[Wikipedia] Limited Range: The plant is endemic to Northern California. It is only found within Siskiyou County, in the Scott Mountains of the Klamath Range, and the Shasta Valley Mountains of the southern Cascade Range (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: 03/28/2025).