This name is a synonym of Frangula californica subsp. occidentalis (Howell) Kartesz & Gandhi.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Pittonia 2: 15 1889.
This name was in version 1 of The Plant List, record kew-2523067, and has not been changed.