Xanthium strumarium --- rough cockleburr
Xanthium strumarium var. canadense --- Canada cockleburr
Xerophyllum tenax --- common beargrass
Xylorhiza glabriuscula --- smooth woodyaster
Xylorhiza glabriuscula var. glabriuscula --- smooth woodyaster
Xylorhiza glabriuscula var. villosa --- villous woodyaster

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