This name is a synonym of Microstegium falconeri (Hook.f.) Clayton.
The record derives from WCSP which reports it as a synonym (record 420877) with original publication details: Hooker's Icon. Pl. 25: t. 2466 1896.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:406331-1.