Olea oleaster

Olea oleaster, or wild olive, is a subspecies of the cultivated olive tree, Olea europea. Originating in the Mediterranean Basin, it is considered an ancestor to the modern olive, which was likely domesticated during the fourth and third millennia BCE from multiple local populations.

The wild olive (Ancient Greek κότινος / kótinos), which ancient Greeks distinguished from the cultivated olive (ἐλαία / ἐλἀα), was used to fashion the olive wreath awarded victors at the ancient Olympic games. The ancient and sacred wild olive tree of Olympia stood near the Temple of Zeus, patron of the games.

Due to natural hybridization and the very ancient domestication and extensive cultivation of the olive throughout the Mediterranean Basin, wild-growing feral forms of olive, called "oleasters", constitute a complex assortment of populations, potentially ranging from feral forms to the wild olive. The wild olive is characteristic of the maquis shrubland, itself partly the result of centuries, if not millennia, of human propagation.

The drought-tolerant sclerophyllous tree is believed to have originated in the eastern Mediterranean Basin; it still provides the hardy and disease-resistant rootstock on which cultivated olive varieties are grafted.