This name is a synonym of Rhododendron henryi var. dunnii (E.H. Wilson) M.Y. He.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50049998) with original publication details: J. Arnold Arbor. 6(3): 170–171 1925.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332354-1.
This name was in version 1 of The Plant List, record tro-50049998, and has not been changed.