Echinochloa muricata var. muricata  
Family: Poaceae
barnyard grass, cockspur grass, rough barnyard grass
[Echinochloa crus-galli f. longiseta (L.) P.Beauv., Echinochloa muricata var. ludoviciana (P.Beauv.) Fernald, Echinochloa pungens (Poir.) Rydb., Echinochloa pungens var. ludoviciana (Poir.) Rydb.]
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
Echinochloa muricata var. muricata image
Echinochloa muricata var. muricata image
Echinochloa muricata var. muricata image
Echinochloa muricata var. muricata image