This name is a synonym of Rhododendron argyrophyllum Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50004924) with original publication details: Bot. Jahrb. Syst. 29(3–4): 512 1900.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332171-1.
This name was in version 1 of The Plant List, record tro-50004924.