Other Common Names: Mossycup oak, scrub oak
- Deciduous tree, grows up to 30m, usually smaller in Manitoba.
- Grey to brown bark, deeply furrowed when mature.
- Twigs are hairy when young, becoming hairless. Older twigs often form raised ridges.
- Leaves are simple, alternate, ovate, lobed, and 15-30 cm long, with fine hairs on underside.
- Fruit is an acorn, 20-30 mm long, half covered with a cap. Dispersed by animals.
- Monoecious (individual trees have both male and female flowers)
- Male flowers are green/brown, on catkins, 10-15 cm long, at the tip of last years growth.
- Female flowers have green scales, tinged with red, growing on the axils of new growth.
- Flowers appear in spring, before the leaves, male flowers maturing before female flowers, limiting self-pollination.
- Wind pollinated.
- Can also reproduce by shoots.
- Bur oak is the only oak tree native to Manitoba. It’s wavy/lobed leaf margins distinguish it from all other trees in the area.
- Acorns eaten by bears, squirrels, rabbits, deer, and many birds.
- Deer, elk, moose and porcupine eat the leaves, twigs, and bark.
- Wood is used for cabinetry, hardwood floors, and fenceposts.
- “Oak” comes from Old English “ac,” which is derived from an ancient name for the oak tree. “Bur” refers to the prickly husk around the acorn.
- “Macrocarpa” means “large-fruited,” from Latin “macro” meaning large, and Greek “karpos,” meaning “fruit.”
- Commonly lives 200-300 years, can live up to 400.