This name is a synonym of Oenothera kunthiana (Spach) Munz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50147936) with original publication details: N. Amer. Fl., ser. 2, 5: 82 1965.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:172950-2.
This name was in version 1 of The Plant List, record tro-50147936.