Japan Flora: Culms slender, 20-40 cm. long; leaves shorter than the culms, 1-2 mm. wide, slightly setulose-scabrous, abruptly pointed at apex; inflorescence usu­ally compound, with rather many loosely disposed nearly sim­ple spikelets, the bracts setaceous, to 5 cm. long; spikelets lanceolate, 7-10 mm. long, 2-2.5 mm. thick, compressed, dull, dark brown, subacute, 3- to 8-flowered; scales few, 2-ranked, keeled, the lower 2 or 3 small, empty, the middle ones 4-5 mm. long, gradually narrowed to apex, minutely puberulent; achenes broadly obovoid, 1 mm. long, 3-angled, whitish, verruculose; anthers linear, about 1.5 mm. long. Sep-Oct. 

Shikoku, Kyushu; rare. China, India, and Malaysia.