[Wikipedia] Range, Habitat, Common Names, Similarity to C. amoena: Clarkia rubicunda is a flowering plant endemic to California. It is found mostly on the Central Coast part of the state. The plant is known by the common names Ruby Chalice Clarkia and Farewell to Spring. It is similar in appearance to another flower of genus Clarkia, the Clarkia amoena, also called "Farewell to Spring". (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).