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Iris pseudacorus, the yellow flag, yellow iris, or water flag, is a species of flowering plant in the family Iridaceae. It is native to Europe, western Asia and northwest Africa. Its specific epithet "pseudacorus" means "false acorus", referring 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, the two plants are not closely related.