Coarse, glabrous. Rhizome erect, woody, emitting horizontal, thick stolons clothed with 3-ranked, striate, ovate-lanceolate scales. Stems stout, striate, smooth, 80-200 cm tall. Leaves about as long as the stems, rigid, tough, complicate at the base, spinuloseserrulate on the margins and keel, 6-12 mm wide, gradually narrowed into a long triquetrous acumen with sharply cutting edges; sheaths yellowish to ferrugineous, brown at the base. Panicle decompound, oblong, interrupted, 30-50 cm long; branches exserted from the sheaths, erect, compressed, much branched. Lower bracts similar to the leaves, longer than the partial inflorescences in their axils. Spikelets in globose clusters, young oblong-lanceolate, ripe ovoid or ellipsoid, acutish, 3-4 by 1½-2 mm. Glumes 5-7, membranous, obtuse, concave, 1-nerved, ferrugineous to brown, darker lineolate, the upper ones 2-4 mm long, the lower empty ones smaller, broadly ovate. Anthers 2-3 mm long. Nut terete, acute or acuminate, smooth or more or less rugulose, brown to dark castaneous, 2-4 by 1.2-2 mm, the hypogynous disc with the filaments often persisting on the rachilla.
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A sedge. These grow in clumps and have grass like leaves and solid stalks. It grows about 1 m tall. It is a herb. It has an underground stem or rhizome and leaves arranged in a spiral.
Stout perennial to nearly 3 m. Spikelets brown.
In swamps and pools, on margins of lakes, sometimes in swampy forests, from a few m altitude up to 2100 m (in New Guinea), in Sumatra at 900 m, in Timor at 400 m.
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It grows in temperate and tropical regions worldwide. It grows on the edges of lakes, swamps and pools.
Reed swamps and fens, often forming dense pure stands, usually on neutral or alkaline soils.
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