Threatened by fire, mining, logging, and shading. Possibly threatened by vehicles. See Flora of California 3(2):437 (1943) by W.L. Jepson for original description, and Phytologia 72(1):9-16 (1992) for revised nomenclature.
California Native Plant Society (CNPS).
Inventory of Rare and Endangered Plants (online edition, v8-01a).
California Native Plant Society. Sacramento, CA. Accessed on
.