Small annual with fibrous, yellowish roots. Stems tufted, trigonous, smooth, 2-15 cm by ⅓-1 mm. Leaves very narrow, often setaceous, gradually acuminate, rigid, scaberulous in the upper part, ½-1 mm wide; sheaths membranous, striate, reddish brown. Inflorescence simple, often reduced to a single head. Involucral bracts 3-4(-6), patent, the longer ones overtopping the inflorescence. Rays 0-4, filiform, obliquely erect to spreading, smooth, up to 3 cm. Spikelets digitately arranged, stellately spreading, in clusters of up to 20, linear, strongly compressed, up to 40(-60)-flowered, ½-1½(-2) cm by (2-)2½-3 mm (mucros included); rachilla slightly flexuous, wingless, persistent; internodes c. ⅓ mm. Glumes subchartaceous, finally obliquely patent, oblong-spatulate, ½ imbricate, the body strongly 3-nerved, emarginate at apex, with green, often purplish lineolate keel and nerveless, ferrugineous to castaneous sides, 1-1½ by ½-1 mm, the strong mucro spreading to recurved, ⅔-1 mm. Stamens (2-)3; anthers elliptic, ¼-⅓ mm. Stigmas 3. Nut trigonous, obovoid to oblong-obovoid, about half as long as the subtending glume, shortly apiculate, brown to castaneous, (½-)⅔-¾ by ⅓-2/5 mm.
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A slender, annual herb, up to 150 mm tall. Inflorescence a single spikelet-cluster of 4-20 spikelets. Spikelets in digitate clusters. Glumes 1.6-2.0 mm long, reddish brown.
In open, moist to rather dry localities, on sandy arable fields with previous soil, sometimes a weed in rice-fields, 0-1100 m.
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