Japan Flora: culms 5-15 cm. long, slender; leaves and leaf-sheaths hairy; spikelets lanceolate, 3-7 mm. long, 1-1.5 mm. across, acute; scales oblong or ovate, to 1.5 mm. long, brownish, obtuse and mucronate; achenes obovate, 0.6 mm. long, lustrous, smooth, stramineous; style-base often puberulent but not long-hairy; stamen 1, the anther small, 0.2-03 mm. long. Aug.-Oct.
Honshu; rare. Amur, Formosa, China, Indochina, India, Malaysia, and tropical Australia.