This name is a synonym of Rhododendron polycladum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303988) with original publication details: Gard. Chron. 91: 326 1932.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332223-1.
This name was in version 1 of The Plant List, record tro-12303988, and has not been changed.