Reasons: California endemic known from 10 current and one historic populations, all on National Park/Forest lands. Some populations might be very large. Impacted by hikers who trample on plants.
Range Extent Comments: California endemic found only in Fresno County (Skinner, 1997).
Number of Occurrences Comments: Known from eleven occurrences: ten recent and one historic; seven are ranked in excellent or good condition (California Department of Fish and Game, 2016).
Population Size Comments: Several occurrences with 1000-6000 plants each. A couple of populatios in Fresno county were estimated to have millions of plants in 1980-81 (California Department of Fish and Game, 1997).
Overall Threat Impact Comments: Trampling by hikers and people camping, impacts by trail maintenance and rerouting (California Department of Fish and Game, 1997).
Global Range: California endemic found only in Fresno County (Skinner, 1997).
Habitat Comments: Granitic substrates; on sand, among rocks, or on ledges. Found within open mixed oak-conifer woods and coniferous forest communities (Lodgepole Forest, Red Fir Forest, and Yellow Pine Forest). 1065 - 1750 m.
Munz, P.A. 1968. Supplement to a California flora. Univ. California Press. Berkeley. 224 pp.
Rollins, R.C. 1993a. The Cruciferae of continental North America: Systematics of the mustard family from the Arctic to Panama. Stanford Univ. Press, Stanford, California. 976 pp.