Japan Flora: Small erect tufted an­nual; culms 5-30 cm. long, simple or branching at base, genic­ulate and ascending at base, glabrous; leaf-blades flat or with loosely involute margins, narrowly lanceolate, 4-10 cm. long, 1-5 mm. wide, spreading, papillose-pilose toward the base, long-ciliate, the cilia callose at base; ligules a series of dense, short hairs; panicles erect, linear, 3-7 cm. long, about 5 mm. wide, the branches erect, short, glabrous, rather thick; spike­lets 2-2.2 mm. long, at first broadly lanceolate, becoming ovoid in maturity, lustrous, deep-brown; first glume about 1.5 mm. long, acute, involute, the second slightly shorter than the floret, narrowly ovate; lemma ovate to narrowly so, obtuse; stamens 3, the anthers elliptic, about 0.3 mm. long; caryopsis ovoid, 2/3-S/4 as long as the lemma. Aug.-Oct. Wet places.

Honshu, Shikoku, Kyushu; rather common. China.