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 50060513) with original publication details: Notes Roy. Bot. Gard. Edinburgh 37(2): 333 1979.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:880166-1.
This name was in version 1 of The Plant List, record tro-50060513, and has not been changed.