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kola nut
The kola nut is the fruit of the kola tree, a genus (''Cola'') of trees that are native to the tropical rainforests of Africa. The caffeine-containing fruit of the tree is used as a flavoring ingredient in beverages, and is the origin of the term "cola".
==General description==
The Kola nut is a caffeine-containing nut of evergreen trees of the genus ''Cola'', primarily of the species ''Cola acuminata'' and ''Cola nitida''. ''Cola acuminata'', an evergreen tree about 20 metres in height, has long, ovoid leaves pointed at both the ends with a leathery texture. The trees have yellow flowers with purple spots, and star-shaped fruit. Inside the fruit, about a dozen round or square seeds develop in a white seed-shell. The nut’s aroma is sweet and rose-like. The first taste is bitter, but it sweetens upon chewing. The nut can be boiled to extract the cola. This tree reaches 25 meters in height and is propagated through seeds. ''C. nitida'' and ''C. acuminata'' can easily be interchanged with other ''Cola'' species.
Kola nuts comprise about 2% caffeine, as well as containing kolanin and theobromine. All three chemicals function as stimulants.〔
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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