Description from Flora of China
Anisantha diandra (Roth) Tutin ex Tzvelev subsp. rigida (Roth) Tzvelev; A. rigida (Roth) Hylander; Bromus diandrus Roth subsp. rigidus (Roth) O. Bolòs, R. M. Masalles & J. Vigo; B. diandrus var. rigidus (Roth) F. Sales; B. gussonii Parlatore var. rigidus (Roth) H. Lindberg; B. madritensis Linnaeus var. rigidus (Roth) Babington ex Syme; B. rubens Linnaeus var. rigidus (Roth) Mutel; B. villosus Scopoli var. rigidus (Roth) Ascherson & Graebner; Genea rigida (Roth) Dumortier.
Annual. Culms tufted, erect, 20–70 cm tall, pubescent below inflorescence. Leaf sheaths with spreading hairs; leaf blades 10–25 cm × 4–6 mm, both surfaces densely pubescent; ligule 3–5 mm. Panicle contracted, stiffly erect, 10–25 cm; branches short, scabrid, hairy, bearing erect spikelets. Spikelets wedge-shaped, 15–30 × 7–8 mm, florets 5–7; glumes linear-lanceolate, lower glume 15–20 mm, 1-veined, upper glume 20–25 mm, 3-veined; floret callus pointed, scar elliptic; lemmas narrowly lanceolate, 20–30 × 1–1.5 mm in side view, conspicuously 7-veined, scabrid, apex 2-toothed, awned from sinus; awn 20–40 mm, straight, stiff, scabrid; palea shorter than lemma. Stamens 2, anthers ca. 1 mm. Fl. and fr. Apr–Jul. 2n = 42, 56, 70.
Bromus diandrus Roth has been recorded from Xizang, but this is most probably based on a misidentification. It is distinguished from B. rigidus by a laxer, spreading panicle and a rounded floret callus with a circular scar.
Streamsides, moist places; ca. 1000 m. Jiangxi, Taiwan [N Africa, C and SW Europe, SW Asia, Mediterranean region; introduced in America and Australia].