Trees of Alabama and the Southeast

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

Black Walnut
Juglans nigra
Juglandaceae

Leaves are alternate, deciduous and pinnately compound with up to 21 lanceolate leaflets, usually with no terminal leaflet (juvenile trees often show a terminal leaflet). Twigs are stout with monkey-faced leaf scars and a brown chambered pith. Bark is dark brown to black and deeply grooved. Nuts are round, weakly corrugated, and enclosed by a round, green, indehiscent husk. Form is up to 39 m (130 ft) in height and 2.4 m (8 ft) in diameter. Black walnut is found on fertile, moist sites in the east and central U.S. and is intolerant of shade. The commercially valuable wood is used for furniture and veneer. The nuts are eaten by squirrels and people.

Photographs by Mike Hogan.

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