This name is a synonym of Rhododendron haematodes subsp. chaetomallum (Balf. f. & Forrest) D.F. Chamb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060485) with original publication details: Notes Roy. Bot. Gard. Edinburgh 16(79): 189 1931.
This name was in version 1 of The Plant List, record tro-50060485, and has not been changed.