This name is a synonym of Brachiaria umbellata (Trin.) Clayton.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 430712) with original publication details: Gram. Panic. 238 1826.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:413438-1.
This name was in version 1 of The Plant List, record kew-430712, and has not been changed.