This name is a synonym of Oenothera speciosa var. childsii (L.H. Bailey) Munz.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50090857) with original publication details: Cycl. Amer. Hort. 1121 1901.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:173480-2.
This name was in version 1 of The Plant List, record tro-50090857, and has not been changed.