. The rhizome and rootlets of Caulophyllum thalictroides.

Characters. - Rhizome about four inches (10 centimetres) long, and about one-fourth to two-fifths of an inch (6 to 10 millimetres) thick, bent; on the upper side, with broad, concave stem-scars and short, knotty branches; externally grey-brown, internally whitish, tough and woody. Eootlets numerous, matted, about four inches (10 centimetres) long, and one twenty-fifth of an inch (1 millimetre) thick, rather tough; nearly inodorous; taste sweetish, slightly bitter, and somewhat acrid.

Dose. - 1-5 gr. in infusion.

Composition. - It contains the glucoside saponin (p. 918) and resins.

Uses. - It has little medicinal virtue, though it has been recommended as a diuretic, antispasmodic, and emmenagogue.