This name is a synonym of Plectranthus koualensis (A.Chev. ex Hutch. & Dalziel) B.J.Pollard & A.J.Paton.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 192873) with original publication details: J. Linn. Soc., Bot. 58: 270 1962.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:459165-1.
This name was in version 1 of The Plant List, record kew-192873, and has not been changed.