Plants by Mail FAQ
Purdue's New Crop Resource
Erowid's Natural high FAQ
Howie's Herbal Smoking Mixtures
Michael Moore's Herbal-medical glossary
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.
Plant Healer Magazine: Very relevant to the practitioner.
http://www.henriettes-herb.com - Copyright 1995–2016 Henriette Kress.