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1. 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
   - blackjack oak, blackjack, Quercus marilandica
    
2. Small to medium deciduous oak of east central North America; leaves have sharply pointed lobes
   - northern pin oak, Quercus ellipsoidalis

Derived forms: jack oaks

Type of: oak, oak tree, scrub oak

Encyclopedia: Jack oak