This name is a synonym of Plectranthus barbatus Andrews.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 45841) with original publication details: Wiss. Erg. Deut. Zentr.-Afr. Exped., Bot. 2: 550 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:445896-1.
This name was in version 1 of The Plant List, record kew-45841.