This name is a synonym of Rhododendron primuliflorum Bureau & Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12304827) with original publication details: Notes Roy. Bot. Gard. Edinburgh 11(52–53): 150–153 1919.
This name was in version 1 of The Plant List, record tro-12304827.