Abstract
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.
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A portion of a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Botany, University of Texas at Austin, August, 1972.
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Watson, T.J. The taxonomy of xylorhiza (Asteraceae-Astereae). Brittonia 29, 199–216 (1977). https://doi.org/10.2307/2805854
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DOI: https://doi.org/10.2307/2805854