The root of a white-flowered kind of iris, called Florentine Iris, which is a native of Italy, and is distinguished by having two flowers on each stalk; the petals bearded, and the leaves sword-shaped. In a dried state, this root is well known on account of its grateful odour, which somewhat approaches that of the violet. It is consequently much used in the manufacture of hair-powder, and other articles, for which an agreeable scent is required. It is sometimes employed in medicine as a pectoral or expectorant, and sometimes in dropsies. In a recent state, the root is extremely acrid; and, when chewed, excites in the mouth a pungent taste, which continues for several hours ; but this acrimony is almost wholly dissipated by drying. Orris-root is chiefly imported into this country from Leghorn.