Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Commelinids: Poales
Manual of the Grasses of the US (Hitchcock & Chase, 1950)
Manual of the Southeastern Flora (Small, 1933)
Green Foxtail, Green Bristlegrass
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Gill Newberry gn09_setaria_viridis
Panicle erect or ~ nodding, cylindric but tapering a little at the summit, per Manual of the Grasses of the United States.