In
botany, a
tree is a
perennial plant with an elongated
stem, or
trunk, usually supporting
branches and
leaves. In some usages, the definition of a tree may be narrower, e.g., including only
woody plants with
secondary growth, only plants that are usable as
lumber, or only plants above a specified height. Wider definitions include taller
palms,
tree ferns,
bananas, and
bamboos.