This name is a synonym of Rhododendron strigillosum var. monosematum (Hutch.) T.L. Ming.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50060137) with original publication details: Bot. Mag. 142: , pl. 8675 1916.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:332908-1.
This name was in version 1 of The Plant List, record tro-50060137, and has not been changed.