75. IRIS, N.F.—IRIS VERSICOLOR. N.F. BLUE FLAG. (1890.) A horizontal, jointed rhizome, generally cut into longitudinal slices; externally brown, closely annulate from the leaf-sheath remnants, and near the broad flattened end crowded with long, simple rootlets. Constituents: Acrid resin 25 per cent., fixed oil, starch, gum, tannin, sugar, iridin, and indications of a brownish, viscid, amorphous alkaloid. Preparation of Iridin: Obtained by precipitating hot alkaline solution by an acid. The eclectic method of preparation is to precipitate concentrated alcoholic tincture with water; mix dried precipitate with equal quantity of licorice root. Cholagogue, cathartic and alterative. Dose: 10 to 30 gr. (0.6 to 2 Gm.).
- Fluidextractum Iridis (U. S. P. 1890), Dose: 10 to 30 drops (0. 6 to 2 mils).
- Extractum Iridis (U.S.P. 1890), Dose: 1 to 3 gr. (0.065 to 0.2 Gm.).
A Manual of Organic Materia Medica and Pharmacognosy, 1917, was written by Lucius E. Sayre, B.S. Ph. M.