[Wikipedia] Limited Range, Habitat: It is known by the common name Eastwood's bellflower. It is endemic to California, where it grows in the serpentine soils of the hills and mountains surrounding the San Francisco Bay Area. It is a flower of the chaparral plant community. (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]. 2024. Berkeley, California:The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 09/08/2024).