This name is a synonym of Delphinium occidentale (S.Watson) S.Watson ex Coult..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Ill. Fl. Pacific States 2: 187 1944.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:77498-2.
This name was in version 1 of The Plant List, record kew-2760363, and has not been changed.