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Oak (Quercus)

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Oak Genus Details

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Oaks are a particularly large genus, with various species growing throughout the U.S. They are commonly found in residential areas, as well as parks, and remote forests. The trees are large, reaching heights of 150 feet. The plants contain both male and female flowering parts, meaning they produce pollen, and can be pollinated, too, either by themselves, or by other plants. The fruit is an acorn, which provides a staple in the diet of many small animals.
Burr oak (Quercus macrocarpa)
Burr oak (Quercus macrocarpa)
Northern white oak (Quercus alba) Lewis et al
Northern white oak (Quercus alba) Lewis et al

Oak Allergy Info

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They shed considerable amounts of pollen, which presents a significant challenge to allergy sufferers. The pollen is commonly allergenic, and may cause severe reactions.

Oak Pollen Description

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The pollen grains are spheroidal or oblately flattened and triangular in outline. They are tricolpate with long and narrow colpi.
Pollen grains are usually 24-38 micrometers.
Quercus genus, single grain. Herb. MIN
Quercus genus, single grain. Herb. MIN
Quercus genus, multiple grains. Herb. MIN
Quercus genus, 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
Oak (Quercus) is a genus of the FAGACEAE family.
This genus includes the following allergenic species:

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Oak 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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