This name is a synonym of Rhododendron stamineum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060659) with original publication details: Bull. Soc. Agric. Sarthe 39: 49 1914.
This name was in version 1 of The Plant List, record tro-50060659.