[Wikipedia] Taxonomy: Two subtaxa are usually recognized, called subspecies or varieties.They can intergrade in some areas.
Phacelia campanularia ssp. campanularia – limited to the Sonoran Desert
Phacelia campanularia ssp. vasiformis – more common, with a wider range, and sometimes with larger flowers. (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: 03/31/2025).
