This name is a synonym of Frangula californica subsp. ursina (Greene) Kartesz & Gandhi.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50326808) with original publication details: Man. Calif. Shrubs 329 1939.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:218963-2.
This name was in version 1 of The Plant List, record tro-50326808, and has not been changed.