This name is a synonym of Rhododendron mariae Hance.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060823) with original publication details: Guihaia 3(3): 178–179, photo 2 1983.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:902910-1.
This name was in version 1 of The Plant List, record tro-50060823.