Black Walnut - Leaf


Black walnut leaves are alternate and pinnately compound and large in size, reaching 12 to 24 inches in length. Each leaf (shown here) is made up of 15 to 23 leaflets. The terminal leaflet is often absent.

The margin of the black walnut leaf is singly toothed.

Black walnut and English walnut differ in the number of leaflets, the shape of the leaflets, and the leaflet margin. black walnut leaves have a greater number of leaflets (15-23) than English walnuts (5-9). English walnut leaflets have more oval shaped leaves while black walnut leaves are generally smaller and narrower in shape. Black Walnut leaflets have toothed margins while English walnut leaflet margins are entire.

Black walnut leaves generally have more leaflets (15-23) compared to butternut (11-19). The leaflet size is of black walnut is typically smaller than butternut. Also butternut leaves are hairy on their midvein, while black walnut is hairless.


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© 2000 Rosie Lerner, Purdue University