This name is a synonym of Rhododendron arizelum Balf. f. & Forrest.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060118) with original publication details: Notes Roy. Bot. Gard. Edinburgh 37(2): 330 1979.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:880204-1.
This name was in version 1 of The Plant List, record tro-50060118, and has not been changed.