Not sure of the subspecies here; perhaps E.e. luestherae?
I've seen Mount Diablo forms referred to as bayensis, but that's
usually restricted to an endangered form restricted to Santa Clara
County (formerly also San Mateo County).
Mount Diablo, Contra Costa County, CA, 5/11/2003
Mount Diablo, Contra Costa County, CA, 5/11/2003
Pinnacles National Monument, CA, 5/31/2003