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Plant Allergy Overview
Allergenicity
Severe
Pollen Season
Summer Fall
Type
Weed
Sub-Type
Annual
Allergy Information
Russian thistle is a member of the Goosefoot family, which is a frequent cause of allergy for some.
Genus Details
Russian thistle is an annual herb with dry spine-tipped leaves. It is widely branching and has small flowers. The plant is commonly found in disturbed areas, along roadsides and in pastures. Old plants often break off and become “tumbleweeds”.
Pollen Description
The pollen grains are spheroidal with large pores and a thick exine. The pollen grains are similar to those of the Amaranthaceae family.
Pollen grains are usually 27-30 micrometers in diameter.
Genus Distribution
The shaded areas on the map indicates where the genus has been observed in the United States.
- Native, observed in a county - Introduced, observed in a county - Rarely observedSpecies in Russian-Thistle Genus
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