This name is a synonym of Rhododendron minus var. chapmanii (Alph. Wood) Gandhi & Zarucchi.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50303850) with original publication details: Amer. Bot. Fl. 204 1870.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:219521-2.
This name was in version 1 of The Plant List, record tro-50303850.