This name is a synonym of Cymbopogon schoenanthus subsp. proximus (Hochst. ex A.Rich.) Maire & Weiller.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25549401) with original publication details: Fl. Trop. Afr. 9: 271 1919.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:396997-1.
This name was in version 1 of The Plant List, record tro-25549401.