Known only from Laguna de Santa Rosa and the Sonoma area. Threatened by urbanization, grazing, and agriculture. Possibly threatened by non-native plants, foot traffic and road maintenance. See Madroño 9(3):103-104 (1947) 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
.