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Blue Flag

Iris Versicolor

A potent diuretic, cathartic, and emetic, blue flag was used to treat a wide range of disorders, including diseases of the blood and liver, skin diseases and rheumatism. Nowadays the plant is popular with gardeners as a flower for brightening wet sites.

The rhizomes are poisonous and should not be taken internally. Blue flag when not in bloom can be mistaken for sweet flag.

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