This name is a synonym of Rhododendron pachypodum Balf. f. & W.W. Sm..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303803) with original publication details: Notes Roy. Bot. Gard. Edinburgh 12(56): 63–64 1919.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:333269-1.
This name was in version 1 of The Plant List, record tro-12303803.