This name is a synonym of Oenothera pumila var. pusilla (Michx.) Torr. & A. Gray.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50070145) with original publication details: Fl. Bor.-Amer. 1: 225–226 1803.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:613998-1.
This name was in version 1 of The Plant List, record tro-50070145.