Plate 11. Microscopic structure of a cross section
of the rhizome of Hydrastis canadensis.
This image is from Hydrastis Canadensis in the Drugs and Medicines of North America.
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.