Fig. 073. Hydrastis - Rhizome, cross-section.
(18 diam.) A, Cortex. B, Vascular bundle. C, Medulla. (Photomicrograph).
This image is from Hydrastis in Sayre's Manual of Organic Materia Medica and Pharmacognosy, 1917.
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.