Complete list of species
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| scientific name | common name(s) | image gallery |
| Warea amplexifolia | Clasping Warea Wide-leaf Pinelandcress Wide-leaf Warea Wideleaf Pinelandcress | |
| Warea carteri | Carter's Mustard Carter's Pinelandcress | |
| Warea cuneifolia | Carolina Pinelandcress | |
| Warea sessilifolia | Sessile-leaf Pinelandcress Sessile-leaved Warea Sessileleaf Pinelandcress | |
| Warnockia scutellarioides | Prairie Brazosmint Prairie Brazoria | |
| Washingtonia filifera | California Fan Palm Desert Palm Petticoat Palm | |
| Websteria confervoides | Algal Bulrush | |
| Wedelia acapulcensis | Wedelia Zexmenia | |
| Wedelia acapulcensis var. hispida | Zexmenia Orange Zexmenia Hairy Wedelia Wedelia Texas Creeping-oxeye | |
| Whipplea modesta | Common Whipplea Modesty Whipplevine Yerba De Selva | |
| Wikstroemia bicornuta | Alpine False Ohelo | |
| Wikstroemia forbesii | Molokai False Ohelo | |
| Wikstroemia furcata | Forest False Ohelo | |
| Wikstroemia hanalei | Lavafield False Ohelo | |
| Wikstroemia monticola | Montane False Ohelo | |
| Wikstroemia oahuensis | Oahu False Ohelo | |
| Wikstroemia oahuensis var. oahuensis | Oahu False Ohelo | |
| Wikstroemia oahuensis var. palustris | Oahu False Ohelo | |
| Wikstroemia phillyreifolia | Hawaii False Ohelo | |
| Wikstroemia pulcherrima | Kohala False Ohelo | |
| Wikstroemia sandwicensis | Variableleaf False Ohelo | |
| Wikstroemia skottsbergiana | Skottsberg's False Ohelo | |
| Wikstroemia uva-ursi | Fish Poison Plant Hillside False Ohelo | |
| Wikstroemia uva-ursi var. kauaiensis | Kauai False Ohelo | |
| Wikstroemia uva-ursi var. uva-ursi | Hillside False Ohelo | |
| Wikstroemia villosa | Hairy False Ohelo | |
| Wilhelmsia physodes | Arctic-flower Merckia | |
| Wilkesia gymnoxiphium | Iliau | |
| Wilkesia hobdyi | Dwarf Iliau | |
| Willkommia texana | Texas Willkommia | |
| Wislizenia refracta | Spectacle Fruit Jackass Clover | |
| Wislizenia refracta ssp. californica | California Jackass Clover Spectacle Fruit | |
| Wislizenia refracta ssp. palmeri | Palmer's Jackass Clover Palmer's Wislizenia | |
| Wislizenia refracta ssp. refracta | Jackass Clover Spectacle Fruit Spectacle-pod | |
| Wissadula amplissima | Big Yellow Velvetleaf | |
| Wissadula periplocifolia | White Velvetleaf | |
| Wisteria frutescens | American Wisteria Texas Wisteria Kentucky Wisteria | |
| Wolffia arrhiza | Spotless Watermeal | |
| Wolffia borealis | Northern Watermeal | |
| Wolffia brasiliensis | Brazilian Watermeal South American Water Meal Water-meal | |
| Wolffia columbiana | Columbian Watermeal | |
| Wolffia globosa | Asian Watermeal Water Meal | |
| Wolffiella gladiata | Bog Mat Florida Mudmidget Sword Bogmat | |
| Wolffiella lingulata | Mud Midget Tongue-shape Bogmat Tongueshape Bog Mat Tongueshape Bogmat | |
| Wolffiella oblonga | Mud Midget Saber Bog Mat Saber Bogmat | |
| Woodsia alpina | Alpine Woodsia | |
| Woodsia appalachiana | Appalachian Cliff Fern | |
| Woodsia cochisensis | Cochise Cliff Fern | |
| Woodsia glabella | Smooth Woodsia | |
| Woodsia ilvensis | Rusty Woodsia Rusty Cliff Fern | |
| scientific name | common name(s) | image gallery |
