Annual. Culms erect, or geniculate at base, 30–100 cm tall, 1.5–2.5 mm in diam., 3–4-noded. Leaf sheaths usually loose, longer than internodes, glabrous; ligules scarious, ca. 0.5 mm, fimbriate at apex, pubescent on back; leaf blades flat, 3–25 × 0.3–0.5 cm, smooth and glabrous. Panicle elongated, 6–34 × 1.5–6 cm; branches slender, clustered or verticillate, glabrous in axils. Spikelets usually purplish at maturity, ovate, 1–2 mm, 4–8-flowered; rachilla distarticulating between florets from top downward at maturity. Glumes chartaceous, ovate-lanceolate, subequal, 0.6–0.8 mm, 1-veined, apex obtuse. Lemmas chartaceous, broadly elliptical, distinctly 3-veined, apex obtuse, lower lemma ca. 1 mm. Palea subequal to lemma, along 2 keels ciliolate. Stamens 2; anthers ca. 0.2 mm. Caryopsis red-brown, ovoid, 0.4–0.5 mm. Fl. and fr. Jun–Nov.
Tufted annual or short-lived perennial; culms 10-150 cm high, erect. Leaf-blades flat, up to 30 cm long and 5 mm wide; ligule membranous, 0.3-0.6 mm long, truncate, fimbriate. Panicle linear, 4-50 cm long; branches ascending close to the main axis or spreading and the panicle lanceolate to narrowly ovate or branches contracted in dense remote pseudo-whorls, typically 3-14 cm long, bare towards the base, the spikelets shortly pedicelled and appressed to the secondary branchlets or longer pedicelled and spreading. Spikelets 4-14-flowered, ovate-oblong, 1.3-3 mm long, breaking up from the apex, the rhachilla fragile; glumes narrowly ovate to broadly oblong-elliptic, subequal, 0.4-0.7 mm long, acute to obtuse; lemmas broadly ovate, 0.7-1 mm long, obtuse; anthers 2, 0.2 mm long. Caryopsis ellipsoid, 0.3-0.5 mm long.
Caryopsis 0.3–0.5 mm long, obovate.
Panicle 9–60 cm long, linear to lanceolate or narrowly ovate, contracted or spreading, the spikelets evenly distributed but often crowded on short pedicels less than 1 mm long, the primary branches not in whorls, terminating in a fertile spikelet, glabrous in the axils, eglandular.
Spikelets 1–2.5 × c. 1 mm, ovate-oblong, lightly laterally compressed, 4–8-flowered, the florets disarticulating from the apex downwards, the rhachilla fragile; glumes subequal, 0.4–0.8 mm long, reaching to about the middle of the adjacent lemmas, lightly keeled, narrowly lanceolate to narrowly oblong-elliptic in profile, glabrous, acute or obtuse at the apex; lemmas 0.6–0.9 mm long, lightly keeled, elliptic to ovate in profile, membranous with distinct lateral nerves, ± appressed to the rhachilla, those in opposite rows scarcely imbricate, the rhachilla ± visible between them, greenish or purplish, glabrous, obtuse at the apex; palea glabrous on the flanks, the keels slender, wingless, glabrous or scaberulous; anthers 2, 0.1–0.4 mm long.
Robust caespitose annual; culms up to 165 cm tall, erect, often branched below, glabrous at the nodes, eglandular; leaf sheaths eglandular; ligula a short but distinct membrane with fimbriate margin; leaf laminas 3–26 cm × 1–7 mm, linear, flat or with involute margins, glabrous, eglandular.