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Madrone (Arbutus)

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Madrone Genus Details

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The Pacific madrone has been called one of the best broad-leaved evergreen trees. It is native from British Columbia to California and bears small white flowers like those of Vaccinium (blueberry) in pyramidal clusters of 3-9" tall and 6" broad during the month of May. The red to orange colored berries are displayed in the fall and winter, and it frequently grows in a picturesque shape. The old bark peels off, leaving the younger bright red to cinnamon bark underneath. The dark, glossy evergreen leaves are 2-6" long. Madrone can grow to 60" tall.

Madrone Allergy Info

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The heath family, of which madrone is a member, has been infrequently reported as a source of pollen allergy.

Madrone Pollen Description

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Pollen grains of Arbutus are united into tetrads. They are usually 3-colporate or indistinct. The furrows are distinct and transverse and the exine is psilate. The intine is thickened at the apertures.
Compared to other genera in this family, the tetrads of Arbutus are comparatively large (48-56 micrometers).

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
Madrone (Arbutus) is a genus of the ERICACEAE family.
This genus includes the following allergenic species:

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Madrone 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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