This name is a synonym of Costus dubius (Afzel.) K.Schum..
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 273260) with original publication details: Rem. Guin. 2: 9 1813.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:798338-1.
This name was in version 1 of The Plant List, record kew-273260, and has not been changed.