This name is a synonym of Rhododendron moulmainense Hook..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50005673) with original publication details: J. Bot. (Morot) 12(15–16): 264 1898.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:333026-1.
This name was in version 1 of The Plant List, record tro-50005673, and has not been changed.