This name is a synonym of Rhododendron riparioides (Cullen) Cubey.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50156491) with original publication details: Acta Bot. Yunnan. 4(3): 256 1982.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:921401-1.
This name was in version 1 of The Plant List, record tro-50156491, and has not been changed.