This name is a synonym of Oenothera drummondii subsp. thalassaphila (Brandegee) W. Dietr. & W.L. Wagner.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 23202735) with original publication details: Univ. Calif. Publ. Bot. 10(2): 185 1922.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:281553-2.
This name was in version 1 of The Plant List, record tro-23202735.