Japan Flora: Culms erect, 37-45 cm. long, obtusely angled, glabrous, about 2.5 mm. thick, nearly always hidden under the leaf-sheaths; lower leaf-sheaths bladeless, dark sanguineous purple, the normal leaves densely aggregated on the apical part of the culm, the blades spreading, 10-20 cm. long, 8-13 nun. wide, the sheaths loosely surrounding the culm, hispidulous on the angles, the ligules glabrous, ferrugineous, about 2 mm. long; spikes 8-10, forming a capitate inflorescence, the terminal staminate, linear, to 2 cm. long, tawny, the others pistillate, cylindric, 25-30 mm. long, 3-3.5 mm. thick, densely many­flowered; pistillate seal效 rather small, ovate-elliptic, cuspidate, membranous, ferrugineous and flecked with dark brown, hya­line toward the margins; perigynia much longer than the scales, 2.8-3 mm. long, obliquely spreading, ellipsoidal or ovoid-ellipsoidal, obtusely 3-angled, thick-membranous, fer­rugineous, almost nerveless; costal nerves 2, densely whitish setulose, abruptly rather long-beaked, minutely 2-toothed; stigmas 3. 

Cultivated in Honshu (Mikawa Prov.), Kyushu (Chikugo Prov.); rare. China.