This name is a synonym of Plectranthus pentheri (Gürke ex Zahlbr.) van Jaarsv. & T.J.Edwards.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 46053) with original publication details: Ann. K. K. Naturhist. Hofmus. 20: 48 1905.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:446116-1.
This name was in version 1 of The Plant List, record kew-46053, and has not been changed.