This name is a synonym of Oenothera cespitosa subsp. australis (Wooton & Standl.) Munz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50104088) with original publication details: Contr. U.S. Natl. Herb. 16(4): 156 1913.
This name was in version 1 of The Plant List, record tro-50104088.