D&D Monsters: Dryads

Looking again at D&D creatures derived from Greek myth, we come to the dryad. In the original myths, dryads are a type of nymph, or female nature spirit, associated with trees. Originally, the tree specifically had to be an oak tree, but later on the term seems to have been used more broadly for woodland spirits in general. The term "hamadryad" was used for a dryad so closely bonded to her tree ("hama" means "together") that she would die if it did, but others seemingly had no such vulnerability. So far as one can tell, they were supposed to look like regular human women.

Dryads have occasionally appeared in works of fantasy fiction, most notably in C.S. Lewis' Narnia books, which maintains the distinction from hamadryads. In D&D, dryads and nymphs are different kinds of being, albeit with a number of similarities, but the latter did not make it into the 5E Monster Manual, something that's currently one of my criteria for including something in this series. In the first few editions they are, however, said to be "tree sprites"... but it's not clear what this means, since a sprite is yet another distinct creature in D&D, and one that resembles dryads rather less than nymphs do.