Hallucinogenic Plants was a part of a series of books and field guides published in the seventies under the name Golden Guides. Hallucinogenic plants were written by Richard Evans Schultes – a founder of modern ethnobotany. The book is a good intro to psychedelics that has been much further explored since it was published, but I have chosen to post it here because of its usability, rich illustrations (by Elmer W. Smith) and the fact that Richard Evans Schultes wrote it.
Download it here:
Remember, we have an entire section with books on hallucinogenic plants here: https://www.holybooks.com/category/poisonpath/