Echinochloa muricata var. microstachya Wiegand
Family: Poaceae
rough barnyard grass
[Echinochloa crus-galli var. frumentacea (L.) P.Beauv.,  more...]
Echinochloa muricata var. microstachya image
from USDA Plants website  
Echinochloa muricata var. microstachya image
University of Wisconsin-Stevens Point, Robert W. Freckmann Herbarium (UWSP)  
Etymology: Echinochloa: Greek echinos for "hedgehog" and chloa for grass, referring to allusion of bristling awns
Plants: annual grass
Conservation Status: Native