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Hop-Hornbeam (Ostrya)

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Hop-Hornbeam Genus Details

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Hophornbeams are small hardwood trees with leaves that resemble birch leaves. These leaves are simple and alternate. The trees grow in moist soils, and can reach heights of 50 feet. The fruit is a one seeded nut and is the source for the common name of "hop" hornbeam. The clusters tend to look like hops.
Hop-hornbeam (Ostrya virginiana)
Hop-hornbeam (Ostrya virginiana)


Hop-Hornbeam Allergy Info

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Hophornbeams have been known to cause allergic reactions but exposure to the pollen is more limited than others in the allergenic Betulaceae family.

Hop-Hornbeam Pollen Description

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Pollen grains are isopolar, suboblate to oblate or oblate-spheroidal and usually have 3 or occasionally 4 pores. The exine of hophornbeam pollen is granular.
Pollen grains vary in size from 16-20 x 21-24 micrometers.
Ostrya virginiana, single grain. Herb. MIN
Ostrya virginiana, single grain. Herb. MIN
Ostrya virginiana, multiple grains. Herb. MIN
Ostrya virginiana, 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
Hop-Hornbeam (Ostrya) is a genus of the BETULACEAE family.
This genus includes the following allergenic species:

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Hop-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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