Annual. Culms loosely tufted, 40–100 cm tall, 2–5-noded. Leaf sheaths hairy; leaf blades 10–20 cm × 3–6 mm, scattered pubescent, margins and adaxial surface scabrid; ligule 2–4 mm. Panicle lax, 15–30 × 10–20 cm; branches clustered, spreading or nodding, scabrid, each bearing 5–8 spikelets. Spikelets oblong-lanceolate, 12–22 × 3–4 mm, tinged with purple, florets 5–8, overlapping; rachilla ca. 2 mm; glumes unequal, margins membranous, apices acuminate, lower glume 4–6 mm, 3-veined, upper glume 6–8 mm, 5–7-veined; lemmas broadly elliptic or obovate, 7–9 mm, back rounded, 7-veined, glabrous, margins membranous with obtuse angle, apex minutely 2-toothed, awned from ca. 2 mm below apex; awn 7–10 mm, slender, straight; palea subequal to lemma, keels ciliate. Anthers 3–4.5 mm. Caryopsis blackish brown, 7–9 × ca. 1 mm. Fl. and fr. Jun–Aug. 2n = 14.
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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.
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