Tussila'go Far'fara, Farfara, Colts-foot (Leaves), Tussilago Leaves, Cough-wort, N.F. -- The dried leaf with not more than 3 p.c. of foreign organic matter, yielding not more than 4 p.c. of acid-insoluble ash; Europe, N. Asia, naturalized in N. United States. Low succulent perennial, creeping annulate rhizome, scaly scapes in spring, bearing a single head; flowers yellow. Leaves, petioled, pubescent (young--white, floccose beneath, old -- dark green above, glabrous below), orbicular, 8-15 Cm. (3-6') long and broad, cordate, dentate, red-brown teeth, palmately 5-9-nerved, glabrous above, wrinkled, greenish; odor indistinct; taste mucilaginous, faintly herbaceous, bitter. Powder, yellowish-green -- many hairs twisted together, elliptical stomata and striated epidermal cells with wavy vertical walls; few non-porous fibers and tracheae, parenchyma cells with chloroplastids; solvents: water, diluted alcohol; contains glucoside (bitter, resin, tannin, volatile oil, gum, wax, caoutchouc, ash 20 p.c. Demulcent, toxic; bronchitis, pulmonary affections, coughs. Dose, gr. 30-60 (2-4 Gm.); 1. Species Pectorales, 20 p.c. Decoction, Infusion, each 5 p.c., 3ss-1(15-30 cc.); Expressed juice; dried root, as well as leaves smoked for cough -- popular domestic remedy.