This name is a synonym of Rhododendron neriiflorum var. appropinquans (Tagg & Forrest) W.K. Hu.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060515) with original publication details: Indian Forester 105: 685, pl. s.n. 1979.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:333460-1.
This name was in version 1 of The Plant List, record tro-50060515, and has not been changed.