Japan Flora: Culms 50-100 cm. long, slender, erect from ascending to short-creep­ing base, smooth; leaf-blades linear, 10-20 cm. long, 1-2 mm. wide; ligules 3-5 mm. long, obtuse; panicles erect, 12-25 cm. long, very loose and open, ovate, the branches subverticillate, scabrous, spreading; spikelets 2- or 3-flowered, ovate, 3-5 mm. long, acute, pale green; glumes laiweolate, 2-2.5 mm. long, acute, 3-nerved, with a scabrous keel; lemmas acute, often bronzed toward margin, 2.5-3 mm. long, glabrous, the keel and marginal nerves pubescent on lower 1/3-1/2 of the entire length; anthers 1-1.5 mm. long. May-June. Naturalized. 

Hokkaido, Honshu (centr. distr. and northw.). Cooler re­gions of the N. Hemisphere.