Perennial, with short rhizome and long, slender stolons. Stems erect, tufted, slender, sharply and unequally 4-5-angled, smooth, not transversely septate, (10-)30-50 cm by c. 2 mm. Sheaths thin, rather loose at the apex, purple at the base. Spikelet linear, scarcely if at all broader than the stem, angular, acute, many-flowered, dusky green, 2-6 cm by 2-3 mm. Glumes firm, almost in 4 rows, rather loosely imbricate, subsquarrose, more or less convolute when dry, oblong-ovate, obtuse, rather prom-inently keeled, many-nerved, more or less distinctly brown-zonate within the narrow scarious margins, 4-5 by 2-2½ mm. Bristles 6-7, rather coarse, unequal (the inner ones distinctly longer than the outer ones), from less than half as long as the nut proper to slightly longer than the nut together with the style-base, retrorsely scabrous, brown. Stamens 3; anthers linear, 1-1.5 mm. Stigmas 2-3. Nut turgidly biconvex with slightly ribbed margins, obovate, somewhat pyriform, slightly narrowed into a distinct neck which is upwards outwardly curved into a prominent annulus, stramineous to fuscous, 1½-1¾ by c. 1¼ mm; epidermal cells in 15-20 regular vertical series on either face, hexagonal, deeply pitted. Style-base deltoid, flattened, c. ½-⅔ as long and ⅔-¾ as wide as the nut.
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Perennials. Stolons slender. Culms erect, brown, tufted, 30-50 cm tall, 1.5-2.5 mm thick, acutely 4-or 5-angled. Leaf sheaths 2 or 3, reddish brown to dark brown, tubular, 2-8 cm, mouth obliquely truncate, apex acute. Spikelet cylindric, 1.5-4 cm × 2.5-3 mm. Basalmost glume empty; fertile glumes brownish green, laxly spiraled and in 4 rows, broadly lanceolate, 4-5 × 1.5-2.5 mm, membranous, abaxially purplish red puncticulate medially, many veined and with a slightly conspicuous midvein, margin hyaline, apex obtuse to slightly acute. Perianth bristles 7, 3 on outer series as long as nutlet, 4 on inner series as long as style base, retrorsely spinulose. Stigmas 2. Nutlet yellowish brown, obovoid, 1.5-2 × 1-1.2 mm, biconvex, deeply pitted with 15-20 longitudinal rows of hexagonal epidermal cells, apex slightly constricted into a short neck and with a slightly annular thickening; persistent style base long pyramidal, apex attenuate. Fl. and fr. Sep-Oct.
On open marshy ground, in wet rice-fields, in P. Jamdena in Melaleuca-forest surrounded by primary forest; at low altitude, up to 400 m.
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