This name is a synonym of Rhododendron concinnum Hemsl..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303897) with original publication details: Rhododendron Year Book 17: 194 1963.
This name was in version 1 of The Plant List, record tro-12303897, and has not been changed.