This name is a synonym of Oenothera biennis var. austromontana (Munz) Cronquist.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50009594) with original publication details: N. Amer. Fl., ser. 2, 5: 134–135 1965.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:172757-2.
This name was in version 1 of The Plant List, record tro-50009594, and has not been changed.