This name is a synonym of Pennisetum sieberianum (Schltdl.) Stapf & C.E.Hubb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50109650) with original publication details: Ann. Bot. Syst. 6: 966 1861.
This name was in version 1 of The Plant List, record tro-50109650.