Ac'orus Cal'amus, Calamus Root, Sweet Flag. -- Araceae. The unpeeled, dried rhizome, U.S.P. 1820-1900; N. America, Europe, Asia, swamps. Perennial herb; leaves, like those of Iris versicolor, 1-1.3 M. (3-4degrees) long, 2-4 Cm. (4/5 - 1- 3/6') wide, equitant, sharp-pointed, sharp-edged; flowers on scape, spadix (spike) 5-10 Cm. (2-4' long, 1 Cm. (2/5') thick, minute, greenish-yellow. Rhizome, .6-1 M. (2-3 degrees) long, 1-2 Cm. (2/5 - 4/5') thick, entire or longitudinally split pieces, cylindraceous, yellowish-brown, wrinkled, annulate (remnants of leaf-sheaths), leaf-scars above, pitted root-scars beneath, fracture short, sharp, corky, spongy, whitish, showing oil cells; odor aromatic; taste pungent, bitter; solvents: alcohol, hot water partially; contains (most in cortex) volatile oil 1.5-3.5 p.c., acorin .2 p.c., choline (calamine), resin. Stimulant, carminative, tonic bitter, aromatic; dyspepsia, colic, flatulency, coughs, flavoring. Dose, gr. 15-60 (1 - 4 Gm.); fluid-extract (75 p.c. alcohol), mxv-60 (1 - 4 cc.; tincture 20 p.c., 3j - 2 (4-8 cc.); infusion.