This name is a synonym of Rhododendron sanguineum var. himertum (Balf. f. & Forrest) D.F. Chamb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060542) with original publication details: Sp. Rhodod. 533 1930.
This name was in version 1 of The Plant List, record tro-50060542, and has not been changed.