Sporobolus clandestinus (Biehler) Hitchc.  
Family: Poaceae
hidden drop-seed, rough drop-seed, rough rush grass
[Sporobolus asper var. canovirens (Michx.) Kunth, Sporobolus asper var. clandestinus (Michx.) Kunth, Sporobolus canovirens Nash, Sporobolus clandestinus var. canovirens (Biehler) Hitchc., Sporobolus longifolius (Torr.) A.W.Wood]
Sporobolus clandestinus image
from USDA Plants website  
Sporobolus clandestinus image
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