Japan Flora: Annual; culms loosely tufted, 20-60 cm. long; leaves 2-6 mm. wide; corymbs simple or compound, to 15 cm. long, with 3-5 rays, the bracts 4 or 5, the lower 2 or 3 longer than the inflorescence; spikelets spreading or ascending, numerous, densely 10- to 30-flowered, linear, 5-10 mm. long, 1.5-2 mm. wide, compressed, yellowish; scales broadly obovate, 1-1.5 mm. long, emarginate and minutely mucronate, the midrib green; achenes slightly shorter than the scale, obovate, 3-angled, browidsh; stigmas 3.  Cultivated fields and wastelands. 

Honshu, Shikoku, Kyushu; common. Ryukyus, Formosa, Korea, China, Indochina, Malaysia, India，Africa, and Aus­tralia.