This name is a synonym of Rhododendron simsii Planch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060757) with original publication details: Brit. Fl. Gard. 2: , pl. 128 1833.
This name was in version 1 of The Plant List, record tro-50060757.