This name is a synonym of Oenothera multicaulis Ruiz & Pav..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 23200808) with original publication details: J. Linn. Soc., Bot. 22: 38 1885.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:173203-2.
This name was in version 1 of The Plant List, record tro-23200808.