This name is a synonym of Plectranthus leptophyllus (Baker) A.J.Paton.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 46123) with original publication details: J. Linn. Soc., Bot. 40: 177 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:446186-1.
This name was in version 1 of The Plant List, record kew-46123.