This name is a synonym of Rhododendron lacteum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060356) with original publication details: Repert. Spec. Nov. Regni Veg. 12(325–330): 285 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332841-1.
This name was in version 1 of The Plant List, record tro-50060356, and has not been changed.