Japan Flora: Rather large tufted annual; culms 40-100 cm. long, branched, glabrous, erect from an ascending base; leaf-blades linear, 20- 40 cm. long, 8-15 mm. wide, flat or sometimes with loosely involute margins, glabrous; ligule a series of short hairs; sheaths glabrous, often somewhat purplish; panicles rather spherical, the branches spreading, rather slender, elongate, scabrous; spikelets loosely arranged, on rather long pedicels, ovate-oblong, acute, slighdy compressed, about 2.5 mm. long, pale green, often purplish, glabrous; first glume truncate or obtuse, 1/5-1/4 as long as the spikelet, the second and sterile lemma longer, acute, 5- to 7-nerved, membranous; fertile lemma oblong, rather obtuse, smooth, lustrous, 1.7-2 mm. long. Sept.-Oct.

Naturalized in waste grounds; Honshu. N. America.