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

• Camellia sinensis, from which tea is obtained.
• Leptospermum in the family Myrtaceae.
• Melaleuca from which tea tree oil is obtained; also in the family Myrtaceae.
• Leptospermum scoparium (Manuka) in New Zealand
• Kanuka (Kunzea ericoides) also in New Zealand.
• Boxthorn or Lycium in the family Solanaceae
• Ti (plant), Cordyline fruticosa, in the family Laxmanniaceae, formerly treated in the family Agavaceae.

Also:

• Ti Tree, Northern Territory is a small town
• tea tree oil