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Which Malvales genus produces caffeine-containing kola nuts?

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The genus that produces caffeine-containing kola nuts is Cola, which belongs to the order Malvales.1

Specifically, the nuts are harvested from two primary species, Cola acuminata and Cola nitida. These trees are native to tropical Africa and are valued for their stimulant properties, containing caffeine, tannin, and theobromine. While historically significant as a flavoring agent for soft drinks, many modern commercial manufacturers now use synthetic alternatives to replicate the flavor of the kola nut.12