Xylorhiza tortifolia var. imberbis (Cronq.) T.J. Wats.  
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Family: Asteraceae
imberis woodyaster
[Machaeranthera tortifolia var. imberbis Cronq., moreXylorhiza imberbis]
Xylorhiza tortifolia var. imberbis image
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Guy L. Nesom in Flora of North America (vol. 20)
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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Xylorhiza tortifolia var. imberbis
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