This name is a synonym of Oenothera oakesiana var. tidestromii (Bartlett) R.R. Gates.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50129844) with original publication details: Cybele Columb. 1(1): 54–56, pl. 5 [right] 1914.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:173486-2.
This name was in version 1 of The Plant List, record tro-50129844, and has not been changed.