This name is a synonym of Rhododendron neriiflorum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060492) with original publication details: Notes Roy. Bot. Gard. Edinburgh 13: 43 1920.
This name was in version 1 of The Plant List, record tro-50060492.