Abstract
Data on rate of germination, rate of growth, and temperature and moisture responses of croosotebush (Larrea divaricata Cav.) seedlings from the Sonoran Desert and Chihuahuan Desert suggest that the species as it occurs in North America is comprised of at least two major genetic population systems or ecotypes. Compared to the Chihuahuan Desert ecotype, that of the Sonoran Desert is characterized by a taller, more erect and more open growth form, more slender and less incurved leaflets, slower germination rate, slower initial growth rate of the seedling, less tolerance for low temperature, and greater tolerance for low moisture.
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