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In page Leptospermum lanigerum:

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Species within the genus Leptospermum are usually referred to as 'tea-trees'. This name was first used by the crew of Captain Cook, who brewed a tea from the aromatic leaves in Australia and New Zealand, as they believed it would protect them from scurvy.[1] The spelling 'ti-tree' often occurs in literature, however this is incorrect.[4] The naming of the essential oil 'Tea-tree oil' is another common misuse of the name, as Tea-tree oil actually comes from the leaves of Melaleuca alternifolia, not a Leptospermum species.[1]