7. Bromus pumpellianus Scribner, Bull. Torrey Bot. Club. 15: 9. 1888.
紧穗雀麦 jin sui que mai
Bromopsis pumpelliana (Scribner) Holub; Bromus inermis (Leysser) Holub subsp. pumpellianus (Scribner) Wagnon; B. uralensis Govoruchin; Zerna pumpelliana (Scribner) Tzvelev.
Perennial, with creeping stolons. Culms erect, 60–120 cm tall, 4–6-noded, with dense, reflexed hairs. Leaf sheaths glabrous or sparsely reflexed pubescent; leaf blades ca. 15 cm × 6–7 mm, adaxial surface sparsely pubescent, abaxial surface and margin scabrid; ligule ca. 1 mm, apex erose. Panicle spreading, ca. 20 cm; branches 2–4 per node, 2–6 cm, each bearing 1 or 2 spikelets. Spikelets 25–40 × 5–8 mm wide, florets 9–13; rachilla internodes 2–2.5 mm, pubescent or spinulose; lower glume 7–9 mm, 1-veined, upper glume 9–11 mm, 3-veined, margins membranous, apex acuminate; lemmas lanceolate, 10–14 × ca. 1.5 mm in side view, 7-veined, intermediate and marginal veins short or inconspicuous, margins membranous, keel and margins often proximally stiffly pubescent, hairs 1–2 mm, awned from apex; awn 2–5 mm; palea slightly shorter than lemma, keels stiffly ciliate. Anthers 4–6 mm. Fl. and fr. Jun–Aug. 2n = 28.
Mid-mountain meadows, thickets, grassy areas in river valleys; 1000–2500 m. Heilongjiang, Nei Mongol, Shanxi [Russia; W North America].
The stiff hairs of the spikelets are the only consistent and easily interpreted character by which this species can be separated from Bro-mus inermis. However, this is generally not a very reliable character in Bromus.
This species has been incorrectly named Bromus richardsonii Link by some authors.