Threatened by development, mining, recreational activities, and vehicles. Potentially threatened by vegetation/fuel management and fire suppression. See Proceedings of the American Academy of Arts and Sciences 20:307 (1885) for original description, and Annals of the Missouri Botanical Garden 11(2-3):256-257 (1924) 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
.