[Wikipedia] Conservation Status, Rarity: It is listed as a special concern species in Connecticut and is believed extirpated.[3] It is endangered in Illinois, Indiana, and Ohio. It is listed as endangered and extirpated in Maryland, threatened in Iowa, exploitably vulnerable in New York, special concern in Rhode Island, and sensitive in Washington (state).[4]
This species is extremely rare in most European countries. In Ukraine only one place is known.[5] (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).
