This section is from the book "A Text-Book Of Pharmacology, Therapeutics And Materia Medica", by T. Lauder Brunton. Also available from Amazon: A text-book of pharmacology, therapeutics and materia medica.
The rhizome and rootlets of Menispermum canadense.
Characters. - Rhizome several feet long, about a quarter of an inch (6 millimetres) thick, yellowish-brown or brown, finely wrinkled longitudinally and beset with numerous thin, rather brittle rootlets; fracture tough, woody; internally yellowish, with a thickish bark, a circle of porous, short, nearly square wood-wedges, and a large central pith; nearly inodorous; taste bitter.
Dose. - 5-20 gr. in infusion.
Composition. - It contains a small quantity of berberine and a colourless alkaloid.