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blackjack, jack oak, blackjack oak, Quercus marilandica | a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets ❲Quercus marilandica❳ |