The edge of the habitat at which trees are capable of growing; the timberline.

(botany) Any tree that bears apples, principally Malus domestica but also certain wild species.

All the tissues of a tree external to the vascular cambium; includes epidermis, cortex and phloem.

The main structural member of a tree.

An Asiatic tree (Ailanthus altissima) having foliage similar to that of the sumacs and ill-scented staminate flowers, much used in traditional Chinese medicine, but considered invasive and often subject to control efforts.

A tropical American tree (Albizia saman) having bipinnate leaves, globose clusters of flowers with crimson stamens, and sweet-pulp pods eaten by cattle, also used as an ornamental.

(chiefly US) a recreational structure built among the branches of a tree / a tropical residence built in a tree, or on stilts

The fluid that circulates within the phloem of a tree to distribute water and nutrients.

Any of the most numerous family, Halcyonidae, of kingfishers; they are widely distributed in Africa, Asia and Australia.

(botany) The Osage orange tree.