This name is a synonym of Rhododendron spinuliferum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303930) with original publication details: Repert. Spec. Nov. Regni Veg. 12(325–330): 284–285 1913.
This name was in version 1 of The Plant List, record tro-12303930.