Annuals or perennials, erect, decumbent or geniculate, with or without stolons. Flowering culms 25–40 (–60) cm high. Leaves glabrous; ligule c. 0.5 mm long; blade 5–10 cm long, acuminate. Inflorescence branches 3–6, persistent, 4–9 cm long, with axis triquetrous to flattened. Spikelets elliptic or obovate (asymmetric), 1.5–2.5 mm long. Glumes 1.5–2.5 mm long, acute or obtuse, carinate, with keel wingless but acute, scaberulous on nerve. Callus blunt. Lemma 1.2–1.5 mm long, muticous, pubescent on the nerves for their entire length and between the nerves in a longitudinal patch. Palea keels well separated and pubescent for most of the length. Caryopsis elliptic or obovate, not compressed, c. 1 mm long, smooth, glossy or dull; embryo ±half as long as caryopsis.
In swampy areas and flood plains bothinland and near the coast, sometimes in water, usually on heavy soils, withother grasses, occasionally in woodland.
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