Protected in part in Coachella Valley Preserve System. Threatened by urbanization, vehicles, road widening, non-native plants, flood control projects, and wind energy development. See Memoirs of the New York Botanical Garden 13:951-952 (1964) for taxonomic treatment.
California Native Plant Society (CNPS).
Inventory of Rare and Endangered Plants (online edition, v8-01a).
California Native Plant Society. Sacramento, CA. Accessed on
.