This name is a synonym of Rhododendron hemsleyanum var. chengianum (W.P. Fang) W.P. Fang ex W.K. Hu.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060084) with original publication details: Icon. Pl. Omeiesium 1(1): , pl. 31 1942.
This name was in version 1 of The Plant List, record tro-50060084, and has not been changed.