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Maple, Box Elder (Acer)

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Maple, Box Elder Genus Details

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Maples are trees and shrubs with worldwide distribution, of which 13 species are native to US. Almost all maples are deciduous with distinct, palmate leaves (with parts diverging from a common base, as the fingers of a hand). The leaf is used as a logo for the Toronto Mapleleafs hockey team. Fruit are paired, winged seeds, known as samara. Many maples are popular for ornamental and street plantings. Acer negundo (box elder) differs from other maples in that its leaves are pinnately compound (separate leaves diverge from one central stem), and in that it has male and female flowers on separate trees that are entirely wind-pollinated. Trees reach 30-100 feet in height and 2-4 feet in diameter. In the U.S. flowering usually occurs in early spring through April or May, but can begin in January and February for sugar maples and other species, with a few species in W. U.S. flowering in June and July.
Box elder (Acer negundo).
Box elder (Acer negundo).
Japanese maple (Acer palmatum)
Japanese maple (Acer palmatum)

Maple, Box Elder Allergy Info

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All maple species are potentially allergenic. Box elder, which is primarily wind-pollinated, has significantly allergenic pollen. Silver maple has a secondary allergic importance except where very abundant. The other maples appear to cause fewer problems.

Maple, Box Elder Pollen Description

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Grains vary in shape from prolate to spheroidal; the amb rounded-triangular with convex sides, and 3-colpate or 3-colporate. The colpi are long with tapering, blunt or rounded ends. Pollen grains of Acer negundo (box-elder) have a distinct rugulate-undulating sexine.
The pollen grains vary in size, depending on the species and can vary in size from 30-51 micrometers x 20-36 micrometers to 22-26 x 20-36 micrometers in diameter.
Acer negundo (box elder), multiple grains. Herb. MIN
Acer negundo (box elder), multiple grains. Herb. MIN
Acer genus (maple type), multiple grains. Herb. MIN
Acer genus (maple type), 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
Maple, Box Elder (Acer) is a genus of the ACERACEAE family.
This genus includes the following allergenic species:

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Maple, Box Elder 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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