Jepson Flora Project: Geranium retrorsum:Correspondence 4 indicates that plants in California previously misidentified as Geranium retrorsum belong instead to Geranium core-core Steud.
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: 04/03/2025).