Distribution: Found throughout southern Canada and most of the United States.
Habitat: Cultivted fields and wasteland, usually where moist, especially along irrigation ditches.
Flowers: June - October
Origin: Introduced from Eurasia
Conservation Status: Not of concern
Annual, the culms decumbent to erect, pith-filled or hollow, 6-16 dm. tall, the nodes glabrous.
Sheaths open, somewhat compressed; ligules none; blades flat, 4-16 mm. broad.
Inflorescence a stiff panicle, the branches spreading to erect, at least 3 cm. long; spikelets subsessile, 3-4 mm. long, borne along one side of the panicle branches; spikelets 2-flowered, the lower flower sterile; glumes unequal, 3-nerved, unawned; sterile lemma acuminate and awn-tipped, the awn sometimes up to 30 mm. long, about equal to the second glume, the palea membranous, about half as long as the lemma; fertile lemma and palea acuminate, hardened, unawned; stamens 3.