[explorer.natureserve.org] Range, Habitat: Isoetes orcuttii occurs from Baja California in Mexico northward through California to southwestern Oregon in the western United States. The species primary habitat is vernal pools but it has been found in other habitats. (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: 05/12/2025).