This name is a synonym of Rhododendron mariesii Hemsl. & E.H. Wilson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50069284) with original publication details: Survey Gen. Rhododendron S. China 96, f. 22, 3 1983.
This name was in version 1 of The Plant List, record tro-50069284, and has not been changed.