Japan Flora: Rhizomes elongate, the sterile inno­vations elongate; culms 40-100 cm. long, stout; leaves on the upper 2/3 of the culm, flat, rather firm, deep green, 5/8 mm. wide; basal sheaths bladeless, rusty-brown; heads 5-8, in an interrupted spike, globose, 1.5 cm. across, with numerous ses­sile spikelets; lower bracts leaflike, sheathless; spikelets lanceo­late-ovoid, lustrous, acuminate, 6-7 mm. long, 1-flowered, red­dish stramineous; achenes broadly obovate, shining, 2 mm. long, smooth and often minutely wrinkled, the beak slender, the style slender, the stigmas 2 mm. long, 2-cleft; bristles 6, smooth, twice as long as the achene.  Sept.-Oct. Marshy places.

Honshu (Tokaido, Kinki Distr.), Kyushu; rare. Ryukyus, Formosa, and Malaysia.