Green Ash

Arbor walk #23, Treekeeper ID #2384

This native tree species is threatened by the Emerald Ash Borer. Since its discovery in 2002, the Borer, a native of Asia, has killed hundreds of millions of ash trees in North America. Washington University is monitoring the health of ash trees and is treating a select few to prevent depletion of the species from the campus forest.

This tree is widely used for ornamental purposes, and is the most widely planted tree of the American Ashes. One of the most distinguishing features of the Green Ash is its anastomosing bark. Although the Green Ash bears great similarity to the White Ash, they can be distinguished by examining their leaf scars and lower leaf surfaces.

Common NameGreen Ash
Latin NameFraxinus pennsylvanica
Indigenous Name(s)
Cultivar/Variety
Commercial Name

Take a Look Around

More about Tree #23:

Where to find Arbor Walk #23

Data on the space around this tree

Data on this tree over time

More about the Green Ash in general:

How to identify Green Ash

Relationship of Fraxinus pennsylvanica to other species in the Arboretum

Global Distribution of Green Ash

Additional Resources on the Green Ash