The bark of the willow has, indeed, been justly considered as a succedaneum for Peruvian bark, as has also that of the horse-chestnut tree, the leaf of the holly, the snake-root, etc.
La corteza de sauce está considerada como un sucedáneo de la quina, lo mismo que el castaño de Indias, las hojas de acebo, la serpentaria y otras plantas.