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Smotherweed (Bassia)

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Smotherweed Genus Details

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Smotherweed leaves are alternate, simple and rough feeling. Flowers are found in small clusters collected in spiked panicles (flowering structures). Smotherweed was introduced from Eurasia and is now found all over the U.S., where it grows as an annual. Pollen is abundant and is wind disseminated. Generally it is worse in the summer month (June-July). This is one of the last weeds to be killed by autumn's frosts and is also considered an indicator of good soil.

Smotherweed Allergy Info

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Pollen is abundant and is wind disseminated. Due to the fact that russian pigweed is a member of the chenopod family, a particularly allergenic plant group, it is likely a cause of allergy.

Smotherweed Pollen Description

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The pollen grains of these families are spheroidal and pantoporate; the pores 20-65 per grain, usually circular, either globally distributed or in luminoid areas separated by muroid ridges; and the opercular granular. The sexine is often tegillate, undulating with a granular surface that is spinulose. The nexine is as thick as or often thinner than the sexine and the intine is generally thick or indistinct.
The pollen grains are 14-50 micrometers in diameter.
This plant is a member of the Chenopodiaceae pollen type group.  This chenopod pollen grain photo represents all members of this group.
This plant is a member of the Chenopodiaceae pollen type group. This chenopod pollen grain photo represents all members of this group.
This plant is a member of the Chenopodiaceae pollen type group.  This chenopod pollen grain photo represents all members of this group.
This plant is a member of the Chenopodiaceae pollen type group. This chenopod pollen grain photo represents all members of this group.

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
Smotherweed (Bassia) is a genus of the CHENOPODIACEAE family.
This genus includes the following allergenic species:

Allergens and Plants Search

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Smotherweed 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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