Annual. Culms erect, 20–60 cm tall, 3- or 4-noded. Leaf sheaths pubescent; leaf blades 5–20 cm, 2–4 mm wide, pubescent; ligule 1.5–2 mm. Panicle spreading, 8–15 cm, secund; branches 3–5 at lower nodes, slender, mostly curved, scabrid, pubescent, each bearing 1–8 slightly nodding spikelets. Spikelets 10–35(–50) mm; florets 4–8; rachilla internodes 2–3 mm; glumes narrowly lanceolate, margins membranous, lower glume 8–15 mm, 1–3-veined, upper glume 11–17 mm, 3–7-veined, apex acute, obtuse, or shortly aristiform; lemmas 9–22 mm, 1–1.5 mm wide in side view, 5–7-veined, scabrid or pubescent, margins thinly membranous, shiny, apex acuminate, acute, or obtuse, 2-toothed, awned from sinus, awn 12–25(–40) mm, slender, straight; palea shorter than or subequal to lemma, keels ciliate. Stamens 3; anthers 0.5–2 mm. Fl. and fr. May–Sep.
Annual; culms erect, up to 60 cm high. Leaf-blades up to 18 cm long, 2-4 mm wide; sheaths pubescent. Panicle up to 18 cm long, loose or dense, erect or nodding, the branches filiform, flexuous, bearing parallel clusters of spikelets, these usually all turned to one side. Spikelets narrowly wedge-shaped, very fragile, 4-8(-10)-flowered, the upper 1-3 florets sometimes much reduced or aborted, 25-40 mm long including the awns, the lemmas overlapping at first but gaping and exposing the internodes at maturity; glumes with silvery-hyaline margins, the lower narrowly lanceolate, 5-8 mm long, 1-nerved, the upper narrowly oblong-lanceolate, 7-11 mm long, 3-nerved; lemmas linear-lanceolate in side view, the lowest 9-14 mm long, involute, herbaceous with silvery-hyaline margins, 7-nerved, glabrous or pubescent, 2-toothed at the tip with a straight awn as long as or slightly longer than the lemma from between the teeth; palea shorter than the lemma, ciliolate on the keels; anthers 0.5-1 mm long.
Annual 2–7 dm; sheaths and blades soft-hairy, the latter 2–4 mm wide; ligule 1–2.5(–4) mm; infl 1–2 dm, often nodding, repeatedly but rather openly branched, bearing somewhat crowded, mostly drooping, 3–8-fld spikelets to 2(–3.5) cm on slender pedicels; glumes subulate, the first 5–7 mm, 1-veined, the second 8–11 mm, 3-veined; lemmas narrowly lanceolate, 8–12(–15) mm, evidently hairy or seldom glabrous, 1–1.5 mm wide in side-view, 5–7-veined, acuminate into slender scarious teeth 1–3 mm; awns (7–)10–17 mm; palea shorter than the lemma; anthers 0.5–0.7 mm; 2n=14. Native of Europe, now a common weed nearly throughout the U.S., esp. westward.
Tufted annual 100-250 mm high. Leaf blade 60-100 x 2-4 mm, hairy. Inflorescence open, drooping, spikelets ± secund; lower pedicels and branches with ± four spikelets; branches and pedicels twisted or curved, flexuous. Spikelet 8-15(20) x 2-4 mm, moderately laterally compressed, spikelet hairy to glabrous; lower glume 1-nerved; upper glume 7-12 mm long; 3-5-nerved; lemma 8-13 mm long, rounded on back, margins hyaline, bifid; awn 8-20 mm long, straight, arising well below apex; palea ciliate on keels, hairy between keels; callus scar circular, minutely hairy; anthers 0.5-1.0 mm long.
Ähnlich wie B. sterilis, aber nur 10–40 cm hoch, Stängel zuoberst unter der Rispe dicht und fein behaart, Rispe dicht, einseitswendig, überhängend. Rispenäste 2–3(–4) cm lang, weichhaarig, oft mit 3–5 Ährchen. Ährchen ohne die Grannen 1–2 cm
5–7. Bahnareale, Kiesgruben, Rebberge, Wegränder, Schuttplätze, kollin-montan(-subalpin). CH.
Sandy soil; in disturbed places such as on roadsides.
Naturalised from Europe; naturalised in many regions of the world. G, NC.
| Name | Language | Country | |
|---|---|---|---|
| Forasacco dei tetti | Italian | CH |
|
| Brome des toits | French | CH |
|
| Dach-Trespe | German | CH |
|
| Tschintschigniva da tetg | Raeto-Romance | CH |
|
