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 12304987) with original publication details: Notes Roy. Bot. Gard. Edinburgh 15(75): 312–313 1927.
This name was in version 1 of The Plant List, record tro-12304987, and has not been changed.