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| scientific name | common name(s) | image gallery |
| 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 | |
| Zanthoxylum clava-herculis | Hercules' club | |
| scientific name | common name(s) | image gallery |