It is cited in literature from a burn in Harbison Canyon, at Anahuac School, on the south fork of Featherstone Creek near Barona, at the north end of El Cajon Mountain northeast of Barona Mission, and at Silverwood Wildlife Sanctuary on the upper part of the chaparral trail. An old report from Murphy Canyon near the San Diego Mission likely represents a locale long since disturbed by urban impacts. It is also reported in Riverside County below the hamlet of Sage, on rocky, gentle hills in coarse sandy soil between chamise and manzanita. It was seen in chaparral understory near Colt Road and De Portola Road in western Riverside County. The status of the Mission Blue-cup in San Diego County is presumed stable.
More information is needed.
Given the dearth of collections and reports for this species, it is likely quite rare in San Diego County. All populations should be protected. The related ssp. Copyright May 1994 Craig H. Reiser.