This name is a synonym of Rhododendron ambiguum Hemsl..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303909) with original publication details: Icon. Pl. Omeiesium 1(1): , pl. 36 1942.
This name was in version 1 of The Plant List, record tro-12303909, and has not been changed.