restricted to southern Arizona, extreme southeast California, and Sonora Mexico
highly adapted desert succulent, but intolerant of more than twelve subfreezing hours per year
declined with post-Hypsithermal thermal declines; also collection and grazing stresses
References:
Brown, J. H. and Gibson, A. C. Biogeography. LOC QH84.B76 1983 ISBN 0-8016-0824-4 p. 61
Sonoran Desert Museum, Tucson Arizona
U.S. Fish & Wildlife Service, Endangered Species Home Page
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