This name is a synonym of Rhododendron rigidum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303858) with original publication details: Sp. Rhodod. 798 1930.
This name was in version 1 of The Plant List, record tro-12303858, and has not been changed.