Raven notes this species is rare at Point Dume in the Santa Monica Mountains. A herbarium specimen was examined from the El Segundo Dunes. Lewis' Evening Primrose is severely declining in San Diego County, and likely throughout its U.S. range. The small stature of the plant, thick quadrangular seed capsule, and sandy microhabitat near the beach are typical of this species. Focused surveys of all known historical sites and potential coastal habitat are necessary to make more definitive assessments.
More information is needed.
Until such information is available, all populations should be protected. Copyright May 1994 Craig H. Reiser.