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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.
Tufted annual or biennial, 150-900 mm high. Leaf blade 60-150 x 3-6 mm; ligule an unfringed membrane. Inflorescence an open or contracted panicle, 60-160 x 30-60 mm, eventually dropping to one side; pedicels, at least some, as long as to longer than spikelets; culm glabrous below inflorescences. Spikelet 10-25 x 4-7 mm, almost linear at maturity, slightly laterally compressed; glumes unequal, shorter than spikelet; lower glume 3-5-nerved; upper glume 5-9-nerved. Florets 4-many; lemma 7-9 mm long, back rounded, obtuse, apex lobed, awn 3-8 mm long, inserted just below apex, palea much shorter than lemma, keels ciliate; ovary with a conspicuous hairy appendage at apex; anther 0.5-1.7 mm long. Flowering time Sept.-Dec.
Tufted annual or biennial 150-900 mm high. Leaf blade 60-150 x 3-6 mm, hairy. Inflorescence 60-160 x 30-60 mm, open, eventually dropping to one side; pedicels with at least some as long as to longer than spikelets; culm glabrous below inflorescence. Spikelet 10-25(28) x 4-7 mm, almost linear at maturity, slightly laterally compressed; lower glume 3-5-nerved; upper glume 5-9-nerved; lemma 7-9 mm long, rounded on back, apex obtuse, distinctly bifid; awn 3-8(10) mm long, inserted less than 1.5 mm below apex; palea much shorter than lemma, keels ciliate; callus scar circular; anthers 0.5-1.7 mm long.
Annual; up to 0.9 m high; tufted. Leaf blades 60-150 x 3-6 mm. Flowers: panicle lax; pedicels (at least some of them) longer than spikelets; spikelets 10-25 x 4-7 mm; spikelets almost linear at maturity; lower glume 3-5-nerved; upper 5-9-nerved; lemmas 7-9 mm long; lemma apex rounded to subacute; awns 3-8 mm long; anthers 0.5-1.7 mm long.
Like B. pectinatus but awns not exceeding lemmas, 3-8 mm long.
