Complete list of species
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| scientific name | common name(s) | image gallery |
| 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 |
