Search By Location 
 

Alder (Alnus)

section divider
Home « West Virginia « Clay « Alnus

Alder Genus Details

section divider
Alders are deciduous trees or large shrubs that often grow together in moist soils in wooded areas of North America. All species have separate drooping male and upright female flowers on catkins of the same plant. Flowering precedes the opening of leaf buds and usually occurs during January to April depending on latitude and elevation.
European Alder (Alnus glutinosa).
European Alder (Alnus glutinosa).
Speckled Alder (Alnus incana).
Speckled Alder (Alnus incana).

Alder Allergy Info

section divider
All species have windborne pollen which has been reported to be a significant allergenic cause. People sensitive to one alder species are usually sensitive to all species.

Alder Pollen Description

section divider
Pollen grains of Alnus are oblate to oblate-spheroidal and usually 4-5 porate. Their exinous thickened bands that extend in pairs from aperture to aperture distinguish the grains.
Pollen grains vary in size from 19-21 x 23-30 micrometers.
Alnus rugosa, single grain
Alnus rugosa, single grain
Alnus rugosa, multiple grains
Alnus rugosa, multiple grains

Species in This Genus

section divider
Allergenicity Legend:
Mild Allergen Mild Allergen  |  Moderate Allergen Moderate Allergen  |  Severe Allergen Severe Allergen  |  Allergy Test Allergy Test Available
Alder (Alnus) is a genus of the BETULACEAE family.
This genus includes the following allergenic species:

Allergens and Plants Search

section divider Enter a full or partial species name to find more information on one of over 1200 potentially allergenic plants. For example, you can find chenopods searching on "cheno" (no quotes) as Latin Name.

Search By Plant Name:
 
 Common Name    Latin Name

Search By Alphabet:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Advertisement

Alder Genus Location

section divider
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

Related Links

section divider
Advertisement
facebook_twitter

Advertisement