This name is a synonym of Oenothera eriensis var. niagarensis (R.R. Gates) R.R. Gates.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50129509) with original publication details: Phil. Trans. R. Soc. B 226: 326 1936.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:173220-2.
This name was in version 1 of The Plant List, record tro-50129509.