Peyote (Lophophora williamsii) - Hallucinogenic Plants A Golden-Guide 116a
Peyote (Lophophora williamsii)
A Golden Guide to Hallucinogenic Plants by Richard Evans Schultes & Elmer W. Smith
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Also more information about this plant on the Erowid database.
These plants have been used by people for visionary and ceremonial purposes since time immemorial. They are an immense gift to humankind, and have shaped and enriched our culture. Many of these plants are to be used with great caution due to their powerful effects.