VegeWorx Plant Index - Letter W
- Wachendorfia - Wachendorfia Burm.
- Waghorne's Pore Lichen - Pertusaria Waghornei Hulting
- Wagner's Cyrtandra - Cyrtandra Wagneri Lorence & Perlman
- Wagner's Plume Fern - Sadleria Wagneriana D.D. Palmer & T. Flynn
- Waha Milkvetch - Astragalus Arthurii M.E. Jones
- Wahatoya Creek Larkspur - Delphinium Robustum Rydb.
- Wahiawa Bog Colicwood - Myrsine Helleri (O. Deg. & I. Deg.) H. St. John
- Wahiawa Bog Dubautia - Dubautia Pauciflorula H. St. John & G.D. Carr
- Wahiawa Bog Sandmat - Chamaesyce Sparsiflora (A. Heller) Koutnik
- Wahiawa Cyanea - Cyanea Sylvestris A. Heller
- Wahiawa Dubautia - Dubautia Syndetica G.D. Carr & D.H. Lorence
- Wahiawa Labordia - Labordia Tinifolia A. Gray var. wahiawaensis H. St. John
- Wahiawa Mountain Cyrtandra - Cyrtandra Kealiae Wawra
- Wahiawa Mountain Labordia - Labordia Lydgatei Forbes
- Wahiawa Stream Violet - Viola Helenae Forbes & Lydgate
- Wahine Noho Kula - Isodendrion Pyrifolium A. Gray
- Wahini Noho Mauna - Adenophorus Tamariscinus (Kaulf.) Hook. & Grev.
- Wahlbergella Attenuata (Farr) Rydb.
- Wahlbergella Drummondii (Hook.) Rydb.
- Wahlbergella Kingii (S. Watson) Rydb.
- Wahlbergella Montana (S. Watson) Rydb.
- Wahlbergella Parryi (S. Watson) Rydb.
- Wahlbergella Striata (Rydb.) Rydb.
- Wahlbergella Tayloriae (B.L. Rob.) Rydb.
- Wahlenberg's Catolechia Lichen - Catolechia Wahlenbergii (Ach.) Körb.
- Wahlenberg's Oncophorus Moss - Oncophorus Wahlenbergii Brid.
- Wahlenberg's Pohlia Moss - Pohlia Wahlenbergii (F. Weber & D. Mohr) Andrews
- Wahlenberg's Woodrush - Luzula Wahlenbergii Rupr.
- Wahlenbergia Gracilis (G. Forst.) A. DC.
- Wahlenbergia - Wahlenbergia Schrad. ex Roth
- Wai'anae Mountains False Lobelia - Trematolobelia Kaalae (O. Deg.) Lammers
- Wai'oli Valley Pritchardia - Pritchardia Perlmanii C.E. Gemmill
- Waialeale Cheesewood - Pittosporum Gayanum Rock
- Waialeale Dubautia - Dubautia Waialealae Rock
- Waianae Mountain Digit Fern - Doryopteris Subdecipiens W.H. Wagner
- Waianae Range Alsinidendron - Alsinidendron Obovatum Sherff
- Waianae Range Blacksnakeroot - Sanicula Mariversa Nagata & Gon
- Waianae Range Cheesewood - Pittosporum Flocculosum (Hillebr.) Sherff
- Waianae Range Delissea - Delissea Sinuata Hillebr.
- Waianae Range Dubautia - Dubautia Sherffiana Fosberg
- Waianae Range Hala Pepe - Pleomele Forbesii O. Deg.
- Waianae Range Labordia - Labordia Kaalae Forbes
- Waianae Range Lobelia - Lobelia Monostachya (Rock) Lammers
- Waianae Range Melicope - Melicope Christophersenii (H. St. John) T.G. Hartley & B.C. Stone
- Waianae Range Nehe - Lipochaeta Tenuifolia A. Gray
- Waianae Range Papala - Charpentiera Tomentosa Sohmer
- Waianae Range Papala - Charpentiera Tomentosa Sohmer var. maakuaensis Sohmer
- Waianae Range Papala - Charpentiera Tomentosa Sohmer var. tomentosa
- Waianae Range Pepperwort - Lepidium Arbuscula Hillebr.
- Waianae Range Phyllostegia - Phyllostegia Mollis Benth.
- Waianae Range Pritchardia - Pritchardia Kaalae Rock
- Waianae Range Schiedea - Schiedea Kealiae Caum & Hosaka
- Waianae Range Starviolet - Hedyotis Degeneri Fosberg
- Waianae Range Starviolet - Hedyotis Degeneri Fosberg var. coprosmifolia Fosberg
- Waianae Range Starviolet - Hedyotis Degeneri Fosberg var. degeneri
- Waianae Range Tetramolopium - Tetramolopium Lepidotum (Less.) Sherff
- Waianae Range Tetramolopium - Tetramolopium Lepidotum (Less.) Sherff ssp. arbusculum (A. Gray) Lowrey
- Waianae Range Tetramolopium - Tetramolopium Lepidotum (Less.) Sherff ssp. lepidotum
- Waianae Range Wild Coffee - Psychotria Hathewayi Fosberg
- Waianae Range Wild Coffee - Psychotria Hathewayi Fosberg var. brevipetiolata Fosberg
- Waianae Range Wild Coffee - Psychotria Hathewayi Fosberg var. hathewayi
- Waianae Range Yellow Loosestrife - Lysimachia Waianaeensis H. St. John
- Waianaeuka Cyrtandra - Cyrtandra Waianaeensis H. St. John & Storey
- Waihanau Lobelia - Lobelia Dunbarii Rock
- Waihanau Lobelia - Lobelia Dunbarii Rock ssp. dunbarii
- Waihanau Lobelia - Lobelia Dunbarii Rock ssp. paniculata (Rock) Lammers
- Waihee Clermontia - Clermontia Multiflora Hillebr.
- Waihee Valley Cyanea - Cyanea Lobata H. Mann
- Waihee Valley Cyanea - Cyanea Lobata H. Mann ssp. baldwinii (Forbes & Munro) Lammers
- Waihee Valley Cyanea - Cyanea Lobata H. Mann ssp. lobata
- Waihee Valley Peperomia - Peperomia Ligustrina Hillebr.
- Waihoi Beggarticks - Bidens Campylotheca Sch. Bip. ssp. waihoiensis H. St. John
- Waikamoi Peperomia - Peperomia Subpetiolata Yunck.
- Waikamoi Woodfern - Dryopteris Tetrapinnata W.H. Wagner & Hobdy
- Waikane Valley Cyrtandra - Cyrtandra Kaulantha H. St. John & Storey
- Wailai Pali Clermontia - Clermontia Pallida Hillebr.
- Wailau Valley Melicope - Melicope Wailauensis (H. St. John) T.G. Hartley & B.C. Stone
- Wailua River Yellow Loosestrife - Lysimachia Filifolia Forbes
- Wailua River Yellow Loosestrife - Lysimachia Iniki Marr
- Wailupe Valley Treecotton - Kokia Lanceolata Lewt.
- Waimakanui - Pteris Excelsa Gaudich.
- Waimea Canyon Nehe - Lipochaeta Waimeaensis H. St. John
- Waimea Phyllostegia - Phyllostegia Knudsenii Hillebr.
- Waimea Pipturus - Pipturus Albidus (Hook. & Arn.) A. Gray
- Wain's Cup Lichen - Cladonia Wainioi Savicz
- Wainiha Valley Yellow Loosestrife - Lysimachia Ovoidea H. St. John
- Waioiani Clermontia - Clermontia Persicifolia Gaudich.
- Waioli Valley Maiden Fern - Thelypteris Wailele T. Flynn
- Waioli Valley Rollandia - Cyanea Parvifolia (Forbes) Lammers, Givnish & Systma
- Waipio Valley Clermontia - Clermontia Kohalae Rock
- Wait-a-bit Vine - Caesalpinia Phyllanthoides Standl.
- Waldo Buckwheat - Eriogonum Pendulum S. Watson
- Waldo Manzanita - Arctostaphylos ×cinerea Howell (pro sp.)
- Waldo Rockcress - Arabis Aculeolata Greene
- Waldsteinia Doniana Tratt.
- Waldsteinia Fragarioides (Michx.) Tratt. var. fragarioides
- Waldsteinia Fragarioides (Michx.) Tratt. var. parviflora (Small) Fernald
- Waldsteinia Parviflora Small
- Walker Pass Milkvetch - Astragalus Ertterae Barneby & Shevock
- Walker Prairie Clover - Dalea Pogonathera A. Gray var. walkerae (Tharp & F.A. Barkley) B.L. Turner
- Walker's Manihot - Manihot Walkerae Croizat
- Walker's Necklace Fern - Lindsaea Walkerae Hook.
- Walker's Suncup - Camissonia Walkeri (A. Nelson) P.H. Raven
- Walker's Suncup - Camissonia Walkeri (A. Nelson) P.H. Raven ssp. tortilis (Jeps.) P.H. Raven
- Walker's Suncup - Camissonia Walkeri (A. Nelson) P.H. Raven ssp. walkeri
- Walking Fern - Asplenium Rhizophyllum L.
- Walking-stick Palm - Linospadix Monostachya (Mart.) H. Wendl.
- Walkingstick Cactus - Cylindropuntia Spinosior (Engelm.) F.M. Knuth
- Wall Barley - Hordeum Murinum L. ssp. murinum
- Wall Bedstraw - Galium Parisiense L.
- Wall Germander - Teucrium Chamaedrys L.
- Wall Hawkweed - Hieracium Murorum L.
- Wall Iris - Iris Tectorum Maxim.
- Wall-lettuce - Mycelis Muralis (L.) Dumort.
- Wallaby Grass - Amphibromus Nees
- Wallaby Grass - Rytidosperma Biannulare (Zotov) Connor & Edgar
- Wallaby Grass - Rytidosperma Racemosum (R. Br.) Connor & Edgar
- Wallaby Grass - Rytidosperma Steud.
- Wallace's Spikemoss - Selaginella Wallacei Hieron.
- Wallace's Tobacco - Nicotiana Quadrivalvis Pursh var. wallacei (A. Gray) Mansf.
- Wallangarra Wattle - Acacia Adunca A. Cunn. ex G. Don
- Wallenia Pendula (Urb.) Mez
- Wallflower - Erysimum L.
- Wallflower Orchid - Tetramicra Lindl.
- Wallflower Phoenicaulis - Phoenicaulis Cheiranthoides Nutt.
- Wallia Cinerea (L.) Alef.
- Wallia Nigra (L.) Alef.
- Wallich's Bindweed - Convolvulus Wallichianus Spreng.
- Wallich's Glorybower - Clerodendrum Wallichii Merr.
- Wallowa Beardtongue - Penstemon Spatulatus Pennell
- Wallowa Cryptantha - Cryptantha Subcapitata Dorn & Lichvar
- Wallowa Indian Paintbrush - Castilleja Wallowensis Pennell
- Wallowa Lewisia - Lewisia Columbiana (Howell ex A. Gray) B.L. Rob. var. wallowensis C.L. Hitchc.
- Wallowa Needlegrass - Achnatherum Wallowaense Maze & K.A. Robson
- Wallowa Onion - Allium Tolmiei (Hook.) Baker ex S. Watson var. platyphyllum (Tidestr.) Ownbey
- Wallrocket - Diplotaxis Dc.
- Wallroth's Mycomicrothelia Lichen - Mycomicrothelia Wallrothii (Hepp) D. Hawksw.
- Wallroth's Trapeliopsis Lichen - Trapeliopsis Wallrothii (Flörke ex Spreng.) Hertel & Gotth. Schneid.
- Wallrue - Asplenium Ruta-muraria L.
- Wallrue - Asplenium Ruta-muraria L. var. cryptolepis (Fernald) Wherry
- Walnut - Juglans L.
- Walnut Spleenwort - Asplenium Juglandifolium Lam.
- Walpole's Poppy - Papaver Walpolei A.E. Porsild
- Walpole's Small Camas - Camassia Quamash (Pursh) Greene ssp. walpolei (Piper) Gould
- Walter's Aster - Symphyotrichum Walteri (Alexander) G.L. Nesom
- Walter's Groundcherry - Physalis Walteri Nutt.
- Walter's Sedge - Carex Striata Michx.
- Walter's Sedge - Carex Striata Michx. var. brevis L.H. Bailey
- Walter's Sedge - Carex Striata Michx. var. striata
- Waltham Creek Clarkia - Clarkia Modesta Jeps.
- Waltheria Americana L.
- Waltheria Indica L. var. americana (L.) R. Br. ex Hosaka
- Waltheria Pyrolifolia A. Gray
- Waltheria - Waltheria L.
- Wampi - Clausena Lansium (Lour.) Skeels
- Wand Airplant - Tillandsia Ariza-juliae L.B. Sm. & Jiménez
- Wand Blackroot - Pterocaulon Virgatum (L.) DC.
- Wand Blazing Star - Liatris Virgata Nutt.
- Wand Buckwheat - Eriogonum Roseum Durand & Hilg.
- Wand Butterflybush - Buddleja Racemosa Torr.
- Wand Butterflybush - Buddleja Racemosa Torr. ssp. incana (Torr.) Norm.
- Wand Butterflybush - Buddleja Racemosa Torr. ssp. racemosa
- Wand Dewberry - Rubus Arcuans Fernald & H. St. John
- Wand Fleabane - Erigeron Oxyphyllus Greene
- Wand Goldenrod - Solidago Stricta Aiton
- Wand Holdback - Hoffmannseggia Microphylla Torr.
- Wand Lespedeza - Lespedeza Virgata (Thunb.) DC.
- Wand Lessingia - Lessingia Virgata A. Gray
- Wand Lessingia - Lessingia Virgata A. Gray var. glomerata (Greene) J.T. Howell
- Wand Lessingia - Lessingia Virgata A. Gray var. virgata
- Wand Lythrum - Lythrum Lineare L.
- Wand Mullein - Verbascum Virgatum Stokes
- Wand Riverhemp - Sesbania Virgata (Cav.) Poir.
- Wand Sage - Salvia Virgata Jacq.
- Wand Tarbush - Holocarpha Virgata (A. Gray) D.D. Keck ssp. elongata D.D. Keck
- Wand Wirelettuce - Stephanomeria Virgata Benth. ssp. pleurocarpa (Greene) Gottlieb
- Wand Woollystar - Eriastrum Virgatum (Benth.) H. Mason
- Wandering Vetch - Vicia Peregrina L.
- Wandflower - Sparaxis Ker Gawl.
- Wandflower - Sparaxis Tricolor (Schneev.) Ker Gawl.
- Wandoo - Eucalyptus Wandoo Blakely
- Ward's Beardtongue - Penstemon Wardii A. Gray
- Ward's Bladderpod - Lesquerella Wardii S. Watson
- Ward's False Goldenweed - Oonopsis Wardii (A. Gray) Greene
- Ward's Milkvetch - Astragalus Wardii A. Gray
- Ward's Saltbush - Atriplex Wardii Standl.
- Ware's Hairsedge - Bulbostylis Warei (Torr.) C.B. Clarke
- Warea Auriculata Shinners
- Warm Springs Hawthorn - Crataegus Limata Beadle
- Warminster Broom - Cytisus ×praecox Bean
- Warner Mountains Bedstraw - Galium Serpenticum Dempster ssp. warnerense Dempster & Ehrend.
- Warner Springs Lessingia - Lessingia Glandulifera A. Gray var. tomentosa (Greene) Ferris
- Warner's Dodder - Cuscuta Warneri Yunck.
- Warner's Hawthorn - Crataegus Warneri Sarg.
- Warnock's Fishhook Cactus - Echinomastus Warnockii (L.D. Benson) Glass & R.A. Foster
- Warnock's Grama - Bouteloua Warnockii Gould & Kapadia
- Warnock's Prairie Clover - Dalea Bartonii Barneby
- Warnock's Prairie Clover - Dalea Wrightii A. Gray var. warnockii (Tharp & F.A. Barkley) B.L. Turner
- Warnock's Ragwort - Senecio Warnockii Shinners
- Warnock's Rockdaisy - Perityle Warnockii A. Powell
- Warnock's Snakewood - Condalia Warnockii M.C. Johnst.
- Warnock's Snakewood - Condalia Warnockii M.C. Johnst. var. warnockii
- Warnock's Water-willow - Justicia Warnockii B.L. Turner
- Warnstorf's Sphagnum - Sphagnum Warnstorfii Russow
- Warnstorfia Crassicostata (Janssens) H.A. Crum & L.E. Anderson
- Warnstorfia Exannulata (Schimp.) Loeske var. exannulata
- Warnstorfia Exannulata (Schimp.) Loeske var. purpurascens (Schimp.) Tuom. & T. Kop.
- Warnstorfia Moss - Warnstorfia Exannulata (Schimp.) Loeske
- Warnstorfia Moss - Warnstorfia Fluitans (Hedw.) Loeske
- Warnstorfia Moss - Warnstorfia Fluitans (Hedw.) Loeske var. falcata (Sanio ex C.E.O. Jensen) H.A. Crum &
- Warnstorfia Moss - Warnstorfia Fluitans (Hedw.) Loeske var. fluitans
- Warnstorfia Moss - Warnstorfia Loeske
- Warnstorfia Moss - Warnstorfia Procera (Renauld & Arnell) Tuom. & T. Kop.
- Warnstorfia Moss - Warnstorfia Pseudosarmentosa (Cardot & Thér.) Tuom. & T. Kop.
- Warnstorfia Moss - Warnstorfia Pseudostraminea (Müll. Hal.) Tuom. & T. Kop.
- Warnstorfia Moss - Warnstorfia Trichophylla (Warnst.) Tuom. & T. Kop.
- Warscewiczella Flabelliformis (Sw.) Cogn.
- Wart Lichen - Porina Amygdalina Müll. Arg.
- Wart Lichen - Porina Heterospora (Fink) R.C. Harris
- Wart Lichen - Porina Lectissima (Fr.) Zahlbr.
- Wart Lichen - Porina Müll. Arg.
- Wart Lichen - Porina Nucula Ach.
- Wart Lichen - Porina Rhaphidosperma Müll. Arg.
- Wart Lichen - Porina Salicina Müll. Arg.
- Wart Lichen - Pyrenula Ach.
- Wart Lichen - Pyrenula Acutalis R.C. Harris
- Wart Lichen - Pyrenula Anomala (Ach.) Vain.
- Wart Lichen - Pyrenula Aquila R.C. Harris
- Wart Lichen - Pyrenula Aspistea (Ach.) Ach.
- Wart Lichen - Pyrenula Astroidea (Fée) R.C. Harris
- Wart Lichen - Pyrenula Cerina Eschw.
- Wart Lichen - Pyrenula Citriformis R.C. Harris
- Wart Lichen - Pyrenula Cocoes Müll. Arg.
- Wart Lichen - Pyrenula Concatervans (Nyl.) R.C. Harris
- Wart Lichen - Pyrenula Confoederata R.C. Harris
- Wart Lichen - Pyrenula Corticata (Müll. Arg.) R.C. Harris
- Wart Lichen - Pyrenula Cruenta (Mont.) Vain.
- Wart Lichen - Pyrenula Cruentata (Müll. Arg.) R.C. Harris
- Wart Lichen - Pyrenula Cuyabensis (Malme) R.C. Harris
- Wart Lichen - Pyrenula Erumpens R.C. Harris
- Wart Lichen - Pyrenula Falsaria (Zahlbr.) R.C. Harris
- Wart Lichen - Pyrenula Laevigata (Pers.) Arnold
- Wart Lichen - Pyrenula Leucostoma Ach.
- Wart Lichen - Pyrenula Lucifera R.C. Harris
- Wart Lichen - Pyrenula Macularis (Zahlbr.) R.C. Harris
- Wart Lichen - Pyrenula Maculata (R.C. Harris) R.C. Harris
- Wart Lichen - Pyrenula Martinicana (Vain.) R.C. Harris
- Wart Lichen - Pyrenula Microcarpa Müll. Arg.
- Wart Lichen - Pyrenula Microtheca R.C. Harris
- Wart Lichen - Pyrenula Ochraceoflava (Nyl.) R.C. Harris
- Wart Lichen - Pyrenula Ochraceoflavens (Nyl.) R.C. Harris
- Wart Lichen - Pyrenula Oleosa R.C. Harris
- Wart Lichen - Pyrenula Pseudobufonia (Rehm) R.C. Harris
- Wart Lichen - Pyrenula Punctella (Nyl.) Trevis.
- Wart Lichen - Pyrenula Pyrenuloides (Mont.) R.C. Harris
- Wart Lichen - Pyrenula Quassiaecola Fée
- Wart Lichen - Pyrenula Rubrostoma R.C. Harris
- Wart Lichen - Pyrenula Santensis (Eschw.) Müll. Arg.
- Wart Lichen - Pyrenula Septicollaris (Eschw.) R.C. Harris
- Wart Lichen - Pyrenula Subelliptica (Tuck.) R.C. Harris
- Wart Lichen - Pyrenula Subferruginea (Malme) R.C. Harris
- Wart Lichen - Pyrenula Tenuisepta R.C. Harris
- Wart Lichen - Pyrenula Thelomorpha Tuck.
- Wart Lichen - Staurothele Catalepta (Ach.) Blomb. & Forss.
- Wart Lichen - Staurothele Clopimoides (Arnold) J. Stein
- Wart Lichen - Staurothele Diffractella (Nyl.) Tuck.
- Wart Lichen - Staurothele Discedens (Nyl.) Zahlbr.
- Wart Lichen - Staurothele Fissa (Taylor) Zwackh
- Wart Lichen - Staurothele Lecideoides de Lesd.
- Wart Lichen - Staurothele Norman
- Wart Lichen - Staurothele Rupifraga (A. Massal.) Arnold
- Wart Lichen - Staurothele Tenuissima Degel.
- Wart Lichen - Verrucaria Acrotella Ach.
- Wart Lichen - Verrucaria Aethiobola Wahlenb.
- Wart Lichen - Verrucaria Amphibia Clemente
- Wart Lichen - Verrucaria Amylacea Hepp
- Wart Lichen - Verrucaria Aquilella Nyl.
- Wart Lichen - Verrucaria Caerulea DC.
- Wart Lichen - Verrucaria Calciseda DC.
- Wart Lichen - Verrucaria Canella Nyl.
- Wart Lichen - Verrucaria Cataleptoides (Nyl.) Nyl.
- Wart Lichen - Verrucaria Ceuthocarpa Wahlenb.
- Wart Lichen - Verrucaria Dacryodes Nyl.
- Wart Lichen - Verrucaria Deversa Vain.
- Wart Lichen - Verrucaria Ditmarsica Erichsen
- Wart Lichen - Verrucaria Elaeomelaena (A. Massal.) Arnold
- Wart Lichen - Verrucaria Fuscella (Turner) Winch
- Wart Lichen - Verrucaria Fusconigrescens Nyl.
- Wart Lichen - Verrucaria Glaucovirens Grummann
- Wart Lichen - Verrucaria Halizoa Leight.
- Wart Lichen - Verrucaria Hydrela Ach.
- Wart Lichen - Verrucaria Internigrescens (Nyl.) Erichsen
- Wart Lichen - Verrucaria Iovensis Servit
- Wart Lichen - Verrucaria Lecideoides (A. Massal.) Trevis.
- Wart Lichen - Verrucaria Macrostoma Dufour ex DC.
- Wart Lichen - Verrucaria Margacea (Wahlenb.) Wahlenb.
- Wart Lichen - Verrucaria Marmorea (Scop.) Arnold
- Wart Lichen - Verrucaria Maura Wahlenb.
- Wart Lichen - Verrucaria Melas Herre
- Wart Lichen - Verrucaria Mucosa Wahlenb.
- Wart Lichen - Verrucaria Muralis Ach.
- Wart Lichen - Verrucaria Nigrescens Pers.
- Wart Lichen - Verrucaria Nigrescentoidea Fink
- Wart Lichen - Verrucaria Obnigrescens Nyl.
- Wart Lichen - Verrucaria Phaeothelena Th. Fr.
- Wart Lichen - Verrucaria Pinguicula A. Massal.
- Wart Lichen - Verrucaria Prominula Nyl.
- Wart Lichen - Verrucaria Pseudonigrescens Servit
- Wart Lichen - Verrucaria Rheitrophila Zschacke
- Wart Lichen - Verrucaria Ruderella Nyl.
- Wart Lichen - Verrucaria Rupestris Schrad.
- Wart Lichen - Verrucaria Schrad.
- Wart Lichen - Verrucaria Silicicola Fink
- Wart Lichen - Verrucaria Sorbicola Servit
- Wart Lichen - Verrucaria Sphinctrina Ach.
- Wart Lichen - Verrucaria Striatula Wahlenb.
- Wart Lichen - Verrucaria Subglaucina de Lesd.
- Wart Lichen - Verrucaria Submuralis Nyl.
- Wart Lichen - Verrucaria Tectorum (A. Massal.) Körb.
- Wart Lichen - Verrucaria Umbrinula Nyl.
- Wart Lichen - Verrucaria Viridula (Schrad.) Ach.
- Wartleaf Ceanothus - Ceanothus Papillosus Torr. & A. Gray
- Wartleaf Ceanothus - Ceanothus Papillosus Torr. & A. Gray var. papillosus
- Wartleaf Ceanothus - Ceanothus Papillosus Torr. & A. Gray var. roweanus McMinn
- Wartremoving Herb - Murdannia Keisak (Hassk.) Hand.-Maz.
- Warty Bedstraw - Galium Verrucosum Huds.
- Warty Caltrop - Kallstroemia Parviflora J.B.S. Norton
- Warty Panicgrass - Panicum Verrucosum Muhl.
- Warty Sedge - Carex Verrucosa Muhl.
- Warty Spurge - Euphorbia Spathulata Lam.
- Wartycabbage - Bunias L.
- Wasabi - Wasabia Japonica (Miq.) Matsum.
- Wasabia - Wasabia Matsum.
- Wasatch Aster - Eurybia Wasatchensis (M.E. Jones) G.L. Nesom
- Wasatch Beardtongue - Penstemon Cyananthus Hook.
- Wasatch Beardtongue - Penstemon Cyananthus Hook. var. cyananthus
- Wasatch Beardtongue - Penstemon Cyananthus Hook. var. subglaber (A. Gray) N.H. Holmgren
- Wasatch Bluegrass - Poa Arnowiae Soreng
- Wasatch Desertparsley - Lomatium Bicolor (S. Watson) J.M. Coult. & Rose
- Wasatch Desertparsley - Lomatium Bicolor (S. Watson) J.M. Coult. & Rose var. bicolor
- Wasatch Desertparsley - Lomatium Bicolor (S. Watson) J.M. Coult. & Rose var. leptocarpum (Torr. & A. Gray
- Wasatch Rockcress - Arabis Lasiocarpa Rollins
- Washerwoman - Alternanthera Caracasana Kunth
- Washington Beardtongue - Penstemon Washingtonensis D.D. Keck
- Washington Cracked Lichen - Acarospora Washingtonensis H. Magn.
- Washington Fan Palm - Washingtonia Robusta H. Wendl.
- Washington Fescue - Festuca Washingtonica Alexeev
- Washington Hawthorn - Crataegus Phaenopyrum (L. f.) Medik.
- Washington Jacob's-ladder - Polemonium Pectinatum Greene
- Washington Lily - Lilium Washingtonianum Kellogg
- Washington Lily - Lilium Washingtonianum Kellogg ssp. washingtonianum
- Washington Monkeyflower - Mimulus Washingtonensis Gandog.
- Washington Physcomitrium Moss - Physcomitrium Washingtoniense H.A. Crum & L.E. Anderson
- Washington Springbeauty - Claytonia Washingtoniana (Suksd.) Suksd.
- Washington Twinpod - Physaria Alpestris Suksd.
- Washingtonia Claytonii (Michx.) Britton
- Washingtonia Divaricata Britton
- Washingtonia Filamentosa (Fenzi) Kuntze
- Washingtonia Filifera (Linden ex André) H. Wendl. var. robusta Parish
- Washingtonia Gracilis Parish
- Washingtonia Longistylis (Torr.) Britton
- Washingtonia Obtusa J.M. Coult. & Rose
- Washingtonia Purpurea J.M. Coult. & Rose
- Washingtonia Sonorae S. Watson
- Washoe Combleaf - Polyctenium Williamsiae Rollins
- Washoe Lupine - Lupinus Lyallii A. Gray ssp. washoensis (A. Heller) Cox
- Washoe Phacelia - Phacelia Curvipes Torr. ex S. Watson
- Washoe Pine - Pinus Ponderosa Lawson & C. Lawson var. washoensis (H. Mason & Stockw.) J.R. Hal
- Wassuk Range Beardtongue - Penstemon Rubicundus D.D. Keck
- Wassuk Range Bladderpod - Lesquerella Cordiformis (Rollins) Rollins & Shaw
- Watauga Porella - Porella Wataugensis (Sull.) Underw.
- Watauga River Blackberry - Rubus Immanis Ashe
- Water Arum - Calla Palustris L.
- Water Birch - Betula Occidentalis Hook.
- Water Chestnut - Trapa L.
- Water Chestnut - Trapa Natans L.
- Water Cowbane - Oxypolis Filiformis (Walter) Britton
- Water Cracked Lichen - Acarospora Immersa Fink
- Water Dawnflower - Stylisma Aquatica (Walter) Raf.
- Water Dead And Awake - Neptunia Plena (L.) Benth.
- Water Disc Lichen - Buellia Immersa Lynge
- Water Figwort - Scrophularia Umbrosa Dumort.
- Water Foxtail - Alopecurus Geniculatus L.
- Water Foxtail - Alopecurus Geniculatus L. var. geniculatus
- Water Hemlock - Cicuta L.
- Water Hickory - Carya Aquatica (Michx. f.) Nutt.
- Water Horsetail - Equisetum Fluviatile L.
- Water Howellia - Howellia Aquatilis A. Gray
- Water Hyacinth - Eichhornia Kunth
- Water Jacket - Lycium Andersonii A. Gray
- Water Jacket - Lycium Andersonii A. Gray var. andersonii
- Water Jacket - Lycium Andersonii A. Gray var. deserticola (C.L. Hitchc.) C.L. Hitchc. ex Munz
- Water Jacket - Lycium Andersonii A. Gray var. wrightii A. Gray
- Water Knotweed - Polygonum Amphibium L.
- Water Lettuce - Pistia Stratiotes L.
- Water Locust - Gleditsia Aquatica Marshall
- Water Mampoo - Pisonia Subcordata Sw.
- Water Mannagrass - Glyceria Fluitans (L.) R. Br.
- Water Medick - Medicago Littoralis Rhode ex Loisel.
- Water Minerslettuce - Montia Chamissoi (Ledeb. ex Spreng.) Greene
- Water Mint - Mentha Aquatica L.
- Water Mudwort - Limosella Aquatica L.
- Water Oak - Quercus Nigra L.
- Water Parsely - Oenanthe Sarmentosa C. Presl ex DC.
- Water Paspalum - Paspalum Modestum Mez
- Water Plantain - Alisma L.
- Water Pygmyweed - Crassula Aquatica (L.) Schoenl.
- Water Ragwort - Senecio Aquaticus Hill
- Water Ragwort - Senecio Aquaticus Hill ssp. barbareifolius (Wimm. & Grab.) S.M. Walters
- Water Ragwort - Senecio Hydrophilus Nutt.
- Water Sedge - Carex Aquatilis Wahlenb.
- Water Sedge - Carex Aquatilis Wahlenb. var. aquatilis
- Water Sedge - Carex Aquatilis Wahlenb. var. stans (Drejer) Boott
- Water Smartweed - Polygonum Amphibium L. var. stipulaceum Coleman
- Water Snowflake - Nymphoides Indica (L.) Kuntze
- Water Soldiers - Stratiotes Aloides L. [excluded]
- Water Soldiers - Stratiotes L.
- Water Spangles - Salvinia Minima Baker
- Water Speedwell - Veronica Anagallis-aquatica L.
- Water Sphagnum - Sphagnum Inundatum Russow
- Water Toothleaf - Stillingia Aquatica Chapm.
- Water Trumpet - Cryptocoryne Fisch. ex Wydl.
- Water Tupelo - Nyssa Aquatica L.
- Water Wattle - Acacia Retinodes Schltdl.
- Water Whorlgrass - Catabrosa Aquatica (L.) P. Beauv.
- Water Whorlgrass - Catabrosa Aquatica (L.) P. Beauv. var. aquatica
- Water Yam - Dioscorea Alata L.
- Water-gum - Tristaniopsis Laurina (Sm.) Peter G. Wilson & J.T. Waterh.
- Water-lily Tulip - Tulipa Kaufmanniana Regel
- Water-starwort - Callitriche L.
- Water-trumpet - Cryptocoryne Walkeri Schott
- Water-willow - Justicia L.
- Water-wisteria - Hygrophila Difformis (L. f.) Blume
- Waterawlwort - Subularia Aquatica L.
- Waterbuttons - Cotula L.
- Waterclover - Marsilea L.
- Watercress - Nasturtium Officinale W.T. Aiton
- Watercrown Grass - Paspalidium Stapf
- Waterdropwort - Oenanthe L.
- Waterer's Cotoneaster - Cotoneaster ×watereri Exell
- Waterfall Copper Moss - Mielichhoferia Macrocarpa (Hook.) Bruch & Schimp. ex A. Jaeger
- Waterfall False Buttercup - Kumlienia Hystricula (A. Gray) Greene
- Waterfall's Milkvetch - Astragalus Waterfallii Barneby
- Waterfall's Sedge - Carex Latebracteata Waterf.
- Watergrass - Bulbostylis Barbata (Rottb.) C.B. Clarke
- Watergrass - Hygroryza Nees
- Watergrass - Luziola Juss.
- Waterhorehound - Lycopus L.
- Waterhorehound - Lycopus ×sherardii Steele (pro sp.)
- Waterhyssop - Bacopa Aubl.
- Waterhyssop - Bacopa Procumbens (Mill.) Greenman
- Waterleaf - Hydrophyllum L.
- Waterleaf Phacelia - Phacelia Hydrophylloides Torr. ex A. Gray
- Waterlily - Nymphaea L.
- Waterlily - Nymphaea ×daubenyana W.T. Baxter ex Daubeny
- Waterlily - Nymphaea ×marliacea Marliac
- Waterlily - Nymphaea ×thiona Ward
- Waterloving Hawthorn - Crataegus Limnophila Sarg.
- Watermeal - Wolffia Horkel ex Schleid.
- Watermelon - Citrullus Lanatus (Thunb.) Matsum. & Nakai
- Watermelon - Citrullus Lanatus (Thunb.) Matsum. & Nakai var. citroides (L.H. Bailey) Mansf.
- Watermelon - Citrullus Lanatus (Thunb.) Matsum. & Nakai var. lanatus
- Watermelon - Citrullus Schrad.
- Watermelon Nightshade - Solanum Citrullifolium A. Braun
- Watermelon Nightshade - Solanum Citrullifolium A. Braun var. citrullifolium
- Watermelon Nightshade - Solanum Citrullifolium A. Braun var. setigerum Bartlett
- Watermilfoil - Myriophyllum L.
- Watermoss - Salvinia Ség.
- Waternymph - Najas L.
- Waterparsnip - Berula Besser ex W.D.J. Koch
- Waterparsnip - Sium L.
- Waterplantain - Baldellia Parl.
- Waterplantain Buttercup - Ranunculus Alismifolius Geyer ex Benth. var. montanus S. Watson
- Waterplantain Spearwort - Ranunculus Ambigens S. Watson
- Waterpod - Hydrolea Quadrivalvis Walter
- Waterpoppy - Hydrocleys Nymphoides (Humb. & Bonpl. ex Willd.) Buchenau
- Waterpurslane - Didiplis Diandra (Nutt. ex DC.) Alph. Wood
- Watershield - Brasenia Schreberi J.F. Gmel.
- Waterspider Bog Orchid - Habenaria Repens Nutt.
- Watersprite - Ceratopteris Thalictroides (L.) Brongn.
- Waterthread Pondweed - Potamogeton Diversifolius Raf.
- Waterthyme - Hydrilla Verticillata (L. f.) Royle
- Waterton Grapefern - Botrychium ×watertonense W.H. Wagner
- Waterton Lakes Cryptantha - Cryptantha Sobolifera Payson
- Waterweed - Elodea Michx.
- Waterwheel Plant - Aldrovanda Vesiculosa L.
- Waterwort - Elatine Hydropiper L.
- Waterwort - Elatine L.
- Watery Roseapple - Syzygium Aqueum (Burm. f.) Alston
- Watson's Amaranth - Amaranthus Watsonii Standl.
- Watson's Bedstraw - Galium Watsonii (A. Gray) A. Heller
- Watson's Brickellbush - Brickellia Microphylla (Nutt.) A. Gray var. watsonii (B.L. Rob.) S.L. Welsh
- Watson's Buckwheat - Eriogonum Watsonii Torr. & A. Gray
- Watson's Cryptantha - Cryptantha Watsonii (A. Gray) Greene
- Watson's Desertparsley - Lomatium Watsonii (J.M. Coult. & Rose) J.M. Coult. & Rose
- Watson's Dutchman's Pipe - Aristolochia Watsonii Wooton & Standl.
- Watson's False Clapdaisy - Pseudoclappia Watsonii A. Powell & B.L. Turner
- Watson's Fleabane - Erigeron Watsonii (A. Gray) Cronquist
- Watson's Goldenbush - Ericameria Watsonii (A. Gray) G.L. Nesom
- Watson's Goosefoot - Chenopodium Watsonii A. Nelson
- Watson's Milkwort - Polygala Watsonii Chod.
- Watson's Oxytheca - Oxytheca Watsonii Torr. & A. Gray
- Watson's Penstemon - Penstemon Watsonii A. Gray
- Watson's Plum - Prunus Angustifolia Marshall var. watsonii (Sarg.) Waugh
- Watson's Prickly Phlox - Linanthus Watsonii (A. Gray) J.M. Porter & L.A. Johnson
- Watson's Saltbush - Atriplex Watsonii A. Nelson
- Watson's Snapdragon - Sairocarpus Watsonii (Vasey & Rose) D.A. Sutton
- Watson's Spikemoss - Selaginella Watsonii Underw.
- Watsonia Angusta auct. non Ker Gawl.
- Watsonia Bulbillifera Matthews & L. Bolus
- Wattapama - Poitea Florida (Vahl) Lavin
- Wattapama - Poitea Vent.
- Wattle Signalgrass - Urochloa Piligera (F. Muell. ex Benth.) R. Webster
- Wavewing - Pteryxia (nutt. ex Torr. & A. Gray) Nutt. ex J.M. Coult. & Rose
- Wavy Filmy Fern - Hymenophyllum Undulatum (Sw.) Sw.
- Wavy Hairgrass - Deschampsia Flexuosa (L.) Trin.
- Wavy Hairgrass - Deschampsia Flexuosa (L.) Trin. var. flexuosa
- Wavy Heliotrope - Heliotropium Ramosissimum (Lehm.) DC.
- Wavy Scaly Cloakfern - Astrolepis Sinuata (Lag. ex Sw.) Benham & Windham
- Wavy Scaly Cloakfern - Astrolepis Sinuata (Lag. ex Sw.) Benham & Windham ssp. sinuata
- Wavy-leaved Saltbush - Atriplex Undulata (Moq.) D. Dietr.
- Wavyleaf Aster - Symphyotrichum Undulatum (L.) G.L. Nesom
- Wavyleaf Barberry - Mahonia Pinnata (Lag.) Fedde
- Wavyleaf Beeblossom - Oenothera Sinuosa W.L. Wagner & Hoch
- Wavyleaf Blazingstar - Mentzelia Albescens (Gillies & Arn.) Griseb.
- Wavyleaf Buckbrush - Ceanothus Foliosus Parry var. medius McMinn
- Wavyleaf Ceanothus - Ceanothus Foliosus Parry
- Wavyleaf Ceanothus - Ceanothus Foliosus Parry var. foliosus
- Wavyleaf False Oxtongue - Blumea Sinuata (Lour.) Merr.
- Wavyleaf Indian Paintbrush - Castilleja Applegatei Fernald
- Wavyleaf Indian Paintbrush - Castilleja Applegatei Fernald ssp. applegatei
- Wavyleaf Indian Paintbrush - Castilleja Applegatei Fernald ssp. disticha (Eastw.) T.I. Chuang & Heckard
- Wavyleaf Indian Paintbrush - Castilleja Applegatei Fernald ssp. martinii (Abrams) T.I. Chuang & Heckard
- Wavyleaf Indian Paintbrush - Castilleja Applegatei Fernald ssp. pallida (Eastw.) T.I. Chuang & Heckard
- Wavyleaf Indian Paintbrush - Castilleja Applegatei Fernald ssp. pinetorum (Fernald) T.I. Chuang & Heckard
- Wavyleaf Mullein - Verbascum Sinuatum L.
- Wavyleaf Noseburn - Tragia Urens L.
- Wavyleaf Purple Coneflower - Echinacea Simulata R.L. McGregor
- Wavyleaf Sea Lavender - Limonium Sinuatum (L.) Mill.
- Wavyleaf Silktassel - Garrya Elliptica Douglas ex Lindl.
- Wavyleaf Snakeherb - Dyschoriste Crenulata Kobuski
- Wavyleaf Soap Plant - Chlorogalum Pomeridianum (DC.) Kunth
- Wavyleaf Soap Plant - Chlorogalum Pomeridianum (DC.) Kunth var. divaricatum (Lindl.) Hoover
- Wavyleaf Soap Plant - Chlorogalum Pomeridianum (DC.) Kunth var. minus Hoover
- Wavyleaf Soap Plant - Chlorogalum Pomeridianum (DC.) Kunth var. pomeridianum
- Wavyleaf Thelypody - Thelypodium Repandum Rollins
- Wavyleaf Thistle - Cirsium Undulatum (Nutt.) Spreng.
- Wavyleaf Thistle - Cirsium Undulatum (Nutt.) Spreng. var. undulatum
- Wavyleaf Thoroughwort - Chromolaena Sinuata (Lam.) R.M. King & H. Rob.
- Wavyleaf Twinevine - Funastrum Crispum (Benth.) Schltr.
- Wax Currant - Ribes Cereum Douglas
- Wax Currant - Ribes Cereum Douglas var. cereum
- Wax Currant - Ribes Cereum Douglas var. colubrinum C.L. Hitchc.
- Wax Mallow - Malvaviscus Arboreus Dill. ex Cav.
- Wax Mallow - Malvaviscus Arboreus Dill. ex Cav. var. arboreus
- Wax Mallow - Malvaviscus Arboreus Dill. ex Cav. var. drummondii (Torr. & A. Gray) Schery
- Wax Mallow - Malvaviscus Fabr.
- Wax Myrtle - Morella Cerifera (L.) Small
- Wax Palm - Ceroxylon Alpinum Bonpl. ex DC.
- Wax Tree - Toxicodendron Succedaneum (L.) Kuntze
- Waxberry - Morella Cordifolia (L.) Killick
- Waxflower - Etlingera Cevuga (Seem.) R.M. Sm.
- Waxflower - Etlingera Giseke
- Waxflower Shinleaf - Pyrola Elliptica Nutt.
- Waxfruit Mustard - Glaucocarpum Rollins
- Waxgourd - Benincasa Hispida (Thunb.) Cogn.
- Waxleaf Penstemon - Penstemon Nitidus Douglas ex Benth.
- Waxleaf Penstemon - Penstemon Nitidus Douglas ex Benth. var. nitidus
- Waxleaf Penstemon - Penstemon Nitidus Douglas ex Benth. var. polyphyllus (Pennell) Cronquist
- Waxweed - Cuphea P. Br.
- Waxy Bedstraw - Galium Glaucum L.
- Waxy Bonnet Orchid - Pleurothallis Pruinosa Lindl.
- Waxy Checkerbloom - Sidalcea Glaucescens Greene
- Waxy Coneflower - Rudbeckia Glaucescens Eastw.
- Waxy Mannagrass - Glyceria Declinata Brébiss.
- Waxy Saltbush - Atriplex Glauca L.
- Waxy Springparsley - Cymopterus Glaucus Nutt.
- Waxy Thoroughwort - Eupatorium Glaucescens Elliott
- Waxydogbane - Cycladenia Benth.
- Waxyfruit Hawthorn - Crataegus Pruinosa (Wendl. f.) K. Koch
- Waxyleaf Meadow-rue - Thalictrum Revolutum DC.
- Waxyleaf Nightshade - Solanum Glaucophyllum Desf.
- Waxyleaf Privet - Ligustrum Quihoui Carrière
- Wayfaringtree - Viburnum Lantana L.
- Waynea Californica Moberg
- Waynea Lichen - Waynea Moberg
- Wayside Aster - Eucephalus Vialis Bradshaw
- Weak Arctic Sedge - Carex Supina Willd. ex Wahlenb.
- Weak Arctic Sedge - Carex Supina Willd. ex Wahlenb. var. spaniocarpa (Steud.) B. Boivin
- Weak Bluegrass - Poa Infirma Kunth
- Weak Groundsel - Packera Debilis (Nutt.) W.A. Weber & Á. Löve
- Weak Jumby Pepper - Microtea Debilis Sw.
- Weak Plantain - Plantago Debilis R. Br.
- Weak Rush - Juncus Debilis A. Gray
- Weak Saxifrage - Saxifraga Rivularis L.
- Weak Sedge - Carex Laxa Wahlenb.
- Weak Signalgrass - Urochloa Oligobrachiata (Pilg.) Kartesz
- Weak Spurge - Euphorbia Tetrapora Engelm.
- Weak Stellate Sedge - Carex Seorsa Howe
- Weak-leaf Yucca - Yucca Flaccida Haw.
- Weak-nerved Sedge - Carex Infirminervia Naczi
- Weakleaf Bur Ragweed - Ambrosia Confertiflora DC.
- Weakstalk Bulrush - Schoenoplectiella Purshiana (Fernald) Lye
- Weakstem Cryptantha - Cryptantha Flaccida (Douglas ex Lehm.) Greene
- Weakstem Peperomia - Peperomia Cookiana C. DC.
- Weasel Phacelia - Phacelia Mustelina Coville
- Weaselsnout - Lagotis Glauca Gaertn.
- Weather Prophet - Dimorphotheca Pluvialis (L.) Moench
- Weatherby's Arrowhead - Sagittaria Graminea Michx. var. weatherbiana (Fernald) Bogin
- Weatherby's Spikemoss - Selaginella Weatherbiana R. Tryon
- Webber Needlegrass - Achnatherum Webberi (Thurb.) Barkworth
- Webber's Milkvetch - Astragalus Webberi A. Gray ex W.H. Brewer & S. Watson
- Weber's Century Plant - Agave Weberi Cels ex Poisson
- Weber's Cryptantha - Cryptantha Weberi I.M. Johnst.
- Weber's Draba - Draba Weberi R.A. Price & Rollins
- Weber's Mountain Lichen - Dimelaena Weberi Sheard
- Weber's Rim Lichen - Lecanora Weberi B.D. Ryan
- Weber's Saw-wort - Saussurea Weberi Hultén
- Weber's Thelenella Lichen - Thelenella Weberi H. Mayrh.
- Weber's Xanthoparmelia Lichen - Xanthoparmelia Weberi (Hale) Hale
- Weberaster Modestus (Lindl.) Á. Löve & D. Löve
- Weberaster Radulinus (A. Gray) Á. Löve & D. Löve
- Websteria Submersa (Sauvalle) Britton
- Wedelia Acapulcensis Kunth
- Wedelia Calycina Rich.
- Wedelia Calycina Rich. var. parviflora (Rich.) Alain
- Wedelia Cristata Standl.
- Wedelia Glauca (Ortega) Hoffm. ex Hicken
- Wedelia Gracilis Rich.
- Wedelia Hispida Kunth
- Wedelia Texana (A. Gray) B.L. Turner, nom. inval.
- Wedelia Trilobata (L.) Hitchc.
- Wedge Beggarticks - Bidens Cuneata Sherff
- Wedge Leaf-flower - Phyllanthus Orbicularis Kunth
- Wedge Sandmat - Chamaesyce Deltoidea (Engelm. ex Chapm.) Small
- Wedge Sandmat - Chamaesyce Deltoidea (Engelm. ex Chapm.) Small ssp. adhaerens (Small) Herndon
- Wedge Sandmat - Chamaesyce Deltoidea (Engelm. ex Chapm.) Small ssp. deltoidea
- Wedge Sandmat - Chamaesyce Deltoidea (Engelm. ex Chapm.) Small ssp. pinetorum (Small) Herndon
- Wedge Sandmat - Chamaesyce Deltoidea (Engelm. ex Chapm.) Small ssp. serpyllum (Small) Burch
- Wedge-leaf Hopbush - Dodonaea Viscosa (L.) Jacq. ssp. cuneata (Sm.) J.G. West
- Wedge-leaf Wattle - Acacia Pravissima F. Muell.
- Wedgeleaf - Calotis Cuneifolia R. Br.
- Wedgeleaf Dock - Rumex Frutescens Thouars
- Wedgeleaf Draba - Draba Cuneifolia Nutt. ex Torr. & A. Gray
- Wedgeleaf Draba - Draba Cuneifolia Nutt. ex Torr. & A. Gray var. cuneifolia
- Wedgeleaf Draba - Draba Cuneifolia Nutt. ex Torr. & A. Gray var. integrifolia S. Watson
- Wedgeleaf Eryngo - Eryngium Cuneifolium Small
- Wedgeleaf Fleabane - Erigeron Cuneifolius DC.
- Wedgeleaf Horkelia - Horkelia Cuneata Lindl.
- Wedgeleaf Horkelia - Horkelia Cuneata Lindl. ssp. cuneata
- Wedgeleaf Horkelia - Horkelia Cuneata Lindl. ssp. puberula (Greene) D.D. Keck
- Wedgeleaf Horkelia - Horkelia Cuneata Lindl. ssp. sericea (A. Gray) D.D. Keck
- Wedgeleaf - Phyla Cuneifolia (Torr.) Greene
- Wedgeleaf Prairie Clover - Dalea Emarginata (Torr. & A. Gray) Shinners
- Wedgeleaf Primrose - Primula Cuneifolia Ledeb.
- Wedgeleaf Primrose - Primula Cuneifolia Ledeb. ssp. cuneifolia
- Wedgeleaf Primrose - Primula Cuneifolia Ledeb. ssp. saxifragifolia (Lehm.) W.W. Sm. & G. Forrest
- Wedgeleaf Saxifrage - Saxifraga Adscendens L.
- Wedgeleaf Spleenwort - Asplenium Cuneatum Lam.
- Wedgeleaf Spurge - Euphorbia Longicruris Scheele
- Wedgeleaf Violet - Viola Cuneata S. Watson
- Wedgeleaf Willow - Salix Sphenophylla Skvort.
- Wedgescale Saltbush - Atriplex Truncata (Torr. ex S. Watson) A. Gray
- Wedgescale - Sphenopholis Scribn.
- Wedgescale - Sphenopholis ×pallens (Biehler) Scribn. (pro sp.)
- Weed Silene - Silene Conoidea L.
- Weed's Mariposa Lily - Calochortus Weedii Alph. Wood
- Weed's Mariposa Lily - Calochortus Weedii Alph. Wood var. intermedius Ownbey
- Weed's Mariposa Lily - Calochortus Weedii Alph. Wood var. vestus Purdy
- Weed's Mariposa Lily - Calochortus Weedii Alph. Wood var. weedii
- Weedin's Hedgehog Cactus - Echinocereus Viridiflorus Engelm. var. weedinii (Leuck ex W. Blum & Mich. Lange) A.D. Zimm
- Weedy Brome - Bromus Alopecuros Poir.
- Weedy Dogfennel - Chamaemelum Mixtum (L.) All.
- Weedy Dwarfdandelion - Krigia Caespitosa (Raf.) K.L. Chambers
- Weeping Alkaligrass - Puccinellia Distans (Jacq.) Parl.
- Weeping Alkaligrass - Puccinellia Distans (Jacq.) Parl. ssp. borealis (Holmb.) W.E. Hughes
- Weeping Alkaligrass - Puccinellia Distans (Jacq.) Parl. ssp. distans
- Weeping Bottlebrush - Callistemon Viminalis (Sol. ex Gaertn.) Cheel [excluded]
- Weeping Brome - Bromus Frondosus (Shear) Wooton & Standl.
- Weeping Fern - Lepisorus Thunbergianus (Kaulf.) Ching
- Weeping Fig - Ficus Benjamina L.
- Weeping Fingergrass - Eustachys Distichophylla (Lag.) Nees
- Weeping Forsythia - Forsythia Suspensa (Thunb.) Vahl
- Weeping Grass - Microlaena R. Br.
- Weeping Grass - Microlaena Stipoides (Labill.) R. Br.
- Weeping Gum - Eucalyptus Sepulcralis F. Muell.
- Weeping Lovegrass - Eragrostis Curvula (Schrad.) Nees
- Weeping Willow - Salix Babylonica L.
- Weeping Willow - Salix ×sepulcralis Simonkai
- Weft Fern - Trichomanes Intricatum Farrar
- Weigel's Bryum Moss - Bryum Weigelii Spreng.
- Weigela Japonica Thunb. [excluded]
- Weigela - Weigela Thunb.
- Weigelia Schreb., orth. var.
- Weill's Lichenochora Lichen - Lichenochora Weillii (Werner) Hafellner & R. Sant.
- Weinmannia - Weinmannia Affinis A. Gray
- Weinmannia - Weinmannia L.
- Weiser's Milkvetch - Astragalus Beckwithii Torr. & A. Gray var. weiserensis M.E. Jones
- Weissia Andrewsii E.B. Bartram
- Weissia Controversa Hedw. var. longiseta (Lesq. & James) H.A. Crum, Steere & L.E. An
- Weissia Controversa Hedw. var. wolfii (Lesq. & James) H.A. Crum, Steere & L.E. Ander
- Weissia Glauca E.B. Bartram
- Weissia Ludoviciana (Sull.) Reese & B.A.E. Lemmon
- Weissia Microstoma (Hedw.) Müll. Hal.
- Weissia Moss - Weissia Hedw.
- Weissia Moss - Weissia Inoperculata (H.A. Crum) H.A. Crum, Steere & L.E. Anderson
- Weissia Muehlenbergiana (Sw.) Reese & B.A.E. Lemmon
- Weissia Occidentalis (Flow.) Stoneb.
- Weissia Perligulata Flow.
- Weissia Phascopsis R.H. Zander
- Weissia Rostellata (Hook. & Drumm.) Reese & B.A.E. Lemmon var. phascoides (Hook. &
- Weissia Sweetii E.B. Bartram
- Weissia Tortilis (Schwägr.) Müll. Hal.
- Weissia Viridula Hedw. ex Brid.
- Weissia Viridula Hedw. ex Brid. var. australis Austin
- Weissia Viridula Hedw. ex Brid. var. wolfii Lesq. & James
- Welch's Fontinalis Moss - Fontinalis Welchiana Allen
- Weld - Reseda Luteola L.
- Wells' Manzanita - Arctostaphylos Wellsii Knight
- Welsh Mudwort - Limosella Australis R. Br.
- Welsh Onion - Allium Fistulosum L.
- Welsh's Aster - Symphyotrichum Welshii (Cronquist) G.L. Nesom
- Welsh's Buckwheat - Eriogonum Capistratum Reveal var. welshii Reveal
- Welsh's Bugseed - Corispermum Welshii Mosyakin
- Welsh's Cryptantha - Cryptantha Welshii Thorne & Higgins
- Welsh's Milkweed - Asclepias Welshii N.H. Holmgren & P.K. Holmgren
- Welsh's Phacelia - Phacelia Welshii N.D. Atwood
- Welsh's Saltbush - Atriplex Welshii C.A. Hanson
- Wenatchee Desertparsley - Lomatium Cuspidatum Mathias & Constance
- Wenatchee Indian Paintbrush - Castilleja Elmeri Fernald
- Wenatchee Larkspur - Delphinium Viridescens Leiberg
- Wenatchee Valerian - Valeriana Columbiana Piper
- Wendt's Adder's-mouth Orchid - Malaxis Wendtii Salazar
- Wendt's Water Trumpet - Cryptocoryne Wendtii de Wit
- Weniger's Hedgehog Cactus - Echinocereus Pectinatus (Scheidw.) Engelm. var. wenigeri L.D. Benson
- Weniger's Hedgehog Cactus - Echinocereus Viridiflorus Engelm. var. neocapillus (D. Weniger) A.D. Zimmerman
- Werauhia Proctorii Cedeño-Mald.
- Werauhia Ringens (Griseb.) J.R. Grant
- Werauhia Sintenisii (Baker) J.R. Grant
- West African Albizzia - Albizia Adianthifolia (Schumach.) W. Wight
- West African Piassava Palm - Raphia Vinifera P. Beauv.
- West African Rubbertree - Ficus Vogelii (Miq.) Miq.
- West Humboldt Buckwheat - Eriogonum Anemophilum Greene
- West Indian Balsa - Ochroma Pyramidale (Cav. ex Lam.) Urb.
- West Indian Beaksedge - Rhynchospora Brachychaeta C. Wright
- West Indian Beggarticks - Bidens Cynapiifolia Kunth
- West Indian Bluestem - Hypogynium Nees
- West Indian Bluestem - Hypogynium Virgatum (Desv. ex Ham.) Dandy
- West Indian Bristlegrass - Setaria Setosa (Sw.) P. Beauv.
- West Indian Bristlegrass - Setaria Setosa (Sw.) P. Beauv. var. leiophylla (Nees) Arechav.
- West Indian Bristlegrass - Setaria Setosa (Sw.) P. Beauv. var. setosa
- West Indian Buckthorn - Frangula Sphaerosperma (Sw.) Kartesz & Gandhi
- West Indian Buckthorn - Frangula Sphaerosperma (Sw.) Kartesz & Gandhi ssp. longipes (M.C. Johnston & L.A. Johns
- West Indian Cherry - Prunus Myrtifolia (L.) Urb.
- West Indian Chinchweed - Pectis Linearis Llave
- West Indian Clearweed - Pilea Inaequalis (Juss. ex Poir.) Weddell
- West Indian Cock's Comb - Celosia Nitida Vahl
- West Indian Croton - Croton Stenophyllus Griseb.
- West Indian Dodder - Cuscuta Globulosa Benth.
- West Indian Dropseed - Sporobolus Indicus (L.) R. Br. var. pyramidalis (P. Beauv.) Veldkamp
- West Indian Dutchman's Pipe - Aristolochia Bilabiata L.
- West Indian Dwarf Polypody - Grammitis Nimbata (Jenman) Proctor
- West Indian False Box - Gyminda Latifolia (Sw.) Urb.
- West Indian False Buttonweed - Spermacoce Sintenisii (Urb.) Alain
- West Indian False Nettle - Boehmeria Repens (Griseb.) Weddell
- West Indian Fimbry - Fimbristylis Ferruginea (L.) Vahl
- West Indian Flatsedge - Cyperus Confertus Sw.
- West Indian Gherkin - Cucumis Anguria L.
- West Indian Gherkin - Cucumis Anguria L. var. anguria
- West Indian Gherkin - Cucumis Anguria L. var. longaculeatus J.H. Kirkbride
- West Indian Grape - Vitis Tiliifolia Humb. & Bonpl. ex Schult.
- West Indian Hairsedge - Bulbostylis Curassavica (Britton) Britton ex Kük.
- West Indian Joyweed - Alternanthera Crucis (Moq.) Boldingh
- West Indian Leach Orchid - Stelis Perpusilliflora Cogn.
- West Indian Livingvase - Aechmea Lingulata (L.) Baker
- West Indian Mahogany - Swietenia Mahagoni (L.) Jacq.
- West Indian Marsh Grass - Hymenachne Amplexicaulis (Rudge) Nees
- West Indian Meadowbeauty - Rhexia Cubensis Griseb.
- West Indian Milkberry - Chiococca Alba (L.) Hitchc.
- West Indian Milkpea - Galactia Dubia DC.
- West Indian Milkwort - Polygala Hecatantha Urb.
- West Indian Nightshade - Solanum Ptycanthum Dunal
- West Indian Panicgrass - Panicum Diffusum Sw.
- West Indian Peperomia - Peperomia Hernandiifolia (Vahl) A. Dietr.
- West Indian Pinkroot - Spigelia Anthelmia L.
- West Indian Porterweed - Stachytarpheta Strigosa Vahl
- West Indian Raspberry - Rubus Rosifolius Sm.
- West Indian Rattlebox - Crotalaria Trichotoma Bojer
- West Indian Sage - Salvia Occidentalis Sw.
- West Indian Satinwood - Zanthoxylum Flavum Vahl
- West Indian Shrubverbena - Lantana Urticoides Hayek
- West Indian Soldierbush - Tournefortia Scabra Lam.
- West Indian Spiderlily - Hymenocallis Expansa (Herb.) Herb.
- West Indian Spleenwort - Asplenium Pteropus Kaulf.
- West Indian Spongeplant - Limnobium Laevigatum (Humb. & Bonpl. ex Willd.) Heine
- West Indian Spurge - Euphorbia Oerstediana (Klotzsch & Garcke) Boiss.
- West Indian Starwort - Stellaria Antillana Urb.
- West Indian Sumac - Brunellia Comocladiifolia Humb. & Bonpl.
- West Indian Sumac - Brunellia Comocladiifolia Humb. & Bonpl. ssp. domingensis Cuatrec.
- West Indian Swallow-wort - Cynanchum Lineare (Bello) Alain, nom. inq.
- West Indian Tonguefern - Elaphoglossum Crinitum (L.) Christ
- West Indian Treebine - Cissus Tuberculata Jacq.
- West Indian Treefern - Cyathea Arborea (L.) Sm.
- West Indian Tufted Airplant - Guzmania Monostachia (L.) Rusby ex Mez
- West Indian Vanilla - Vanilla Pompona Schiede
- West Indian Walnut - Juglans Jamaicensis C. DC.
- West Indian Water-willow - Justicia Mirabiloides Lam.
- West Indian Woodnettle - Laportea Aestuans (L.) Chew
- West Indian Woodsorrel - Oxalis Intermedia A. Rich.
- West Indies Sandmat - Chamaesyce Hepatica (Urb. & Ekman) D.G. Burch
- West Virginia Blackberry - Rubus Concameratus H.A. Davis & T. Davis
- West Virginia Dewberry - Rubus Particularis L.H. Bailey
- West's Flax - Linum Westii C.M. Rogers
- Western Arctic Shootingstar - Dodecatheon Frigidum Cham. & Schltdl.
- Western Aster - Symphyotrichum Ascendens (Lindl.) G.L. Nesom
- Western Astomum Moss - Astomum Occidentale Flow.
- Western Australian Floodedgum - Eucalyptus Rudis Endl.
- Western Azalea - Rhododendron Occidentale (Torr. & A. Gray) A. Gray
- Western Azalea - Rhododendron Occidentale (Torr. & A. Gray) A. Gray var. occidentale
- Western Azalea - Rhododendron Occidentale (Torr. & A. Gray) A. Gray var. paludosum Jeps.
- Western Beard Lichen - Usnea Occidentalis Mot.
- Western Bird's-foot Trefoil - Lotus Scoparius (Nutt.) Ottley var. brevialatus Ottley
- Western Black Currant - Ribes Hudsonianum Richardson var. petiolare (Douglas) Jancz.
- Western Bladderpod - Lesquerella Occidentalis S. Watson
- Western Bladderpod - Lesquerella Occidentalis S. Watson ssp. cinerascens (Maguire & A.H. Holmgren) Rollins & S
- Western Bladderpod - Lesquerella Occidentalis S. Watson ssp. occidentalis
- Western Blanketflower - Gaillardia Spathulata A. Gray
- Western Blue Virginsbower - Clematis Occidentalis (Hornem.) DC.
- Western Blue Virginsbower - Clematis Occidentalis (Hornem.) DC. var. dissecta (C.L. Hitchc.) J. Pringle
- Western Blue Virginsbower - Clematis Occidentalis (Hornem.) DC. var. grosseserrata (Rydb.) J. Pringle
- Western Blue Virginsbower - Clematis Occidentalis (Hornem.) DC. var. occidentalis
- Western Blue-eyed Grass - Sisyrinchium Bellum S. Watson
- Western Bluegrass - Poa Suksdorfii (Beal) Vasey ex Piper
- Western Bog Aster - Symphyotrichum Spathulatum (Lindl.) G.L. Nesom var. yosemitanum (A. Gray) G.L. Nesom
- Western Bog Yellowcress - Rorippa Palustris (L.) Besser ssp. occidentalis (S. Watson) Abrams
- Western Brackenfern - Pteridium Aquilinum (L.) Kuhn
- Western Brackenfern - Pteridium Aquilinum (L.) Kuhn var. latiusculum (Desv.) Underw. ex A. Heller
- Western Brackenfern - Pteridium Aquilinum (L.) Kuhn var. pseudocaudatum (Clute) A. Heller
- Western Bugbane - Trautvetteria Caroliniensis (Walter) Vail var. occidentalis (A. Gray) C.L. Hitchc.
- Western Burning Bush - Euonymus Occidentalis Nutt. ex Torr.
- Western Burning Bush - Euonymus Occidentalis Nutt. ex Torr. var. occidentalis
- Western Burning Bush - Euonymus Occidentalis Nutt. ex Torr. var. parishii (Trel.) Jeps.
- Western Buttercup - Ranunculus Occidentalis Nutt. var. hexasepalus L.D. Benson
- Western Buttercup - Ranunculus Occidentalis Nutt.
- Western Buttercup - Ranunculus Occidentalis Nutt. var. brevistylis Greene
- Western Buttercup - Ranunculus Occidentalis Nutt. var. occidentalis
- Western Catchfly - Silene Occidentalis S. Watson
- Western Catchfly - Silene Occidentalis S. Watson ssp. longistipitata C.L. Hitchc. & Maguire
- Western Catchfly - Silene Occidentalis S. Watson ssp. occidentalis
- Western Cherry Laurel - Prunus Occidentalis Sw.
- Western Chokecherry - Prunus Virginiana L. var. demissa (Nutt.) Torr.
- Western Cliff Fern - Woodsia Obtusa (Spreng.) Torr. ssp. occidentalis Windham
- Western Clubmoss - Huperzia Occidentalis (Clute) Kartesz & Gandhi
- Western Columbine - Aquilegia Formosa Fisch. ex DC.
- Western Coneflower - Rudbeckia Occidentalis Nutt.
- Western Cordilleran Bunchberry - Cornus Unalaschkensis Ledeb.
- Western Cowbane - Oxypolis Occidentalis J.M. Coult. & Rose
- Western Cypress - Hesperocyparis Bartel & R.A. Price
- Western Daisy - Astranthium Nutt.
- Western Daisy Fleabane - Erigeron Bellidiastrum Nutt.
- Western Daisy Fleabane - Erigeron Bellidiastrum Nutt. var. bellidiastrum
- Western Daisy Fleabane - Erigeron Bellidiastrum Nutt. var. robustus Cronquist
- Western Dock - Rumex Aquaticus L.
- Western Dock - Rumex Aquaticus L. var. fenestratus (Greene) Dorn
- Western Dogwood - Cornus Sericea L. ssp. occidentalis (Torr. & A. Gray) Fosberg
- Western Dwarf Cliffbrake - Pellaea Glabella Mett. ex Kuhn ssp. occidentalis (E.E. Nelson) Windham
- Western Dwarf Mistletoe - Arceuthobium Campylopodum Engelm.
- Western Dwarfdandelion - Krigia Occidentalis Nutt.
- Western False Asphodel - Triantha Occidentalis (S. Watson) Gates
- Western False Asphodel - Triantha Occidentalis (S. Watson) Gates ssp. occidentalis
- Western False Dragonhead - Physostegia Parviflora Nutt. ex A. Gray
- Western False Rue Anemone - Enemion Occidentale (Hook. & Arn.) J.R. Drumm. & Hutch.
- Western Featherbells - Stenanthium Occidentale A. Gray
- Western Fescue - Festuca Occidentalis Hook.
- Western Fineleaf Pondweed - Stuckenia Filiformis (Pers.) Börner ssp. occidentalis (J.W. Robbins) Haynes, D.H. Les
- Western Fox Sedge - Carex Vicaria L.H. Bailey
- Western Fringed Catchfly - Silene Nuda (S. Watson) C.L. Hitchc. & Maguire
- Western Fringed Catchfly - Silene Nuda (S. Watson) C.L. Hitchc. & Maguire ssp. nuda
- Western Fumitory - Fumaria Occidentalis Pugsley
- Western Germander - Teucrium Canadense L. var. occidentale (A. Gray) E.M. McClint. & Epling
- Western Giant Hyssop - Agastache Occidentalis (Piper) A. Heller
- Western Goldentop - Euthamia Occidentalis Nutt.
- Western Grasswort - Lilaeopsis Occidentalis J.M. Coult. & Rose
- Western Greenviolet - Hybanthus Attenuatus (Humb. & Bonpl. ex Schult.) Schulze-Menz
- Western Halfchaff Sedge - Lipocarpha Occidentalis (A. Gray) G. Tucker
- Western Heermann's Buckwheat - Eriogonum Heermannii Durand & Hilg. var. occidentale S. Stokes
- Western Hemlock - Tsuga Heterophylla (Raf.) Sarg.
- Western Honey Mesquite - Prosopis Glandulosa Torr. var. torreyana (L.D. Benson) M.C. Johnst.
- Western Horsenettle - Solanum Dimidiatum Raf.
- Western Hound's Tongue - Cynoglossum Occidentale A. Gray
- Western Indian Paintbrush - Castilleja Occidentalis Torr.
- Western Inflated Sedge - Carex Exsiccata L.H. Bailey
- Western Juniper - Juniperus Grandis R.P. Adams
- Western Juniper - Juniperus Occidentalis Hook.
- Western Kittentails - Synthyris Laciniata (A. Gray) Rydb.
- Western Labrador Tea - Ledum Glandulosum Nutt.
- Western Larch - Larix Occidentalis Nutt.
- Western Leatherwood - Dirca Occidentalis A. Gray
- Western Lily - Lilium Occidentale Purdy
- Western Marbleseed - Onosmodium Bejariense DC. ex A. DC. var. occidentale (Mack.) B.L. Turner
- Western Marsh Cudweed - Gnaphalium Palustre Nutt.
- Western Mayhaw - Crataegus Opaca Hook. & Arn.
- Western Meadow Aster - Symphyotrichum Campestre (Nutt.) G.L. Nesom
- Western Meadow Aster - Symphyotrichum Campestre (Nutt.) G.L. Nesom var. campestre
- Western Meadow-rue - Thalictrum Occidentale A. Gray
- Western Meadow-rue - Thalictrum Occidentale A. Gray var. macounii B. Boivin
- Western Meadow-rue - Thalictrum Occidentale A. Gray var. occidentale
- Western Milkvetch - Astragalus Robbinsii (Oakes) A. Gray var. occidentalis S. Watson
- Western Mojave Buckwheat - Eriogonum Mohavense S. Watson
- Western Moonwort - Botrychium Hesperium (Maxon & R.T. Clausen) W.H. Wagner & Lellinger
- Western Moss Heather - Cassiope Mertensiana (Bong.) G. Don
- Western Moss Heather - Cassiope Mertensiana (Bong.) G. Don var. gracilis (Piper) C.L. Hitchc.
- Western Moss Heather - Cassiope Mertensiana (Bong.) G. Don var. mertensiana
- Western Mountain Ash - Sorbus Sitchensis M. Roem.
- Western Mountain Ash - Sorbus Sitchensis M. Roem. var. grayi (Wenzig) C.L. Hitchc.
- Western Mountain Aster - Symphyotrichum Spathulatum (Lindl.) G.L. Nesom
- Western Mountain Aster - Symphyotrichum Spathulatum (Lindl.) G.L. Nesom var. spathulatum
- Western Mountain Kittentails - Synthyris Missurica (Raf.) Pennell ssp. hirsuta Pennell
- Western Mountain Kittentails - Synthyris Missurica (Raf.) Pennell ssp. stellata (Pennell) Kartesz & Gandhi
- Western Mousetail - Myosurus Nitidus Eastw.
- Western Necklacepod - Sophora Leachiana M. Peck
- Western Needlegrass - Achnatherum Occidentale (Thurb.) Barkworth
- Western Needlegrass - Achnatherum Occidentale (Thurb.) Barkworth ssp. occidentale
- Western Neofuscelia Lichen - Neofuscelia Occidentalis (Essl.) Essl.
- Western Oakfern - Gymnocarpium Dryopteris (L.) Newman
- Western Oat - Avena Occidentalis Durieu
- Western Panicgrass - Dichanthelium Acuminatum (Sw.) Gould & C.A. Clark var. fasciculatum (Torr.) Freckmann
- Western Pansy - Viola Beckwithii Torr. & A. Gray ssp. glabrata M.S. Baker
- Western Pearlwort - Sagina Decumbens (Elliott) Torr. & A. Gray ssp. occidentalis (S. Watson) Crow
- Western Pearly Everlasting - Anaphalis Margaritacea (L.) Benth.
- Western Poison Ivy - Toxicodendron Rydbergii (Small ex Rydb.) Greene
- Western Polemonium - Polemonium Occidentale Greene
- Western Polemonium - Polemonium Occidentale Greene ssp. lacustre Wherry
- Western Polemonium - Polemonium Occidentale Greene ssp. occidentale
- Western Polypody - Polypodium Hesperium Maxon
- Western Ponysfoot - Dichondra Occidentalis House
- Western Poppy - Papaver Californicum A. Gray
- Western Purple Cranesbill - Geranium Atropurpureum A. Heller
- Western Purple Cranesbill - Geranium Atropurpureum A. Heller var. atropurpureum
- Western Purple Cranesbill - Geranium Atropurpureum A. Heller var. cowenii (Rydb.) Dorn
- Western Quillwort - Isoetes Occidentalis L.F. Hend.
- Western Racomitrium Moss - Racomitrium Occidentale (Renauld & Cardot) Renauld & Cardot
- Western Ragwort - Packera Hesperia (Greene) W.A. Weber & Á. Löve
- Western Rattlesnake Plantain - Goodyera Oblongifolia Raf.
- Western Rattlesnakeroot - Prenanthes Alata (Hook.) D. Dietr.
- Western Red Columbine - Aquilegia Elegantula Greene
- Western Redcedar - Thuja Plicata Donn ex D. Don
- Western Rockjasmine - Androsace Occidentalis Pursh
- Western Rosinweed - Calycadenia Dc.
- Western Rough Goldenrod - Solidago Radula Nutt.
- Western Rough Goldenrod - Solidago Radula Nutt. var. laeta (Greene) Fernald
- Western Rough Goldenrod - Solidago Radula Nutt. var. radula
- Western Rough Goldenrod - Solidago Radula Nutt. var. stenolepis Fernald
- Western Rush - Juncus Occidentalis Wiegand
- Western Sandcherry - Prunus Pumila L. var. besseyi (L.H. Bailey) Gleason
- Western Sandparsley - Ammoselinum Giganteum J.M. Coult. & Rose
- Western Sandspurry - Spergularia Canadensis (Pers.) G. Don var. occidentalis R.P. Rossb.
- Western Schistidium Moss - Schistidium Occidentale (E. Lawton) Churchill
- Western Sclerophyton Lichen - Sclerophyton Occidentale Herre
- Western Seapurslane - Sesuvium Sessile Pers.
- Western Sedge - Carex Occidentalis L.H. Bailey
- Western Showy Aster - Eurybia Conspicua (Lindl.) G.L. Nesom
- Western Silver Aster - Symphyotrichum Sericeum (Vent.) G.L. Nesom
- Western Singlespike Sedge - Carex Scirpoidea Michx. ssp. pseudoscirpoidea (Rydb.) Dunlop
- Western Snakeroot - Ageratina Occidentalis (Hook.) R.M. King & H. Rob.
- Western Snow Lichen - Stereocaulon Dactylophyllum Flörke var. occidentale (H. Magn.) Lamb
- Western Snowberry - Symphoricarpos Occidentalis Hook.
- Western Soapberry - Sapindus Saponaria L. var. drummondii (Hook. & Arn.) L.D. Benson
- Western Spleenwort - Asplenium Vespertinum Maxon
- Western Springbeauty - Claytonia Rosea Rydb.
- Western Spruce Dwarf Mistletoe - Arceuthobium Microcarpum (Engelm.) Hawksw. & Wiens
- Western Stingingnettle - Hesperocnide Tenella Torr.
- Western Stoneseed - Lithospermum Ruderale Douglas ex Lehm.
- Western Sunflower - Helianthus Anomalus S.F. Blake
- Western Swamp Saxifrage - Saxifraga Apetala Piper
- Western Sweetroot - Osmorhiza Occidentalis (Nutt. ex Torr. & A. Gray) Torr.
- Western Sweetshrub - Calycanthus Occidentalis Hook. & Arn.
- Western Sweetvetch - Hedysarum Occidentale Greene
- Western Sweetvetch - Hedysarum Occidentale Greene var. canone S.L. Welsh
- Western Sweetvetch - Hedysarum Occidentale Greene var. occidentale
- Western Swordfern - Polystichum Munitum (Kaulf.) C. Presl
- Western Tansymustard - Descurainia Pinnata (Walter) Britton
- Western Tansymustard - Descurainia Pinnata (Walter) Britton ssp. brachycarpa (Richardson) Detling
- Western Tansymustard - Descurainia Pinnata (Walter) Britton ssp. filipes (A. Gray) Detling
- Western Tansymustard - Descurainia Pinnata (Walter) Britton ssp. glabra (Wooton & Standl.) Detling
- Western Tansymustard - Descurainia Pinnata (Walter) Britton ssp. halictorum (Cockerell) Detling
- Western Tansymustard - Descurainia Pinnata (Walter) Britton ssp. intermedia (Rydb.) Detling
- Western Tansymustard - Descurainia Pinnata (Walter) Britton ssp. ochroleuca (Wooton) Detling
- Western Tansymustard - Descurainia Pinnata (Walter) Britton ssp. pinnata
- Western Teaberry - Gaultheria Ovatifolia A. Gray
- Western Thelomma Lichen - Thelomma Occidentale (Herre) Tibell
- Western Touch-me-not - Impatiens Noli-tangere L.
- Western Trailing Ticktrefoil - Desmodium Procumbens (Mill.) Hitchc.
- Western Trailing Ticktrefoil - Desmodium Procumbens (Mill.) Hitchc. var. exiguum (A. Gray) B.G. Schub.
- Western Trailing Ticktrefoil - Desmodium Procumbens (Mill.) Hitchc. var. procumbens
- Western Tube Lichen - Hypogymnia Occidentalis L. Pike
- Western Umbrella-sedge - Fuirena Simplex Vahl
- Western Umbrella-sedge - Fuirena Simplex Vahl var. aristulata (Torr.) Kral
- Western Umbrella-sedge - Fuirena Simplex Vahl var. simplex
- Western Valerian - Valeriana Occidentalis A. Heller
- Western Vervain - Verbena Lasiostachys Link
- Western Wallflower - Erysimum Asperum (Nutt.) DC.
- Western Wart Lichen - Pyrenula Occidentalis (R.C. Harris) R.C. Harris
- Western Water Hemlock - Cicuta Douglasii (DC.) J.M. Coult. & Rose
- Western Waterleaf - Hydrophyllum Occidentale (S. Watson) A. Gray
- Western Watermilfoil - Myriophyllum Hippuroides Nutt. ex Torr. & A. Gray
- Western Waterweed - Elodea Nuttallii (Planch.) H. St. John
- Western Wheatgrass - Pascopyrum Smithii (Rydb.) Á. Löve
- Western White Clematis - Clematis Ligusticifolia Nutt.
- Western White Clematis - Clematis Ligusticifolia Nutt. var. brevifolia Nutt.
- Western White Clematis - Clematis Ligusticifolia Nutt. var. ligusticifolia
- Western White Honeysuckle - Lonicera Albiflora Torr. & A. Gray
- Western White Pine Dwarf Mistletoe - Arceuthobium Monticola Hawksw., Wiens & Nickrent
- Western White Pine - Pinus Monticola Douglas ex D. Don
- Western White Spruce - Picea ×albertiana S. Br.
- Western Whiteflower Beardtongue - Penstemon Pratensis Greene
- Western Wild Petunia - Ruellia Occidentalis (A. Gray) Tharp & F.A. Barkley
- Western Willow Dock - Rumex Hesperius Greene
- Western Yampah - Perideridia Erythrorhiza (Piper) T.I. Chuang & Constance
- Western Yarrow - Achillea Millefolium L. var. occidentalis DC.
- Western Yellowcress - Rorippa Curvisiliqua (Hook.) Besser ex Britton var. occidentalis (Greene) R. Stuckey
- Westminster Dewberry - Rubus Pervarius (L.H. Bailey) L.H. Bailey
- Weston's Buckwheat - Eriogonum Nudum Douglas ex Benth. var. westonii (S. Stokes) J.T. Howell
- Westwater Buckwheat - Eriogonum Scabrellum Reveal
- Westwater Tumblemustard - Thelypodiopsis Elegans (M.E. Jones) Rydb.
- Wet Thicket Dewberry - Rubus Tardatus Blanch.
- Wetforest Cyanea - Cyanea Hamatiflora Rock
- Wetforest Cyanea - Cyanea Hamatiflora Rock ssp. hamatiflora
- Wetherill's Buckwheat - Eriogonum Wetherillii Eastw.
- Wetherill's Cryptantha - Cryptantha Wetherillii (Eastw.) Payson
- Wetherill's Milkvetch - Astragalus Wetherillii M.E. Jones
- Wetslope Buttercup - Ranunculus Verecundus B.L. Rob. ex Piper
- Wetsoil Rockcress - Arabis Crucisetosa Constance & Rollins
- Wharton's Dewberry - Rubus Whartoniae L.H. Bailey
- Wheat Sedge - Carex Atherodes Spreng.
- Wheat - Triticum Araraticum Jakubz.
- Wheat - Triticum Ispahanicum Heslot
- Wheat - Triticum L.
- Wheat - Triticum Militinae Zhuk. & Migush.
- Wheat - Triticum Urartu Thumanian ex Gandilyan
- Wheatgrass - Agropyron Gaertn.
- Wheatgrass - Pascopyrum Á. Löve
- Wheatgrass - Pseudoroegneria (nevski) Á. Löve
- Wheatgrass - Thinopyrum Á. Löve
- Wheatspike Scalystem - Elytraria Bromoides Oerst.
- Wheel Milkweed - Asclepias Uncialis Greene
- Wheel Milkweed - Asclepias Uncialis Greene ssp. uncialis
- Wheeler Bluegrass - Poa Nervosa (Hook.) Vasey
- Wheeler's Blackberry - Rubus Wheeleri (L.H. Bailey) L.H. Bailey
- Wheeler's Bluegrass - Poa Wheeleri Vasey
- Wheeler's Disc Lichen - Buellia Wheeleri R.C. Harris
- Wheeler's Peperomia - Peperomia Wheeleri Britton
- Wheeler's Sandwort - Arenaria Congesta Nutt. var. wheelerensis Maguire
- Wheeler's Skeletonweed - Chaetadelpha Wheeleri A. Gray ex S. Watson
- Wheeler's Sphagnum - Sphagnum Wheeleri Müll. Hal.
- Wheeler's Tarweed - Madia Elegans D. Don ex Lindl. ssp. wheeleri (A. Gray) D.D. Keck
- Wheeler's Thistle - Cirsium Wheeleri (A. Gray) Petr.
- Wheelscale Saltbush - Atriplex Elegans (Moq.) D. Dietr.
- Wheelscale Saltbush - Atriplex Elegans (Moq.) D. Dietr. var. elegans
- Wheelscale Saltbush - Atriplex Elegans (Moq.) D. Dietr. var. fasciculata (S. Watson) M.E. Jones
- Wheelscale Saltbush - Atriplex Elegans (Moq.) D. Dietr. var. thornberi M.E. Jones
- Wherry's Catchfly - Silene Caroliniana Walter ssp. wherryi (Small) R.T. Clausen
- Wherry's Pitcherplant - Sarracenia Rubra Walter ssp. wherryi D.E. Schnell
- Whip Nutrush - Scleria Triglomerata Michx.
- Whip Pussytoes - Antennaria Flagellaris (A. Gray) A. Gray
- Whip-poor-will Flower - Trillium Cernuum L.
- Whiplash Pappusgrass - Pappophorum Vaginatum Buckley
- Whiplash Saxifrage - Saxifraga Flagellaris Willd. ex Sternb.
- Whiplash Saxifrage - Saxifraga Flagellaris Willd. ex Sternb. ssp. flagellaris Willd. ex Sternb. [excluded]
- Whiplash Saxifrage - Saxifraga Flagellaris Willd. ex Sternb. ssp. setigera (Pursh) Tolm.
- Whipple Cholla - Cylindropuntia Whipplei (Engelm. & J.M. Bigelow) F.M. Knuth
- Whipple's Claopodium Moss - Claopodium Whippleanum (Sull.) Renauld & Cardot
- Whipple's Fishhook Cactus - Sclerocactus Whipplei (Engelm. & J.M. Bigelow) Britton & Rose
- Whipple's Monkeyflower - Mimulus Whipplei A.L. Grant
- Whipple's Penstemon - Penstemon Whippleanus A. Gray
- Whipplea - Whipplea Torr.
- Whisk Fern - Psilotum Nudum (L.) P. Beauv.
- Whisk Fern - Psilotum Sw.
- Whisk Fern - Psilotum ×intermedium W.H. Wagner
- Whiskbroom Parsley - Harbouria Trachypleura (A. Gray) J.M. Coult. & Rose
- Whiskerbrush - Leptosiphon Ciliatus (Benth.) Jeps.
- Whiskerbrush - Leptosiphon Ciliatus (Benth.) Jeps. ssp. ciliatus
- Whiskerbrush - Leptosiphon Ciliatus (Benth.) Jeps. ssp. neglectus (Greene) J.M. Porter & L.A. Johnso
- Whiskerbush - Coryphantha Ramillosa Cutak
- Whiskered Brome - Bromus Grossus Desf. ex DC.
- Whisky Currant - Ribes Cereum Douglas var. pedicellare W.H. Brewer & S. Watson
- Whisperingbells - Emmenanthe Benth.
- Whisperingbells - Emmenanthe Penduliflora Benth.
- Whisperingbells - Emmenanthe Penduliflora Benth. var. penduliflora
- Whisperingbells - Emmenanthe Penduliflora Benth. var. rosea Brand
- White Adder's-mouth Orchid - Malaxis Brachypoda (A. Gray) Fernald
- White Alder - Alnus Rhombifolia Nutt.
- White Alling - Bontia Daphnoides L.
- White Alumroot - Heuchera Alba Rydb.
- White Arctic Mountain Heather - Cassiope Tetragona (L.) D. Don
- White Arctic Mountain Heather - Cassiope Tetragona (L.) D. Don var. saximontana (Small) C.L. Hitchc.
- White Arctic Mountain Heather - Cassiope Tetragona (L.) D. Don var. tetragona
- White Arrow Arum - Peltandra Sagittifolia (Michx.) Morong
- White Arrowleaf Aster - Symphyotrichum Urophyllum (Lindl.) G.L. Nesom
- White Ash - Fraxinus Americana L.
- White Avalanche-lily - Erythronium Montanum S. Watson
- White Avens - Geum Canadense Jacq.
- White Avens - Geum Canadense Jacq. var. canadense
- White Ballmustard - Calepina Irregularis (Asso) Thell.
- White Baneberry - Actaea Pachypoda Elliott
- White Beaksedge - Rhynchospora Alba (L.) Vahl
- White Bear Sedge - Carex Albursina Sheldon
- White Bedstraw - Galium Album Mill.
- White Beefwood - Schoepfia Obovata C. Wright
- White Bergamot - Monarda Clinopodia L.
- White Birds-in-a-nest - Macbridea Alba Chapm.
- White Bladderflower - Araujia Sericifera Brot.
- White Bladderpod - Lesquerella Pallida (Torr. & A. Gray) S. Watson
- White Blue Eyed Mary - Collinsia Bartsiifolia Benth.
- White Blue Eyed Mary - Collinsia Bartsiifolia Benth. var. bartsiifolia
- White Blue Eyed Mary - Collinsia Bartsiifolia Benth. var. hirsuta (Kellogg) Pennell
- White Blue Eyed Mary - Collinsia Bartsiifolia Benth. var. stricta Newsom
- White Blue-eyed Grass - Sisyrinchium Albidum Raf.
- White Bluffs Bladderpod - Lesquerella Tuplashensis Rollins, K. Beck & F.E. Kaplow
- White Box - Eucalyptus Hemiphloia F. Muell. ex Benth.
- White Brodiaea - Triteleia Hyacinthina (Lindl.) Greene
- White Bryony - Bryonia Alba L.
- White Bully - Sideroxylon Salicifolium (L.) Lam.
- White Bur Cucumber - Sicyos Albus (H. St. John) Telford
- White Cedar - Tabebuia Heterophylla (DC.) Britton
- White Checkerbloom - Sidalcea Candida A. Gray
- White Checkerbloom - Sidalcea Candida A. Gray var. candida
- White Checkerbloom - Sidalcea Candida A. Gray var. glabrata C.L. Hitchc.
- White Cinnamon - Maytenus Laevigata (Vahl) Griseb. ex Eggers
- White Cinnamon Orchid - Corymborkis Veratrifolia (Reinw.) Blume
- White Cinquefoil - Potentilla Alba L.
- White Clintonia - Clintonia Umbellulata (Michx.) Morong
- White Clouds Milkvetch - Astragalus Vexilliflexus Sheldon var. nubilus Barneby
- White Clover - Trifolium Repens L.
- White Cogwood - Homalium Racemosum Jacq.
- White Colicroot - Aletris Farinosa L.
- White Colorado Columbine - Aquilegia Coerulea James var. ochroleuca Hook.
- White Cottongrass - Eriophorum Scheuchzeri Hoppe
- White Crownbeard - Verbesina Virginica L.
- White Crownbeard - Verbesina Virginica L. var. laciniata (Poir.) A. Gray
- White Crownbeard - Verbesina Virginica L. var. virginica
- White Crownvetch - Securigera Globosa (Lam.) Lassen
- White Cudweed - Pseudognaphalium Leucocephalum (A. Gray) Anderb.
- White Cushion Fleabane - Erigeron Disparipilus Cronquist
- White Cypress-pine - Callitris Glaucophylla Joy Thomps. & L.A.S. Johnson
- White Dammar - Vateria Indica L.
- White Deadnettle - Lamium Album L.
- White Doll's Daisy - Boltonia Asteroides (L.) L'Hér.
- White Doll's Daisy - Boltonia Asteroides (L.) L'Hér. var. asteroides
- White Doll's Daisy - Boltonia Asteroides (L.) L'Hér. var. latisquama (A. Gray) Cronquist
- White Doll's Daisy - Boltonia Asteroides (L.) L'Hér. var. recognita (Fernald & Grisc.) Cronquist
- White Easterbonnets - Antheropeas Lanosum (A. Gray) Rydb.
- White Edge Sedge - Carex Debilis Michx.
- White Edge Sedge - Carex Debilis Michx. var. debilis
- White Edge Sedge - Carex Debilis Michx. var. intercursa Fernald
- White Edge Sedge - Carex Debilis Michx. var. interjecta L.H. Bailey
- White Edge Sedge - Carex Debilis Michx. var. pubera A. Gray
- White Edge Sedge - Carex Debilis Michx. var. rudgei L.H. Bailey
- White Edge Sedge - Carex Debilis Michx. var. strictior L.H. Bailey
- White Egyptian Lotus - Nymphaea Lotus L.
- White Eucalyptus - Eucalyptus Alba Reinw. ex Blume
- White Fairy-lantern - Calochortus Albus Douglas ex Benth.
- White Fairypoppy - Meconella Oregana Nutt.
- White False Gilyflower - Allophyllum Integrifolium (Brand) A.D. Grant & V.E. Grant
- White False Hellebore - Veratrum Album L.
- White False Hellebore - Veratrum Album L. ssp. album
- White False Hellebore - Veratrum Album L. ssp. oxysepalum (Turcz.) Hultén
- White False Tickhead - Eatonella Nivea (D.C. Eaton) A. Gray
- White Fawnlily - Erythronium Albidum Nutt.
- White Fenrose - Kosteletzkya Depressa (L.) O.J. Blanch., Fryxell & D.M. Bates
- White Fiestaflower - Pholistoma Membranaceum (Benth.) Constance
- White Fir - Abies Concolor (Gord. & Glend.) Lindl. ex Hildebr.
- White Fishhook Cactus - Echinomastus Intertextus (Engelm.) Britton & Rose
- White Fishhook Cactus - Echinomastus Intertextus (Engelm.) Britton & Rose var. dasyacanthus (Engelm.) Backeb.
- White Fishhook Cactus - Echinomastus Intertextus (Engelm.) Britton & Rose var. intertextus
- White Flowered Prairie Parsley - Polytaenia Albiflora E.L. Keith
- White Four O'clock - Mirabilis Albida (Walter) Heimerl
- White Frasera - Frasera Montana Mulford
- White Fringed Orchid - Platanthera Blephariglottis (Willd.) Lindl.
- White Fringed Orchid - Platanthera Blephariglottis (Willd.) Lindl. var. blephariglottis
- White Fringed Orchid - Platanthera Blephariglottis (Willd.) Lindl. var. conspicua (Nash) Luer
- White Fringeless Orchid - Platanthera Integrilabia (Correll) Luer
- White Fringetree - Chionanthus Virginicus L.
- White Garland-lily - Hedychium Coronarium J. Koenig
- White Garlic - Allium Neapolitanum Cirillo
- White Giant Hyssop - Agastache Micrantha (A. Gray) Wooton & Standl.
- White Girdlepod - Mitracarpus Breviflorus A. Gray
- White Goldenrod - Solidago Bicolor L.
- White Hawkweed - Hieracium Albiflorum Hook.
- White Heath Aster - Symphyotrichum Ericoides (L.) G.L. Nesom
- White Heath Aster - Symphyotrichum Ericoides (L.) G.L. Nesom var. ericoides
- White Heath Aster - Symphyotrichum Ericoides (L.) G.L. Nesom var. stricticaule (Torr. & A. Gray) G.L. Nesom
- White Henbane - Hyoscyamus Albus L.
- White Hoarypea - Tephrosia Candida DC.
- White Hogwood - Sagraea Umbrosa (Sw.) DC.
- White Indigoberry - Randia Aculeata L.
- White Insideout Flower - Vancouveria Hexandra (Hook.) C. Morren & Decne.
- White Ironbark - Eucalyptus Leucoxylon F. Muell.
- White Jungleflame - Ixora Thwaitesii Hook. f.
- White Kauai Rosemallow - Hibiscus Waimeae A. Heller
- White Kauai Rosemallow - Hibiscus Waimeae A. Heller ssp. hannerae (O. Deg. & I. Deg.) D.M. Bates
- White Kauai Rosemallow - Hibiscus Waimeae A. Heller ssp. waimeae
- White Lady's Slipper - Cypripedium Candidum Muhl. ex Willd.
- White Leadtree - Leucaena Leucocephala (Lam.) de Wit
- White Leadtree - Leucaena Leucocephala (Lam.) de Wit ssp. glabrata (Rose) S. Zárate
- White Leadtree - Leucaena Leucocephala (Lam.) de Wit ssp. leucocephala
- White Lobelia - Lobelia Paludosa Nutt.
- White Locoweed - Oxytropis Sericea Nutt.
- White Locoweed - Oxytropis Sericea Nutt. var. sericea
- White Locoweed - Oxytropis Sericea Nutt. var. speciosa (Torr. & A. Gray) S.L. Welsh
- White Logwood - Xylosma Schaefferioides A. Gray
- White Lupine - Lupinus Albus L.
- White Mallow - Eremalche Exilis (A. Gray) Greene
- White Mangrove - Laguncularia Racemosa (L.) C.F. Gaertn.
- White Mariposa Lily - Calochortus Eurycarpus S. Watson
- White Marsh Marigold - Caltha Leptosepala DC.
- White Marsh Marigold - Caltha Leptosepala DC. ssp. leptosepala
- White Marsh Marigold - Caltha Leptosepala DC. ssp. leptosepala var. leptosepala
- White Meadowbeauty - Rhexia Parviflora Chapm.
- White Meadowfoam - Limnanthes Alba Hartw. ex Benth.
- White Meadowfoam - Limnanthes Alba Hartw. ex Benth. ssp. alba
- White Meadowfoam - Limnanthes Alba Hartw. ex Benth. ssp. versicolor (Greene) C.T. Mason
- White Meadowsweet - Spiraea Alba Du Roi
- White Meadowsweet - Spiraea Alba Du Roi var. alba
- White Meadowsweet - Spiraea Alba Du Roi var. latifolia (Aiton) Dippel
- White Milkwood - Tabernaemontana Alba Mill.
- White Milkwort - Polygala Alba Nutt.
- White Moho - Heliocarpus Popayanensis Kunth
- White Moneywort - Alysicarpus Vaginalis (L.) DC.
- White Mountain Alumroot - Heuchera Wootonii Rydb.
- White Mountain Bladderpod - Lesquerella Pinetorum Wooton & Standl.
- White Mountain Buckwheat - Eriogonum Gracilipes S. Watson
- White Mountain Clover - Trifolium Neurophyllum Greene
- White Mountain False Pennyroyal - Hedeoma Pulcherrima Wooton & Standl.
- White Mountain Horkelia - Horkelia Hispidula Rydb.
- White Mountain Larkspur - Delphinium Novomexicanum Wooton
- White Mountain Lupine - Lupinus Sierrae-blancae Wooton & Standl.
- White Mountain Lupine - Lupinus Sierrae-blancae Wooton & Standl. ssp. aquilinus (Wooton & Standl.) Fleak & D. Du
- White Mountain Lupine - Lupinus Sierrae-blancae Wooton & Standl. ssp. sierrae-blancae
- White Mountain Ragwort - Packera Cynthioides (Greene) W.A. Weber & Á. Löve
- White Mountain Saxifrage - Saxifraga Paniculata Mill.
- White Mountain Saxifrage - Saxifraga Paniculata Mill. ssp. neogaea (Butters) D. Löve
- White Mountain Sedge - Carex Geophila Mack.
- White Mountain-avens - Dryas Integrifolia Vahl ssp. chamissonis (Spreng.) Scoggan
- White Mulberry - Morus Alba L.
- White Mullein - Verbascum Lychnitis L.
- White Mustard - Sinapis Alba L.
- White Oak - Quercus Alba L.
- White Panicle Aster - Symphyotrichum Lanceolatum (Willd.) G.L. Nesom
- White Panicle Aster - Symphyotrichum Lanceolatum (Willd.) G.L. Nesom ssp. hesperium (A. Gray) G.L. Nesom
- White Panicle Aster - Symphyotrichum Lanceolatum (Willd.) G.L. Nesom ssp. hesperium (A. Gray) G.L. Nesom var. hes
- White Panicle Aster - Symphyotrichum Lanceolatum (Willd.) G.L. Nesom ssp. lanceolatum
- White Panicle Aster - Symphyotrichum Lanceolatum (Willd.) G.L. Nesom ssp. lanceolatum var. hirsuticaule (Semple &
- White Panicle Aster - Symphyotrichum Lanceolatum (Willd.) G.L. Nesom ssp. lanceolatum var. interior (Wiegand) G.L
- White Panicle Aster - Symphyotrichum Lanceolatum (Willd.) G.L. Nesom ssp. lanceolatum var. lanceolatum
- White Panicle Aster - Symphyotrichum Lanceolatum (Willd.) G.L. Nesom ssp. lanceolatum var. latifolium (Semple & C
- White Pasqueflower - Pulsatilla Occidentalis (S. Watson) Freyn
- White Passionflower - Passiflora Subpeltata Ortega
- White Pea - Lathyrus Sativus L.
- White Penstemon - Penstemon Albidus Nutt.
- White Phacelia - Phacelia Alba Rydb.
- White Pincushion - Chaenactis Artemisiifolia (Harv. & A. Gray ex A. Gray) A. Gray
- White Pine Skullcap - Scutellaria Sapphirina (Barneby) Olmstead
- White Poplar - Populus Alba L.
- White Prairie Aster - Symphyotrichum Falcatum (Lindl.) G.L. Nesom
- White Prairie Aster - Symphyotrichum Falcatum (Lindl.) G.L. Nesom var. commutatum (Torr. & A. Gray) G.L. Nesom
- White Prairie Aster - Symphyotrichum Falcatum (Lindl.) G.L. Nesom var. falcatum
- White Prairie Clover - Dalea Candida Michx. ex Willd.
- White Prairie Clover - Dalea Candida Michx. ex Willd. var. candida
- White Prairie Clover - Dalea Candida Michx. ex Willd. var. oligophylla (Torr.) Shinners
- White Prairie Rose - Rosa Foliolosa Nutt. ex Torr. & A. Gray
- White Pricklyash - Zanthoxylum Martinicense (Lam.) DC.
- White Princesplume - Stanleya Albescens M.E. Jones
- White Pygmypoppy - Canbya Candida Parry ex A. Gray
- White Ramoon - Trophis Racemosa (L.) Urb.
- White Ramping Fumitory - Fumaria Capreolata L.
- White Ratany - Krameria Grayi Rose & Painter
- White Rattlesnakeroot - Prenanthes Alba L.
- White Rimmed Lichen - Aspicilia Albomarginata de Lesd.
- White River Beardtongue - Penstemon Scariosus Pennell
- White River Beardtongue - Penstemon Scariosus Pennell var. albifluvis (England) N.H. Holmgren
- White River Beardtongue - Penstemon Scariosus Pennell var. scariosus
- White River Coraldrops - Besseya Plantaginea (James) Rydb.
- White River Valley Beardtongue - Penstemon Barnebyi N.H. Holmgren
- White Rocklettuce - Pinaropappus Roseus (Less.) Less.
- White Rocklettuce - Pinaropappus Roseus (Less.) Less. var. foliosus (A. Heller) Shinners
- White Rocklettuce - Pinaropappus Roseus (Less.) Less. var. roseus
- White Rose Of York - Rosa ×alba L. (pro sp.)
- White Rosemallow - Hibiscus Arnottianus A. Gray
- White Rosemallow - Hibiscus Arnottianus A. Gray ssp. arnottianus
- White Rosemallow - Hibiscus Arnottianus A. Gray ssp. immaculatus (Roe) D.M. Bates
- White Rosewood - Chionanthus Domingensis Lam.
- White Rosinweed - Silphium Albiflorum A. Gray
- White Rubber Vine - Landolphia Owariensis P. Beauv.
- White Rushlily - Hastingsia Alba (Durand) S. Watson
- White Sage - Salvia Apiana Jeps.
- White Sage - Salvia Apiana Jeps. var. apiana
- White Sagebrush - Artemisia Ludoviciana Nutt.
- White Sagebrush - Artemisia Ludoviciana Nutt. ssp. albula (Wooton) D.D. Keck
- White Sagebrush - Artemisia Ludoviciana Nutt. ssp. candicans (Rydb.) D.D. Keck
- White Sagebrush - Artemisia Ludoviciana Nutt. ssp. estesii K.L. Chambers
- White Sagebrush - Artemisia Ludoviciana Nutt. ssp. incompta (Nutt.) D.D. Keck
- White Sagebrush - Artemisia Ludoviciana Nutt. ssp. ludoviciana
- White Sagebrush - Artemisia Ludoviciana Nutt. ssp. mexicana (Willd. ex Spreng.) D.D. Keck
- White Sagebrush - Artemisia Ludoviciana Nutt. ssp. redolens (A. Gray) D.D. Keck
- White Sagebrush - Artemisia Ludoviciana Nutt. ssp. sulcata (Rydb.) D.D. Keck
- White Sand Verbena - Abronia Mellifera Douglas ex Hook.
- White Sands Fanmustard - Nerisyrenia Linearifolia (S. Watson) Greene
- White Sapote - Casimiroa Edulis Llave & Lex.
- White Screwstem - Bartonia Verna (Michx.) Raf. ex Barton
- White Shootingstar - Dodecatheon Dentatum Hook.
- White Shootingstar - Dodecatheon Dentatum Hook. ssp. dentatum
- White Shootingstar - Dodecatheon Dentatum Hook. ssp. utahense (N.H. Holmgren) Kartesz
- White Silk Floss Tree - Chorisia Insignis Kunth
- White Snakeroot - Ageratina Altissima (L.) R.M. King & H. Rob.
- White Snakeroot - Ageratina Altissima (L.) R.M. King & H. Rob. var. altissima
- White Snakeroot - Ageratina Altissima (L.) R.M. King & H. Rob. var. angustata (A. Gray) Clewell & Woot
- White Snakeroot - Ageratina Altissima (L.) R.M. King & H. Rob. var. roanensis (Small) Clewell & Wooten
- White Snowplant - Iresine Angustifolia Euph.
- White Spanishbroom - Cytisus Multiflorus (L'Hér.) Sweet
- White Spikerush - Eleocharis Albida Torr.
- White Spirea - Spiraea Betulifolia Pall.
- White Spruce - Picea Glauca (Moench) Voss
- White Star Apple - Chrysophyllum Albidum G. Don
- White Stickpea - Zapoteca H.m. Hern.
- White Stickpea - Zapoteca Portoricensis (Jacq.) H.M. Hern.
- White Stonecrop - Sedum Album L.
- White Stopper - Eugenia Axillaris (Sw.) Willd.
- White Sunbonnets - Chaptalia Albicans (Sw.) Vent. ex Steud.
- White Sunnybell - Schoenolirion Albiflorum (Raf.) R.R. Gates
- White Swallow-wort - Cynanchum Vincetoxicum (L.) Pers.
- White Sweetvetch - Hedysarum Sulphurescens Rydb.
- White Tackstem - Calycoseris Wrightii A. Gray
- White Thatch Palm - Leucothrinax C.lewis & Zona
- White Thistle - Cirsium Hookerianum Nutt.
- White Thoroughwort - Eupatorium Album L.
- White Thoroughwort - Eupatorium Album L. var. album
- White Thoroughwort - Eupatorium Album L. var. subvenosum A. Gray
- White Tridens - Tridens Albescens (Vasey) Wooton & Standl.
- White Trillium - Trillium Grandiflorum (Michx.) Salisb.
- White Turtlehead - Chelone Glabra L.
- White Twinevine - Funastrum Clausum (Jacq.) Schltr.
- White Upright Mignonette - Reseda Alba L.
- White Velvetleaf - Wissadula Periplocifolia (L.) C. Presl ex Thwaites
- White Vervain - Verbena Urticifolia L.
- White Vervain - Verbena Urticifolia L. var. leiocarpa L.M. Perry & Fernald
- White Vervain - Verbena Urticifolia L. var. urticifolia
- White Violet - Viola Renifolia A. Gray
- White Wallrocket - Diplotaxis Erucoides (L.) DC.
- White Wand Beardtongue - Penstemon Tubaeflorus Nutt.
- White Wand Beardtongue - Penstemon Tubaeflorus Nutt. var. achoreus Fernald
- White Wand Beardtongue - Penstemon Tubaeflorus Nutt. var. tubaeflorus
- White Water Crowfoot - Ranunculus Aquatilis L.
- White Waterleaf - Hydrophyllum Fendleri (A. Gray) A. Heller var. albifrons (A. Heller) J.F. Macbr.
- White Wild Indigo - Baptisia Alba (L.) Vent.
- White Wild Indigo - Baptisia Alba (L.) Vent. var. alba
- White Willow - Salix Alba L.
- White Wood Aster - Eurybia Divaricata (L.) G.L. Nesom
- White Wormwood - Artemisia Herba-alba Asso
- White-and-yellow-flower Cornlily - Ixia Polystachya L.
- White-ash - Eucalyptus Fraxinoides H. Deane & Maiden
- White-flower Johnnyberry - Miconia Splendens (Sw.) Griseb.
- White-flowered Black Mangrove - Lumnitzera Racemosa Willd.
- White-mahogany - Eucalyptus Acmenoides Schauer
- Whitebark Pine - Pinus Albicaulis Engelm.
- Whitebark Raspberry - Rubus Leucodermis Douglas ex Torr. & A. Gray
- Whitebark Raspberry - Rubus Leucodermis Douglas ex Torr. & A. Gray var. bernardinus (Greene) Jeps.
- Whitebark Raspberry - Rubus Leucodermis Douglas ex Torr. & A. Gray var. leucodermis
- Whitebark Raspberry - Rubus Leucodermis Douglas ex Torr. & A. Gray var. trinitatis A. Berger
- Whitebark Senna - Senna Bacillaris (L. f.) Irwin & Barneby
- Whitebox - Eucalyptus Hemiphloia F. Muell. ex Benth. var. albens (Benth.) Maiden
- Whitebract Blazingstar - Mentzelia Involucrata S. Watson
- Whitebract Blazingstar - Mentzelia Involucrata S. Watson var. involucrata
- Whitebract Blazingstar - Mentzelia Involucrata S. Watson var. megalantha I.M. Johnst.
- Whitebristle Cottongrass - Eriophorum Altaicum Meinsh.
- Whitebristle Cottongrass - Eriophorum Altaicum Meinsh. var. altaicum Meinsh. [excluded]
- Whitebristle Cottongrass - Eriophorum Altaicum Meinsh. var. neogaeum Raymond
- Whitebrush - Aloysia Gratissima (Gillies & Hook.) Troncoso
- Whitebrush - Aloysia Gratissima (Gillies & Hook.) Troncoso var. gratissima
- Whitebrush - Aloysia Gratissima (Gillies & Hook.) Troncoso var. schulziae (Standl.) L.D. Benson
- Whitebuttons - Anacyclus Clavatus (Desf.) Pers.
- Whitecolumn Foxtail Cactus - Escobaria Tuberculosa (Engelm.) Britton & Rose
- Whitecolumn Foxtail Cactus - Escobaria Tuberculosa var. tuberculosa (Engelm.) Britton & Rose
- Whitecrown - Holozonia Filipes (Hook. & Arn.) Greene
- Whited's Fissurewort - Halimolobos Whitedii (Piper) Rollins
- Whited's Milkvetch - Astragalus Sinuatus Piper
- Whited's Penstemon - Penstemon Eriantherus Pursh var. whitedii (Piper) A. Nelson
- Whitedaisy Tidytips - Layia Glandulosa (Hook.) Hook. & Arn.
- Whiteedge Flatsedge - Cyperus Flavicomus Michx.
- Whiteedge Morning-glory - Ipomoea Nil (L.) Roth
- Whitefelt Indian Paintbrush - Castilleja Lanata A. Gray ssp. hololeuca (Greene) T.I. Chuang & Heckard
- Whitefingers Lichen - Siphula Ceratites (Wahlenb.) Fr.
- Whitefingers Lichen - Siphula Dactyliza Nyl.
- Whitefingers Lichen - Siphula Fr.
- Whiteflower Albizia - Albizia Saponaria (Lour.) Blume ex Miq.
- Whiteflower Beach Morning-glory - Ipomoea Littoralis Blume
- Whiteflower Cinquefoil - Potentilla Albiflora L.O. Williams
- Whiteflower Currant - Ribes Indecorum Eastw.
- Whiteflower Goldenbush - Ericameria Gilmanii (S.F. Blake) G.L. Nesom
- Whiteflower Ipomopsis - Ipomopsis Longiflora (Torr.) V.E. Grant ssp. australis Fletcher & W.L. Wagner
- Whiteflower Kurrajong - Brachychiton Populneum (Schott & Endl.) R. Br.
- Whiteflower Leafcup - Polymnia Canadensis L.
- Whiteflower Navelwort - Omphalodes Linifolia (L.) Moench
- Whiteflower Passionflower - Passiflora Multiflora L.
- Whiteflower Prairie Clover - Dalea Albiflora A. Gray
- Whiteflower Rabbitbrush - Chrysothamnus Albidus (M.E. Jones ex A. Gray) Greene
- Whiteflower Rein Orchid - Piperia Candida R. Morgan & Ackerman
- Whiteflower Tansyaster - Machaeranthera Canescens (Pursh) A. Gray ssp. canescens var. leucanthemifolia (Greene) S.
- Whitefoot Lipfern - Cheilanthes Leucopoda Link
- Whitegrass - Leersia Virginica Willd.
- Whitehair Acacia - Acaciella Leucothrix (Standl.) Britton & Rose
- Whitehair Goldenrod - Solidago Albopilosa E.L. Braun
- Whitehair Leather Flower - Clematis Albicoma Wherry
- Whitehair Manzanita - Arctostaphylos Viridissima (Eastw.) McMinn
- Whitehair Rosette Grass - Dichanthelium Villosissimum (Nash) Freckmann
- Whitehair Rosette Grass - Dichanthelium Villosissimum (Nash) Freckmann var. praecocius (Hitchc. & Chase) Freckmann
- Whitehair Rosette Grass - Dichanthelium Villosissimum (Nash) Freckmann var. villosissimum
- Whitehead Bogbutton - Lachnocaulon Anceps (Walter) Morong
- Whitehead - Enicostema Blume
- Whitehead - Enicostema Verticillatum (L.) Engl. ex Gilg
- Whitehead Mule-ears - Wyethia Helenioides (DC.) Nutt.
- Whitehead Navarretia - Navarretia Leucocephala Benth.
- Whitehead Navarretia - Navarretia Leucocephala Benth. ssp. leucocephala
- Whitehead Spikesedge - Kyllinga Nemoralis (J.R. Forst. & G. Forst.) Dandy ex Hutch. & Dalziel
- Whiteheart - Oxypetalum Cordifolium (Vent.) Schltr.
- Whitejacket - Aniseia Martinicensis (Jacq.) Choisy
- Whitejacket - Aniseia Martinicensis (Jacq.) Choisy var. nitens (Choisy) O'Donell
- Whitelady - Thunbergia Fragrans Roxb.
- Whiteleaf Indian Mallow - Abutilon Hypoleucum A. Gray
- Whiteleaf Leather Flower - Clematis Glaucophylla Small
- Whiteleaf Manzanita - Arctostaphylos Manzanita Parry
- Whiteleaf Manzanita - Arctostaphylos Manzanita Parry ssp. glaucescens P.V. Wells
- Whiteleaf Manzanita - Arctostaphylos Manzanita Parry ssp. manzanita
- Whiteleaf Mountainmint - Pycnanthemum Albescens Torr. & A. Gray
- Whiteleaf Sunflower - Helianthus Glaucophyllus D.M. Sm.
- Whitemargin Beardtongue - Penstemon Albomarginatus M.E. Jones
- Whitemargin Knotweed - Polygonum Polygaloides Wall. ex Meisn. ssp. esotericum (L.C. Wheeler) J.C. Hickman
- Whitemargin Oxytheca - Oxytheca Emarginata H.M. Hall
- Whitemargin Phlox - Phlox Albomarginata M.E. Jones
- Whitemargin Phlox - Phlox Albomarginata M.E. Jones ssp. albomarginata
- Whitemargin Phlox - Phlox Albomarginata M.E. Jones ssp. diapensioides (Rydb.) Wherry
- Whitemargin Pussytoes - Antennaria Marginata Greene
- Whitemargin Sandmat - Chamaesyce Albomarginata (Torr. & A. Gray) Small
- Whitemouth Dayflower - Commelina Erecta L.
- Whitemouth Dayflower - Commelina Erecta L. var. angustifolia (Michx.) Fernald
- Whitemouth Dayflower - Commelina Erecta L. var. deamiana Fernald
- Whitemouth Dayflower - Commelina Erecta L. var. erecta
- Whitenymph - Trepocarpus Aethusae Nutt. ex DC.
- Whiteochloa C.e. Hubb.
- Whiteochloa Cymbiformis (Hughes) B.K. Simon
- Whiteplume Wirelettuce - Stephanomeria Exigua Nutt. ssp. carotifera (Hoover) Gottlieb
- Whiteplume Wirelettuce - Stephanomeria Exigua Nutt. ssp. coronaria (Greene) Gottlieb
- Whiteplume Wirelettuce - Stephanomeria Exigua Nutt. ssp. macrocarpa Gottlieb
- Whitepole Evening Primrose - Oenothera Pallida Lindl. ssp. gypsophila (Eastw.) Munz & W. Klein
- Whiteray Leastdaisy - Chaetopappa Bellidifolia (A. Gray & Engelm.) Shinners
- Whiteray Pygmydaisy - Pentachaeta Bellidiflora Greene
- Whiterim Scurfpea - Pediomelum Subacaule (Torr. & A. Gray) Rydb.
- Whiterim Yucca - Yucca Tenuistyla Trel.
- Whiteroot - Gouania Lupuloides (L.) Urb.
- Whiteroot Rush - Juncus Brachycarpus Engelm.
- Whitescale Sedge - Carex Xerantica L.H. Bailey
- Whitesnow - Drymaria Cordata (L.) Willd. ex Schult.
- Whitesnow - Drymaria Cordata (L.) Willd. ex Schult. ssp. cordata
- Whitesnow - Drymaria Cordata (L.) Willd. ex Schult. ssp. diandra (Blume) J. Duke
- Whitespine Thistle - Cirsium Clokeyi S.F. Blake
- Whitespot Giant Arum - Amorphophallus Paeoniifolius (Dennst.) Nicolson
- Whitespot - Stachys Sylvatica L.
- Whitest Evening Primrose - Oenothera Albicaulis Pursh
- Whitestar - Ipomoea Lacunosa L.
- Whitestar Morning-glory - Ipomoea ×leucantha Jacq. (pro sp.)
- Whitestem Blazingstar - Mentzelia Albicaulis (Hook.) Torr. & A. Gray
- Whitestem Clarkia - Clarkia Gracilis (Piper) A. Nelson & J.F. Macbr. ssp. albicaulis (Jeps.) F.H. Lew
- Whitestem Distaff Thistle - Carthamus Leucocaulos Sm.
- Whitestem Frasera - Frasera Albicaulis Douglas ex Griseb.
- Whitestem Frasera - Frasera Albicaulis Douglas ex Griseb. var. albicaulis
- Whitestem Frasera - Frasera Albicaulis Douglas ex Griseb. var. columbiana (H. St. John) C.L. Hitchc.
- Whitestem Frasera - Frasera Albicaulis Douglas ex Griseb. var. nitida (Benth.) C.L. Hitchc.
- Whitestem Globemallow - Sphaeralcea Munroana (Douglas) Spach ssp. subrhomboidea (Rydb.) Kearney
- Whitestem Goldenbush - Ericameria Discoidea (Nutt.) G.L. Nesom
- Whitestem Goldenbush - Ericameria Discoidea (Nutt.) G.L. Nesom var. discoidea
- Whitestem Goldenbush - Ericameria Discoidea (Nutt.) G.L. Nesom var. linearis (Rydb.) G.L. Nesom
- Whitestem Gooseberry - Ribes Inerme Rydb.
- Whitestem Gooseberry - Ribes Inerme Rydb. var. inerme
- Whitestem Hedgenettle - Stachys Albens A. Gray
- Whitestem Milkweed - Asclepias Albicans S. Watson
- Whitestem Paperflower - Psilostrophe Cooperi (A. Gray) Greene
- Whitestem Pondweed - Potamogeton Praelongus Wulfen
- Whitetassels - Dalea Albida (Torr. & A. Gray) D.B. Ward
- Whitetassels - Dalea Carnea (Michx.) Poir.
- Whitetassels - Dalea Mountjoyae M. Woods
- Whitethorn Acacia - Vachellia Constricta (Benth.) Seigler & Ebinger
- Whitethorn Ceanothus - Ceanothus Cordulatus Kellogg
- Whitethroat - Dasynotus I.m. Johnst.
- Whitetinge Sedge - Carex Albicans Willd. ex Spreng.
- Whitetinge Sedge - Carex Albicans Willd. ex Spreng. var. albicans
- Whitetip Clover - Trifolium Variegatum Nutt.
- Whitetop Aster - Sericocarpus Greene
- Whitetop - Cardaria Desv.
- Whitetop - Cardaria Draba (L.) Desv.
- Whitetop - Doellingeria Nees
- Whitetop-box - Eucalyptus Quadrangulata H. Deane & Maiden
- Whiteveined Wintergreen - Pyrola Picta Sm.
- Whitewash Cornflower - Centaurea Dealbata Willd. [excluded]
- Whiteweed - Ageratum L.
- Whitewhisker Fiddleleaf - Nama Undulatum Kunth
- Whitewhorl Lupine - Lupinus Densiflorus Benth.
- Whitewhorl Lupine - Lupinus Densiflorus Benth. var. aureus (Kellogg) Munz
- Whitewhorl Lupine - Lupinus Densiflorus Benth. var. austrocollium C.P. Sm.
- Whitewhorl Lupine - Lupinus Densiflorus Benth. var. densiflorus
- Whitewhorl Lupine - Lupinus Densiflorus Benth. var. glareosus (Elmer) C.P. Sm.
- Whitewhorl Lupine - Lupinus Densiflorus Benth. var. lacteus (Kellogg) C.P. Sm.
- Whitewhorl Lupine - Lupinus Densiflorus Benth. var. palustris (Kellogg) C.P. Sm.
- Whitewicky - Kalmia Cuneata Michx.
- Whitewood - Coccoloba Krugii Lindau
- Whitewoolly Buckwheat - Eriogonum Ochrocephalum S. Watson
- Whitewoolly Buckwheat - Eriogonum Ochrocephalum S. Watson var. calcareum (S. Stokes) M. Peck
- Whitewoolly Buckwheat - Eriogonum Ochrocephalum S. Watson var. ochrocephalum
- Whitewoolly Buckwheat - Eriogonum Ochrocephalum S. Watson var. sceptrum Reveal
- Whitewoolly Rose - Rosa Tomentosa Sm.
- Whitewoolly Twintip - Stemodia Durantifolia (L.) Sw.
- Whiteworm Lichen - Thamnolia Ach. ex Schaerer
- Whiteworm Lichen - Thamnolia Subuliformis (Ehrh.) W.L. Culb.
- Whiteworm Lichen - Thamnolia Vermicularis (Sw.) Ach. ex Schaerer
- Whitewort - Leucas Martinicensis (Jacq.) W.T. Aiton
- Whiting's Dalea - Psorothamnus Thompsoniae (Vail) S.L. Welsh & N.D. Atwood var. whitingii (Kearney & Peeble
- Whitish Gentian - Gentiana Algida Pall.
- Whitney's Bristleweed - Hazardia Whitneyi (A. Gray) Greene
- Whitney's Bristleweed - Hazardia Whitneyi (A. Gray) Greene var. discoidea (J.T. Howell) W.D. Clark
- Whitney's Bristleweed - Hazardia Whitneyi (A. Gray) Greene var. whitneyi
- Whitney's Clarkia - Clarkia Amoena (Lehm.) A. Nelson & J.F. Macbr. ssp. whitneyi (A. Gray) F.H. Lew
- Whitney's False Oat - Trisetum Inaequale Whitney
- Whitney's Sedge - Carex Whitneyi Olney
- Whitneya Dealbata A. Gray
- Wholeleaf Goldenweed - Pyrrocoma Insecticruris L.F. Hend.
- Wholeleaf Indian Paintbrush - Castilleja Integra A. Gray
- Wholeleaf Indian Paintbrush - Castilleja Integra A. Gray var. gloriosa (Britton) Cockerell
- Wholeleaf Indian Paintbrush - Castilleja Integra A. Gray var. integra
- Wholeleaf Rosinweed - Silphium Integrifolium Michx.
- Wholeleaf Rosinweed - Silphium Integrifolium Michx. var. integrifolium
- Wholeleaf Rosinweed - Silphium Integrifolium Michx. var. laeve Torr. & A. Gray
- Wholeleaf Rosinweed - Silphium Integrifolium Michx. var. neglectum Settle & T.R. Fisher
- Wholeleaf Saxifrage - Saxifraga Integrifolia Hook.
- Whorl-leaf Watermilfoil - Myriophyllum Verticillatum L.
- Whorled Clustervine - Jacquemontia Verticillata (L.) Urb.
- Whorled Lousewort - Pedicularis Verticillata L.
- Whorled Marshpennywort - Hydrocotyle Prolifera Kellogg
- Whorled Marshpennywort - Hydrocotyle Verticillata Thunb.
- Whorled Marshpennywort - Hydrocotyle Verticillata Thunb. var. fetherstoniana (Jennings) Mathias
- Whorled Marshpennywort - Hydrocotyle Verticillata Thunb. var. verticillata
- Whorled Milkweed - Asclepias Verticillata L.
- Whorled Milkwort - Polygala Ambigua Nutt.
- Whorled Milkwort - Polygala Verticillata L.
- Whorled Milkwort - Polygala Verticillata L. var. isocycla Fernald
- Whorled Milkwort - Polygala Verticillata L. var. verticillata
- Whorled Mountainmint - Pycnanthemum Verticillatum (Michx.) Pers.
- Whorled Mountainmint - Pycnanthemum Verticillatum (Michx.) Pers. var. pilosum (Nutt.) Cooperr.
- Whorled Mountainmint - Pycnanthemum Verticillatum (Michx.) Pers. var. verticillatum
- Whorled Oldenlandia - Oldenlandia Verticillata L.
- Whorled Plantain - Plumbago Indica L.
- Whorled Plectranthus - Plectranthus Verticillatus (L. f.) Druce
- Whorled Rosinweed - Silphium Trifoliatum L.
- Whorled Rosinweed - Silphium Trifoliatum L. var. latifolium A. Gray
- Whorled Rosinweed - Silphium Trifoliatum L. var. trifoliatum
- Whorled Sunflower - Helianthus Verticillatus Small
- Whorled Tickseed - Coreopsis Verticillata L.
- Whorled Twintip - Stemodia Verticillata (Mill.) Hassler
- Whorled Wood Aster - Oclemena Acuminata (Michx.) Greene
- Whorled Yellow Loosestrife - Lysimachia Quadrifolia L.
- Whorled-leaf False Buttonweed - Spermacoce Eryngioides (Cham. & Schltdl.) Kuntze
- Whorlgrass - Catabrosa P. Beauv.
- Whortleberry - Vaccinium Myrtillus L.
- Wiborgia Obcordata (P.J. Bergius) Thunb.
- Wiborgia Thunb., nom. cons.
- Wickerstem Buckwheat - Eriogonum Vimineum Douglas ex Benth.
- Wickes' Loeskypnum Moss - Loeskypnum Wickesiae (Grout) Tuom.
- Widecalyx Monkeyflower - Mimulus Platycalyx Pennell
- Wideflower Phlox - Phlox Latifolia Michx.
- Widefruit Sedge - Carex Angustata Boott
- Widehead Groundsel - Packera Eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve
- Widehead Groundsel - Packera Eurycephala (Torr. & A. Gray) W.A. Weber & Á. Löve var. eurycephala
- Wideleaf Arctic Woodrush - Luzula Arctica Blytt ssp. latifolia (Kjellm.) A.E. Porsild
- Wideleaf Bamboo - Sinocalamus Latiflorus (Munro) McClure
- Wideleaf Bamboo - Sinocalamus Mcclure
- Wideleaf Cinclidium Moss - Cinclidium Latifolium Lindb.
- Wideleaf Crumia Moss - Crumia Latifolia (Kindb.) Schof.
- Wideleaf Desmatodon Moss - Desmatodon Latifolius (Hedw.) Brid.
- Wideleaf Dicranum Moss - Dicranum Latifolium Amann
- Wideleaf Gamagrass - Tripsacum Latifolium Hitchc.
- Wideleaf Homomallium Moss - Homomallium Mexicanum Cardot var. latifolium Cardot
- Wideleaf Indian Paintbrush - Castilleja Exserta (A. Heller) T.I. Chuang & Heckard ssp. latifolia (S. Watson) T.I
- Wideleaf Pinelandcress - Warea Amplexifolia (Nutt.) Nutt.
- Wideleaf Polargrass - Arctagrostis Latifolia (R. Br.) Griseb.
- Wideleaf Polargrass - Arctagrostis Latifolia (R. Br.) Griseb. ssp. arundinacea (Trin.) Tzvelev
- Wideleaf Polargrass - Arctagrostis Latifolia (R. Br.) Griseb. ssp. latifolia
- Wideleaf Racomitrium Moss - Racomitrium Canescens (Hedw.) Brid. var. latifolium C.E.O. Jensen
- Wideleaf Schistidium Moss - Schistidium Rivulare (Brid.) Podp. var. latifolium (J.E. Zetterst.) H.A. Crum & L.E.
- Wideleaf Stegonia Moss - Stegonia Latifolia (Schwägr.) Vent. ex Broth.
- Wideleaf Tortula Moss - Tortula Latifolia Bruch ex Hartm.
- Wideleaf Waterparsnip - Sium Latifolium L.
- Widelip Orchid - Liparis Rich.
- Widelip Orchid - Liparis ×jonesii S. Bentley
- Widepetal Lousewort - Pedicularis Bracteosa Benth. var. latifolia (Pennell) Cronquist
- Widespread Rockcap Fern - Pecluma Dispersa (A.M. Evans) M.G. Price
- Widethroat Pink Monkeyflower - Mimulus Platylaemus Pennell
- Widethroat Yellow Monkeyflower - Mimulus Brevipes Benth.
- Widewing Springparsley - Cymopterus Purpurascens (A. Gray) M.E. Jones
- Widgeongrass - Ruppia Maritima L.
- Widgeonweed - Ruppia L.
- Widow's Milkvetch - Astragalus Layneae Greene
- Widow's Sedge - Carex Distenta Kunze
- Widow's-thrill - Kalanchoe Adans.
- Widowscross - Sedum Pulchellum Michx.
- Widowsfrill - Silene Stellata (L.) W.T. Aiton
- Widowstears - Tinantia Anomala (Torr.) C.B. Clarke
- Wiebke's Beggarticks - Bidens Wiebkei Sherff
- Wiegand's Sedge - Carex Wiegandii Mack.
- Wiegand's Wildrye - Elymus Wiegandii Fernald
- Wiegand's Willow - Salix ×wiegandii Fernald
- Wieslander's Manzanita - Arctostaphylos Manzanita Parry ssp. wieslanderi P.V. Wells
- Wig Knapweed - Centaurea Phrygia L.
- Wigandia Caracasana Kunth
- Wigandia Caracasana Kunth var. macrophylla Brand
- Wigandia - Wigandia Kunth
- Wiggins' Cholla - Cylindropuntia Echinocarpa (Engelm. & J.M. Bigelow) F.M. Knuth
- Wiggins' Croton - Croton Wigginsii L.C. Wheeler
- Wiggins' Cryptantha - Cryptantha Wigginsii I.M. Johnst.
- Wiggins' Entosthodon Moss - Entosthodon Wigginsii Steere
- Wiggins' Lily - Lilium Pardalinum Kellogg ssp. wigginsii (Beane & Vollmer) M.W. Skinner
- Wiggins' Swallow-wort - Cynanchum Wigginsii Shinners
- Wigginsia D.m. Porter
- Wigginsia Fricii (Arechav.) D.M. Porter
- Wight's Myriotrema Lichen - Myriotrema Wightii (Taylor) Hale
- Wight's Neonotonia - Neonotonia Wightii (Wight & Arn.) Lackey var. longicauda (Schweinf.) Lackey
- Wight's Neonotonia - Neonotonia Wightii (Wight & Arn.) Lackey var. wightii
- Wijkia Moss - Wijkia H.a. Crum
- Wikstroemia Basicordata Skottsb.
- Wikstroemia Bicornuta Hillebr. ssp. montis-eke Skottsb.
- Wikstroemia Caumii Skottsb.
- Wikstroemia Degeneri Skottsb.
- Wikstroemia Elliptica Merr.
- Wikstroemia Elongata A. Gray
- Wikstroemia Eugenioides Skottsb.
- Wikstroemia Haleakalensis Skottsb.
- Wikstroemia Isae Skottsb.
- Wikstroemia Lanaiensis Skottsb.
- Wikstroemia Lanaiensis Skottsb. var. acutifolia Skottsb.
- Wikstroemia Leptantha Skottsb.
- Wikstroemia Macrosiphon Skottsb.
- Wikstroemia Monticola Skottsb. var. occidentalis Skottsb.
- Wikstroemia Palustris Hochr.
- Wikstroemia Palustris Hochr. var. major Skottsb.
- Wikstroemia Perdita O. Deg. & I. Deg.
- Wikstroemia Phillyreifolia A. Gray var. buxifolia (A. Gray) Skottsb.
- Wikstroemia Phillyreifolia A. Gray var. rigida A. Gray
- Wikstroemia Recurva (Hillebr.) Skottsb.
- Wikstroemia Recurva (Hillebr.) Skottsb. var. neriifolia Skottsb.
- Wikstroemia Sellingii Skottsb.
- Wikstroemia Vacciniifolia Skottsb.
- Wilcox's Barberry - Berberis Wilcoxii Kearney
- Wilcox's Nipple Cactus - Mammillaria Wrightii Engelm. var. wilcoxii (Toumey ex K. Schum.) W.T. Marshall
- Wilcox's Penstemon - Penstemon Wilcoxii Rydb.
- Wilcox's Phlox - Phlox Drummondii Hook. ssp. wilcoxiana (Bogusch) Wherry
- Wilcox's Woollystar - Eriastrum Wilcoxii (A. Nelson) H. Mason
- Wilcoxia Diguetii (F.A.C. Weber) Peebles
- Wilcoxia Poselgeri (Lem.) Britton & Rose
- Wilcoxia Striata (Brandegee) Britton & Rose
- Wild Ackee - Cupania Americana L.
- Wild Balata - Micropholis Guyanensis (A. DC.) Pierre
- Wild Balsam Apple - Echinopepon Wrightii (A. Gray) S. Watson
- Wild Banyantree - Ficus Citrifolia Mill.
- Wild Basil - Clinopodium Vulgare L.
- Wild Bergamot - Monarda Fistulosa L.
- Wild Bergamot - Monarda Fistulosa L. ssp. fistulosa
- Wild Bergamot - Monarda Fistulosa L. ssp. fistulosa var. fistulosa
- Wild Bergamot - Monarda Fistulosa L. ssp. fistulosa var. mollis (L.) Benth.
- Wild Bergamot - Monarda Fistulosa L. ssp. fistulosa var. rubra A. Gray
- Wild Bergamot - Monarda Fistulosa L. var. brevis Fosberg & Artz
- Wild Birdnest Fern - Asplenium Serratum L.
- Wild Bishop - Bifora Radians M. Bieb.
- Wild Blue Phlox - Phlox Divaricata L.
- Wild Blue Phlox - Phlox Divaricata L. ssp. divaricata
- Wild Bushbean - Macroptilium Lathyroides (L.) Urb.
- Wild Bushbean - Macroptilium Lathyroides (L.) Urb. var. lathyroides
- Wild Bushbean - Macroptilium Lathyroides (L.) Urb. var. semierectum (L.) Urb.
- Wild Cabbage - Caulanthus S. Watson
- Wild Canterbury Bells - Phacelia Minor (Harv.) Thell.
- Wild Carrot - Daucus L.
- Wild Cassia - Senna Singueana (Delile) Lock
- Wild Celery - Apium Graveolens L.
- Wild Celery - Apium Graveolens L. var. dulce (Mill.) DC.
- Wild Century Plant - Agave Neglecta Small
- Wild Chervil - Anthriscus Sylvestris (L.) Hoffm.
- Wild Chestnut - Pachira Insignis (Sw.) Sw. ex Savigny
- Wild Chives - Allium Schoenoprasum L.
- Wild Chives - Allium Schoenoprasum L. var. schoenoprasum
- Wild Chives - Allium Schoenoprasum L. var. sibiricum (L.) Hartm.
- Wild Cineraria - Cineraria Saxifraga DC.
- Wild Cinnamon - Canella P. Br.
- Wild Cinnamon - Canella Winterana (L.) Gaertn.
- Wild Clary - Salvia Verbenaca L.
- Wild Coco - Eulophia Alta (L.) Fawc. & Rendle
- Wild Coco - Eulophia R. Br. ex Lindl.
- Wild Coffee - Psychotria Hombroniana (Baill.) Fosberg
- Wild Coffee - Psychotria Hombroniana (Baill.) Fosberg var. canfieldiae Fosberg
- Wild Coffee - Psychotria Hombroniana (Baill.) Fosberg var. hirtella (Valeton) Fosberg
- Wild Coffee - Psychotria Hombroniana (Baill.) Fosberg var. peliliuensis Fosberg
- Wild Coffee - Psychotria L.
- Wild Coffee - Psychotria Mycetoides Valeton
- Wild Coffee-bean - Bauhinia Petersiana Bolle ssp. macrantha (Oliv.) Brummitt & J.H. Ross
- Wild Comfrey - Cynoglossum Virginianum L.
- Wild Comfrey - Cynoglossum Virginianum L. var. boreale (Fernald) Cooperr.
- Wild Comfrey - Cynoglossum Virginianum L. var. virginianum
- Wild Cosmos - Cosmos Caudatus Kunth
- Wild Crab Apple - Peraphyllum Ramosissimum Nutt.
- Wild Crapemyrtle - Malpighia Glabra L.
- Wild Crocus - Tradescantia Longipes E.S. Anderson & Woodson
- Wild Cucumber - Echinocystis Lobata (Michx.) Torr. & A. Gray
- Wild Custard-apple - Annona Senegalensis Pers.
- Wild Date Palm - Phoenix Sylvestris (L.) Roxb.
- Wild Dilly - Manilkara Jaimiqui (C. Wright) Dubard
- Wild Dilly - Manilkara Jaimiqui (C. Wright) Dubard ssp. emarginata (L.) Cronquist
- Wild Dwarf Morning-glory - Evolvulus Arizonicus A. Gray
- Wild Einkorn - Triticum Boeoticum Boiss.
- Wild Einkorn - Triticum Boeoticum Boiss. ssp. boeoticum
- Wild Einkorn - Triticum Boeoticum Boiss. ssp. thaoudar (Reuter ex Hausskn.) Schiem.
- Wild Flag - Iris Setosa Pall. ex Link var. interior E.S. Anderson
- Wild Foxglove - Ceratotheca Triloba (Bernh.) E. Mey. ex Hook. f.
- Wild Garlic - Allium Vineale L.
- Wild Garlic - Allium Vineale L. ssp. vineale
- Wild Garlic - Tulbaghia L.
- Wild Goose Plum - Prunus Munsoniana W. Wight & Hedrick
- Wild Grape - Vitis Vinifera L. ssp. sylvestris (C.C. Gmel.) Hegi
- Wild Guava - Psidium Friedrichsthalianum (O. Berg) Nied.
- Wild Guave - Guettarda Scabra (L.) Vent.
- Wild Hollyhock - Iliamna Greene
- Wild Honeytree - Casearia Decandra Jacq.
- Wild Hydrangea - Hydrangea Arborescens L.
- Wild Indigo - Baptisia Vent.
- Wild Indigo - Baptisia ×bicolor Greenm. & Larisey
- Wild Indigo - Baptisia ×bushii Small (pro sp.)
- Wild Indigo - Baptisia ×fulva Larisey
- Wild Indigo - Baptisia ×microphylla Nutt. (pro sp.)
- Wild Indigo - Baptisia ×serenae M.A. Curtis (pro sp.)
- Wild Indigo - Baptisia ×sulphurea Engelm. (pro sp.)
- Wild Indigo - Baptisia ×variicolor M. Kosnik, G. Diggs, P. Redshaw & B. Lipscomb
- Wild Iris - Dietes Grandiflora N.E. Br.
- Wild Job's Tears - Onosmodium Virginianum (L.) A. DC.
- Wild Jute - Corchorus Tridens L.
- Wild Leadwort - Plumbago Zeylanica L.
- Wild Lime - Adelia L.
- Wild Lime - Adelia Ricinella L.
- Wild Marrow - Croton Astroites Dryand.
- Wild Mint - Mentha Arvensis L.
- Wild Mustard - Sinapis Arvensis L. ssp. arvensis
- Wild Oat - Avena Fatua L.
- Wild Oilnut - Jatropha Hernandiifolia Vent.
- Wild Oilnut - Jatropha Hernandiifolia Vent. var. hernandiifolia
- Wild Oilnut - Jatropha Hernandiifolia Vent. var. portoricensis (Millsp.) Urb.
- Wild Onion - Allium Ascalonicum L.
- Wild Parsnip - Pastinaca Sativa L.
- Wild Pea - Pisum Elatius Steven ex M. Bieb.
- Wild Pea - Vigna Adenantha (G. Mey.) Marechal, Mascherpa & Stanier
- Wild Pennyroyal - Piloblephis Rigida (W. Bartram ex Benth.) Raf.
- Wild Petunia - Ruellia L.
- Wild Plantain - Heliconia Deflexa G.S. Daniels & F.G. Stiles
- Wild Plantain - Heliconia Irrasa R.R. Sm.
- Wild Potato - Solanum Jamesii Torr.
- Wild Privet - Ligustrum Robustum (Roxb.) Blume
- Wild Quinine - Parthenium Auriculatum Britton
- Wild Quinine - Parthenium Hispidum Raf.
- Wild Quinine - Parthenium Integrifolium L.
- Wild Quinine - Parthenium Integrifolium L. var. integrifolium
- Wild Quinine - Parthenium Integrifolium L. var. mabryanum Mears
- Wild Radish - Raphanus Raphanistrum L.
- Wild Sage - Gmelina Philippensis Cham.
- Wild Sandheath - Centaurea Eriophora L.
- Wild Sarsaparilla - Aralia Nudicaulis L.
- Wild Sisal - Furcraea Selloa K. Koch
- Wild Styrax - Styrax Agrestis (Lour.) G. Don
- Wild Sugar Apple - Rollinia Mucosa (Jacq.) Baill.
- Wild Sugarcane - Saccharum Spontaneum L.
- Wild Sweetwilliam - Phlox Maculata L.
- Wild Sweetwilliam - Phlox Maculata L. ssp. maculata
- Wild Sweetwilliam - Phlox Maculata L. ssp. pyramidalis (Sm.) Wherry
- Wild Tamarind - Cojoba Arborea (L.) Britton & Rose
- Wild Tantan - Desmanthus Acuminatus Benth.
- Wild Tantan - Desmanthus Virgatus (L.) Willd.
- Wild Tulip - Tulipa Sylvestris L.
- Wild Yam - Dioscorea Villosa L.
- Wildcane - Gynerium Sagittatum (Aubl.) P. Beauv.
- Wildcane - Gynerium Willd. ex P. Beauv.
- Wildginger - Asarum L.
- Wildhops - Flemingia Strobilifera (L.) W.T. Aiton
- Wildparsley - Musineon Raf.
- Wildrice - Zizania L.
- Wildrye - Elymus Ciliaris (Trin.) Tzvel.
- Wildrye - Elymus Ciliaris (Trin.) Tzvel. ssp. ciliaris
- Wildrye - Elymus Gmelinii (Ledeb.) Tzvel.
- Wildrye - Elymus L.
- Wildrye - Elymus Pendulina (Nevski) Tzvel.
- Wildrye - Elymus Tangutorum (Nevshi) Hand.
- Wildrye - Elymus ×cayouetteorum (B. Boivin) Barkworth
- Wildrye - Elymus ×ebingeri G. Tucker
- Wildrye - Elymus ×maltei Bowden
- Wildrye - Elymus ×mossii (Lepage) Barkworth & D.R. Dewey
- Wildrye - Elymus ×palmerensis (Lepage) Barkworth & D.R. Dewey
- Wildrye - Elymus ×pinaloensis (Pyrah) Barkworth & D.R. Dewey
- Wildrye - Leymus Hochst.
- Wildrye - Leymus Secalinus (Georgi) Tzvel.
- Wildrye - Leymus Secalinus (Georgi) Tzvel. ssp. secalinus
- Wildrye - Leymus ×multiflorus (Gould) Barkworth & Atkins
- Wildrye - Leymus ×uclueletensis (Bowden) Baum
- Wildrye - Leymus ×vancouverensis (Vasey) Pilg. (pro sp.)
- Wildrye - Psathyrostachys Nevski
- Wildrye - ×elyleymus Baum
- Wildrye - ×elyleymus Ungavensis (Louis-Marie) Barkworth
- Wilf's Sphagnum - Sphagnum Wilfii H.A. Crum
- Wilhelmsia - Wilhelmsia Rchb.
- Wili Wili - Erythrina Sandwicensis O. Deg.
- Wilkes' Acalypha - Acalypha Wilkesiana Müll. Arg.
- Wilkesia Grayana Hillebr.
- Wilkins' Bellflower - Campanula Wilkinsiana Greene
- Wilkinson's Nailwort - Paronychia Wilkinsonii S. Watson
- Willamette False Rue Anemone - Enemion Hallii (A. Gray) J.R. Drumm. & Hutch.
- Willamette Fleabane - Erigeron Decumbens Nutt.
- Willamette Fleabane - Erigeron Decumbens Nutt. var. decumbens
- Willamette Fleabane - Erigeron Decumbens Nutt. var. robustior (Cronquist) Cronquist
- Willamette Navarretia - Navarretia Willamettensis S.C. Spencer
- Willamette Valley Bittercress - Cardamine Penduliflora O.E. Schulz
- Willard's Acacia - Mariosousa Willardiana (Rose) Seigler & Ebinger
- Willdenow's Maiden Fern - Thelypteris Interrupta (Willd.) K. Iwats.
- Willdenow's Sedge - Carex Basiantha Steud.
- Willdenow's Sedge - Carex Superata Naczi, Reznicek & B.A. Ford
- Willdenow's Sedge - Carex Willdenowii Schkuhr ex Willd.
- Willdenow's Spikemoss - Selaginella Willdenowii (Desv. ex Poir.) Baker
- Willey's Blemished Lichen - Phlyctis Willeyi Tuck.
- Willey's Cartilage Lichen - Ramalina Willeyi R. Howe
- Willey's Dot Lichen - Arthonia Willeyi Tuck.
- Willey's Mycomicrothelia Lichen - Mycomicrothelia Willeyana (Müll. Arg.) D. Hawksw.
- Willey's Rim Lichen - Lecanora Willeyi Tuck.
- Willey's Seaweed Lichen - Lichina Willeyi (Tuck.) Henssen
- Williams' Buckwheat - Eriogonum Ovalifolium Nutt. var. williamsiae Reveal
- Williams' Hawthorn - Crataegus Williamsii Eggl.
- Williams' Milkvetch - Astragalus Williamsii Rydb.
- Williams' Miterwort - Conimitella Williamsii (D.C. Eaton) Rydb.
- Williams' Sedge - Carex Williamsii Britton
- Williams' Springparsley - Cymopterus Williamsii R.L. Hartm. & Constance
- Willkommia - Willkommia Hack.
- Willmott's Rose - Rosa Willmottiae Hemsl.
- Willoughbya Halei Small
- Willoughbya Heterophylla Small
- Willow Baccharis - Baccharis Salicina Torr. & A. Gray
- Willow Creek Dock - Rumex Tomentellus Rech. f.
- Willow Cyanea - Cyanea Salicina H. Lév.
- Willow Dock - Rumex Salicifolius Weinm.
- Willow Dock - Rumex Salicifolius Weinm. var. angustivalvis Danser
- Willow Dock - Rumex Salicifolius Weinm. var. crassus (Rech. f.) J.T. Howell
- Willow Dock - Rumex Salicifolius Weinm. var. salicifolius
- Willow Dock - Rumex Salicifolius Weinm. var. transitorius (Rech. f.) J.C. Hickman
- Willow Glowweed - Hesperodoria Salicina (S.F. Blake) G.L. Nesom
- Willow Hawthorn - Crataegus Saligna Greene
- Willow Oak - Quercus Phellos L.
- Willow Ragwort - Barkleyanthus (kunth) H. Rob. & Brettell
- Willow Ragwort - Barkleyanthus Salicifolius (Kunth) H. Rob. & Brettell
- Willow - Salix Bicolor Fr.
- Willow - Salix Gilgiana Fr.
- Willow - Salix L.
- Willow Spring Blue-eyed Grass - Sisyrinchium Macrocarpon E.P. Bicknell
- Willow-leaved Climbing Fern - Lygodium Salicifolium C. Presl
- Willowherb - Epilobium L.
- Willowherb - Epilobium Montanum L.
- Willowherb - Epilobium ×pulchrum Suksd. (pro sp.)
- Willowherb - Epilobium ×wisconsinense Ugente
- Willowleaf Angelon - Angelonia Salicariifolia Humb. & Bonpl.
- Willowleaf Aster - Symphyotrichum Praealtum (Poir.) G.L. Nesom
- Willowleaf Aster - Symphyotrichum Praealtum (Poir.) G.L. Nesom var. angustior (Wiegand) G.L. Nesom
- Willowleaf Aster - Symphyotrichum Praealtum (Poir.) G.L. Nesom var. praealtum
- Willowleaf Aster - Symphyotrichum Praealtum (Poir.) G.L. Nesom var. subasperum (Lindl.) G.L. Nesom
- Willowleaf Candyleaf - Stevia Salicifolia Cav.
- Willowleaf Frostweed - Helianthemum Salicifolium (L.) Mill.
- Willowleaf Lettuce - Lactuca Saligna L.
- Willowleaf Meadowsweet - Spiraea Salicifolia L.
- Willowleaf Sandalwood - Santalum Salicifolium Meurisse, nom. inq.
- Willowleaf Spleenwort - Asplenium Salicifolium L.
- Willowleaf Sunflower - Helianthus Salicifolius A. Dietr.
- Willowleaf Yellowhead - Inula Salicina L.
- Willowy Monardella - Monardella Linoides A. Gray ssp. viminea (Greene) Abrams
- Wilman Lovegrass - Eragrostis Superba Peyr.
- Wilson's Bartramidula Moss - Bartramidula Wilsonii Bruch & Schimp.
- Wilson's Bonnet Orchid - Pleurothallis Wilsonii Lindl.
- Wilson's Clubmoss - Huperzia Wilsonii (Underw. & Lloyd) B. Pllg.
- Wilson's Clusterpea - Dioclea Wilsonii Standl.
- Wilson's Maidenhair - Adiantum Wilsonii Hook.
- Wilson's Milkvetch - Astragalus Lentiginosus Douglas ex Hook. var. wilsonii (Greene) Barneby
- Wilson's Pottia Moss - Pottia Wilsonii (Hook.) Bruch & Schimp.
- Wilson's Strigula Lichen - Strigula Wilsonii (Riddle) R.C. Harris
- Wimmera Ryegrass - Lolium Rigidum Gaudin
- Wind River Draba - Draba Ventosa A. Gray
- Wind River Rockcress - Arabis Williamsii Rollins
- Wind River Rockcress - Arabis Williamsii Rollins var. williamsii
- Windham County Blackberry - Rubus Flavinanus Blanch.
- Windham's Scaly Cloakfern - Astrolepis Windhamii Benham
- Winding Mariposa Lily - Calochortus Flexuosus S. Watson
- Windmill Fringed Gentian - Gentianopsis Detonsa (Rottb.) Ma
- Windmill Fringed Gentian - Gentianopsis Detonsa (Rottb.) Ma ssp. detonsa
- Windmill Fringed Gentian - Gentianopsis Detonsa (Rottb.) Ma ssp. nesophila (T. Holm) J.S. Pringle
- Windmill Grass - Chloris Sw.
- Windmill Grass - Chloris ×brevispica Nash
- Windmills - Allionia L.
- Windowbox Woodsorrel - Oxalis Rubra A. St.-Hil.
- Windpoppy - Stylomecon G. Taylor
- Windpoppy - Stylomecon Heterophylla (Benth.) G. Taylor
- Windswept Prairie Dewberry - Rubus Hancinianus L.H. Bailey
- Windyridge Cyrtandra - Cyrtandra Sessilis H. St. John & Storey
- Wine Grape - Vitis Vinifera L.
- Wine Raspberry - Rubus Phoenicolasius Maxim.
- Wine-colored Leather Flower - Clematis Vinacea Floden
- Winecolor Iris - Iris ×vinicolor Small (pro sp.) [excluded]
- Winecup - Callirhoe Digitata Nutt.
- Winecup Clarkia - Clarkia Purpurea (W. Curtis) A. Nelson & J.F. Macbr.
- Winecup Clarkia - Clarkia Purpurea (W. Curtis) A. Nelson & J.F. Macbr. ssp. purpurea
- Winecup Clarkia - Clarkia Purpurea (W. Curtis) A. Nelson & J.F. Macbr. ssp. quadrivulnera (Douglas
- Winecup Clarkia - Clarkia Purpurea (W. Curtis) A. Nelson & J.F. Macbr. ssp. viminea (Douglas ex Hoo
- Wineflower - Boerhavia Anisophylla Torr.
- Wingcup - Schultesia Mart.
- Winged Bean - Psophocarpus Tetragonolobus (L.) DC.
- Winged Bog Orchid - Habenaria Alata Hook.
- Winged Bristle Fern - Trichomanes Alatum Sw.
- Winged Buckwheat - Eriogonum Alatum Torr.
- Winged Buckwheat - Eriogonum Alatum Torr. var. alatum
- Winged Buckwheat - Eriogonum Alatum Torr. var. glabriusculum Torr.
- Winged Buckwheat - Eriogonum Alatum Torr. var. mogollense S. Stokes ex M.E. Jones
- Winged Cryptantha - Cryptantha Holoptera (A. Gray) J.F. Macbr.
- Winged Cudweed - Pseudognaphalium Viscosum (Kunth) W.A. Weber
- Winged Dock - Rumex Spiralis Small
- Winged Elm - Ulmus Alata Michx.
- Winged False Buttonweed - Spermacoce Alata Aubl. [excluded]
- Winged Flax - Linum Alatum (Small) Winkl.
- Winged Four O'clock - Mirabilis Alipes (S. Watson) Pilz
- Winged Lineleaf Fern - Antrophyum Alatum Brack.
- Winged Lythrum - Lythrum Alatum Pursh
- Winged Lythrum - Lythrum Alatum Pursh var. alatum
- Winged Lythrum - Lythrum Alatum Pursh var. lanceolatum (Elliott) Torr. & A. Gray ex Rothr.
- Winged Milkvetch - Astragalus Pterocarpus S. Watson
- Winged Milkwort - Polygala Hemipterocarpa A. Gray
- Winged Panicgrass - Panicum Alatum F. Zuloaga & O. Morrone
- Winged Panicgrass - Panicum Alatum F. Zuloaga & O. Morrone var. alatum
- Winged Panicgrass - Panicum Alatum F. Zuloaga & O. Morrone var. longiflorum F. Zuloaga & O. Morrone
- Winged Panicgrass - Panicum Alatum F. Zuloaga & O. Morrone var. minus (Andersson) F. Zuloaga & O. M
- Winged Pea - Tetragonolobus Purpureus Moench
- Winged Peperomia - Peperomia Alata Ruiz & Pav.
- Winged Pigweed - Cycloloma Atriplicifolium (Spreng.) J.M. Coult.
- Winged Plumeless Thistle - Carduus Tenuiflorus W. Curtis
- Winged Primrose-willow - Ludwigia Alata Elliott
- Winged Rockcress - Sibara Greene
- Winged Sandpuffs - Tripterocalyx Carneus (Greene) L.A. Galloway
- Winged Sandpuffs - Tripterocalyx Carneus (Greene) L.A. Galloway var. carneus
- Winged Sumac - Rhus Copallinum L.
- Winged Sumac - Rhus Copallinum L. var. copallinum
- Winged Sumac - Rhus Copallinum L. var. latifolia Engl.
- Winged Sumac - Rhus Copallinum L. var. leucantha (Jacq.) DC.
- Winged Water-starwort - Callitriche Marginata Torr.
- Winged Wattle - Acacia Alata R. Br.
- Winged-lady Orchid - Oncidium Meirax Rchb. f.
- Wingedseed Draba - Draba Pterosperma Payson
- Wingfruit Suncup - Camissonia Pterosperma (S. Watson) P.H. Raven
- Wingleaf Passionflower - Passiflora Bicornis Mill.
- Wingleaf Primrose-willow - Ludwigia Decurrens Walter
- Wingleaf Soapberry - Sapindus Saponaria L.
- Wingleaf Soapberry - Sapindus Saponaria L. var. saponaria
- Wingnut Cryptantha - Cryptantha Pterocarya (Torr.) Greene
- Wingnut Cryptantha - Cryptantha Pterocarya (Torr.) Greene var. cycloptera (Greene) J.F. Macbr.
- Wingnut Cryptantha - Cryptantha Pterocarya (Torr.) Greene var. pterocarya
- Wingnut Cryptantha - Cryptantha Pterocarya (Torr.) Greene var. stenoloba I.M. Johnst.
- Wingpetal - Heterosperma Pinnatum Cav.
- Wingpod Purslane - Portulaca Umbraticola Kunth
- Wingpod Purslane - Portulaca Umbraticola Kunth ssp. coronata (Small) Matthews & Ketron
- Wingpod Purslane - Portulaca Umbraticola Kunth ssp. umbraticola
- Wingseed Blazingstar - Mentzelia Pterosperma Eastw.
- Wingstem Ayenia - Ayenia Ardua Cristobal
- Wingstem Camphorweed - Pluchea Sagittalis (Lam.) Cabrera
- Wingstem Monkeyflower - Mimulus Alsinoides Douglas ex Benth.
- Wingstem Spurry - Spergula Pentandra L.
- Wingstem - Verbesina Alternifolia (L.) Britton ex Kearney
- Winkler's Blanketflower - Gaillardia Aestivalis (Walter) H. Rock var. winkleri (Cory) B.L. Turner
- Winkler's Pincushion Cactus - Pediocactus Winkleri K.D. Heil
- Winn Falls Fleabane - Erigeron Scopulinus G.L. Nesom & Roth
- Winter Aconite - Eranthis Hyemalis (L.) Salisb.
- Winter Bentgrass - Agrostis Hyemalis (Walter) Britton, Sterns & Poggenb.
- Winter Creeper - Euonymus Fortunei (Turcz.) Hand.-Maz.
- Winter Creeper - Euonymus Fortunei (Turcz.) Hand.-Maz. var. fortunei
- Winter Creeper - Euonymus Fortunei (Turcz.) Hand.-Maz. var. radicans (Siebold ex Miq.) Rehder
- Winter Daffodil - Sternbergia Lutea (L.) Ker Gawl. ex Spreng.
- Winter Daffodil - Sternbergia Waldst. & Kit.
- Winter Grapefern - Botrychium Lunarioides (Michx.) Sw.
- Winter Hazel - Corylopsis Siebold & Zucc.
- Winter Hazel - Corylopsis Sinensis Hemsl.
- Winter Jasmine - Jasminum Nudiflorum Lindl.
- Winter Savory - Satureja Montana L.
- Winter Squash - Cucurbita Maxima Duchesne
- Winter Squash - Cucurbita Maxima Duchesne ssp. andreana (Naudin) Filov
- Winter Vetch - Vicia Villosa Roth
- Winter Vetch - Vicia Villosa Roth ssp. pseudocracca (Bertol.) Ball
- Winter Vetch - Vicia Villosa Roth ssp. varia (Host) Corb.
- Winter Vetch - Vicia Villosa Roth ssp. villosa
- Winter's Bark - Drimys Winteri J.R. Forst. & G. Forst.
- Winter-flowering Cherry - Prunus Subhirtella Miq.
- Winterbeam - Sorbus Airia (L.) Crantz
- Winterberry Euonymus - Euonymus Bungeanus Maxim.
- Winterfat - Krascheninnikovia Arborescens (Losinsk.) Czerep.
- Winterfat - Krascheninnikovia Guldenstaedt
- Winterfat - Krascheninnikovia Lanata (Pursh) A. Meeuse & Smit
- Wintergreen Barberry - Berberis Julianae C.K. Schneid.
- Wintergreen - Pyrola L.
- Wire Bird's-foot Trefoil - Lotus Nuttallianus Greene
- Wire Bluestem - Andropogon Gracilis Spreng.
- Wire Mousetail - Ivesia Webberi A. Gray
- Wire Sedge - Carex Tenax Chapm.
- Wiregrass Gentian - Gentiana Pennelliana Fernald
- Wireleaf Dropseed - Sporobolus Teretifolius Harper
- Wirelettuce - Stephanomeria Nutt.
- Wirestem Buckwheat - Eriogonum Pharnaceoides Torr.
- Wirestem Buckwheat - Eriogonum Pharnaceoides Torr. var. cervinum Reveal
- Wirestem Buckwheat - Eriogonum Pharnaceoides Torr. var. pharnaceoides
- Wirestem Muhly - Muhlenbergia Frondosa (Poir.) Fernald
- Wirevine - Muehlenbeckia Hastatula (Sm.) I.M. Johnst.
- Wireweed - Rigiopappus Leptocladus A. Gray
- Wirtgen's Bedstraw - Galium Verum L. var. wirtgenii (F.W. Schultz) Oborny
- Wirth's Beard Lichen - Usnea Wirthii P. Clerc
- Wiry Blue-eyed Grass - Sisyrinchium Biforme E.P. Bicknell
- Wiry Flatsedge - Cyperus Filiformis Sw.
- Wiry Panicgrass - Panicum Flexile (Gattinger) Scribn.
- Wiry Snapdragon - Sairocarpus Vexillocalyculatus (Kellogg) D.A. Sutton
- Wisconsin Blackberry - Rubus Wisconsinensis L.H. Bailey
- Wisconsin Dewberry - Rubus Regionalis (L.H. Bailey) L.H. Bailey
- Wisconsin Penstemon - Penstemon Gracilis Nutt. var. wisconsinensis (Pennell) Fassett
- Wisconsin Rim Lichen - Lecanora Wisconsinensis H. Magn.
- Wisconsin Weeping Willow - Salix ×pendulina Wender.
- Wishbone Blue-eyed Grass - Sisyrinchium Dichotomum E.P. Bicknell
- Wishbone Fiddleleaf - Nama Dichotomum (Ruiz & Pav.) Choisy
- Wishbone Flower - Torenia Asiatica L.
- Wishbone-bush - Mirabilis Laevis (Benth.) Curran var. retrorsa (A. Heller) Jeps.
- Wishbone-bush - Mirabilis Laevis (Benth.) Curran var. villosa (Kellogg) Spellenb.
- Wisley Barberry - Berberis Wisleyensis Ahrendt
- Wislizenia Californica Greene
- Wislizenia Divaricata Greene
- Wislizenia Refracta Engelm. var. melilotoides (Greene) I.M. Johnst.
- Wislizenia Refracta Engelm. var. palmeri (A. Gray) I.M. Johnst.
- Wislizenia - Wislizenia Engelm.
- Wislizenus' False Threadleaf - Schkuhria Pinnata (Lam.) Kuntze ex Thell. var. guatemalensis (Rydb.) McVaugh
- Wislizenus' Senna - Senna Wislizeni (A. Gray) Irwin & Barneby
- Wissadula Callimorpha (Hochr.) Hassler
- Wissadula Callimorpha (Hochr.) Hassler var. friesii Hassler
- Wissadula Contracta (Link) R.E. Fries [excluded]
- Wissadula Holosericea (Scheele) Garcke
- Wissadula - Wissadula Medik.
- Wisteria Frutescens (L.) Poir. var. macrostachya Torr. & A. Gray
- Wisteria Macrostachya (Torr. & A. Gray) Nutt. ex B.L. Rob. & Fernald
- Wisteria - Wisteria Nutt.
- Wisteria - Wisteria ×formosa Rehder
- Witch's Hair Lichen - Alectoria Ach.
- Witch's Hair Lichen - Alectoria Fallacina Mot.
- Witch's Hair Lichen - Alectoria Lata (Taylor) Lindsay
- Witch's Hair Lichen - Alectoria Nigricans (Ach.) Nyl.
- Witch's Hair Lichen - Alectoria Ochroleuca (Hoffm.) A. Massal.
- Witch's Hair Lichen - Alectoria Sarmentosa (Ach.) Ach.
- Witch's Hair Lichen - Alectoria Sarmentosa (Ach.) Ach. ssp. sarmentosa
- Witch's Hair Lichen - Alectoria Sarmentosa (Ach.) Ach. ssp. vexillifera (Nyl.) D. Hawksw.
- Witch's Moneybags - Hylotelephium Telephium (L.) H. Ohba
- Witch's Moneybags - Hylotelephium Telephium (L.) H. Ohba ssp. fabaria (W.D.J. Koch) H. Ohba
- Witch's Moneybags - Hylotelephium Telephium (L.) H. Ohba ssp. telephium
- Witchalder - Fothergilla L.
- Witchgrass - Panicum Capillare L.
- Witchhazel - Hamamelis L.
- Witchweed - Striga Lour.
- Withania - Withania Pauquy
- Withania - Withania Somnifera (L.) Dunal
- Withe - Cydista Miers
- Withe - Heteropterys Kunth
- Withe-rod - Viburnum Nudum L. var. cassinoides (L.) Torr. & A. Gray
- Withered Bluegrass - Poa Marcida Hitchc.
- Withering Flatsedge - Cyperus Fugax Liebm.
- Wittmackia Lingulata (L.) Mez
- Wittmann's Milkvetch - Astragalus Wittmannii Barneby
- Woad - Isatis L.
- Wolf Lichen - Letharia (th. Fr.) Zahlbr.
- Wolf Lichen - Letharia Columbiana (Nutt.) J.W. Thomson
- Wolf Lichen - Letharia Vulpina (L.) Hue
- Wolf's Bluegrass - Poa Wolfii Scribn.
- Wolf's Currant - Ribes Wolfii Rothr.
- Wolf's Evening Primrose - Oenothera Wolfii (Munz) P.H. Raven, W. Dietr. & Stubbe
- Wolf's Opuntia - Cylindropuntia Wolfii (L.D. Benson) J. Rebman
- Wolf's Saltweed - Atriplex Wolfii S. Watson
- Wolf's Spikerush - Eleocharis Wolfii (A. Gray) A. Gray ex Britton
- Wolf's Trisetum - Trisetum Wolfii Vasey
- Wolf's Willow - Salix Wolfii Bebb
- Wolffia Cylindracea Hegelm.
- Wolffia Floridana (Donn. Sm.) Donn. Sm. ex Hegelm.
- Wolffia Gladiata Hegelm.
- Wolffia Gladiata Hegelm. var. floridana Donn. Sm.
- Wolffia Lingulata Hegelm.
- Wolffia Papulifera C.H. Thomp.
- Wolffia Punctata Griseb.
- Wolffia Punctata auct. non Griseb.
- Wolffiella Floridana (Donn. Sm.) C.H. Thomp.
- Wolffiopsis Welwitschii (Hegelm.) Hartog & Plas
- Wolfsbane - Aconitum Vulparia Rchb. ex Spreng.
- Wolfstail - Lycurus Kunth
- Wollastonia Biflora (L.) DC.
- Wollastonia Biflora (L.) DC. var. biflora
- Wollastonia Biflora (L.) DC. var. canescens (Gaudich.) Fosberg
- Wollastonia Dc. ex Decaisne
- Wollastonia Uniflora (Willd.) Orchard
- Woman's Tobacco - Antennaria Plantaginifolia (L.) Richardson
- Woman's Tongue - Albizia Lebbeck (L.) Benth.
- Wombat Berry - Eustrephus Latifolius R. Br.
- Wonder Flower - Ornithogalum Thyrsoides Jacq.
- Wonder Violet - Viola Mirabilis L.
- Wonderberry - Solanum Burbankii Bitter
- Wonderful Cryptantha - Cryptantha Mirabunda Brand
- Wondering Cowpea - Vigna Speciosa (Kunth) Verdc.
- Wood Anemone - Anemone Quinquefolia L.
- Wood Bluegrass - Poa Nemoralis L.
- Wood Bluegrass - Poa Nemoralis L. ssp. nemoralis
- Wood Lily - Lilium Philadelphicum L.
- Wood Lily - Lilium Philadelphicum L. var. andinum (Nutt.) Ker Gawl.
- Wood Lily - Lilium Philadelphicum L. var. philadelphicum
- Wood Reedgrass - Calamagrostis Perplexa Scribn.
- Wood Saxifrage - Saxifraga Mertensiana Bong.
- Wood Stitchwort - Stellaria Nemorum L.
- Wood Vetch - Vicia Sylvatica L.
- Wood Wakerobin - Trillium Viride Beck
- Wood's Bunchflower - Veratrum Woodii J.W. Robbins ex Alph. Wood
- Wood's Cycad - Encephalartos Woodii Sander
- Wood's Hau Kuahiwi - Hibiscadelphus Woodii D.H. Lorence & W.L. Wagner
- Wood's Pritchardia - Pritchardia Woodii Hodel
- Wood-barley - Hordelymus Europaeus (L.) Harz
- Woodbalm - Lepechinia Calycina (Benth.) Epling ex Munz
- Woodbine - Parthenocissus Vitacea (Knerr) Hitchc.
- Woodborder Dewberry - Rubus Obvius L.H. Bailey
- Woodbury's Babyboot Orchid - Lepanthes Woodburyana Stimson
- Woodbury's Lidflower - Calyptranthes Woodburyi Alain
- Woodbury's Netvine - Marsdenia Woodburyana Acev.-Rodr.
- Woodbury's Nightshade - Solanum Woodburyi Howard
- Woodbury's Stingingbush - Malpighia Woodburyana Vivaldi
- Woodbury's Stopper - Eugenia Woodburyana Alain
- Woodfern - Dryopteris Adans.
- Woodfern - Dryopteris ×australis (Wherry) Small (pro sp.)
- Woodfern - Dryopteris ×benedictii Wherry
- Woodfern - Dryopteris ×boottii (Tuck.) Underw. (pro sp.)
- Woodfern - Dryopteris ×brathaica Fraser-Jenkins & Reichstein
- Woodfern - Dryopteris ×burgessii B. Boivin
- Woodfern - Dryopteris ×correllii W.H. Wagner
- Woodfern - Dryopteris ×dowellii (Farw.) Wherry
- Woodfern - Dryopteris ×leedsii Wherry
- Woodfern - Dryopteris ×mickelii J.H. Peck
- Woodfern - Dryopteris ×neowherryi W.H. Wagner
- Woodfern - Dryopteris ×separabilis Small (pro sp.)
- Woodfern - Dryopteris ×slossoniae Wherry ex Lellinger
- Woodfern - Dryopteris ×triploidea Wherry
- Woodfern - Dryopteris ×uliginosa (A. Braun ex Dowell) Druce
- Woodhouse's Bahia - Picradeniopsis Woodhousei (A. Gray) Rydb.
- Woodhouse's Phlox - Phlox Speciosa Pursh ssp. woodhousei (Torr. ex A. Gray) Wherry
- Woodland Angelica - Angelica Sylvestris L.
- Woodland Arctic Cudweed - Omalotheca Sylvatica (L.) Sch. Bip. & F.W. Schultz
- Woodland Beardtongue - Nothochelone Nemorosa (Douglas ex Lindl.) Straw
- Woodland Beargrass - Nolina Greenei S. Watson ex Trel.
- Woodland Bittercress - Cardamine Flexuosa With.
- Woodland Bluegrass - Poa Sylvestris A. Gray
- Woodland Bog Orchid - Habenaria Eustachya Rchb. f.
- Woodland Bulrush - Scirpus Expansus Fernald
- Woodland Burdock - Arctium Vulgare (Hill) Evans
- Woodland Buttercup - Ranunculus Uncinatus D. Don ex G. Don
- Woodland Buttercup - Ranunculus Uncinatus D. Don ex G. Don var. uncinatus
- Woodland Calamint - Calamintha Sylvatica Bromf.
- Woodland Calamint - Calamintha Sylvatica Bromf. ssp. ascendens (Jord.) P.W. Ball
- Woodland Calamint - Calamintha Sylvatica Bromf. ssp. sylvatica
- Woodland Climbing Bamboo - Arthrostylidium Multispicatum Pilg.
- Woodland Coffee - Bunchosia Polystachia (Andrews) DC.
- Woodland Coffee - Bunchosia Rich. ex Kunth
- Woodland Creepingfern - Bolbitis Pergamentacea (Maxon) Ching
- Woodland Crocus - Crocus Tommasinianus Herb.
- Woodland Dewberry - Rubus Felix L.H. Bailey
- Woodland Draba - Draba Nemorosa L.
- Woodland False Buttonweed - Spermacoce Assurgens Ruiz & Pav.
- Woodland Figwort - Scrophularia Nodosa L.
- Woodland Flax - Linum Virginianum L.
- Woodland Forget-me-not - Myosotis Sylvatica Ehrh.
- Woodland Geranium - Geranium Sylvaticum L.
- Woodland Germander - Teucrium Scorodonia L.
- Woodland Hogwood - Sagraea Domingensis DC.
- Woodland Horsetail - Equisetum Sylvaticum L.
- Woodland Hypolytrum - Hypolytrum Nemorum (Vahl) Spreng.
- Woodland Islandfern - Olfersia Cervina (L.) Kunze
- Woodland Islandmint - Haplostachys Linearifolia (Drake) Sherff
- Woodland Lettuce - Lactuca Floridana (L.) Gaertn.
- Woodland Lettuce - Lactuca Floridana (L.) Gaertn. var. floridana
- Woodland Lettuce - Lactuca Floridana (L.) Gaertn. var. villosa (Jacq.) Cronquist
- Woodland Ma'oloa - Neraudia Sericea Gaudich.
- Woodland Madia - Madia Madioides (Nutt.) Greene
- Woodland Mirrorplant - Coprosma Rhynchocarpa A. Gray
- Woodland Monolopia - Monolopia Gracilens A. Gray
- Woodland Muhly - Muhlenbergia Sylvatica (Torr.) Torr. ex A. Gray
- Woodland Necklace Fern - Lindsaea Lancea (L.) Bedd.
- Woodland Passionflower - Passiflora Morifolia Masters
- Woodland Peperomia - Peperomia Membranacea Hook. & Arn.
- Woodland Pinedrops - Pterospora Andromedea Nutt.
- Woodland Pink - Dianthus Sylvestris Wulfen
- Woodland Pinkroot - Spigelia Marilandica (L.) L.
- Woodland Poppymallow - Callirhoe Papaver (Cav.) A. Gray
- Woodland Pterostegia - Pterostegia Drymarioides Fisch. & C.A. Mey.
- Woodland Ragwort - Senecio Sylvaticus L.
- Woodland Rush - Juncus Subcaudatus (Engelm.) Coville & S.F. Blake
- Woodland Rush - Juncus Subcaudatus (Engelm.) Coville & S.F. Blake var. subcaudatus
- Woodland Sage - Salvia ×sylvestris L. (pro sp.)
- Woodland Sensitive Pea - Chamaecrista Calycioides (DC. ex Collad.) Greene
- Woodland Spurge - Euphorbia Palmeri Engelm. ex S. Watson
- Woodland Spurge - Euphorbia Palmeri Engelm. ex S. Watson var. palmeri
- Woodland Spurge - Euphorbia Palmeri Engelm. ex S. Watson var. subpubens (Engelm.) L.C. Wheeler
- Woodland Stonecrop - Sedum Ternatum Michx.
- Woodland Strawberry - Fragaria Vesca L.
- Woodland Strawberry - Fragaria Vesca L. ssp. americana (Porter) Staudt
- Woodland Strawberry - Fragaria Vesca L. ssp. bracteata (A. Heller) Staudt
- Woodland Strawberry - Fragaria Vesca L. ssp. vesca
- Woodland Sunflower - Helianthus Divaricatus L.
- Woodland Tickseed - Coreopsis Pulchra Boynt.
- Woodland Tidytips - Layia Gaillardioides (Hook. & Arn.) DC.
- Woodland Tribisee - Lasiacis Sorghoidea (Desv. ex Ham.) Hitchc. & Chase
- Woodland Tribisee - Lasiacis Sorghoidea (Desv. ex Ham.) Hitchc. & Chase var. patentiflora (Hitchc. & Cha
- Woodland Tribisee - Lasiacis Sorghoidea (Desv. ex Ham.) Hitchc. & Chase var. sorghoidea
- Woodland Tuftedorchid - Epidendrum Miserrimum Rchb. f.
- Woodland Water-willow - Justicia Carthagenensis Jacq.
- Woodland Wild Coffee - Psychotria Hexandra H. Mann
- Woodland Wild Coffee - Psychotria Hexandra H. Mann ssp. hexandra
- Woodland Wild Coffee - Psychotria Hexandra H. Mann ssp. hexandra var. hexandra
- Woodland Wild Coffee - Psychotria Hexandra H. Mann ssp. hexandra var. hirta Wawra
- Woodland Wild Coffee - Psychotria Hexandra H. Mann ssp. hexandra var. kealiae Fosberg
- Woodland-star - Lithophragma (nutt.) Torr. & A. Gray
- Woodoats - Chasmanthium Link
- Woodreed - Cinna L.
- Woodrose - Merremia Dennst. ex Endl.
- Woodruff - Asperula L.
- Woodruff's Milkvetch - Astragalus Woodruffii M.E. Jones
- Woodrush Flatsedge - Cyperus Entrerianus Boeckeler
- Woodrush - Luzula Dc.
- Woodrush Sedge - Carex Luzulina Olney
- Woodrush Sedge - Carex Luzulina Olney var. ablata (L.H. Bailey) F.J. Herm.
- Woodrush Sedge - Carex Luzulina Olney var. atropurpurea Dorn
- Woodrush Sedge - Carex Luzulina Olney var. luzulina
- Woods Clover - Trifolium Pinetorum Greene
- Woods Valerian - Valeriana Dioica L. var. sylvatica S. Watson
- Woods' Rose - Rosa Woodsii Lindl.
- Woods' Rose - Rosa Woodsii Lindl. var. glabrata (Parish) Cole
- Woods' Rose - Rosa Woodsii Lindl. var. ultramontana (S. Watson) Jeps.
- Woods' Rose - Rosa Woodsii Lindl. var. woodsii
- Woodsia Alpina (Bolton) Gray var. bellii G. Lawson
- Woodsia Cathcartiana B.L. Rob.
- Woodsia Confusa T.M.C. Taylor
- Woodsia Glabella R. Br. ex Richardson var. bellii (G. Lawson) G. Lawson
- Woodsia Ilvensis (L.) R. Br. var. gracilis G. Lawson
- Woodsia Mexicana Fée [excluded]
- Woodsia Oregana D.C. Eaton var. cathcartiana (B.L. Rob.) Morton
- Woodsia Oregana D.C. Eaton var. lyallii (Hook.) B. Boivin
- Woodsia Oregana D.C. Eaton var. squammosa B. Boivin
- Woodsia Scopulina D.C. Eaton ssp. appalachiana (T.M.C. Taylor) Windham
- Woodsia Scopulina D.C. Eaton var. appalachiana (T.M.C. Taylor) Morton
- Woodside Buckwheat - Eriogonum Tumulosum (Barneby) Reveal
- Woodson's Milkvine - Matelea Woodsonii Shinners
- Woodsorrel - Oxalis L.
- Woodvamp - Decumaria Barbara L.
- Woodvine - Sabicea Aubl.
- Woodwardia Chamissoi Brack.
- Woody Crinklemat - Tiquilia Canescens (DC.) A.T. Richardson
- Woody Crinklemat - Tiquilia Canescens (DC.) A.T. Richardson var. canescens
- Woody Crinklemat - Tiquilia Canescens (DC.) A.T. Richardson var. pulchella (I.M. Johnst.) A.T. Richard
- Woody Goldenrod - Chrysoma Pauciflosculosa (Michx.) Greene
- Woody Melicgrass - Melica Frutescens Scribn.
- Woody Milkvetch - Astragalus Miser Douglas ex Hook. var. hylophilus (Rydb.) Barneby
- Woody Rockcress - Arabis Suffrutescens S. Watson
- Woody Rockcress - Arabis Suffrutescens S. Watson var. suffrutescens
- Woodyaster - Xylorhiza Nutt.
- Woodyfruit Evening Primrose - Oenothera Xylocarpa Coville
- Woodypod Milkvetch - Astragalus Sclerocarpus A. Gray
- Woodyroot Milkvetch - Astragalus Riparius Barneby
- Woodystem Speedwell - Veronica Fruticans Jacq.
- Wool Grass - Anthephora Pubescens Nees
- Woolbearing Dandelion - Taraxacum Eriophorum Rydb.
- Woolflower - Celosia Trigyna L.
- Woolgrass - Scirpus Cyperinus (L.) Kunth
- Woolly Amazonvine - Stigmaphyllon Floribundum (DC.) C.E. Anderson
- Woolly Angelica - Angelica Tomentosa S. Watson
- Woolly Beachheather - Hudsonia Tomentosa Nutt.
- Woolly Beachheather - Hudsonia Tomentosa Nutt. var. tomentosa
- Woolly Bellflower - Campanula Lanata Friv.
- Woolly Bird's-foot Trefoil - Lotus Incanus (Torr.) Greene
- Woolly Blackberry - Rubus Tomentosus Borkh.
- Woolly Blackberry - Rubus Tomentosus Borkh. var. canescens Wirtg.
- Woolly Blackberry - Rubus Tomentosus Borkh. var. tomentosus Borkh. [excluded]
- Woolly Bluecurls - Trichostema Lanatum Benth.
- Woolly Bluestar - Amsonia Tomentosa Torr. & Frém.
- Woolly Bluestar - Amsonia Tomentosa Torr. & Frém. var. stenophylla Kearney & Peebles
- Woolly Bluestar - Amsonia Tomentosa Torr. & Frém. var. tomentosa
- Woolly Breeches - Amsinckia Spectabilis Fisch. & C.A. Mey.
- Woolly Brickellbush - Brickellia Incana A. Gray
- Woolly Brome - Bromus Lanatipes (Shear) Rydb.
- Woolly Burdock - Arctium Tomentosum Mill.
- Woolly Butterflybush - Buddleja Marrubiifolia Benth.
- Woolly Catchfly - Silene Thurberi S. Watson
- Woolly Chaffhead - Carphephorus Tomentosus (Michx.) Torr. & A. Gray
- Woolly Cinquefoil - Potentilla Hippiana Lehm.
- Woolly Cinquefoil - Potentilla Hippiana Lehm. var. argyrea (Rydb.) B. Boivin
- Woolly Cinquefoil - Potentilla Hippiana Lehm. var. hippiana
- Woolly Clover - Trifolium Tomentosum L.
- Woolly Cottonflower - Gossypianthus Lanuginosus (Poir.) Moq.
- Woolly Cottonflower - Gossypianthus Lanuginosus (Poir.) Moq. var. lanuginosus
- Woolly Cottonflower - Gossypianthus Lanuginosus (Poir.) Moq. var. tenuiflorus (Hook.) Mears ex Henrickson
- Woolly Desert Marigold - Baileya Pleniradiata Harv. & A. Gray ex A. Gray
- Woolly Desertdandelion - Malacothrix Floccifera (DC.) S.F. Blake
- Woolly Distaff Thistle - Carthamus Lanatus L.
- Woolly Distaff Thistle - Carthamus Lanatus L. ssp. creticus (L.) Holmboe
- Woolly Distaff Thistle - Carthamus Lanatus L. ssp. lanatus
- Woolly Dutchman's Pipe - Aristolochia Tomentosa Sims
- Woolly Easterbonnets - Antheropeas Wallacei (A. Gray) Rydb.
- Woolly Filmy Fern - Hymenophyllum Lanatum Fée
- Woolly Fimbry - Fimbristylis Tomentosa Vahl
- Woolly Fingergrass - Digitaria Eriantha Steud. ssp. pentzii (Stent) Kok
- Woolly Fleabane - Erigeron Lanatus Hook.
- Woolly Fruit Bur Ragweed - Ambrosia Eriocentra (A. Gray) Payne
- Woolly Geranium - Geranium Erianthum DC.
- Woolly Globemallow - Sphaeralcea Lindheimeri A. Gray
- Woolly Goat Chicory - Agoseris Apargioides (Less.) Greene
- Woolly Goat Chicory - Agoseris Apargioides (Less.) Greene var. apargioides
- Woolly Goat Chicory - Agoseris Apargioides (Less.) Greene var. eastwoodiae (Fedde) Munz
- Woolly Goat Chicory - Agoseris Apargioides (Less.) Greene var. maritima (Sheldon) Q. Jones ex Cronquist
- Woolly Goatsbeard - Tragopogon Floccosus Waldst. & Kit.
- Woolly Groundsel - Packera Cana (Hook.) W.A. Weber & Á. Löve
- Woolly Hawkweed - Hieracium Triste Willd. ex Spreng.
- Woolly Hawkweed - Hieracium Triste Willd. ex Spreng. var. fulvum Hultén
- Woolly Hawkweed - Hieracium Triste Willd. ex Spreng. var. triste
- Woolly Hawthorn - Crataegus Lanuginosa Sarg.
- Woolly Hedgenettle - Stachys Byzantina K. Koch
- Woolly Huckleberry - Gaylussacia Mosieri Small
- Woolly Ironweed - Vernonia Lindheimeri A. Gray & Engelm.
- Woolly Lipfern - Cheilanthes Tomentosa Link
- Woolly Locoweed - Astragalus Mollissimus Torr.
- Woolly Locoweed - Astragalus Mollissimus Torr. var. bigelovii (A. Gray) Barneby ex B.L. Turner
- Woolly Locoweed - Astragalus Mollissimus Torr. var. coryi Tidestr.
- Woolly Locoweed - Astragalus Mollissimus Torr. var. earlei (Greene ex Rydb.) Tidestr.
- Woolly Locoweed - Astragalus Mollissimus Torr. var. marcidus (Greene ex Rydb.) Barneby ex B.L. Turner
- Woolly Locoweed - Astragalus Mollissimus Torr. var. matthewsii (S. Watson) Barneby
- Woolly Locoweed - Astragalus Mollissimus Torr. var. mogollonicus (Greene) Barneby
- Woolly Locoweed - Astragalus Mollissimus Torr. var. mollissimus
- Woolly Locoweed - Astragalus Mollissimus Torr. var. thompsoniae (S. Watson) Barneby
- Woolly Lousewort - Pedicularis Lanata Cham. & Schltdl.
- Woolly Maidenhair - Adiantum Villosum L.
- Woolly Marsh Elder - Leuciva Dealbata (A. Gray) Rydb.
- Woolly Meadowfoam - Limnanthes Floccosa Howell
- Woolly Meadowfoam - Limnanthes Floccosa Howell ssp. bellingeriana (M. Peck) Arroyo
- Woolly Meadowfoam - Limnanthes Floccosa Howell ssp. floccosa
- Woolly Meadowfoam - Limnanthes Pumila Howell
- Woolly Meadowfoam - Limnanthes Pumila Howell ssp. grandiflora (Arroyo) S.C. Meyers & K.L. Chambers
- Woolly Meadowfoam - Limnanthes Pumila Howell ssp. pumila
- Woolly Milkweed - Asclepias Vestita Hook. & Arn.
- Woolly Milkweed - Asclepias Vestita Hook. & Arn. ssp. vestita
- Woolly Mock Goldenweed - Stenotus Lanuginosus (A. Gray) Greene
- Woolly Mountainparsley - Oreonana Vestita (S. Watson) Jeps.
- Woolly Mule-ears - Wyethia Mollis A. Gray
- Woolly Nipple Cactus - Mammillaria Nivosa Link ex N.E. Pfeiffer
- Woolly Paperflower - Psilostrophe Tagetina (Nutt.) Greene
- Woolly Paperflower - Psilostrophe Tagetina (Nutt.) Greene var. cerifera (A. Nelson) B.L. Turner
- Woolly Paperflower - Psilostrophe Tagetina (Nutt.) Greene var. tagetina
- Woolly Pawpaw - Asimina Incana (W. Bartram) Exell
- Woolly Plantain - Plantago Patagonica Jacq.
- Woolly Prairie Clover - Dalea Lanata Spreng.
- Woolly Prairie Clover - Dalea Lanata Spreng. var. lanata
- Woolly Prairie Clover - Dalea Lanata Spreng. var. terminalis (M.E. Jones) Barneby
- Woolly Pricklyleaf - Thymophylla Micropoides (DC.) Strother
- Woolly Princesplume - Stanleya Tomentosa Parry
- Woolly Princesplume - Stanleya Tomentosa Parry var. runcinata (Rydb.) Rollins
- Woolly Princesplume - Stanleya Tomentosa Parry var. tomentosa
- Woolly Pussytoes - Antennaria Lanata (Hook.) Greene
- Woolly Ragwort - Packera Tomentosa (Michx.) C. Jeffrey
- Woolly Rosette Grass - Dichanthelium Scabriusculum (Elliott) Gould & C.A. Clark
- Woolly Round-head Clover - Trifolium Eriosphaerum Boiss.
- Woolly Sage - Salvia Funerea M.E. Jones
- Woolly Seablite - Suaeda Taxifolia (Standl.) Standl.
- Woolly Sedge - Carex Pellita Muhl. ex Willd.
- Woolly Senna - Senna Hirsuta (L.) Irwin & Barneby
- Woolly Senna - Senna Hirsuta (L.) Irwin & Barneby var. glaberrima (M.E. Jones) Irwin & Barneb
- Woolly Senna - Senna Hirsuta (L.) Irwin & Barneby var. hirsuta
- Woolly Sunbonnets - Chaptalia Tomentosa Vent.
- Woolly Sunflower - Constancea B.g. Baldw.
- Woolly Sunflower - Eriophyllum Lag.
- Woolly Tidestromia - Tidestromia Lanuginosa (Nutt.) Standl.
- Woolly Uncaria - Uncaria Lanosa Wall.
- Woolly Willow - Salix Calcicola Fernald & Wiegand
- Woolly Woodvine - Sabicea Villosa Willd. ex Roem. & Schult.
- Woolly Yerba Santa - Eriodictyon Tomentosum Benth.
- Woollybutt - Eucalyptus Longifolia Link
- Woollycup Buckwheat - Eriogonum Lachnogynum Torr. ex Benth.
- Woollycup Buckwheat - Eriogonum Lachnogynum Torr. ex Benth. var. lachnogynum
- Woollyfruit Desertparsley - Lomatium Dasycarpum (Torr. & A. Gray) J.M. Coult. & Rose
- Woollyfruit Desertparsley - Lomatium Dasycarpum (Torr. & A. Gray) J.M. Coult. & Rose ssp. dasycarpum
- Woollyfruit Desertparsley - Lomatium Dasycarpum (Torr. & A. Gray) J.M. Coult. & Rose ssp. tomentosum (Benth.) W.
- Woollyfruit Sedge - Carex Lasiocarpa Ehrh.
- Woollygrass - Dasyochloa Willd. ex Rydb.
- Woollygrass - Erioneuron Nash
- Woollyhead Clover - Trifolium Eriocephalum Nutt.
- Woollyhead Clover - Trifolium Eriocephalum Nutt. ssp. arcuatum (Piper) J.M. Gillett
- Woollyhead Clover - Trifolium Eriocephalum Nutt. ssp. eriocephalum
- Woollyhead Lessingia - Lessingia Hololeuca Greene
- Woollyhead Neststraw - Stylocline Micropoides A. Gray
- Woollyhead Parsnip - Sphenosciadium Capitellatum A. Gray
- Woollyhead Prairie Clover - Dalea Laniceps Barneby
- Woollyheads - Psilocarphus Nutt.
- Woollyjoint Pricklypear - Opuntia Tomentosa Salm-Dyck
- Woollyleaf Bur Ragweed - Ambrosia Grayi (A. Nelson) Shinners
- Woollyleaf Manzanita - Arctostaphylos Tomentosa (Pursh) Lindl.
- Woollyleaf Manzanita - Arctostaphylos Tomentosa (Pursh) Lindl. ssp. bracteosa (DC.) J.E. Adams
- Woollyleaf Manzanita - Arctostaphylos Tomentosa (Pursh) Lindl. ssp. crinita (J.E. Adams ex McMinn) Gankin
- Woollyleaf Manzanita - Arctostaphylos Tomentosa (Pursh) Lindl. ssp. eastwoodiana P.V. Wells
- Woollyleaf Manzanita - Arctostaphylos Tomentosa (Pursh) Lindl. ssp. insulicola P.V. Wells
- Woollyleaf Manzanita - Arctostaphylos Tomentosa (Pursh) Lindl. ssp. tomentosa
- Woollypod Milkvetch - Astragalus Purshii Douglas ex Hook.
- Woollypod Milkvetch - Astragalus Purshii Douglas ex Hook. var. concinnus Barneby
- Woollypod Milkvetch - Astragalus Purshii Douglas ex Hook. var. glareosus (Douglas ex Hook.) Barneby
- Woollypod Milkvetch - Astragalus Purshii Douglas ex Hook. var. lagopinus (Rydb.) Barneby
- Woollypod Milkvetch - Astragalus Purshii Douglas ex Hook. var. lectulus (S. Watson) M.E. Jones
- Woollypod Milkvetch - Astragalus Purshii Douglas ex Hook. var. pumilio Barneby
- Woollypod Milkvetch - Astragalus Purshii Douglas ex Hook. var. purshii
- Woollypod Milkvetch - Astragalus Purshii Douglas ex Hook. var. tinctus M.E. Jones
- Woollypod Milkweed - Asclepias Eriocarpa Benth.
- Woollysheath Threeawn - Aristida Lanosa Muhl. ex Elliott
- Woollystar - Eriastrum Wooton & Standl.
- Woolyleaf Ceanothus - Ceanothus Tomentosus Parry
- Woolyspike Balsamscale - Elionurus Barbiculmis Hack.
- Wooton's Hawthorn - Crataegus Wootoniana Eggl.
- Wooton's Holdback - Caesalpinia Wootonii (Britton) Eifert ex Isely
- Wooton's Mock Orange - Philadelphus Wootonii Hu
- Wooton's Pricklypear - Opuntia ×wootonii Griffiths
- Wooton's Ragwort - Senecio Wootonii Greene
- Wooton's Sandpuffs - Tripterocalyx Carneus (Greene) L.A. Galloway var. wootonii (Standl.) L.A. Galloway
- Wooton's Sedge - Carex Wootonii Mack.
- Wooton's Threeawn - Aristida Pansa Wooton & Standl.
- Wootonella Nana (A. Gray) Standl.
- World Map Lichen - Rhizocarpon Geographicum (L.) DC.
- Wormleaf Stonecrop - Sedum Stenopetalum Pursh
- Wormleaf Stonecrop - Sedum Stenopetalum Pursh ssp. monanthum (Suksd.) R.T. Clausen
- Wormleaf Stonecrop - Sedum Stenopetalum Pursh ssp. stenopetalum
- Wormseed - Dysphania Anthelmintica (L.) Mosyakin & Clemants
- Wormseed - Dysphania Aristata (L.) Mosyakin & Clemants
- Wormseed Sandmat - Chamaesyce Vermiculata (Raf.) House
- Wormseed Wallflower - Erysimum Cheiranthoides L.
- Wormskjold's Aplodon Moss - Aplodon Wormskjoldii (Hornem.) Kindb.
- Wormvine Orchid - Vanilla Barbellata Rchb. f.
- Wort Lichen - Verrucaria Sordida Servit
- Wreath Goldenrod - Solidago Caesia L.
- Wreath Lichen - Phaeophyscia Adiastola (Essl.) Essl.
- Wreath Lichen - Phaeophyscia Constipata (Norrlin & Nyl.) Moberg
- Wreath Lichen - Phaeophyscia Endococcina (Körb.) Moberg
- Wreath Lichen - Phaeophyscia Endococcinodes (Poelt) Essl.
- Wreath Lichen - Phaeophyscia Erythrocardia (Tuck.) Essl.
- Wreath Lichen - Phaeophyscia Hirtella Essl.
- Wreath Lichen - Phaeophyscia Insignis (Mereschk.) Moberg
- Wreath Lichen - Phaeophyscia Leana (Tuck.) Essl.
- Wreath Lichen - Phaeophyscia Moberg
- Wreath Lichen - Phaeophyscia Nigricans (Flörke) Moberg
- Wreath Lichen - Phaeophyscia Orbicularis (Neck.) Moberg
- Wreath Lichen - Phaeophyscia Pusilloides (Zahlbr.) Essl.
- Wreath Lichen - Phaeophyscia Rubropulchra (Degel.) Essl.
- Wreath Lichen - Phaeophyscia Sciastra (Ach.) Moberg
- Wretched Sedge - Carex Misera Buckley
- Wright's Alkaligrass - Puccinellia Wrightii (Scribn. & Merr.) Tzvelev
- Wright's Amaranth - Amaranthus Wrightii S. Watson
- Wright's Baccharis - Baccharis Wrightii A. Gray
- Wright's Beaksedge - Rhynchospora Wrightiana Boeckeler
- Wright's Beardgrass - Bothriochloa Wrightii (Hack.) Henr.
- Wright's Beardtongue - Penstemon Wrightii Hook.
- Wright's Bedstraw - Galium Wrightii A. Gray
- Wright's Beebrush - Aloysia Wrightii (A. Gray) A. Heller
- Wright's Bird's Beak - Cordylanthus Wrightii A. Gray
- Wright's Bird's Beak - Cordylanthus Wrightii A. Gray ssp. tenuifolius (Pennell) T.I. Chuang & Heckard
- Wright's Bird's Beak - Cordylanthus Wrightii A. Gray ssp. wrightii
- Wright's Blue Eyed Mary - Collinsia Torreyi A. Gray var. wrightii (S. Watson) I.M. Johnst.
- Wright's Bryum Moss - Bryum Wrightii Sull. & Lesq.
- Wright's Catchfly - Silene Wrightii A. Gray
- Wright's Catkin Mistletoe - Antidaphne Wrightii (Griseb.) Kuijt
- Wright's Cliffbrake - Pellaea Wrightiana Hook.
- Wright's Cudweed - Pseudognaphalium Canescens (DC.) W.A. Weber
- Wright's Cudweed - Pseudognaphalium Canescens (DC.) W.A. Weber ssp. beneolens (Davidson) Kartesz
- Wright's Cudweed - Pseudognaphalium Canescens (DC.) W.A. Weber ssp. canescens
- Wright's Cudweed - Pseudognaphalium Canescens (DC.) W.A. Weber ssp. microcephalum (Nutt.) Kartesz
- Wright's Cudweed - Pseudognaphalium Canescens (DC.) W.A. Weber ssp. thermale (E.E. Nelson) Kartesz
- Wright's Deervetch - Lotus Wrightii (A. Gray) Greene
- Wright's Desert Honeysuckle - Anisacanthus Quadrifidus (Vahl) Nees
- Wright's Desert Honeysuckle - Anisacanthus Quadrifidus (Vahl) Nees var. wrightii (Torr.) Henrickson
- Wright's Dogweed - Adenophyllum Wrightii A. Gray
- Wright's Dutchman's Pipe - Aristolochia Wrightii Seem.
- Wright's Dwarf Gentian - Gentianella Wrightii (A. Gray) Holub
- Wright's Dwarfdandelion - Krigia Wrightii (A. Gray) K.L. Chambers ex Kim
- Wright's Eryngo - Eryngium Heterophyllum Engelm.
- Wright's Fabronia Moss - Fabronia Ciliaris (Brid.) Brid. var. wrightii (Sull.) W.R. Buck
- Wright's False Mallow - Malvastrum Aurantiacum (Scheele) Walp.
- Wright's False Threadleaf - Schkuhria Anthemoidea (DC.) J.M. Coult.
- Wright's False Threadleaf - Schkuhria Anthemoidea (DC.) J.M. Coult. var. anthemoidea (DC.) J.M. Coult. [excluded]
- Wright's False Threadleaf - Schkuhria Anthemoidea (DC.) J.M. Coult. var. wrightii (A. Gray) Heiser
- Wright's Fendlerbush - Fendlera Wrightii (A. Gray) A. Heller
- Wright's Filmy Fern - Hymenophyllum Wrightii Bosch
- Wright's Fishhook Cactus - Sclerocactus Wrightiae L.D. Benson
- Wright's Flatsedge - Cyperus Dipsaceus Liebm.
- Wright's Flowering Fern - Anemia Wrightii Baker
- Wright's Globemallow - Sphaeralcea Wrightii A. Gray
- Wright's Golden Saxifrage - Chrysosplenium Wrightii Franch. & Savigny
- Wright's Golden Saxifrage - Chrysosplenium Wrightii Franch. & Savigny var. beringianum (Rose) H. Hara
- Wright's Golden Saxifrage - Chrysosplenium Wrightii Franch. & Savigny var. wrightii
- Wright's Goldenrod - Solidago Wrightii A. Gray
- Wright's Goldenrod - Solidago Wrightii A. Gray var. adenophora S.F. Blake
- Wright's Goldenrod - Solidago Wrightii A. Gray var. wrightii
- Wright's Indian Mallow - Abutilon Wrightii A. Gray
- Wright's Jaffueliobryum Moss - Jaffueliobryum Wrightii (Sull.) Thér.
- Wright's Laurel Canelon - Ocotea Wrightii (Meisn.) Mez
- Wright's Lipfern - Cheilanthes Wrightii Hook.
- Wright's Meadow-rue - Thalictrum Fendleri Engelm. ex A. Gray var. wrightii (A. Gray) Trel.
- Wright's Micromitrium Moss - Micromitrium Wrightii (Müll. Hal.) Crosby
- Wright's Milkpea - Galactia Wrightii A. Gray
- Wright's Milkpea - Galactia Wrightii A. Gray var. mollissima Kearney & Peebles
- Wright's Milkpea - Galactia Wrightii A. Gray var. wrightii
- Wright's Milkvetch - Astragalus Wrightii A. Gray
- Wright's Mock Buckthorn - Sageretia Wrightii S. Watson
- Wright's Morning-glory - Ipomoea Wrightii A. Gray
- Wright's Nipple Cactus - Mammillaria Wrightii Engelm.
- Wright's Nipple Cactus - Mammillaria Wrightii Engelm. var. wrightii
- Wright's Orange Lichen - Caloplaca Wrightii (Willey) Fink
- Wright's Paspalum - Paspalum Wrightii Hitchc. & Chase
- Wright's Pepperweed - Lepidium Lasiocarpum Nutt. var. wrightii (A. Gray) C.L. Hitchc.
- Wright's Plantain - Plantago Wrightiana Decne.
- Wright's Prairie Clover - Dalea Wrightii A. Gray
- Wright's Pricklyleaf - Thymophylla Tenuiloba (DC.) Small var. wrightii (A. Gray) Strother
- Wright's Rosette Grass - Dichanthelium Wrightianum (Scribn.) Freckmann
- Wright's Saltbush - Atriplex Wrightii S. Watson
- Wright's Sensitive Pea - Chamaecrista Serpens (L.) Greene var. wrightii (A. Gray) Irwin & Barneby
- Wright's Silktassel - Garrya Wrightii Torr.
- Wright's Skullcap - Scutellaria Wrightii A. Gray
- Wright's Snakeroot - Ageratina Wrightii (A. Gray) R.M. King & H. Rob.
- Wright's Snakeweed - Gutierrezia Wrightii A. Gray
- Wright's Spiderwort - Tradescantia Wrightii Rose & Bush
- Wright's Spiderwort - Tradescantia Wrightii Rose & Bush var. glandulopubescens B.L. Turner
- Wright's Spiderwort - Tradescantia Wrightii Rose & Bush var. wrightii
- Wright's Spikemoss - Selaginella Wrightii Hieron.
- Wright's Spikerush - Eleocharis Diandra C. Wright
- Wright's Spotted Felt Lichen - Sticta Wrightii Tuck.
- Wright's Spurge - Euphorbia Wrightii Torr. & A. Gray
- Wright's Star-grass - Hypoxis Wrightii (Baker) Brackett
- Wright's Stonecrop - Sedum Wrightii A. Gray
- Wright's Stonecrop - Sedum Wrightii A. Gray ssp. priscum R.T. Clausen
- Wright's Stonecrop - Sedum Wrightii A. Gray ssp. wrightii
- Wright's Thelypody - Thelypodium Wrightii A. Gray
- Wright's Thelypody - Thelypodium Wrightii A. Gray ssp. wrightii
- Wright's Thimblehead - Hymenothrix Wrightii A. Gray
- Wright's Thistle - Cirsium Wrightii A. Gray
- Wright's Threeawn - Aristida Purpurea Nutt. var. wrightii (Nash) Allred
- Wright's Trumpets - Acleisanthes Wrightii (A. Gray) Benth. & Hook. f. ex Hemsl.
- Wright's Viburnum - Viburnum Wrightii Miq.
- Wright's Waternymph - Najas Wrightiana A. Braun
- Wright's Waterwillow - Justicia Wrightii A. Gray
- Wright's Waxweed - Cuphea Wrightii A. Gray
- Wright's Wirelettuce - Stephanomeria Wrightii A. Gray
- Wright's Yellowshow - Amoreuxia Wrightii A. Gray
- Wrightwort - Carlowrightia A. Gray
- Wrinkled Cryptantha - Cryptantha Rugulosa (Payson) Payson
- Wrinkled Jointtail Grass - Coelorachis Rugosa (Nutt.) Nash
- Wrinkled Rush - Juncus Rugulosus Engelm.
- Wrinkled Spineflower - Chorizanthe Corrugata (Torr.) Torr. & A. Gray
- Wrinkleleaf Goldenrod - Solidago Rugosa Mill.
- Wrinkleleaf Goldenrod - Solidago Rugosa Mill. ssp. aspera (Aiton) Cronquist
- Wrinkleleaf Goldenrod - Solidago Rugosa Mill. ssp. rugosa
- Wrinkleleaf Goldenrod - Solidago Rugosa Mill. ssp. rugosa var. rugosa
- Wrinkleleaf Goldenrod - Solidago Rugosa Mill. ssp. rugosa var. sphagnophila Graves
- Wrinkleleaf Goldenrod - Solidago Rugosa Mill. ssp. rugosa var. villosa (Pursh) Fernald
- Wrinkleseed Pygmyweed - Crassula Saginoides (Maxim.) Bywater & Wickens
- Wrinklewing Springparsley - Cymopterus Corrugatus M.E. Jones
- Wulf's Sphagnum - Sphagnum Wulfianum Girg.
- Wulfen's Lecidella Lichen - Lecidella Wulfenii (Hepp) Körb.
- Wulfen's Pore Lichen - Pertusaria Wulfenioides de Lesd.
- Wulfenia Bullii (Eaton) Barnhart
- Wullschlaegelia - Wullschlaegelia Rchb. f.
- Wyalong Wattle - Acacia Cardiophylla A. Cunn. ex Benth.
- Wych Elm - Ulmus Glabra Huds.
- Wydler's Dancing-lady Orchid - Oncidium Altissimum (Jacq.) Sw.
- Wydler's Ticktrefoil - Desmodium Wydlerianum Urb.
- Wyeth Biscuitroot - Lomatium Ambiguum (Nutt.) J.M. Coult. & Rose
- Wyeth's Lupine - Lupinus Wyethii S. Watson
- Wyeth's Lupine - Lupinus Wyethii S. Watson ssp. wyethii
- Wyethia Angustifolia (DC.) Nutt. var. foliosa (Congd.) H.M. Hall
- Wyethia Bolanderi (A. Gray) W.A. Weber
- Wyethia Elata H.M. Hall
- Wyethia Invenusta (Greene) W.A. Weber
- Wyethia Ovata Torr. & A. Gray ex Torr.
- Wyethia Reticulata Greene
- Wyethia Scabra Hook.
- Wyethia Scabra Hook. var. attenuata W.A. Weber
- Wyethia Scabra Hook. var. canescens W.A. Weber
- Wyethia Scabra Hook. var. scabra
- Wyman Creek Buckwheat - Eriogonum Rupinum Reveal
- Wyoming Besseya - Besseya Wyomingensis (A. Nelson) Rydb.
- Wyoming Big Sagebrush - Artemisia Tridentata Nutt. ssp. wyomingensis Beetle & Young
- Wyoming Flax - Linum Compactum A. Nelson
- Wyoming Indian Paintbrush - Castilleja Linariifolia Benth.
- Wyoming Locoweed - Oxytropis Nana Nutt.
- Wyoming Sand Verbena - Abronia Ammophila Greene
- Wyoming Thistle - Cirsium Pulcherrimum (Rydb.) K. Schum.
- Wyoming Threetip Sagebrush - Artemisia Tripartita Rydb. ssp. rupicola Beetle
- Wyoming Townsend Daisy - Townsendia Alpigena Piper
- Wyoming Townsend Daisy - Townsendia Alpigena Piper var. alpigena
- Wyoming Townsend Daisy - Townsendia Alpigena Piper var. caelilinensis (S.L. Welsh) Kartesz & Gandhi
- Wyoming Townsend Daisy - Townsendia Alpigena Piper var. minima (Eastw.) Dorn
- Wyoming Xanthoparmelia Lichen - Xanthoparmelia Wyomingica (Gyel.) Hale
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