Large tree up to 100 feet tall; trunk diameter up to 4 feet; crown pyramidal or ovoid, with slender branches; trunk straight, columnar.

 Light or dark gray, with diamond‑shaped furrows between flat‑topped, sometimes scaly, ridges.

 Slender, gray or brown, sometimes with a few hairs; leaf scars opposite, horseshoe‑shaped, with several bundle traces forming a half‑moon.

 Rounded, dark brown, finely hairy, up to % inch long.

 Opposite, pinnately compound, with 5‑9 leaflets; leaflets lance‑shaped to lance‑ovate, often curved, pointed at the tip, rounded or tapering to the base, up to 5 inches long and about half as broad, shallowly toothed along the edges, green and smooth on the upper surface, paler and smooth or hairy on the lower surface.

 Staminate and pistillate borne on separate trees before the leaves begin to expand, minute, without petals, purplish, in crowded clusters, soon becoming elongated and less crowded.

 Paddle-shaped, winged, up to 2 1/2 inches long and 1/4 inch wide, several in a cluster, seeded at the base.

Bottomlands and wooded slopes.

 Numerous throughout park,  particularly  near river.

 White Ash differs from Green Ash in having distinctly paler lower leaf surfaces. Plants with hairy leaves resemble Red Ash, but the fruits do not have the wing extending down beyond the seed in the White Ash.

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Tree species facts from Robert Mohlenbrock , Forest Trees of Illinois , 1996