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The taxonomy of xylorhiza (Asteraceae-Astereae)

As treated here,Xylorhiza is a genus of eight species and two varieties of shrubs and suffruticose perennials. The relationships of the genus with others in the tribe Astereae is in need of more intensive study. However,Xylorhiza is easily distinguished fromMachaeranthera, to which there is purportedly a close relationship, and merits generic status.