Japan Flora: Rhi­zomes very short; stems tufted, 25-40 cm. long, strongly com­pressed, broadly 2-winged; leaves caulinc, few, linear-ensiform, compressed, shorter than the inflorescence, 4-6 mm. long, gradually attenuate to an acute tip, pluritubulose, the septa distinct; inflorescence of rather numerous 4- to 7-flowercd heads, terminal, the lowest bract leaflike, much shorter than the inflorescence; flowers 4-5 mm. long when mature, peri­anth-segments equal in length or the inner slightly longer than the outer, lanceolate, cuspidate, greenish; stamens 6, 2/3 as long as the perianth, the anthers much shorter than the filaments, oblong; capsules elongate, conical-ovoid, exceeding the perianth, reddish brown, lustrous, rather thick; seeds obovoid, 0.5 mm. long. June-Sept. Wet places.

Honshu, Shikoku, Kyushu. China.