This name is a synonym of Rhododendron decorum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50000680) with original publication details: Bull. Misc. Inform. Kew 1910(4): 110–111 1910.
This name was in version 1 of The Plant List, record tro-50000680.