[pnwflowers.com] Description, Habitat: Flowers with central cluster of stamens and 4 glands each with pair of points shaped like thick horns, 3-lobed ovary hanging to one side. Grows in shady sites in foothills and is widespread. Moist Riverbanks, West-Side Forest (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).