Hamadryads
In Greek mythology, the Hamadryads are tree nymphs or dryads whose life is bound to the tree whose life they share when it is cut down, so they also die. The upper half of their bodies are female while the lower halves are the trucks and the roots of the tree.
John and Caitlin Matthews, The Element Encyclopaedia of Magical Creatures, 2013, Hamadryads, p 225
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