Perennial with very short rhizome; stolons absent. Stems tufted, rigid, triquetrous, smooth, somewhat incrassate at the base which is clothed with the fibrous remains of old leaf-sheaths, 15-45(-60) cm by 1-3 mm. Leaves shining greyish green, rigid, flat or canaliculate, long-attenuate, scabrid on margins and keel, 3-6 mm wide; lower sheaths reddish to dark brown. Inflorescence simple (very rarely subcompound), usually contracted and head-like. Involucral bracts 5-10, obliquely patent to patent, much overtopping the inflorescence, the longest up to 40 cm. Rays 5-10, spreading, usually less than 1cm, rarely longer than 2 cm. Spikes broadly cylindrical to obovoid, usually attenuate towards the base, dense, with up to 80 spikelets, 1-2 cm by 8-10 mm. Spikelets obliquely erect, rarely more spreading, oblong-linear, subterete also in fruit, (1-)2-3(-4)-flowered, falling off as a whole, 3-5(-7) by 1-1¼ mm; rachilla broadly winged; wings hyaline, tightly clasping the nut, c. ½ mm wide; internodes 1½-2 mm. Glumes subchartaceous, appressed, elliptic, rather obtuse, muticous or minutely mucronulate, ⅓ imbricate, with green, 3-nerved keel and brownish green to fuscous, 3-4-nerved sides, 3-4 by 1¾-2 mm. Stamens 3; anthers linear, 1-1½ mm. Stigmas 3, longer than the style. Nut trigonous, ellipsoid or oblong-ellipsoid, slightly curved, shortly apiculate, brown, (1.8-)2-2½ by 3/5-9/10 mm.
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Perennials. Rhizomes short. Culms scattered, 15-70 cm tall, slightly stout, acutely triquetrous, smooth, base many leaved. Leaves shorter than culm; sheath purplish red; leaf blade 5-7 mm wide, slightly flaccid or stiff, folded at basal part and spreading at apical part, abaxially midvein and margin scabrous. Involucral bracts 6-10, leaflike, longer to slightly shorter than inflorescence, margin scabrous. Inflorescence a simple anthela; rays 6-10, short or to 4.5 cm, unequal in length, with a single spike at apex. Spikes oblong-obovoid, often appearing to taper toward base or rarely cylindric, 1-1.8[-3] × 0.8-1.2 cm, with many densely arranged spikelets, base cuneate to subtruncate. Spikelets erect to erect-spreading, narrowly linear-ovoid to linear-oblong, 4-6.5 × ca. 1 mm, each (1 or)2-4-flowered; rachilla wings lanceolate, broad. Glumes crowded, brownish to purplish red on both surfaces, elliptic, ca. 3.5 mm, papery, veins several with middle 3 conspicuous and green, keeled, apex obtuse to acute and not mucronate. Stamens 3; anthers broadly linear, 1-1.5 mm; connective prominent beyond anthers. Style of medium length; stigmas 3. Nutlet dark grayish brown, narrowly oblong, 2-2.5 × 0.6-0.9 mm, ca. 2/3 as long as subtending glume, 3-sided, slightly curved in dorsiventral view, with dense punctate processes. Fl. and fr. Apr-Sep.
In open or partly shaded, somewhat moist to rather dry localities: secondary forests, old clearings, road-sides, river-banks, etc., at low and medium altitudes (0-1300 m); on Mt Tengger (E. Java) up to 2100 m, on Mt Rindjani (Lombok) up to 2000 m.
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