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
- 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.
The tea-plant is a small tree or shrub, with five white petals, or flower- leaves, shaped like those of a rose, having smaller ones of the same figure in the intermediate spaces, and twenty or more filaments or threads. The tree sometimes grows to a moderate height, and is generally bare on the lower part, with a number of small branches growing close together towards the top. The leaves are small and pointed, like those of the myrtle; it bears a dry roundish seed-case, and grows commonly in dry places near the shores. The leaves, as I have already observed, were used by many of us as tea, which has a very agreeable bitter and flavour when they are recent, but loses some of both when they are dried. When the infusion was made strong, it proved emetic to some in the same manner as green tea.—James Cook, A Voyage Towards the South Pole and Round the World, Volume 1
- Tea Tree, Tasmania is a locality north east of Hobart.
- Ti Tree, Northern Territory is a small town.
- Westfield Tea Tree Plaza, large shoppoing centre in Modbury South Australia.