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Black Ash vs Green Ash

Black and green ash are sometimes confused where their ranges overlap, but they are usually easily distinguished by several different characteristics.

Black Ash (Fraxinus nigra)

Green Ash (Fraxinus pennsylvanica)

A tree native to North America, with a northerly distribution; often found in climax communities on wet sites.
A widely-distributed tree found mostly in floodplains, riparian areas, and swamps, and occasionally found on drier sites.
Leaves may have up to 11 leaflets; 9-11 is frequent.
Leaflets usually have at most 9 leaflets, commonly have 7 or fewer.
Leaflets sessile, directly attached to the central stalk of each leaf, with no petiole or stem.
Leaflets taper at the base to a short, winged petiole.
First two side buds separated from terminal bud by a length of twig.
First two side buds flush up against terminal bud.
Bark of mature trees covered in irregular, scaly plates, flaking off extensively.
Bark somewhat scaly, but less flakey.
Seed is strongly flattened and hardly thicker than the wing of the samaras; seed often not even visible in photographs.
Seed is much thicker than the winged portion of the samara, stands out visibly in photographs.