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Iris Pseudacorus < 黄菖蒲 Huang Chang Pu >
Common Name: Yellow Flag, Yellow Iris, Water Flag
Family: Iridaceae
Binomial name: Iris Pseudacorus

Iris pseudacorus (yellow flag, yellow iris, water flag) is a species of flowering plant of the family Iridaceae. It is native to Europe, western Asia and northwest Africa. Its specific epithet, meaning "false acorus", refers to the similarity of its leaves to those of Acorus calamus (sweet flag) as they have a prominently veined mid-rib and sword-like shape. However, they are not closely related. It is an herbaceous flowering perennial plant, growing to 100–150 centimetres (39–59 in) (or a rare 2 metres (6 ft 7 in)) tall, with erect leaves up to 90 centimetres (35 in) long and 3 centimetres (1.2 in) broad. The flowers are bright yellow, 7–10 centimetres (2.8–3.9 in) across, with the typical iris form. The fruit is a dry capsule 4–7 centimetres (1.6–2.8 in) long, containing numerous pale brown seeds. I. pseudacorus grows best in very wet conditions, and is often common in wetlands, where it tolerates submersion, low pH, and anoxic soils. The plant spreads quickly, by both rhizome and water-dispersed seed. It fills a similar niche to that of Typha and often grows with it, though usually in shallower water. While it is primarily an aquatic plant, the rhizomes can survive prolonged dry conditions.

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