This name is a synonym of Rhododendron flavidum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303980) with original publication details: Gard. Chron. 47: 4 1910.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:333135-1.
This name was in version 1 of The Plant List, record tro-12303980.