[Wikipedia] Loss of Pure Form: Fernald's are no longer found in pure form in Marin County, however; they have naturally hybridized with Iris douglasiana in this area. (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: 03/30/2025).