This name is a synonym of Rhododendron oldhamii Maxim..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50067711) with original publication details: J. Soc. Trop. Agric. 5: 405 1933.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:333023-1.
This name was in version 1 of The Plant List, record tro-50067711, and has not been changed.