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: Bull. Torrey Bot. Club 27: 261 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:77449-2.
This name was in version 1 of The Plant List, record kew-2760147, and has not been changed.