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)
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JK Marlow jkm0409d_13
September Greenville County SC
Pennisetum's spikelets are surrounded by an involucre of bristles, per Manual of the Grasses of the United States.