This name is a synonym of Rhynchoglossum notonianum (Wall.) B.L. Burtt.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 100355152) with original publication details: Numer. List n. 409 .
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:812935-1.
This name was in version 1 of The Plant List, record tro-100355152.