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Elm (Ulmus)

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Elm Genus Details

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The towering elm is located throughout the United States. Elms have simple, alternate leaves and distinctive wafer-like fruits called samaras. The leaves are usually rough textured and lopsided at the base. Elms generally flower at two distinct times. The majority of elms begin flowering in January or February in the southern latitudes and as late as April in the northern regions. There are also a few species of late flowering elms in the southern states, which flower during the late summer and occasionally into November. Elms are wind-pollinated, flowering before leaves appear for the season. Individual seeds are enclosed in a thin, papery casing, carried well by the wind.
American elm (Ulmus americana)
American elm (Ulmus americana)
American elm (Ulmus americana)
American elm (Ulmus americana)

Elm Allergy Info

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Elms are a major source of allergy. Fall pollinating elms tend to be more allergenic in studies than spring pollinating elms but both are significant.

Elm Pollen Description

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Grains are suboblate to spheroidal; the amb from oblate-spheroidal to angular and square. They contain 4-6 elliptical pores and the exine is thick and rugulate.
Grains are usually 16-50 x 18-50 micrometers.
Ulmus genus, single grain.
Ulmus genus, single grain.
Ulmus genus, multiple grains.
Ulmus genus, multiple grains.

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
Elm (Ulmus) is a genus of the ULMACEAE family.
This genus includes the following allergenic species:

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Elm 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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