White Ash (American Ash)
Kingdom: Plantae > Division: Tracheophyta > Class: Magnoliopsida > Order: Lamiales > Family: Oleaceae > Genus: Fraxinus > Species: Fraxinus americana · Oleaceae (Olive family) · Pinnately compound (typically 5-9 leaflets), deciduous
Species
Fraxinus americana
Leaf Type
Pinnately compound (typically 5-9 leaflets), deciduous
Family
Oleaceae (Olive family)
Shape
Leaflets are ovate to lanceolate-elliptic with an acuminate tip
Size
Total compound leaf is 8-15 inches long; individual leaflets shown are approximately 3-5 inches long and 1.5-2.5 inches wide, which matches normal species range.
Margin
Entire to sparsely or finely serrate near the upper half of the blade
Arrangement
Opposite leaf arrangement on twigs; leaflets are pinnately arranged along the rachis with petiolules (short stalks)
Rarity
Common historically, but rapidly declining in the wild due to Emerald Ash Borer infestation; currently classified as Critically Endangered by IUCN.
Color & Pattern
Deep medium-green adaxial (upper) surface, noticeably paler/whitish-green abaxial (lower) surface; uniform summer green with faint minor light flecks.
Venation Pattern
Pinnate venation with prominent central midrib and arcuate secondary veins extending toward the leaflet margins.
Texture & Surface
Smooth (glabrous) to slightly papery on the upper surface, soft matte finish with distinct glaucous/whitish hue underneath.
Description
White Ash is a large native forest tree reaching up to 70-100 feet tall. It is characterized by opposite pinnately compound leaves, diamond-patterned bark at maturity, and single-winged samaras for seeds. In autumn, the foliage transitions dramatically to shades of yellow, purple, and deep reddish-violet.
Key Features
Opposite leaf arrangement, pinnately compound leaves with distinctly stalked leaflets that are significantly paler underneath, U-shaped leaf scars with the terminal bud sitting inside the notch.
Habitat
Moist, well-drained slopes, rich upland forests, river valleys, and wooded floodplains in full sun to partial shade.
Geographic Range
Native to eastern and central North America, ranging from Nova Scotia south to Florida and west to Texas and Minnesota.
Condition Notes
Overall condition is Good; healthy green coloration with minor mechanical spots and slight surface dust/pollen debris, no severe insect galls or chlorosis visible.
Interesting Facts
White ash wood is famous for its exceptional shock resistance and flexibility, making it the premier material for traditional wooden baseball bats (including Louisville Sluggers) and tool handles.
Medicinal & Uses
Historically used in Native American herbal remedies; primary modern non-medicinal value is for high-grade lumber, furniture, sports equipment, and firewood.
Ecological Role
Serves as a host plant for numerous native lepidoptera (such as the Tiger Swallowtail butterfly) and provides seeds eaten by songbirds, wild turkeys, and small mammals.
Similar Species
Green Ash (Fraxinus pennsylvanica) which has leaflets that are green underneath and serrate margins; Boxelder (Acer negundo) which has fewer (3-5) coarsely lobed leaflets; Hickory (Carya spp.) which has alternate leaf arrangement.
Foraging Tips
Look for opposite compound leaves with 5-9 stalked leaflets that feel smooth on top and show a pale underside, paired with thick gray twigs.
Toxicity Warning
Non-toxic to humans, horses, dogs, and livestock.