Vol. 13. Bild 31. Gentiana purpurea.
This image is from Hayne's Getreue Darstellung und Beschreibung der in der Arzneykunde gebräuchlichen Gewächse, Dreizehnter Band, 1837., page __.
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.