This name is a synonym of Plectranthus tetragonus Gürke.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 46130) with original publication details: Ann. Soc. Sci. Bruxelles, Sér. B 49: 106 1929.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:446192-1.
This name was in version 1 of The Plant List, record kew-46130.