Draba asprella var. stelligera
in H. G. A. Engler, Pflanzenr. 89[IV,105]: 106. 1927.
Synonyms: Draba asprella var. kaibabensis C. L. Hitchcock
Treatment appears in FNA Volume 7. Treatment on page 293.
Revision as of 23:53, 16 December 2019 by FNA>Volume Importer
Fruit valves puberulent, trichomes 2–4-rayed, 0.1–0.2 mm.
Phenology: Flowering Apr–Jul.
Habitat: On and around limestone and sandstone rock outcrops in pine-oak and pinyon-juniper communities
Elevation: 1500-2400 m
Discussion
Of conservation concern.
Variety stelligera is known from Coconino, Gila, and Yavapai counties in northern and central Arizona. The difference between vars. kaibabensis and stelligera rests on trichome density and the proportion of simple versus branched hairs on the leaves. These features are highly variable and we find no dependable characteristics separating populations on the North Rim of the Grand Canyon from those to the south.
Selected References
None.
Lower Taxa
None.