This name is a synonym of Rhododendron oreotrephes W.W. Sm..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50156165) with original publication details: J. Roy. Hort. Soc. 60: 326 1935.
This name was in version 1 of The Plant List, record tro-50156165, and has not been changed.