This name is a synonym of Rhododendron saluenense var. prostratum (W.W. Sm.) R.C. Fang.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12304049) with original publication details: Notes Roy. Bot. Gard. Edinburgh 13(61): 38–39 1920.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332249-1.
This name was in version 1 of The Plant List, record tro-12304049, and has not been changed.