This name is a synonym of Oenothera cespitosa subsp. marginata (Nutt. ex Hook. & Arn.) Munz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50006809) with original publication details: Mem. Amer. Acad. Arts, n.s. 4(1): 45 1849.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:613704-1.
This name was in version 1 of The Plant List, record tro-50006809.