I found this Scientific American Podcast with an interview with Nat Bletter who is doing a Doctorate at the New York Botanic Gardens, a world leader in ethnobotanical studies. A great talk about plant physiology, plant chemistry and culture.
http://www.scientificamerican.com/podcast/episode.cfm?id=1E5B6D81-E7F2-99DF-3A1431B73A41F3B9
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