This name is a synonym of Plectranthus seretii (De Wild.) Vollesen.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 46104) with original publication details: Bol. Soc. Ibér. Ci. Nat. 19: 122 1920.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:446167-1.
This name was in version 1 of The Plant List, record kew-46104, and has not been changed.