Trees of Alabama and the Southeast

Lisa Samuelson, Ph.D.
School of Forestry and Wildlife Sciences
Auburn University

BLACKJACK OAK
Quercus marilandica
Fagaceae

Leaves are simple, alternate, deciduous and leathery with up to 3 large, bristle-tipped lobes at the apex. Leaves are dark green on the surface, very hairy below, and often resemble a fan in shape. Twigs are gray and pubescent. Terminal buds are angled, pointed, red-brown and pubescent. Bark is thick, dark and rough. Fruit is an acorn up to 3/4 inches long with a downy pubescent nut with a rigid point and bowl-shaped cap covering up to 1/2 of the nut. Form is up to 15 m (50 ft) in height. The acorn matures in two seasons. Blackjack oak is usually a small tree on dry sites in the southeastern U.S. and is intolerant of shade. The wood is used as red oak lumber and for fuel. Acorns eaten by game birds, deer, and many small mammals.

Photographs by Mike Hogan.

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