沿沟草(原变种) yan gou cao (yuan bian zhong)

Aira aquatica Linnaeus, Sp. Pl. 1: 64. 1753; Glyceria aquatica (Linnaeus) J. Presl & C. Presl; Poa airoides Koeler.

Culms 20–70 cm tall, creeping and spreading. Leaf blades 5–20 cm × 4–8 mm. Panicle loose, open; branches slender, 2–6 cm, obliquely ascending or rarely horizontal. Lemma 2–3 mm. Fl. and fr. Apr–Aug.

Shallow water of river and streamsides, pond margins; 800–4000 m. Gansu, Guizhou, Hebei, Hubei, Nei Mongol, Qinghai, Sichuan, Xinjiang, Xizang, Yunnan [Afghanistan, Kashmir, Kazakhstan, Kyrgyzstan, Mongolia, Pakistan, Russia, Tajikistan, Turkmenistan; SW Asia, Europe, North America].