8. Bromus sibiricus Drobow, Trudy Bot. Muz. Imp. Akad. Nauk. 12: 229. 1914.
西伯利亚雀麦 xi bo li ya que mai
Bromus inermis Leysser var. sibiricus (Drobow) Krylov.
Perennial, with creeping stolons, base brown, covered by dry leaf sheaths. Plants 20–100 cm tall, nodes pubescent. Leaf sheaths smooth, glabrous; leaf blades flat, ca. 15 cm, scabrid, glabrous or scattered pubescent; ligule ca. 0.5 mm. Panicle 8–15(–20) cm, erect, narrow, contracted, sometimes nodding; branches shorter than spikelets, each bearing 1 or 2 spikelets. Spikelets narrowly oblong, 15–25 mm, purple, florets 4–8; rachilla thinly hairy; glumes glabrous, lower glume 6–8 mm, 1- or 3-veined, upper glume 7–10 mm, 3-veined; lemmas lanceolate, 10–12 mm, 5–7-veined, marginal veins densely pubescent to middle or slightly above, midrib and intermediate veins pubescent or scabrid; awn 1–5 mm; palea shorter than lemma, keels ciliate. Anthers 2–4 mm. Fl. and fr. Jun–Aug.
Plains, grassy places; 500–1000 m. Hebei, Heilongjiang, Nei Mongol [Mongolia, Russia (Siberia); Europe].
It is difficult to distinguish Bromus sibiricus from B. inermis, and the former species could well be merely a dwarf form of the latter.