oak tree, oak - a deciduous tree of the genus Quercus; has acorns and lobed leaves; "great oaks grow from little acorns"

California live oak, coast live oak, Quercus agrifolia - highly variable often shrubby evergreen oak of coastal zone of western North America having small thick usually spiny-toothed dark-green leaves

canyon live oak, canyon oak, maul oak, Quercus chrysolepis, iron oak - medium-sized evergreen of southwestern United States and northwestern Mexico with oblong leathery often spiny-edged leaves

Quercus virginiana, southern live oak - medium-sized evergreen native to eastern North America to the east coast of Mexico; often cultivated as shade tree for it wide-spreading crown; extremely hard tough durable wood once used in shipbuilding

interior live oak, Quercus wislizenii, Quercus wizlizenii - medium-small shrubby evergreen tree of western North America similar to the coast live oak but occurring chiefly in foothills of mountain ranges removed from the coast; an important part of the chaparral