Japan Flora: Culms 30-80 cm. long, slender, stiff; leaves 2-3 mm. wide; corymbs simple, with 0 to 4 rays, to 8 cm. long; bracts 2 or 3, the lowest one much exceeding the inflorescence; spikelets compressed, 1-2.5 cm. long, 4-5 mm, wide, broadly lanceolate, acute, divergent, pale green to yellowish brown; scales narrowly ovate, 3.5-5 mm. long, acute; achenes to 1.5 mm. long, inflated-biconvex, nearly orbicular, dark brown; stigmas 2. July-Oct.