Trees tend to be long-lived, some reaching several thousand years old.The tallest known tree, a coast redwood named Hyperion, stands 115.6 m (379 ft) high.Trees have been in existence for 370 million years.
A tree typically has many secondary branches supported clear of the ground by the trunk.
This trunk typically contains woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another.
For most trees it is surrounded by a layer of bark which serves as a protective barrier.
Below the ground, the roots branch and spread out widely; they serve to anchor the tree and extract moisture and nutrients from the soil.
In botany, a tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species.
In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height.
Trees are not a taxonomic group but include a variety of plant species that have independently evolved a woody trunk and branches as a way to tower above other plants to compete for sunlight.
In looser senses, the taller palms, the tree ferns, bananas and bamboos are also trees.
Above ground, the branches divide into smaller branches and shoots.