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Perennial, tufted, stoloniferous; stolons slender, leafy, widely spreading, developing after anthesis. Culms erect or geniculate and rooting at base, 30–50(–100) cm tall. Leaf sheaths smooth; leaf blades linear, flat or inrolled, 4–10 cm × 2–5 mm, scaberulous, apex acute to acuminate; ligule on non-flowering shoots 2–3.5 mm, rounded to truncate, often lacerate. Panicle narrow, linear to lanceolate in outline, 5–20 cm, open only at anthesis, otherwise contracted, often dense; branches several per node, closely divided, ascending, scabrous, main branch at a node often bare in lower 1/3, but accompanied by shorter branches bearing spikelets to base. Spikelets 1.8–3 mm, yellowish green; glumes lanceolate, subequal or lower glume slightly longer, lower glume scabrous along keel distally, upper glume often smooth, apex acute; callus minutely hairy; lemma 3/4 as long to subequaling spikelet, usually awnless, apex rounded; palea 1/2–3/4 length of lemma. Anthers 0.8–1.5 mm. Fl. Aug.
Erect or ascending stoloniferous perennial, occasionally shortly rhizomatous. Culms to 40 cm high, 2–4-noded; mid-culm internodes smooth. Leaves scattered; ligule 1–7 mm long, obtuse, erose or laciniate; blade flat, linear, to 18 cm long, 0.5–5 mm wide. Panicles open at anthesis and contracted afterwards, to 21 cm long, exserted; primary branches alternate in groups of 1–6, spreading, rarely more than 3 cm long, shorter ones bearing spikelets almost to base. Spikelets densely clustered, 2–3 mm long. Glumes equal or subequal, 2–3 mm long. Lemma ovate, 1.5–2 mm long, usually muticous or more rarely awned, obscurely 5-nerved, glabrous; awn shorter than lemma body, subapical. Palea 50–65% length of lemma. Anthers 1–1.5 mm long.
Much like no. 2 [Agrostis gigantea Roth], and perhaps not sharply distinct, but not rhizomatous, though sometimes with stolons; panicle greenish or stramineous, seldom over 10 cm, narrower, especially after anthesis, with ascending or erect branches; 2n=28–46. Native of Europe, cult. and intr. as in no. 2. Two confluent vars.
A tufted grass. It has stolons and keep growing from year to year. It grows 15-100 cm high. The leaf blades are 1-10 cm long and 1-5 mm wide. The flower panicle is narrow. It is 1-13 cm long.
