This name is a synonym of Rhododendron taggianum Hutch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303792) with original publication details: Bot. Mag. 163: , pl. 9614 1942.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332552-1.
This name was in version 1 of The Plant List, record tro-12303792, and has not been changed.