Agrostis capillaris

Perennial, narrow-leaved, cespitose grass.

25–100 cm high.

The stem is terete, nodose, hollow culm with continuous pith inside the nodes. The culm is erect or ascending, thin, with 2–5 nodes. The subterraneous runners are short.

The leaves are alternate, simple, sheathed and shorter than the culm. The lamina is narrow (2–4 mm), compressed and glabrous. The ligule of the second highest leaf on the culm is short (1.3 mm) and obtuse.

The inflorescence is compact when young. At flowering time, the branches of the inflorescence are straggling. The inflorescence is a purplish brown, ovoid to pyramidal panicle which is 3–10 cm long. The spikelets are small (1.5–3.5 mm), keeled, compressed and long-pedunculate spikelets. The branches of the panicle are long, delicate and almost smooth. The spikelets are single-floreted. The glumes are membraneous, nearly equally long, and longer than the lemma. The lemma is membraneous, obtuse and awnless. The palea is short, just about half of the length of the lemma. The floret is bisexual. The filament of an anther is 1–1.5 mm long.

Grain.