Japan Flora: Tufted annual; culms numerous, erect, 5-30 cm. long, filiform, glabrous, longi­tudinally several-ribbed, leafy only at base; leaves much shorter than the culm, filiform, glabrous, narrower than the culm; sheaths 5-20 mm, long, ferrugineous, glabrous, with few long white hairs on the mouth; inflorescence a dense head of 2니5 sessile spikelets, 5-12 mm. across, with few filiform bracts at base longer than the inflorescence; spikelets lanceo­late, angled, 3-8 mm. long, 2 mm. thick; scales ovate, about 2 mm. long, with a recurved short awn; achenes obovate-orbicu­lar, pale, smooth, 0.6-0.7 mm. long; style-base minute, de­pressed.- Aug.-Oct. Abundant in waste grounds and culti­vated fields.

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