This name is a synonym of Rhododendron siderophyllum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303840) with original publication details: Repert. Spec. Nov. Regni Veg. 13(368–369): 340 1914.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332650-1.
This name was in version 1 of The Plant List, record tro-12303840, and has not been changed.