This name is a synonym of Plectranthus emirnensis (Baker) Hedge.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 144335) with original publication details: J. Linn. Soc., Bot. 21: 433 1885.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:453484-1.
This name was in version 1 of The Plant List, record kew-144335, and has not been changed.