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FNA | Family List | FNA Vol. 20 | Asteraceae | Xylorhiza

8a. Xylorhiza tortifolia (Torrey & A. Gray) Greene var. imberbis (Cronquist) T. J. Watson, Brittonia. 29: 211. 1977.

Smooth Mojave woody-aster

Machaeranthera tortifolia (Torrey & A. Gray) Cronquist & D. D. Keck var. imberbis Cronquist, Leafl. W. Bot. 10: 12. 1963

Stems, leaves, and involucres glabrous, stipitate-glandular. Leaf margins sparsely piloso-villous to puberulent. 2n = 12.

Flowering Apr–May(–Jun). Sandy or gravelly slopes and flats, in pinyon-juniper, sagebrush, and blackbrush zones; 600–1900 m; Ariz., Nev., Utah.

The geographic distribution of var. imberbis usually follows the canyons of the Colorado River of Utah and adjacent Arizona at least to Toroweap Point; it also occurs in Clark and Nye counties, Nevada, where it intergrades with var. tortifolia (A. Cronquist 1994).


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