Trees of Wisconsin
UW- Green Bay-Herbarium

Fraxinus comparison chart
White Ash tends to have clearly stalked leaflets with whitened undersides. The leaflets of Green Ash have short stalks and those of Black Ash are sessile (they have no stalk), and both lack a conspicuously whitened undersurface. On well developed branches of White Ash the leaf scars are often concave along the upper edge and the buds originate well within the curved portion of the leaf scar. The leaf scars of Green and Black ash are not concave along the upper edge or only slightly so. White Ash tends to occur primarily in upland forests, often with Sugar Maple. Black Ash is most often restricted to clearly wet sites. Green Ash is by far the commonest species of Ash in the southern two thirds of the state and often thrives in disturbed, young woods, both upland and lowland, and in old fields and other disturbed, open sites. The autumn leaf color of healthy White Ash trees often has a rich purplish tone or a distinctive reddish brown color, compared to the mostly yellow autumn leaves of Black and Green Ash.

  Twig Leaf scar Leaves

White Ash

Fraxinus americana

Black Ash

Fraxinus nigra

Green Ash

Fraxinus pennsylvanica