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YELLOW IRIS Iris pseudacorus (Iridaceae) Height to 1m. Familiar and robust perennial that grows in pond margins and marshes, and on river banks. FLOWERS are 8-10cm across and bright yellow with faint purplish veins; borne in clusters of 2-3 flowers (May-Aug). FRUITS are oblong and 3-sided. LEAVES are grey-green, sword shaped and often wrinkled. STATUS-Widespread and common throughout.