This name is a synonym of Oenothera oakesiana (A.Gray) G.T.Robbins ex S.Watson.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Abh. Naturwiss. Vereins Bremen 18: 182 1904.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:613514-1.
This name was in version 1 of The Plant List, record kew-2399182.