This name is a synonym of Oenothera stricta subsp. altissima W. Dietr..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 23200370).
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:172798-2.
This name was in version 1 of The Plant List, record tro-23200370, and has not been changed.