Fig. 337. Bark of C Calisaya entirely deprived of periderm.
(This figure shows the digital furrows, and the short fibrous fracture of the liber).
This image is from _ in Pereira's Elements of Materia Medica and Therapeutics, 1854.
A herbal distance course
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.