Apocynum. Fig. 4.
This image is from the article "Laboratory Contributions from the Course Preparatory to Medicine in the University of Pennsylvania" in the American Journal of Pharmacy, 1884.
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.