223. TORMENTILLA.—TORMENTIL. The rhizome of Potentil'la tormenti'la Sibthorp. Habitat: Europe. Large, somewhat fusiform, longitudinally wrinkled, and rough from numerous stem and rootlet scars; externally dull reddish-brown; fracture smooth, showing a pale reddish interior, consisting of one or two distinct circles of wood-fiber around a large central pith; inodorous; taste astringent. Used as a tonic and astringent. Dose: 10 to 30 gr. (0.6 to 2 Gm.), in powder or decoction.