Japan Flora: Flac­cid green annual; culms tufted, erect, obtusely 3-angled, smooth; leaves 1-2 mm. wide, often filiform; head solitary, small, 5-8 mm. across, deltoid, usually composed of 3 spikelets, the bracts 2, divergent to reflexed, leaflike; spikelets ovoid-oblanceolate, 1-1.3 mm. long, pale green, sometimes brown-flecked, with an apical recurved short awn-like mucro; achenes 1 mm. long, lanceolate, obtusely angled, light yellow, covered by 2 hyaline scales; stigmas 3. Aug.-Oct. Wet places and waste grounds in lowlands.

Honshu, Shikoku, Kyu­shu.  Korea, Northeast China, China, Formosa, India, Malaysia, and Australia.