Tea tree or Ti-tree is a popular name that has been applied to a number of different, unrelated plants:

• Camellia sinensis (aka Thea sinensis), from which black, green, oolong and white tea are all obtained.
• Melaleuca alternifolia from which tea tree oil is obtained, in the family Myrtaceae.
• Leptospermum, also in the family Myrtaceae; notably
  • Leptospermum scoparium (Manuka) in New Zealand and southeast Australia.
• Kanuka (Kunzea ericoides) also in New Zealand.
• Boxthorn or Lycium in the family Solanaceae, notably
  • Duke of Argyll's Tea Tree (Lycium barbarum), also known as Wolfberry or Matrimony Vine.
• Ti (plant), Cordyline fruticosa, in the family Laxmanniaceae, formerly treated in the family Agavaceae.

Also:

• Tea Tree, Tasmania is a locality south of Hobart.
• Ti Tree, Northern Territory is a small town.

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