Previously CRPR 4.3; rarer than originally thought. Known only from the South Fork and Yolla Bolly Mtns. Threatened by vehicles, conifer encrouchment, and non-native plants. Potentially threatened by climate shifts. Possibly threatened by trampling and grazing. See Aliso 3:117 (1955) for original description and Kew Bulletin 55(4):1010 (2000) for revised nomenclature.