Description from Flora of China
Arundo neglecta Ehrhart, Beitr. Naturk. 6: 137. 1791; Calamagrostis micrantha Kearney; C. neglecta (Ehrhart) Gaertner; Deyeuxia micrantha (Kearney) L. Liu.
Perennial, tufted. Culms erect, 60–100 cm tall, 1–3 mm in diam., smooth or slightly scabrid below panicle, usually 2–3-noded. Leaf sheaths smooth, glabrous; leaf blades flat or involute, 10–30(–60) cm, 1–5 mm wide, adaxial surface scabrid with obvious veins, abaxial surface smooth; ligule 1.5–4 mm, obtuse or truncate, denticulate. Panicle dense, interrupted, lanceolate to narrowly ovate in outline, 5–20 × 2–4 cm, axis smooth or scabrid; branches short, fascicled, scabrid. Spikelets 3–4(–4.5) mm, pale green to purplish brown; glumes narrowly ovate, subequal, lower glume 1-veined, upper glume 3-veined, prominently scabrid throughout, apex acute; callus hairs 2/3–3/4 length of lemma; lemma 2.5–3.5 mm, apex obtuse, denticulate; awn arising near or below middle of lemma, poorly developed, 1–2 mm, straight; palea 2/3 as long as lemma; rachilla ca. 2 mm, including hairs up to 3.5 mm. Anthers ca. 2 mm. Fl. and fr. Aug–Sep. 2n = 42*.
This is a widespread, highly polymorphic species, to which the name Deyeuxia kashmeriana Bor has been misapplied (by Liou, Vasc. Pl. Hengduan Mts. 2: 2241. 1994). Deyeuxia kashmeriana is a synonym of Calamagrostis decora J. D. Hooker from Kashmir, which has slightly larger spikelets and a longer, sub-basal awn.
Grassy places in forests, damp ground near ditches; 1200–4300 m. Gansu, Hebei, Heilongjiang, Liaoning, Nei Mongol, Shanxi, Sichuan, Xinjiang [Japan, Kyrgyzstan, Mongolia, Russia, Tajikistan; Europe, North America].