Iris versicolor (Iridaceae)
BLUE FLAG, LIVER LILY, SNAKE LILY
Learned of from North American
Indians, the rhizome of blue flag is given by herbalists for biliousness and
The American pharmacopoeia used to include this plant,
a remedy for stomach complaints learned of from the North American Indians. It is native to North America,
growing in moist swampy soil, but has been introduced elsewhere for medicinal and ornamental purposes.
The thick rhizome supports a stem sheathed in sword-shaped leaves. Bright blue-violet flowers appear in early to midsummer.
Volatile oil; iridin; salicylic and
isophthalic acids; resin.
Laxative; increases bile flow and urine production; circulatory and lymphatic stimulant.
Particularly used for skin eruptions,
for which it is given both internally and as a poultice. It is also given for biliousness associated with constipation and liver disturbances.
Decoction, tincture, tablets.