This name is a synonym of Rhododendron ovatum (Lindl.) Planch. ex Maxim..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50002923) with original publication details: Icon. Pl. Formosan. 3: 135 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332714-1.
This name was in version 1 of The Plant List, record tro-50002923.