单蕊草 dan rui cao

Agrostis latifolia Treviranus ex Göppert, Beschr. Bot. Gaert. Breslau 82. 1830.

Culms solitary or loosely tufted, 0.6–1.6 m tall, 2–3 mm in diam., smooth or scabrid below nodes, 7–9-noded. Leaf sheaths scabrid; leaf blades broadly linear, 15–30 cm, 10–15 mm wide, both surfaces and margin scabrid; ligule 3–6 mm. Panicle droop-ing, 15–40 cm; branches slender, 3–6 per node, up to 10 cm, ascending or spreading with spikelets in clusters along branchlets, scabrid. Spikelets 2.5–4 mm, green; glumes subequal, narrowly lanceolate, lower glume 1-veined, upper glume 1–3-veined; floret raised on 0.1–0.5 mm stipe; lemma oblong-lanceolate, 2.5–3.8 mm, 3(–5)-veined, scabrid; awnlet 0.2–1(–2) mm. Anthers 0.6–0.8 mm. Caryopsis ca. 2 mm. Fl. and fr. Jul–Sep. 2n = 28.

Damp places in woodlands, thickets, along riversides. Heilongjiang, Jilin [Japan, Korea, Mongolia, Russia; N Europe, North America].