This name is a synonym of Costus afer Ker Gawl..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an invalid name (record 234657) with original publication details: Explor. Bot. Afrique Occ. Franç. 1: 627 1920.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:872311-1.
This name was in version 1 of The Plant List, record kew-234657.