Perennial, with rhizomes. Culms slender, floating, 20–70 cm long when flowering, smooth, nodes glabrous. Leaf sheaths loose, keeled, glabrous, mouth with lanceolate auricles adnate to the ligule; leaf blades linear, soft, 3–5 × 0.2–0.4 cm, abaxial surface smooth, adaxial surface scabrous, base rounded, apex subacute; ligule membranous, white, glabrous, subtruncate. Inflorescence linear, 4–5 cm, composed of few spikelets; racemes erect, alternate, bearing a single spikelet (rarely 2), terminal bristle 8–24 mm. Spikelets 4.5–6.5 mm, acute; lower glume 0.5–0.7 mm, obtuse or subtruncate; upper glume as long as or slightly shorter than lower lemma, glabrous, 7–9-veined, acute; lower lemma equal to spikelet, 13-veined; anthers 3, ca. 3 mm; upper lemma ca. 2.5 mm. Fl. and fr. Sep–Oct.
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