This name is a synonym of Oenothera longissima subsp. clutei (A. Nelson) Munz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50266472) with original publication details: Amer. Bot. (Binghamton) 28(1): 22–24 1922.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:172889-2.
This name was in version 1 of The Plant List, record tro-50266472.