Technically, any "tea" that does not come from the camellia sinensis plant isn't actually a "tea" at all. These herbs fit into their own categories. Rooibos, or "red tea", comes from a South African bush. Rooibos, just like most herbal hot water infusions, is naturally caffeine free, yet it contains many of the same beneficial properties associated with tea. Yerba Mate and Guayusa are closely related cousins from the holly family and are native to South America. Yerba Mate and Guayusa have a slightly higher caffeine content than tea but not as much as coffee.
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