hairy Solomon's seal
  Polygonum amphibium var. coccineum (Muhl. ex Willd.) Farw. -- not accepted
  Polygonum coccineum Muhl. ex Willd. -- not accepted -- longroot smartweed
  Polygonum coccineum var. terrestre Willd. -- not accepted
  Polygonum glabrum Willd. -- not accepted -- denseflower knotweed
  Polygonum muehlenbergii var. terrestre (Willd.) Trel. -- not accepted
  Polygonum muhlenbergii var. terrestre (Willd.) Trel. -- not accepted
  Polygonum salicifolium Brouss. ex Willd. -- not accepted
  Polypodium attenuatum Humb. & Bonpl. ex Willd. -- not accepted -- tapered polypody
  Polypodium aureum var. areolatum (Humb. & Bonpl. ex Willd.) Baker -- not accepted
  Polypodium ciliatum Willd. -- not accepted
  Polypodium cultratum Willd. -- not accepted
  Polypodium decumanum Willd. -- not accepted
  Polypodium plumula Humb. & Bonpl. ex Willd. -- not accepted
  Polypodium sororium Humb. & Bonpl. ex Willd. -- not accepted
  Polypodium vulgare var. cambricum (L.) Willd. -- not accepted
  Polypogon glomeratus Willd. -- not accepted
  Polypogon maritimus Willd. -- accepted -- Mediterranean rabbitsfoot grass
  Polypogon monspeliensis var. maritimus (Willd.) Coss. & Durand -- not accepted
  Polystichum platyphyllum (Willd.) C. Presl -- accepted -- flatleaf hollyfern
  Poponax macracantha (Humb. & Bonpl. ex Willd.) Killip -- not accepted
  Porteranthus stipulatus (Muhl. ex Willd.) Britton -- not accepted -- Indian physic
  Potentilla biflora Willd. ex Schltdl. -- accepted -- twoflower cinquefoil
  Potentilla emarginata ssp. nana (Willd. ex Schltdl.) Hultén -- not accepted
  Potentilla fragiformis Willd. ex Schltdl. -- accepted -- strawberry cinquefoil
  Potentilla fruticosa var. tenuifolia (Willd. ex Schltdl.) Lehm. -- not accepted
  Potentilla hyparctica ssp. nana (Willd. ex Schltdl.) Hultén -- not accepted
  Potentilla nana Willd. ex Schltdl. -- accepted -- arctic cinquefoil
  Potentilla recta var. pilosa (Willd.) Ledeb. -- not accepted
  Potentilla tenuifolia Willd. ex Schltdl. -- not accepted
  Prestoea acuminata (Willd.) H.E. Moore -- accepted -- Sierran palm
  Prosopis laevigata (Humb. & Bonpl. ex Willd.) M.C. Johnst. -- accepted -- smooth mesquite
  Prosopis pallida (Humb. & Bonpl. ex Willd.) Kunth -- accepted -- algaroba, kiawe, mesquite
  Prunus pumila ssp. susquehanae (Willd.) R.T. Clausen -- not accepted
  Prunus pumila var. susquehanae (Willd.) H. Jaeger -- accepted -- Sesquehana sandcherry
  Prunus susquehanae Willd. -- not accepted -- Sesquehana sandcherry
  Pteretis pensylvanica (Willd.) Fernald -- not accepted
  Pteris pungens Willd. -- accepted -- sharp brake
  Pterocarpus indicus Willd. -- accepted
  Pueraria lobata (Willd.) Ohwi -- not accepted -- kudzu, kudzu vine
  Pueraria montana var. lobata (Willd.) Maesen & S.M. Almeida ex Sanjappa & Predeep -- accepted -- acha, aka, Japanese arrowroot, kudzu, nepalem, wa yaka
  Pyrethrum anethifolium Willd. -- not accepted
  Pyrus alpina Willd. -- not accepted
  Pyrus arbutifolia var. nigra Willd. -- not accepted
  Pyrus melanocarpa (Michx.) Willd. -- not accepted
  Pyrus prunifolia Willd. -- not accepted
  Pyrus X alpina Willd. -- not accepted
  Quercus bicolor Willd. -- accepted -- chęne bicolore, swamp white oak
  Quercus hemisphaerica Bartram ex Willd. -- accepted -- Darlington's oak
  Quercus hemisphaerica auct. non Bartram ex Willd. -- not accepted -- Darlington's oak
  Quercus hemisphaerica var. hemisphaerica Bartram ex Willd. -- not accepted -- Darlington's oak
  Quercus maritima (Michx.) Willd. -- not accepted
  Quercus montana Willd. -- accepted -- chestnut oak
  Quercus myrtifolia Willd. -- accepted -- myrtle oak
  Quercus obtusa (Willd.) Ashe -- not accepted
  Quercus prinoides Willd. -- accepted -- dwarf chinkapin oak, dwarf chinquapin oak
  Ranunculus cortusifolius Willd. -- accepted -- Azores buttercup
  Raphanus lanceolatus Willd. -- not accepted
  Rauvolfia viridis Willd. ex Roem. & Schult. -- accepted -- bois lait, matteroot, milkbush, milky bush
  Rehsonia floribunda (Willd.) Stritch -- not accepted
  Reseda scoparia Brouss. ex Willd. -- accepted
  Rhododendron speciosum (Willd.) Sweet -- not accepted
  Rhynchelytrum repens (Willd.) C.E. Hubb. -- not accepted -- Natal grass, rose Natal grass
  Ribes triflorum Willd. -- not accepted
  Rosa gemella Willd. -- not accepted
  Rosa lucida Willd. -- not accepted
  Rosa nitida Willd. -- accepted -- shining rose
  Rotala indica (Willd.) Koehne -- accepted -- Indian toothcup
  Rottboellia cylindrica Willd. -- not accepted
  Rubus flagellaris Willd. -- accepted -- northern dewberry, whiplash dewberry
  Rubus heterophyllus Willd. -- accepted -- ecotone blackberry
  Rubus laciniatus Willd. -- accepted -- cut-leaved blackberry, cutleaf blackberry
  Rubus ulmifolius var. inermis (Willd.) Focke -- not accepted -- elmleaf blackberry
  Rumex confertus Willd. -- accepted -- Asiatic dock
  Sabicea villosa Willd. ex Roem. & Schult. -- accepted -- woolly woodvine
  Saccharum aegyptiacum Willd. -- not accepted
  Saccharum repens Willd. -- not accepted
  Saccharum spontaneum var. aegyptiacum (Willd.) Hack. -- not accepted
  Sagittaria latifolia Willd. -- accepted -- broadleaf arrowhead, common arrowhead, duck-potato, sagittaire latifoliée, wapato
  Sagittaria latifolia var. latifolia Willd. -- not accepted -- broadleaf arrowhead
  Sagittaria obtusa Muhl. ex Willd. non Thunb. -- not accepted
  Salix bicolor Ehrh. ex Willd. -- accepted -- willow
  Salix candida Flüggé ex Willd. -- accepted -- sage willow, sageleaf willow
  Salix grisea Willd. -- not accepted
  Salix humboldtiana Willd. -- not accepted -- Humboldt's willow
  Salix muehlenbergiana Willd. -- not accepted
  Salix myrsinites var. jacquiniana (Willd.) W.D.J. Koch -- not accepted
  Salix petiolaris var. grisea (Willd.) Torr. -- not accepted
  Salix X pontederana Willd. -- accepted
  Salix X smithiana Willd. (pro sp.) -- accepted -- silky-leaf osier
  Salvinia laevigata Humb. & Bonpl. ex Willd. -- not accepted
  Salvinia rotundifolia auct. non Willd. -- not accepted
  Salvinia rotundifolia Willd. -- not accepted
  Sapindus marginatus Willd. -- not accepted
  Saussurea angustifolia (Willd.) DC. -- accepted -- narrowleaf saw-wort
  Saussurea angustifolia var. angustifolia (Willd.) DC. -- accepted -- narrowleaf saw-wort
  Savastana alpina (Sw. ex Willd.) Scribn. -- not accepted
  Savastana odorata var. fragrans (Willd.) Farw. -- not accepted
  Savia Willd. -- accepted
  Savia sessiliflora (Sw.) Willd. -- accepted -- amansa guapo
  Saxifraga davurica Willd. -- not accepted
  Saxifraga flagellaris Willd. -- accepted -- spider saxifrage, stoloniferous saxifrage, whiplash saxifrage
  Saxifraga flagellaris ssp. flagellaris Willd. -- accepted -- whiplash saxifrage
  Saxifraga hieracifolia Waldst. & Kit. ex Willd. -- not accepted
  Saxifraga hieraciifolia Waldst. & Kit. ex Willd. -- not accepted -- stiffstem saxifrage
  Saxifraga hieraciifolia var. hieraciifolia Waldst. & Kit. ex Willd. -- not accepted -- stiffstem saxifrage
  Schedonorus tenellus (Willd.) P. Beauv. -- not accepted
  Schleichera Willd. -- accepted
  Schrankia Willd. -- not accepted
  Schrankia Willd. -- not accepted
  Schrankia uncinata Willd. -- not accepted
  Scirpus atrovirens Willd. -- accepted -- dark-green bulrush, green bulrush
  Scirpus obtusus Willd. -- not accepted
  Scleria laevis Willd. -- accepted -- nutrush
  Scleria nitida Muhl. ex Willd. -- not accepted
  Scleria nutans Willd. ex Kunth -- not accepted -- nodding nutrush
  Scleria pauciflora Muhl. ex Willd. -- accepted -- fewflower nutrush
  Scleria pauciflora var. caroliniana (Willd.) Alph. Wood -- accepted -- Carolina nutrush
  Scleria pauciflora var. pauciflora Muhl. ex Willd. -- accepted -- fewflower nutrush
  Scleria verticillata Muhl. ex Willd. -- accepted -- low nutrush
  Scolochloa festucacea (Willd.) Link -- accepted -- common rivergrass, rivergrass
  Senecio balsamitae Muhl. ex Willd. -- not accepted
  Senecio bicolor (Willd.) Todaro -- not accepted -- silver ragwort
  Senecio hybridus (Willd.) Regel -- not accepted
  Senecio obovatus Muhl. ex Willd. -- not accepted -- round-leaf groundsel, roundleaf ragwort, séneçon ŕ feuilles obovales
  Senecio pauperculus var. balsamitae (Muhl. ex Willd.) Fernald -- not accepted
  Senecio X hybridus (Willd.) Regel -- not accepted -- common ragwort, florist's cineraria
  Senna pendula (Humb. & Bonpl. ex Willd.) H.S. Irwin & Barneby -- accepted -- valamuerto
  Senna pendula var. pendula (Humb. & Bonpl. ex Willd.) H.S. Irwin & Barneby -- accepted -- valamuerto
  Sesbania sericea (Willd.) Link -- accepted -- papagayo
  Sesuvium microphyllum Willd. -- accepted -- little-leaf seapurslane
  Setaria crus-ardeae (Willd. ex Nees) Kunth -- not accepted
  Setaria erubescens (Willd.) P. Beauv. -- not accepted
  Setaria geniculata (Willd.) P. Beauv. -- not accepted -- marsh bristlegrass
  Setaria glauca var. penicillata (Willd. ex Nees) Griseb. -- not accepted
  Setaria gracilis f. penicillata (Willd. ex Nees) Mez ex Ekman -- not accepted
  Setaria gracilis var. dasyura (Willd. ex Nees) Arechav. -- not accepted
  Setaria onurus (Willd. ex Trin.) Griseb. -- not accepted
  Setaria penicillata (Willd. ex Nees) J. Presl -- not accepted
  Shirakiopsis indica (Willd.) Esser -- accepted
  Sicyos parviflorus Willd. -- accepted -- smallflower bur cucumber, smallflower burr cucumber
  Sieversia Willd. -- accepted
  Silene apetala Willd. -- accepted
  Silene chlorantha (Willd.) Ehrh. -- accepted -- yellowgreen catchfly
  Silphium atropurpureum Retz. ex Willd. -- not accepted
  Siphonia brasiliensis Willd. ex A. Juss. -- not accepted
  Smelowskia calycina (Stephan ex Willd.) C.A. Mey. -- accepted -- alpine smelowskia
  Smilax bona-nox var. hastata (Willd.) A. DC. -- not accepted
  Smilax domingensis Willd. -- accepted
  Smilax rotundifolia var. quadrangularis (Muhl. ex Willd.) Alph. Wood -- not accepted
  Solanum lichtensteinii Willd. -- accepted
  Solanum pubescens Willd. -- accepted
  Solanum sublobatum auct. non Willd. ex Roem. & Schult. -- not accepted
  Solidago hispida Muhl. ex Willd. -- accepted -- hairy goldenrod
  Solidago hispida var. hispida Muhl. ex Willd. -- not accepted -- hairy goldenrod
  Solidago patula Muhl. ex Willd. -- accepted -- roundleaf goldenrod
  Solidago patula ssp. patula Muhl. ex Willd. -- accepted -- roundleaf goldenrod
  Solidago patula var. patula Muhl. ex Willd. -- not accepted
  Solidago scabra Muhl. ex Willd. non Muhl. -- not accepted
  Solidago ulmifolia Muhl. ex Willd. -- accepted -- elmleaf goldenrod
  Solidago ulmifolia var. ulmifolia Muhl. ex Willd. -- accepted -- elmleaf goldenrod
  Sorbus alpina (Willd.) Heynh. -- not accepted
  Sorbus X alpina (Willd.) Heynh. (pro sp.) -- not accepted
  Sorghum bracteatum (Humb. & Bonpl. ex Willd.) Kuntze -- not accepted
  Spartina juncea (Michx.) Willd. -- not accepted
  Spermacoce ocymifolia Willd. ex Roem. & Schult. -- accepted
  Spiraea stipulata Muhl. ex Willd. -- not accepted
  Sporobolus tremulus (Willd.) Kunth -- not accepted
  Stachys grandiflora (Stephan ex Willd.) Benth. -- not accepted -- big-sage
  Stachys tenuifolia Willd. -- accepted -- slender betony, smooth hedge-nettle, smooth hedgenettle
  Stachys tenuifolia var. tenuifolia Willd. -- not accepted -- smooth hedgenettle
  Stellaria cuspidata Willd. ex Schltdl. -- accepted -- Mexican starwort
  Stellaria cuspidata ssp. cuspidata Willd. ex Schltdl. -- accepted -- Mexican starwort
  Stellaria longifolia Muhl. ex Willd. -- accepted -- long-leaf starwort, longleaf chickweed, longleaf starwort
  Stellaria longifolia var. longifolia Muhl. ex Willd. -- not accepted -- longleaf starwort
  Stenactis strigosa (Muhl. ex Willd.) DC. -- not accepted
  Stevia ovata Willd. -- accepted -- roundleaf candyleaf
  Stevia ovata var. ovata Willd. -- accepted -- roundleaf candyleaf
  Stevia serrata var. ivifolia (Willd.) B.L. Rob. -- not accepted
  Sticherus bifidus (Willd.) Ching -- accepted -- Mexican umbrella fern
  Stipa alpestris Willd. ex Steud. -- not accepted
  Stipa diffusa Willd. ex Steud. -- not accepted
  Stipa expansa Willd. ex Steud. -- not accepted
  Stipa tenuis Willd. ex Steud. -- not accepted
  Striga gesnerioides (Willd.) Vatke -- accepted -- cowpea witchweed, witchweed
  Strophostyles umbellata (Muhl. ex Willd.) Britton -- accepted -- perennial wildbean, pink fuzzybean
  Stylosanthes mucronata Willd. -- not accepted
  Symphyotrichum laeve var. concinnum (Willd.) G.L. Nesom -- accepted -- smooth blue aster
  Symphyotrichum lanceolatum (Willd.) G.L. Nesom -- accepted -- white panicle aster
  Symphyotrichum lanceolatum ssp. lanceolatum (Willd.) G.L. Nesom -- accepted -- white panicle aster
  Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum (Willd.) G.L. Nesom -- not accepted
  Symphyotrichum lanceolatum var. lanceolatum (Willd.) G.L. Nesom -- accepted -- white panicle aster
  Symphyotrichum phlogifolium (Muhl. ex Willd.) G.L. Nesom -- accepted -- thinleaf late purple aster
  Symphyotrichum pilosum (Willd.) G.L. Nesom -- accepted -- hairy white oldfield aster
  Symphyotrichum pilosum var. pilosum (Willd.) G.L. Nesom -- accepted -- hairy white oldfield aster
  Symphyotrichum prenanthoides (Muhl. ex Willd.) G.L. Nesom -- accepted -- crookedstem aster
  Symphyotrichum sagittifolium (Wedem. ex Willd.) G.L. Nesom -- not accepted
  Symphyotrichum simplex (Willd.) A. Löve & D. Löve -- not accepted
  Symphyotrichum X salignum (Willd.) G.L. Nesom -- accepted
  Symphyotrichum X versicolor (Willd.) G.L. Nesom -- accepted
  Syntherisma barbata (Willd.) Nash -- not accepted
  Syringa X chinensis Willd. -- accepted -- Chinese lilac
  Tabernaemontana coronaria (Jacq.) Willd. -- not accepted
  Talinum triangulare (Jacq.) Willd. -- not accepted -- Ceylon spinach, Philippine spinach
  Tamarix canariensis Willd. -- accepted -- Canary Island tamarisk, saltcedar, tamarisk, tamarix
  Tanacetum coccineum (Willd.) Grierson -- accepted -- pyrethum daisy
  Taraxacum laevigatum (Willd.) DC. -- not accepted -- red-seed dandelion, rock dandelion
  Tectaria fimbriata (Willd.) Proctor & Lourteig -- accepted -- least halberd fern
  Tectaria heracleifolia (Willd.) Underw. -- accepted -- broad halberd fern
  Teloxys graveolens (Willd.) W.A. Weber -- not accepted
  Terrellia canadensis var. glaucifolia (Willd.) Lunell ex Hitchc. -- not accepted
  Terrellia villosa (Muhl. ex Willd.) B.R. Baum -- not accepted
  Thalictrum squarrosum Stephan ex Willd. -- accepted
  Thelypteris angustifolia (Willd.) Proctor -- accepted -- broadleaf maiden fern
  Thelypteris interrupta (Willd.) K. Iwats. -- accepted -- Willdenow's maiden fern
  Thelypteris oligocarpa (Humb. & Bonpl. ex Willd.) Ching -- accepted -- maiden fern
  Thelypteris pellita (Willd.) Proctor & Lourteig -- accepted
  Theobroma grandiflorum (Willd. ex Spreng.) K. Schum. -- accepted -- theobroma
  Thymus marschallianus Willd. -- not accepted
  Tillaea vaillantii sensu A. Gray, non Willd. -- not accepted
  Tillaeastrum vaillantii auct. non (Willd.) Britton -- not accepted
  Tirucalia aphylla (Brouss. ex Willd.) P.V. Heath -- not accepted
  Tithymalus androsaemifolius (Schousb. ex Willd.) Samp. -- not accepted
  Tithymalus aphyllus (Brouss. ex Willd.) Klotzsch & Garcke -- not accepted
  Tithymalus atropurpureus (Brouss. ex Willd.) Klotzsch & Garcke -- not accepted
  Tithymalus herniariifolius (Willd.) Klotzsch & Garcke -- not accepted
  Tithymalus humifusus (Willd.) Bubani -- not accepted
  Tithymalus micranthus (Stephan ex Willd.) Raf. -- not accepted
  Tithymalus squamosus (Willd.) Klotzsch & Garcke -- not accepted
  Tithymalus venetus (Willd.) Klotzsch & Garcke -- not accepted
  Tithymalus villosus (Waldst. & Kit. ex Willd.) Pacher -- not accepted
  Torresia alpina (Sw. ex Willd.) Hitchc. -- not accepted
  Trachypogon plumosus (Humb. & Bonpl. ex Willd.) Nees -- not accepted
  Trachypogon polymorphus var. plumosus (Humb. & Bonpl. ex Willd.) Hack. -- not accepted
  Tragia macrocarpa Willd. -- not accepted
  Tragus unioloides (Willd.) Panz. ex B.D. Jacks. -- not accepted
  Treisia erosa (Willd.) Haw. -- not accepted
  Trevirana coccinea (Scop.) Willd. -- not accepted
  Tricera citrifolia Willd. -- not accepted
  Trichipteris procera (Willd.) R.M. Tryon -- not accepted
  Trichochloa glomerata (Willd.) Trin. -- not accepted
  Trichochloa sobolifera (Muhl. ex Willd.) Trin. -- not accepted
  Trichochloa tenuiflora (Willd.) Sweet -- not accepted
  Trichodium scabrum (Willd.) Muhl. -- not accepted
  Tricholaena repens (Willd.) Hitchc. -- not accepted
  Trichophyllum tenue (Willd.) Farw. -- not accepted
  Triclisperma paucifolia (Willd.) Nieuwl. -- not accepted
  Trifolium armenium Willd. -- not accepted
  Trifolium canescens Willd. -- accepted -- graying clover
  Trifolium gemellum Pourr. ex Willd. -- accepted -- Spanish clover
  Trifolium lagopus Pourr. ex Willd. -- not accepted
  Trifolium mucronatum Willd. ex Spreng. -- accepted -- cusp clover
  Trifolium mucronatum ssp. mucronatum Willd. ex Spreng. -- accepted
  Trifolium mucronatum var. mucronatum Willd. ex Spreng. -- not accepted
  Trifolium pannonicum ssp. elongatum (Willd.) Zohary -- not accepted
  Trifolium resupinatum var. suaveolens (Willd.) Dinsm. -- not accepted
  Trifolium speciosum Willd. -- not accepted
  Trillium undulatum Willd. -- accepted -- painted trillium
  Triodia festucacea (Willd.) Roth -- not accepted
  Tripsacum dactyloides var. monostachyon (Willd.) Eaton & J. Wright -- not accepted
  Tripsacum dactyloides var. monostachyum (Willd.) Hack. -- not accepted
  Tripsacum monostachyon Willd. -- not accepted
  Triticum ovatum var. triaristatum (Willd.) Schmalh. -- not accepted
  Triticum patulum Willd. -- not accepted
  Triticum sibiricum Willd. -- not accepted
  Turnera diffusa Willd. ex Schult. -- accepted -- damiana
  Turnera diffusa var. diffusa Willd. ex Schult. -- accepted -- damiana
  Turritis laevigata Muhl. ex Willd. -- not accepted
  Urtica dioica var. procera (Muhl. ex Willd.) Wedd. -- not accepted -- California nettle, slender nettle, stinging nettle, tall nettle
  Urtica procera Muhl. ex Willd. -- not accepted
  Vachellia macracantha (Humb. & Bonpl. ex Willd.) Seigler & Ebinger -- accepted -- porknut
  Varronia angustifolia West ex Willd. -- not accepted
  Vernonia anthelmintica (L.) Willd. -- accepted -- ironweed
  Vernonia glauca (L.) Willd. -- accepted -- broadleaf ironweed
  Vernonia pauciflora (Willd.) Less. -- not accepted
  Vicia americana Muhl. ex Willd. -- accepted -- American deervetch, American purple vetch, American vetch, vesce d'Amérique
  Vicia americana ssp. americana Muhl. ex Willd. -- accepted -- American vetch, purple vetch
  Vicia americana var. americana Muhl. ex Willd. -- not accepted -- American vetch
  Vicia canescens ssp. variegata (Willd.) P.H. Davis -- accepted
  Vicia ervilia (L.) Willd. -- accepted -- blister vetch
  Vicia variegata Willd. -- not accepted
  Vicia venosa (Willd. ex Link) Maxim. -- accepted
  Vigna angularis (Willd.) Ohwi & H. Ohashi -- accepted -- adzuki bean
  Vilfa retrofracta (Willd.) P. Beauv. -- not accepted
  Vilfa tremula (Willd.) Trin. -- not accepted
  Viola blanda Willd. -- accepted -- sweet white violet
  Viola blanda var. blanda Willd. -- not accepted -- sweet white violet
  Viola palmata var. sororia (Willd.) Pollard -- not accepted
  Viola sororia Willd. -- accepted -- common blue violet, hooded blue violet
  Viola sororia var. sororia Willd. -- accepted -- common blue violet
  Virgulus patens var. phlogifolius (Muhl. ex Willd.) Reveal & Keener -- not accepted
  Vitex negundo var. bicolor (Willd.) H.J. Lam -- not accepted
  Vitex trifolia var. bicolor (Willd.) Moldenke -- accepted -- simpleleaf chastetree
  Vulpia octoflora var. tenella (Willd.) Fernald -- not accepted
  Vulpia tenella (Willd.) Heynh. -- not accepted
  Waldsteinia Willd. -- accepted -- barren strawberry
  Waldstenia Willd. -- not accepted
  Wisteria floribunda (Willd.) DC. -- accepted -- Japanese wisteria
  X Sorbaronia alpina (Willd.) C.K. Schneid. -- accepted -- alpine sorbaronia
  Xanthocephalum Willd. -- accepted -- xanthocephalum
  Xiphion sordidum Sol. ex Salisb., non Retz. nec Willd. -- not accepted
  Zamia muricata Willd. -- accepted
  Zamia tenuis Willd. -- not accepted
  Zenobia pulverulenta (W. Bartram ex Willd.) Pollard -- accepted -- dusty zenobia, honeycup
  Zeugites americanus Willd. -- accepted
  Zeugites americanus ssp. americanus Willd. -- not accepted
  Zeugites americanus var. americanus Willd. -- accepted
  Zoysia Willd. -- accepted -- lawngrass
  Zoysia pungens Willd. -- not accepted
  Zoysia tenuifolia Willd. ex Trin. -- not accepted
   

A gray bar