For those interested in furthering their studies in magic, witchcraft and baneful herbs please check out the following titles:
Herblore
Witchcraft Medicine: Healing Arts, Shamanic Practices, and Forbidden Plants
The Magical and Ritual Use of Herbs
The Magical and Ritual Use of Aphrodisiacs
Plants of the Gods: Their Sacred, Healing, and Hallucinogenic Powers
Pharmako/Poeia, Revised and Updated: Plant Powers, Poisons, and Herbcraft
Pharmako/Gnosis, Revised and Updated: Plant Teachers and the Poison Path
Pharmako/Dynamis, Revised and Updated: Stimulating Plants, Potions, and Herbcraft
Hoodoo Herb and Root Magic: A Materia Magica of African-American Conjure