This name is a synonym of Rhododendron triflorum var. bauhiniiflorum (Watt ex Hutch.) Cullen in Cullen & D. F. Chamb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12303906) with original publication details: The Species of Rhododendron 785 1930.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332010-1.
This name was in version 1 of The Plant List, record tro-12303906, and has not been changed.