This name is a synonym of Rhododendron hunnewellianum Rehder & E.H. Wilson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060250) with original publication details: Repert. Spec. Nov. Regni Veg. 17(486–491): 196 1921.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332762-1.
This name was in version 1 of The Plant List, record tro-50060250.