Common name: yellow flag, water flag, yellow iris. Scientific name: Iris pseudacorus. Family: Iridaceae. Genus: Iris. Species: pseudacorus.

Iris pseudacorus is a herbaceous perennial plant in the Iridaceae family. It is growing to 4-6 ft. (1.2-1.8 m) tall. The leaves are grayish green, sword shaped, 90 cm -150 cm long and 3 cm broad. The flowers are bright yellow.