This name is a synonym of Oenothera hybrida var. ambigua (Nutt.) S.F. Blake.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50127218) with original publication details: Gen. N. Amer. Pl. 1: 247 1818.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:172976-2.
This name was in version 1 of The Plant List, record tro-50127218.