This name is a synonym of Rhododendron calostrotum Balf. f. & Kingdon-Ward.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12304038) with original publication details: Sunyatsenia 3(4): 256 1937.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332680-1.
This name was in version 1 of The Plant List, record tro-12304038.