This name is a synonym of Rhododendron protistum Balf. f. & Forrest.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12304969) with original publication details: Notes Roy. Bot. Gard. Edinburgh 15(72): 108–109 1926.
This name was in version 1 of The Plant List, record tro-12304969.