Plant Medicine
http://www.phytotherapy.info/
American Botanical Council
http://www.herbalgram.org/
Herb Research Foundation
http://www.herbs.org/index.html
Phytotherapies.org
http://www.phytotherapies.org/
Medical Herbalism
http://medherb.com/articles.htm
Jim Duke's Database
http://www.ars-grin.gov/duke/