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 12303838) with original publication details: Repert. Spec. Nov. Regni Veg. 9(222–226): 448 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:333260-1.
This name was in version 1 of The Plant List, record tro-12303838, and has not been changed.