Glabrous perennial with very short woody rhizome. Stems solitary or somewhat tufted, obtusely trigonous or quadrangular, more or less compressed, smooth, many-leaved at the base, 30-80 cm by ¾-2 mm. Leaves shorter than to as long as the stems. flat, rather rigid, gradually narrowed to the rather abruptly acuminate tip, serrulate-scabrous on the margins in the upper part, 2-4 mm wide; ligule a dense fringe of short hairs; sheaths rounded on the back. Inflorescence compound to supradecompound, loose, with many spikelets, 5-15 cm across. Involucral bracts 2-4, erect, scariously margined at the base, the lowest half as long as to longer than the inflorescence. Primary rays 8-12, erecto-patent, compressed, smooth, up to 7 cm. Spikelets solitary, oblong-ovoid to oblong-lanceolate, angular, acute, 8-15-flowered, castaneous, 5-8 by 2-2½ mm; rachilla winged. Glumes spiral, chartaceous, ovate-lanceolate, acute, mucronulate or apiculate just below the apex, with 7-9-nerved keel and pale membranous margins, 3-4 by 2-2½ mm. Stamens 3; anthers linear, 1½-2 mm. Style triquetrous, glab-rous, abruptly thickened at the base, 1¾-2 mm; Style-base sometimes more or less persistent on the nut; stigmas 3, about as long as the style. Nut trigonous with slightly concave sides, obovoid, obtuse to subtruncate at the apex, shortly stipitate, um-bonulate, verrucose especially near the angles, whitish or stramineous, 1¼-1½ by 9/10-1.2 mm; epidermal cells hexagonal to transversely elliptic.
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Perennials. Rhizomes short. Culms tufted, (11-)25-70 cm tall, flatly and obtusely 3-angled, striate, with many leaves at base. Leaves slightly shorter than culms to 1/4-1/2 as long as culm; sheaths brown, abaxially membranous and rust-colored, apex truncate; leaf blade 2-4.5 mm wide, flat, stiff, margin finely toothed, apex acute. Involucral bracts 2 or 3, leaflike, much shorter than inflorescence; bractlets subulate, broader at base. Inflorescence a compound or decompound anthela; rays 2-4, 0.7-3.5 cm, slightly compressed. Spikelets solitary, oblong-ovoid to ellipsoid, 5-10 × 2-3 mm, 7-10-flowered or more, apex acute. Glumes chestnut-brown, ovate, 2.2-3.5 mm, 5-7-veined forming an abaxial obtuse keel, midvein green and excurrent into a mucro, margin membranous, apex acute. Stamens 3; anthers narrowly oblong, ca. 2 mm, ca. 2 × as long as filaments. Ovary oblong, nearly 3-sided, base slightly narrowed; style 3-sided, not ciliate, basally inflated to oblong-conic; stigmas 3, slightly longer than style. Nutlet yellowish white to yellow, obovoid, ca. 2 mm, obtusely 3-sided, with transversely oblong reticulation and verrucae. Fl. and fr. May-Jun.
In moist to swampy grassy localities, 800-1400 m (Sumatra), on dry open slopes bordering thickets, at low altitude (Palawan).
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