Quercus macocarpa
Common name: 
Bur Oak
Mossycup Oak
Pronunciation: 
KWER-kus ma-kro-CAR-pa
Family: 
Fagaceae
Genus: 
Type: 
Broadleaf
Native to (or naturalized in) Oregon: 
No
  • Deciduous tree, 70-80 ft (21-24 m) height, similar or greater spread, developing into an oval form with a massive trunk and stout branches.  Bark dark gray to gray-brown, becoming deep ridged and furrowed.  Leaves alternate, simple, 10-25 cm long, about half as wide, obovate to oblong-obovate, generally cuneate base, shape variable, often with a broadly expanded toothed portion above 2 deep notches and a lower portion with a few short, rounded lobes, other leaves with 7-9 deep lobes (resembling white oak), upper surface glossy green, pale and hairy below.  Autumn color yellow-green, yellow, and yellow-brown. Fruit (acorn) solitary, 2-4 cm long, enclosed more than half by a deep cap which is conspicuously fringed.
  • Sun, difficult to transplants.  Very adaptable to various soil conditions and fairly tolerant of urban conditions.
  • Hardy to USDA Zone 3      Native range from Nova Scotia to Pennsylvania, west to Manitoba and Texas.
  • macrocarpa: with large fruit
  • Corvallis: in the parking strip on the north side of Harrison Ave. west of 14th St.
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  • expanding leaves and flowers (catkins)

    expanding leaves and flowers (catkins)

  • plant habit

    plant habit

  • plant habit

    plant habit

  • plant habit

    plant habit

  • leaf

    leaf

  • immature fruit and leaves

    immature fruit and leaves

  • leaves and immature fruit

    leaves and immature fruit

  • leaves and fruit

    leaves and fruit

  • ripening fruit (acorns), September

    ripening fruit (acorns), September

  • plant habit, fall

    plant habit, fall

  • plant habit, fall

    plant habit, fall

  • leaves, fall

    leaves, fall

  • mature fruit (acorns)

    mature fruit (acorns)

  • plant habit, winter

    plant habit, winter

  • trunk, bark

    trunk, bark

  • winter twigs, buds

    winter twigs, buds