This name is a synonym of Oenothera deltoides var. decumbens (Parry) Munz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50104109) with original publication details: Amer. Naturalist 9(5): 270 1875.
This name was in version 1 of The Plant List, record tro-50104109.