Xylorhiza tortifolia var. imberbis

(Cronquist) T. J. Watson

Brittonia 29: 211. 1977.

Common names: Smooth Mojave woody-aster
Endemic
Basionym: Machaeranthera tortifolia var. imberbis Cronquist Leafl. W. Bot. 10: 12. 1963
Treatment appears in FNA Volume 20. Treatment on page 409. Mentioned on page 408.

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


Phenology: Flowering Apr–May(–Jun).
Habitat: Sandy or gravelly slopes and flats, in pinyon-juniper, sagebrush, and blackbrush zones
Elevation: 600–1900 m

Discussion

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).

Selected References

None.

Lower Taxa

None.
Guy L. Nesom +
(Cronquist) T. J. Watson +
Machaeranthera tortifolia var. imberbis +
Smooth Mojave woody-aster +
Ariz. +, Nev. +  and Utah. +
600–1900 m +
Sandy or gravelly slopes and flats, in pinyon-juniper, sagebrush, and blackbrush zones +
Flowering Apr–May(–Jun). +
Machaeranthera tortifolia +
Xylorhiza tortifolia var. imberbis +
Xylorhiza tortifolia +
variety +