"The rhizome and roots of Iris versicolor, Linné"—(U. S. P.). Nat. Ord.—Irideae. COMMON NAMES: Blue flag, etc. (see below). ILLUSTRATIONS: Meehan, Native Flowers and Ferns, I, 141; Bigelow, American Medical Botany, I, 155; Millspaugh, American Medicinal Plants, 173. Botanical ...