Blue Ash
Scientific Name:Fraxinus quadrangulata
"

NOTES: Polygamo-dioecious: mostly dioecious (male and female flowers on separate plants) but with either a few flowers of the opposite sex or a few bisexual flowers on the same plant. Inner bark turns blue when exposed to air and was used to make dye. Square stems. MADBUCK.   
MADBUCK: Maple, Ash, Dogwood, and Buckeye) acronym for Ohio's four native trees with opposite leaves/branching.

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Blue Ash
Genus species: Fraxinus quadrangulata
Common Name: Blue Ash
Family Name: Oleaceae  
Deciduous or semi-evergreen shrubs or trees; leaves opposite, simple or compound; flowers bisexual or unisexual, regular, in various inflorescences; fruit a drupe, capsule, or samara.
Seed Type: Angiosperm
Origin:  
Native: native to North America.
Non-native: not native to North America.
Introduced Native: native to North
America, but not Rowe Woods.
* Definitions based on the USDA
terminology
Native
Category:Tree
CNC Habitat: Krippendorf Arboretum
Nature Playscape
Herb Wall
Identified by:A. Swanson