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| scientific name | common name(s) | image gallery |
| Warnockia scutellarioides | Prairie brazoria Prairie brazosmint | |
| Washingtonia filifera | California fan palm Desert palm | |
| Wedelia texana | Zexmenia Orange zexmenia Wedelia Hairy wedelia Texas creeping-oxeye | |
| Whipplea modesta | Common whipplea Modesty Whipplevine Yerba de Selva | |
| Wislizenia refracta | Jackass clover Spectacle fruit | |
| Wissadula amplissima | Big Yellow Velvetleaf | |
| Wissadula periplocifolia | White Velvetleaf | |
| Wisteria frutescens | American wisteria Texas wisteria Kentucky wisteria | |
| Wolffia arrhiza | Spotless watermeal | |
| Wolffia columbiana | Columbian watermeal | |
| Woodsia alpina | Alpine woodsia | |
| Woodsia glabella | Smooth woodsia | |
| Woodsia ilvensis | Rusty cliff fern Rusty woodsia | |
| Woodsia obtusa | Bluntlobe cliff fern | |
| Woodsia oregana ssp. cathcartiana | Oregon cliff fern | |
| Woodwardia areolata | Netted chainfern Chain fern Netted chain fern | |
| Woodwardia fimbriata | Giant chain fern Giant chainfern | |
| Woodwardia virginica | Virginia chainfern Virginia chain fern | |
| Wyethia amplexicaulis | Mule-ears | |
| Wyethia angustifolia | California compassplant California-compassplant Narrowleaf mule ears | |
| Wyethia helianthoides | Sunflower mule-ears | |
| Wyethia mollis | Woolly mule-ears | |
| Wyethia × magna | Hybrid Mule's-ears | |
| Xanthisma texanum | Texas sleepy daisy Sleepy daisy | |
| Xanthisma texanum ssp. drummondii | Drummond's sleepydaisy Sleepy-Daisy | |
| scientific name | common name(s) | image gallery |