Japan Flora: Erect perennial with short rigid rhizomes and small, ovoid, rather flattened, rigid innovation-buds covered at base with few, yellowish, lustrous scales; culms 40-100 cm. long, smooth, sometimes with a cleistogamous inflorescence within the upper sheath; leaf-blades flat or with loosely in­volute margins, somewhat spreading, linear, 4-10 cm. long, 1-6(-10) mm. wide, gradually acute, sometimes with a few long hairs on both sides; sheaths short, sparsely long-hairy near the mouth and on upper margin; ligules very short, minutely ciliate; panicles 4-8 cm. long, more or less one-sided, with 2 or 3 nearly simple, ascending branches; pedicels short, ap­pressed to the branches; spikelets narrowly lanceolate, 2- to sometimes 1-flowered, lead-green with reddish purple mark­ings; glumes unequal, membranous, 1-nerved, the first nar­rowly ovate, obtuse, about 1 mm. long, the second broadly lanceolate, acute, 1.5-2 mm. long; lemmas lanceolate, 4-5 mm. long, with a slender awn 2-4 mm. long in cleistogamous florets, the awn longer than the lemma; anthers 1.5-2 mm. long in chasmogamic florets. Aug.-Oct.

Honshu, Shi­koku, Kyushu. Korea and China, Ussuri, and Mongolia