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 50060759) with original publication details: Fl. Serres Jard. Eur. 9: 81 1853-1854.
This name was in version 1 of The Plant List, record tro-50060759.