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ARS Home Midwest Area Ames, Iowa Plant Introduction Research Home NPGS Ash Conservation Project





- Research
- A Cooperative Effort
- Progress Made
- Emerald Ash Borer
- Conservation Methods
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- Collecting Ash Seed
- How to Collect
- Identifying Ash
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Identifying Ashheadline bar How to identify Eastern North American*Fraxinus*species In our primary target region, there are six, widely recognized native*Fraxinus*species. Here is a quick key to help distinguish among them during the growing season: 1. Young branches 4-angled, often winged
*F. quadrangrandulata*  (Blue Ash)1. Young branches more-or-less circular in cross-section2. Lateral leaflets without stalks
*F. nigra*  (Black Ash)2. Lateral leaflets with stalks3. Leaflets strongly whitened beneath
*F. americana*  (White Ash)3. Leaflets green or rusty beneath4. Lateral leaflets gradually narrowed at base into a narrow wing that runs down the upper part of the leaflet stalk
*F. pennsylvanica*  (Green Ash)4. Lateral leaflets acute at base; leaflet stalk without wings5. Leaflets with long, tapered tips; fruits very large (4 to 7.5 cm long) and narrowly oblong
*F. profunda*  (Pumpkin Ash)5. Leaflets with short acute or blunt tips; fruits smaller (2.5 to 5.5 cm long), widest above the middle, winged to the base
*F. caroliniana*  (Carolina Ash)  Ash Key illustrations: 
     Other traits and habitat preferences that can help distinguish among these six species are described below. We have included some images of mature fruits (seeds), stems and buds that may be helpful for distinguishing among these species at other times of the year.   *F. americana* *F. americana*typically grows in moist, upland forests, where it often associates with sugar maple, northern red oak, basswood, and yellow birch. Its leaflets are often entire or with very shallow teeth. The bud scars are U-shaped.  Fraxinus americana
    *F. caroliniana* *F. caroliniana*typically grows in very wet shrubby thickets along the coastal plain. It is more of a shrub than a tree, with trunks less than 15 cm (6") in diameter. (No images yet available.)     *F. nigra* *F. nigra*typically grows in wet woods with spruce and larch, except in the southern part of its range where it can often be found in north-facing forested slopes. Its terminal buds are large and dark brown to black. The bud scars are more-or-less flat topped.  Fraxinus nigra
    *F. pennsylvanica* *F. pennsylvanica*has the widest habitat range of all native ash, ranging from elm-cottonwood-silver maple floodplain forests to being an old-field invader, even on upland sites. It can also be found with bald cypress and pumpkin ash in inundated swamps. It is extremely variable in twig and leaf pubescence. Its leaflets are usually toothed. Its winter buds are brown and the bud scars flat-topped, half circles.   Fraxinus pennsylvanica
    *F. profunda* *F. profunda*typically grows in flooded open forests with bald cypress and water tupelo. It can be a very large tree, up to 120' tall, with very large leaflets (to 20 cm long) and the largest fruits of all native species. Its leaves are lustrous above and often covered with fine reddish hairs beneath. Young branches are typically covered with velvety hairs. (No images yet available.)    *F. quadrangulata* *F. quadrangulata*typically grows on alkaline or calcareous soils (derived from limestone) with a wide range of lime-loving plants, including Kentucky coffeetree, bur oak, hackberry, and red cedar (on particularly dry sites). Its terminal buds are grayish yellow and the bud scars narrowly U-shaped.  Fraxinus quadrangulata
    Seed comparison 
    In addition,*Fraxinus excelsior*(European Ash) is sometimes cultivated as a landscape tree in the Eastern United States and Canada. It would key to*F. nigra*above. However,*F. nigra*has tufts of tan to reddish hairs at the base of each leaflet, but*F. excelsior*does not.


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