Annual with fibrous roots. Stems tufted, com-pressed-trigonous, smooth, often slightly pubescent at the top, leafy at the base, (2-)15-30(-40) cm by ½-1 mm. Leaves ½-⅓ as long as the stems, often curved, flat, rather abruptly acuminate, glabrous, or pubescent beneath, often ciliate on the margins, scabrid in the upper part, 1-2 mm wide; ligule a dense fringe of short hairs. Inflorescence simple or compound, loose, diffuse, with several spikelets but sometimes reduced to a single spikelet, up to 5(-10)cm long and wide. Involucral bracts 1-3, shorter than the inflorescence, often ciliate-puberulous at the dilated base, 1-3(-6) cm long. Primary rays up to 8, obliquely patent, glabrous and smooth, 1-4(-8)cm. Spikelets solitary, ovoid or oblong-ovoid, terete, acute, densely few-to several-flowered, 3-5(-7) by 1½-2 mm; rachilla narrowly winged. Glumes spiral, appressed, subchartaceous, broadly ovate, rather acute, muticous or apiculate, slightly keeled, glabrous, with 3-nerved keel, nerve-less shining rufous sides, and hardly hyaline margins, (1⅓-)1½-2 by c.1½. Stamens 1(-2); anthers oblong, ⅓-½ mm. Style slender, flat, not or hardly hyaline-margined, glabrous or with 1-4 short cilia at the very top, ¾-1 mm; stigmas 2, shorter than the style. Nut biconvex, obovate or broadly obovate, shortly stipitate, minutely umbonulate, sometimes sparsely verruculose, conspicuously trabeculate by the impressed, transversely oblong epidermal cells in 5-6(-9) vertical rows on either face, 3/5-¾(-9/10) by ½-7/10 mm.
In swamps, wet rice-fields, grass-fields, teak-forests, at low altitudes (0-300 m), in Atjeh at 800-1000 m.
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