This name is a synonym of Rhododendron griffithianum Wight.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060044) with original publication details: Bot. Mag. 84: , pl. 5065 1858.
This name was in version 1 of The Plant List, record tro-50060044, and has not been changed.