This name is a synonym of Oenothera cheiranthifolia var. nitida (Greene) Munz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50082318) with original publication details: Pittonia 1(4): 70 1887.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:173221-2.
This name was in version 1 of The Plant List, record tro-50082318.