This name is a synonym of Plectranthus glabratus (Benth.) Alston.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 46154) with original publication details: Labiat. Gen. Spec. 58 1832.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:446215-1.
This name was in version 1 of The Plant List, record kew-46154, and has not been changed.