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

American white oak, Quercus alba - large slow-growing deciduous tree of the eastern United States having stout spreading branches and leaves with usually 7 rounded lobes; yields strong and durable hard wood

Arizona white oak, Quercus arizonica - semi-evergreen shrub or small tree of Arizona and New Mexico having acorns with hemispherical cups

Quercus bicolor, swamp white oak, swamp oak - large flaky-barked deciduous oak of the eastern United States with leaves having fewer lobes than other white oaks; yields heavy strong wood used in construction; thrives in wet soil

Garry oak, Oregon oak, Oregon white oak, Quercus garryana - small deciduous tree of western North America with crooked branches and pale gray bark

California white oak, Quercus lobata, valley oak, valley white oak, roble - tall graceful deciduous California oak having leathery leaves and slender pointed acorns

bur oak, burr oak, mossy-cup oak, mossycup oak, Quercus macrocarpa - medium to large deciduous oak of central and eastern North America with ovoid acorns deeply immersed in large fringed cups; yields tough close-grained wood

durmast, Quercus petraea, Quercus sessiliflora - deciduous European oak valued for its tough elastic wood

common oak, English oak, pedunculate oak, Quercus robur - medium to large deciduous European oak having smooth leaves with rounded lobes; yields hard strong light-colored wood