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Rhizomes subterranean, somewhat rough, dark brown to black, 6-8-sectored, vascular bundles each surrounded by an endodermis. Stems monomorphic, smooth, irregularly branched, evergreen, solitary to caespitose, 45-300(-900) cm tall, 2-5 mm in diam., with 10-32 ridges; branches solitary or in groups of 2-3(-5), up to 60 cm long, straight or sinuous, simple or occasionally secondarily branched. Sheaths green, cylindrical to slightly funnel-shaped, 4.5-13 mm long, 2-12 mm wide; segments smooth, the midrib prominently vaulted and ridged basally, sometimes becoming flattened apically, with two distinct lateral ridges; teeth with central brown band and broad, white or colourless margins, often deciduous. Branches 6-10-angled, with sheaths like those of the stem, or with persistent teeth. Strobilus yellow to black, nearly obtuse to apiculate, up to 25 mm long, 7 mm wide, with the apiculum up to 1 mm long.
A herb. The rhizome can be erect or creeping. The stem can be 60 cm tall.
