Decumbent, rhizomatous, dioecious. Flowering culms (7–) 10–30 (–40) cm high, many-noded. Leaves: basal sheaths glabrous; ligule a ciliolate membrane, (sometimes with longer hair tufts at sides), 0.1–0.5 mm long; blade involute or convolute, 1–8.5 cm long, 1–4 mm wide. Inflorescence a single raceme or contracted panicle, 0.5–4 cm long, with 1–15 spikelets (usually only 2–4 in the females). Spikelets lanceolate, (7–) 9–16 (–20) mm long, 6–16-flowered, with 5–13 fertile florets in the female, pale; lower glume 2–4.1 mm long; upper glume 4–5 mm long; basal lemma (4–) 5–6.4 mm long; palea equal to or slightly shorter than the lemma body, with minutely ciliolate keels, with glabrous body; female florets sometimes with 3 staminodes. Male florets with anthers 2.5–3.5 mm long, and a rudimentary ovary.
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