Yellow root (Xanthorhiza simplicissima syn. Zanthorhiza apiifolia). Illustration from: Bulletin of the Lloyd Library of Botany, Pharmacy and Materia Medica, 1931. Drugs and Medicines of North America by J. U. & C. G. Lloyd.

Yellow root (Xanthorhiza simplicissima syn. Zanthorhiza apiifolia).
Official drug in the United States Pharmacopoeia until 1880.
Contains berberine, an antimicrobial alkaloid.
Official in the National Dispensatory, 1884

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