Vol. 08. Bild 43. Hypericum quadrangulare.
This image is from Hayne's Getreue Darstellung und Beschreibung der in der Arzneykunde gebräuchlichen Gewächse, Achter Band, 1822., 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.