This name is a synonym of Rhododendron glischrum subsp. rude (Tagg & Forrest) D.F. Chamb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12305005) with original publication details: Sp. Rhodod. 141 1930.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:333266-1.
This name was in version 1 of The Plant List, record tro-12305005, and has not been changed.