Known in CA from fewer than 5 occurrences. One location in Anza-Borrego does not appear to be a naturally occurring population; DNA analysis pending. Plant not seen in SDG Co. in several decades. Threatened by vehicles in the Algodones Dunes. Threatened elsewhere by vehicles, grazing and trampling, foot traffic, non-native plants, development, and hydrological alterations. See Bulletin of the Southern California Academy of Sciences 31:67 (1932) for original description, and Memoirs of the New York Botanical Garden 13:928 (1964) for taxonomic treatment.