This name is a synonym of Oenothera tetragona var. fraseri (Pursh) Munz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50126504) with original publication details: Fl. Amer. Sept. 2: 734 1814.
This name was in version 1 of The Plant List, record tro-50126504.