In Greek mythology, Hamadryas () was the daughter of Orius (mountain-god of Othrys or the Pindus) and sister of Oxylus (daimon of the mountain forest).Athenaeus 3.14
Name Hamadryas' name means "Together-with-Tree" and "Together-with-Oak" from the Greek words hama and drys - the latter being both "holm oak" and generic "tree."
Mythology By her own brother, Oxylus, Hamadryas bore eight daughters—namely Aegeirus (poplar), Ampelus (vine), Balanus (acorn), Carya (walnut), Craneia (cornel), Morea (mulberry), Ptelea (elm), and Syke (fig). These were called hamadryads, and many trees derive their names from them.
Notes
References Athenaeus, Deipnosophists, Books 1-9 translated into English by Charles Burton Gulick (1868-1962), from the Loeb Classical Library edition of 1927-41. Available on Topos Text.