Only NAP Co. occurrence (500A) may be introduced. Threatened by urbanization, agriculture, grazing, non-native plants, and vehicles. Possibly threatened by disking and hydrological alterations. See Brittonia 21:11-14 (1969) for original description.
California Native Plant Society (CNPS).
Inventory of Rare and Endangered Plants (online edition, v8-01a).
California Native Plant Society. Sacramento, CA. Accessed on
.