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 | |
| Woodsia neomexicana | New Mexico Cliff Fern | |
| Woodsia obtusa | Bluntlobe Cliff Fern Blunt Cliff Fern | |
| Woodsia obtusa ssp. obtusa | Blunt-lobed Cliff Fern Bluntlobe Cliff Fern | |
| Woodsia obtusa ssp. occidentalis | Western Cliff Fern | |
| Woodsia oregana | Oregon Cliff Fern Oregon Woodsia | |
| Woodsia oregana ssp. cathcartiana | Oregon Cliff Fern | |
| Woodsia oregana ssp. oregana | Oregon Cliff Fern Oregon Woodsia | |
| Woodsia phillipsii | Phillips' Cliff Fern | |
| Woodsia plummerae | Plummer's Cliff Fern Plummer's Woodsia | |
| Woodsia scopulina | Mountain Cliff Fern Rocky Mountain Woodsia Rocky Mountain Cliff Fern | |
| Woodsia scopulina ssp. laurentiana | Laurent's Cliff Fern | |
| Woodsia scopulina ssp. scopulina | Rocky Mountain Cliff Fern Rocky Mountain Woodsia | |
| Woodsia ×abbeae | Cliff Fern | |
| Woodsia ×gracilis | Cliff Fern | |
| Woodsia ×kansana | Cliff Fern | |
| Woodsia ×maxonii | Cliff Fern | |
| Woodsia ×tryonis | Tryon's Woodsia | |
| Woodwardia areolata | Netted Chainfern Chain Fern Netted Chain Fern | |
| Woodwardia fimbriata | Giant Chainfern Giant Chain Fern | |
| Woodwardia virginica | Virginia Chainfern Virginia Chain Fern | |
| Wyethia amplexicaulis | Mule-ears | |
| Wyethia angustifolia | California Compassplant California-compassplant Narrowleaf Mule Ears | |
| Wyethia arizonica | Arizona Mule-ears Arizona Mule's Ears | |
| Wyethia glabra | Coast Range Mule-ears | |
| Wyethia helenioides | Whitehead Mule-ears | |
| Wyethia helianthoides | Sunflower Mule-ears | |
| Wyethia longicaulis | Humboldt Mule-ears | |
| Wyethia mollis | Woolly Mule-ears | |
| Wyethia ×cusickii | Mule-Ears | |
| Wyethia ×magna | Hybrid Mule's-ears | |
| ×Achnella caduca | Mandan Ricegrass | |
| Xanthisma texanum | Texas Sleepy Daisy Yellow Sleepy Daisy Star of Texas Texas Sleepy-daisy Texas Sleepydaisy | |
| Xanthisma texanum var. drummondii | Drummond's Sleepy Daisy Yellow Sleepy Daisy Drummond's Sleepy-daisy Drummond's Sleepydaisy | |
| Xanthisma texanum var. orientale | Texas Sleepy Daisy Texas Sleepy-daisy Texas Sleepydaisy | |
| Xanthisma texanum var. texanum | Texas Sleepydaisy Texas Sleepy-daisy Texas Sleepy Daisy | |
| Xanthium strumarium | Rough Cocklebur | |
| Xanthium strumarium var. canadense | Canada Cocklebur | |
| Xanthium strumarium var. glabratum | Rough Cocklebur | |
| Xanthium strumarium var. strumarium | Rough Cocklebur | |
| Xanthocephalum gymnospermoides | Gummy Broomweed San Pedro Matchweed Gummy Snakeweed | |
| Xanthorhiza simplicissima | Yellowroot Shrub Yellowroot | |
| Xerophyllum asphodeloides | Eastern Turkeybeard Turkeybeard | |
| Xerophyllum tenax | Common Beargrass Western Turkeybeard Bear Lily Pine Lily Elk Grass Squaw Grass Beargrass Turkeybeard | |
| Ximenia americana | Tallow Wood Tallowwood | |
| Ximenia americana var. americana | Tallow Wood Tallow-wood | |
| Xylococcus bicolor | Mission Manzanita | |
| Xylorhiza cognata | Mecca Woodyaster | |
| Xylorhiza confertifolia | Henrieville Woodyaster | |
| Xylorhiza cronquistii | Cronquist's Woodyaster | |
| Xylorhiza glabriuscula | Smooth Woody-aster Smooth Woodyaster | |
| scientific name | common name(s) | image gallery |
