Annual 3-12 dm, the culms glabrous, or puberulent below the nodes; lower sheaths softly retrorse-pilose, the upper glabrous or nearly so; blades flat, 1-7 mm wide, pilose; ligule 0.5-2.5 mm; panicle relatively short, 4-15(-20) cm, broad and open, the branches rather stiffly spreading or ascending, not flexuous or drooping, the pedicels mostly longer than the spikelets; spikelets 10-18(-30) mm, 4-10(12)-fld, slightly compressed; glumes scabrous or puberulent, the first 5-6(-7) mm, 3- or 5-veined, the second 6-7(-8.5) mm, 5-9-veined; lemmas 7-10 mm, 1.7-2.5 mm wide in side view, the veins faint, the terminal teeth not over 2 mm; awns 5-12 mm, straight or nearly so; palea less than 1.5 mm shorter than the lemma; anthers 0.7-1.7 mm; rachilla-joints 1.5-2 mm; 2n=14, 28, 56. Native of Europe, commonly intr. in disturbed sites in our range, w. to the Pacific.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.