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| image_caption = Kola Nut — pod and seeds The kola nut has a bitter flavor and [[caffeine]] content, and is chewed in many [[West Africa]]n cultures, individually or in a group set

...raditionally for thousands of years by human cultures all around the world and many play a significant role in society. This list covers plants which are ...etium tortuosum]]'' or "Kanna" has been used by South African pastoralists and hunter-gatherers as a mood-altering substance from prehistoric times.