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Hornbeam (Carpinus)

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Hornbeam Genus Details

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Hornbeams are small trees with leaves that resemble birch leaves. The blue beech, or American hornbeam is the only hornbeam species native to the U.S., and grows 15-25 feet tall. Blue beech are common in moist woods and along streams in the eastern U.S. Plants are both male and female, meaning they can pollinate themselves or be pollinated by other plants. The fruit is a one-seeded nut. Flowering occurs in April-May before the leaves emerge and usually precedes birch in flowering.
American Hornbeam (Carpinus caroliniana).
American Hornbeam (Carpinus caroliniana).
American Hornbeam (Carpinus caroliniana).
American Hornbeam (Carpinus caroliniana).

Hornbeam Allergy Info

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Hornbeams are wind-pollinated and produce abundant pollen. This pollen has been reported to cross-react with birch and alder pollen. Birch is considered particularly allergenic.

Hornbeam Pollen Description

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Pollen grains are isopolar, suboblate to oblate or oblate-spheroidal and usually have 3-4 pores. The pores are small and usually circular. The exine is smooth but can be granular around the pores.
Pollen grains vary in size from 26-31 x 28-35 micrometers.
Carpinus caroliniana, single grain. Herb. MIN
Carpinus caroliniana, single grain. Herb. MIN
Carpinus caroliniana, multiple grains. Herb. MIN
Carpinus caroliniana, 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
Hornbeam (Carpinus) is a genus of the BETULACEAE family.
This genus includes the following allergenic species:

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Hornbeam 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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