Japan Flora: Rhizomes elongate; culms 60- 100 cm. long, smooth, nearly terete, 1-leaved near the middle; leaves radical, fascicled, smooth, linear, 3-4 mm. across, gradu­ally narrowed to the obtuse apex, somewhat cinereous; cauline leaves sheathlike, 10-15 cm. long, with a subulate apex; in­florescences 3-5} loosely disposed in slender compound pan­icles, bearing fascicles of 5-8 spikelets, the bracts nearly blade- less; spikelet 5-6 mm. long, red-brown, 6- to 7-flowered; achenes oblong, obtusely 3-angled, glabrous, with a densely hairy style-base June-Oct. Wet places.

Honshu (Tokaido and westw.), Shikoku, Kyushu. Ryukyus and (?) China.