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 12303892) with original publication details: Pl. Wilson. 1(3): 520–521 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:331939-1.
This name was in version 1 of The Plant List, record tro-12303892, and has not been changed.