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| scientific name | common name(s) | image gallery |
| Viola trinervata | Desert pansy Rainier violet Sagebrush violet | |
| Viola vallicola var. vallicola | Sagebrush violet Yellow violet | |
| Viola villosa | Carolina violet | |
| Viola walteri | Walter’s violet Prostrate blue violet | |
| Viola × eclipes | Eclipse Violet | |
| Viola × malteana | Malteana Violet | |
| Viola × napae | Napa Violet | |
| Viola ×lovelliana | Lovell violet Lovell's violet | |
| Viola ×palmata | Early blue violet Trilobed violet | |
| Viola ×primulifolia | Primrose-leaved violet | |
| Vitis acerifolia | Mapleleaf grape Panhandle grape Bush grape | |
| Vitis arizonica | Canyon grape Arizona grape | |
| Vitis californica | California grape California wild grape Western wild grape | |
| Vitis cinerea var. helleri | Winter grape Heller's grape Gray-leaf grape Smooth-leaf grape Sweet grape Spanish grape | |
| Vitis girdiana | Desert wild grape Valley grape Southern California grape | |
| Vitis labrusca | Fox grape | |
| Vitis monticola | Sweet mountain grape Champin Grape | |
| Vitis mustangensis | Mustang grape | |
| Vitis riparia | Riverbank grape River-bank grape | |
| Vitis rotundifolia | Muscadine Scuppernong grape | |
| Vitis rupestris | Sand grape | |
| Vitis vulpina | Frost grape | |
| Vulpia elliotea | Squirreltail fescue | |
| Vulpia octoflora | Common Sixweeks Grass Sixweeks fescue | |
| Waldsteinia fragarioides | Appalachian barren strawberry Barren Strawberry | |
| Waldsteinia fragarioides ssp. fragarioides | Appalachian barren strawberry | |
| 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 | |
| Xanthium strumarium | Rough cockleburr | |
| Xanthium strumarium var. canadense | Canada cockleburr | |
| Xanthocephalum gymnospermoides | Gummy broomweed Gummy snakeweed San Pedro matchweed | |
| Xanthorhiza simplicissima | Shrub yellowroot 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 | |
| Xylorhiza cognata | Mecca woodyaster | |
| Xylorhiza glabriuscula var. glabriuscula | Smooth woodyaster | |
| Xylorhiza orcuttii | Orcutt's aster Borrego aster Mojave aster | |
| Xylorhiza tortifolia | Mojave woodyaster Mojave aster Desert aster | |
| Xylorhiza tortifolia var. tortifolia | Mojave aster Mojave woodyaster | |
| Xylorhiza wrightii | Big Bend woodyaster Terlingua aster Gyp daisy Gypsum daisy Big Bend aster | |
| Xylosma flexuosa | Brush holly Brushholly | |
| Xyris ambigua | Coastal plain yelloweyed grass Coastalplain yelloweyed grass | |
| Xyris difformis | Bog yelloweyed grass | |
| Xyris difformis var. difformis | Bog yelloweyed grass | |
| Xyris montana | Northern yelloweyed grass | |
| Xyris platylepis | Broad-scale Yellow-eyed Grass Tall yelloweyed grass | |
| Yeatesia platystegia | Montell bractspike Wild Shrimp Plant | |
| Yucca aloifolia | Aloe yucca Spanish dagger | |
| Yucca angustissima | Narrowleaf yucca | |
| Yucca arkansana | Arkansas yucca Softleaf yucca | |
| Yucca baccata | Banana yucca Blue yucca Fleshy-fruited yucca Datil | |
| Yucca baileyi var. navajoa | Navajo yucca | |
| Yucca brevifolia | Joshua tree | |
| Yucca campestris | Plains yucca | |
| Yucca constricta | Buckley yucca Buckley's yucca | |
| Yucca elata | Soaptree yucca Soaptree Palmilla Palmella Amole | |
| Yucca faxoniana | Eve's needle Faxon yucca Palma samandoca Palma barreta Spanish bayonet | |
| Yucca filamentosa | Adam's needle | |
| Yucca flaccida | Weak-leaf yucca | |
| Yucca glauca | Soapweed yucca Narrowleaf yucca Plains yucca Beargrass | |
| Yucca glauca var. glauca | Narrow-leaf yucca Soapweed yucca | |
| Yucca gloriosa | Moundlily yucca | |
| Yucca louisianensis | Gulf Coast yucca | |
| Yucca madrensis | Mountain yucca | |
| Yucca pallida | Pale-leaf yucca | |
| Yucca reverchonii | San Angelo yucca | |
| Yucca rupicola | Twistleaf yucca Twisted-leaf yucca Texas yucca | |
| Yucca schidigera | Mojave yucca | |
| Yucca schottii | Schott's yucca Hoary Yucca Mountain Yucca | |
| Yucca thompsoniana | Thompson's yucca Thompson Yucca Beaked yucca | |
| Yucca torreyi | Torrey's yucca Torrey yucca | |
| Yucca treculeana | Spanish Dagger Don Quixote's Lance Palma Pita | |
| Zamia pumila | Coontie Florida arrowroot | |
| Zamia pumila ssp. pumila | Coontie | |
| Zannichellia palustris | Horned pondweed Horned poolmat Horned-pondweed | |
| Zanthoxylum americanum | Common pricklyash Toothache tree Prickly ash | |
| scientific name | common name(s) | image gallery |