This name is a synonym of Oenothera arequipensis Munz & I.M. Johnst..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 23200389) with original publication details: Contr. Gray Herb. 75: 20 1925.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:173118-2.
This name was in version 1 of The Plant List, record tro-23200389, and has not been changed.