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Ash (Fraxinus)

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Ash Genus Details

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Ash trees are found mainly in the eastern and southeastern areas of the U.S. Most species bear male and female flowers on separate trees. Flowering ash, Fraxinus ornus, bears bisexual flowers, each containing male and female reproductive organs. The greenish yellow flowers first appear in early spring and are followed by winged seeds that drop in the fall. Ash can grow up to 90 feet tall and resists insects and disease. They are found in areas of full sunlight and well drained soil. Throughout the ages, species of ash have been used for medicinal and nutritional purposes.
Green ash (Fraxinus pennsylvanica)
Green ash (Fraxinus pennsylvanica)
American ash (Fraxinus americana) Lewis et al
American ash (Fraxinus americana) Lewis et al

Ash Allergy Info

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Most species of ash are major offenders in spring pollinosis. Ash is also known to cross-react with olive pollen, which is strongly allergenic.

Ash Pollen Description

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Grains are prolate or suboblate to spheroidal and 3-(4)-(6)-colpate. The sexine is typically reticulate.
Pollen grains are 26-28 micrometers.
Fraxinus americana (American ash), single grain. Herb. MIN
Fraxinus americana (American ash), single grain. Herb. MIN
Fraxinus americana (American ash), multiple grains. Herb. MIN
Fraxinus americana (American ash), multiple grains. Herb. MIN

Species in This Genus

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Allergenicity Legend:
Mild Allergen Mild Allergen  |  Moderate Allergen Moderate Allergen  |  Severe Allergen Severe Allergen  |  Allergy Test Allergy Test Available
Ash (Fraxinus) is a genus of the OLEACEAE family.
This genus includes the following allergenic species:

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Ash Genus Location

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The shaded areas on the map indicates where the genus has been observed in the United States. Click the map to see a full scale version of these allergy areas.
  - Native, observed in a county
  - Introduced, observed in a county
  - Rarely observed

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