Bromus arvensis L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Annual 3–10 dm, the culms glabrous; sheaths with scattered hairs; blades 10–20 cm × 2–6 mm, flat, sparsely hairy; panicle 15–30 cm, erect or eventually nodding, with long, slender, ascending to suberect branches; spikelets 10–25 mm, 4–10-fld; first glume 4–6 mm, 3(5)-veined, the second 6–8 mm, 5- or 7-veined; lemmas 7–9 mm, with a straight awn 6–10 mm; palea about equaling the lemma; anthers (3–)4–5 mm; 2n=14. Native of s. Europe, sparingly intr. in our range and elsewhere in the U.S.