This name is a synonym of Rhododendron argyrophyllum subsp. omeiense (Rehder & E.H. Wilson) D.F. Chamb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 12305068) with original publication details: Pl. Wilson. 1(3): 527 1913.
This name was in version 1 of The Plant List, record tro-12305068, and has not been changed.