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Hydrangea (Hydrangea)

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Hydrangea Genus Details

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Hydrangeas are opposite-leaved shrubs and vines native to North America and Asia. The individual flowers are small and arranged in clusters of varying size. In some species, there are both sterile 'ray' flowers and fertile flowers in the same cluster. Hydrangea shrubs reach 3 to 9 feet in height while vines can reach 75 feet long. Herbalists originally used the roots and flowers as a diuretic, cathartic, and a tonic for removing stones in the bladder.
Hydrangea (Hydrangea petiolaris).
Hydrangea (Hydrangea petiolaris).
Wild Hydrangea (Hydrangea arborescens).
Wild Hydrangea (Hydrangea arborescens).

Hydrangea Allergy Info

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Some reports associated hydrangea pollen with hayfever, but allergenic potential of this pollen is not well studied.

Hydrangea Pollen Description

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Grains are prolate to subprolate; the amb rounded-triangular and 3-colpoeate. The grains are syncolpate and the ora is faint and lalongate. The sexine is reticulate; the lumina polygonal and smaller toward the apertures.
The grains are 15-17 x 10-14 micrometers in size.

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
Hydrangea (Hydrangea) is a genus of the HYDRANGEACEAE family.
This genus includes the following allergenic species:

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Hydrangea 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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