3. Brachypodium pinnatum (Linnaeus) P. Beauvois, Ess. Agrostogr. 155. 1812.
羽状短柄草 yu zhuang duan bing cao
Bromus pinnatus Linnaeus, Sp. Pl. 1: 78. 1753; Agropyron pinnatum (Linnaeus) Chevallier.
Perennial with widely spreading slender rhizomes. Culms tufted, 30–40(–120) cm tall, unbranched, 3–8-noded. Leaf sheaths glabrous or pubescent; leaf blades linear, flat, pale green, 5–15(–40) cm, 3–8 mm wide, pubescent or scabrous on both surfaces; ligule 1.5–2.5 mm, margin ciliate. Raceme 5–20 cm, usually erect, spikelets 4–15; pedicels 1–2 mm. Spikelets 1.8–4 cm, subterete, florets 8–24; glumes lanceolate or oblong-lanceolate, 3–6-veined, glabrous or thinly pubescent, acute, lower glume 3–5(–6) mm, upper glume 5–7(–8) mm; lemmas oblong-lanceolate, 7–11 mm, pubescent above middle and near margins, prominently 7-veined; awn 1–6 mm. Anthers 3–3.5(–5) mm.
Grassy mountainsides. Nei Mongol, Shanxi, W Xizang, Yunnan (Zhaotong, Huize) [Kazakhstan, Kyrgyzstan, Mongolia, Russia; N Africa, SW Asia, Europe; introduced in North America].