Echinochloa muricata var. muricata
Family: Poaceae
barnyard grass, cockspur grass, rough barnyard grass
[Echinochloa crus-galli f. longiseta (L.) P.Beauv.,  more...]
Echinochloa muricata var. muricata image
from USDA Plants website  
Etymology: Echinochloa: Greek echinos for "hedgehog" and chloa for grass, referring to allusion of bristling awns
Plants: annual grass
Conservation Status: Native