Getreue Darstellung und Beschreibung der in der Arzneykunde gebräuchlichen Gewächse. Sechster Band. Gottlob Friedrich Hayne, 1819.
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.