Fig. 056. Cross section of the root.
(Drawn with the 2/3-in. objective and the "C" eye-piece.)
This image is from Coptis 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.