Quercus macrocarpa

bur oak, burr oak, savannah oak, overcup oak, prairie oak, mossy-cup oak, mossy-overcup oak, blue oak
Family

Fagaceae

Leaf Arrangement

alternate

Leaf Attachment

petiolate

Leaf Margin

lobed, revolute, subentire

Leaf Type

simple

Leaf Shape

elliptic, obovate

Growth Form

shrub, tree

Flower Month

March - May

Height (meters)

30.5

Milky Sap

No

Armed/Unarmed

Unarmed

Origin

native

Lifespan

perennial

Leaf Retention

Deciduous


Wetland Class

FACU

Field Characters

Broad at top of leaf and tapers to base. Largest acorn.

Animal Use

Attracts songbirds, ground birds and mammals. Substrate-insectivorous birds, Fruit-birds, Fruit-mammals, Fruit-rodents, Fruit-deer. Also attracts butterflies and is a larval host for the Edwards hairstreak and Horaces duskywing butterfly.

Habitat

Prairies, open woods, sandy ridges, and stream edges. Widely distributed and capable of withstanding a wide range of harsh conditions (one of the most drought resistant oaks) throughout eastern North America; usually found on limestone or calcareous clay. Upland woods and valley floors, often forming savannas.

Plant Uses

All of the white oaks are heavy, very hard, and strong. The wood is subject to large shrinkage during seasoning, and extra care must be taken to avoid checking and warping. Pores of the heartwood are impervious to liquids, making white oak the only successful wood for use as tight cooperage. Large amounts of higher grades are used for bourbon barrels. The heartwood is comparatively decay resistant, more so than that of red oaks. White oaks are above average in all machining operations except shaping. All oaks in the white oak group share just about the same properties and uses. Most white oak is made into lumber for flooring, furniture, tight cooperage, millwork, timbers, handles, boxes, and crates. Perhaps the largest amounts go into high-quality flooring, barrels, kegs, and casks. It is prized for use of construction of ships and boats.