Japan Flora: Rhizomes hard, short, as­ cending; culms erect, 15-40 cm. long, firm, slightly thickened at base, few-leaved at base; lower leaves bladeless, the upper elongate but shorter than the culms, 1-1.5 mm. wide, stiff, glabrous; the basal sheaths coriaceous, dark brown; inflores­cence simple, the bracts 1-3, linear, the lower one slighdy longer or as long as the inflorescence; spikelets 1-5, narrowly ovoid or narrowly oblong, 7-13 mm. long, about 3 mm. thick, acute, terete, dull, dark brown or dark ferrugineous; scales very obtuse and short-mucronate, 1-nerved, whitish puberulent； achenes biconvex, dark brown, nearly smooth, 1-1.2 mm. long; stamens 3, the anthers linear, 0.8-1 mm. long. Aug.-Oct. Near seashores.

Honshu (Kadzusa, Noto Prov. and westw.), Shikoku, Kyushu. Korea, Ryukyus. pan tropic.