The scientific name for the plant from which tea is derived is Camellia sinensis.
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Leaves are the part of the camellia sinensis that are used to
produce tea.
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Tea is traditionally separated in two groups. Chineese/Japaneese - Camellia sinensis (sinensis in Latin means "Chineese") and Indian - Camellia assamica. There is also a natural hybrid of those two types - the ceylonian tea.