Dryad

Dryads (or "tree spirits") are nymphs, often associated with Greek mythology and Hinduism, which are said to live near, or in, trees. Dryads are born bonded to a specific tree. If they lived in the tree, they were referred to as hamadryads; otherwise they were simply dryads. If the tree died, the dryad associated with it died as well. For that reason, dryads and the gods punished any mortals who harmed trees.