This name is a synonym of Selenicereus extensus (Salm-Dyck ex DC.) Leuenb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50183393) with original publication details: Stand. Cycl. Hort. 3: 1626 1915.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:125388-2.
This name was in version 1 of The Plant List, record tro-50183393.