Japan Flora: Rhizomes thickened, short; culms few, loosely tufted, slen­der, sharply 3-angled, firm, scabrous, 40-50 cm. long, nearly always hidden under the leaf-sheaths; lower leaf-sheaths scale­like, reddish brown, the normal leaf-blades all cauline, stiff, 25-3.5 mm. wide, with slightly recurved margins, somewhat cinereous-green, the sheaths long, flecked with purplish brown, scarious in front, scabrous on the angles; spikes about 4, ap­proximate, or only the lowest one remote from the others, the terminal staminate, narrowly linear, almost equaling the adjacent one in length, about 1.5 cm. long, 1 mm. thick, brownish, the bracts leaflike, overtopping the inflorescence, sheathing; staminate scales infundibuliform, connate ventrally; pisdllate spikes cylindric, 1.5-25 cm. long, rather loosely flowered, peduncled, erect; pistillate scales ovate-deltoid, pale to partially ferrugineous, clasping the axis of the spike at base, the midrib broad, green, ending in a short recurved awn; perigynia longer than the scales, about 4 mm. long, rhomboid­ellipsoid, acutely 3-angled, faintly nerved, light green, sparsely pubescent, abruptly narrowed at both ends, the beak short, erect, 2-toothed; stigmas 3, short, slightly thickened, recurved.  May-June. Limestone mountains.

Honshu (Mount lwa- fune in Shimotsuke and Akiyoshidai in Nagato); very rare. China.