Japan Flora: Rhizomes abbreviated; culms soft, 15-40 cm. long; spikelets 2-4, broadly ovoid, 5-6 mm. long, 4-4.5 mm. wide, obtuse, light green; scales somewhat hyaline, 3 mm. long; stigmas 3; achenes 1.5 mm. long, compressed-triangular; bristles 5-6, 1!4 times as long as the achene; otherwise with the characters of the preceding species. July-Sept. Marshy places on edge of lakes or ponds in high mountains.

Honshu (n. and centr. distr.).