Fig. 142. Cross-section of Cranesbill.
a. Bark. b. Wood-wedge. c. Pith. (12 diam.)
This image is from Geranium 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.