This name is a synonym of Oenothera torulosa f. cruciata (S. Watson) H. Lév..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50082544) with original publication details: Proc. Amer. Acad. Arts 8: 594 1873.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:172941-2.
This name was in version 1 of The Plant List, record tro-50082544.