This name is a synonym of Rhododendron simiarum Hance.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060236) with original publication details: Bull. Soc. Bot. France 46: 210 1899.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332440-1.
This name was in version 1 of The Plant List, record tro-50060236.