This name is a synonym of Rhododendron thymifolium Maxim..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50156467) with original publication details: Rhodod. Soc. Not. Not. 3(No. 5): 287 1932.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:333389-1.
This name was in version 1 of The Plant List, record tro-50156467, and has not been changed.