Streptanthus hispidus is an annual herb that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 1B.3 (rare, threatened, or endangered in CA and elsewhere).
[Wikipedia] Range, Threats: It is endemic to Contra Costa County, California, where it is known from fewer than 15 occurrences on and around Mount Diablo. It grows in rocky outcrops in grassland and chaparral habitat. It is threatened by habitat degradation, such as trampling by hikers and destruction during maintenance activities.[3] (link added by Mary Ann Machi)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 04/01/2025).
one or more occurrences