[Oregon Dept of Ag] Origins and Introduction: Common crupina is native to the Mediterranean region. The source and means of its introduction into the U.S. is not known. The first population was discovered in Idaho in 1969. (link added by Jessica Johnston)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025. Berkeley, California:The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 01/10/2025).