This name is a synonym of Plectranthus lanuginosus (Hochst. ex Benth.) Agnew.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 45844) with original publication details: Linnaea 37: 321 1872.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:445900-1.
This name was in version 1 of The Plant List, record kew-45844.