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Amaranth, Pigweed, Tumbleweed (Amaranthus)

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Amaranth, Pigweed, Tumbleweed Genus Details

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Pigweed is an annual herb that grows throughout the U.S. in agricultural fields and recently disturbed soils. Plants grow to 28 feet tall, and leaves are a dull green. The flowers are dense, and sometimes showy. In pollen counts, pigweed is often interchanged with the plant called lamb’s quarters (Chenopodium) for a few reasons. Flowering and pollen shed occurs at the same time and the pollen grains look the same to analysts conducting pollen counts through their microscopes. Common names for these plants are also used interchangeably depending on where you are in the country. Late summer to autumn is usually the peak time for the sparce pollen shed.
Pigweed (Amaranthus genus).
Pigweed (Amaranthus genus).
Pigweed (Amaranthus genus).
Pigweed (Amaranthus genus).

Amaranth, Pigweed, Tumbleweed Allergy Info

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Pollen is usually considered a significant cause of pollinosis, but varies among species within this genus. It is thought that there is considerable cross reactivity among the species within this genus.

Amaranth, Pigweed, Tumbleweed Pollen Description

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Pollen grains are spheroidal and have between 30-65 pores. The exine is thin and granular. The various species of Amaranthus are difficult to tell apart using a light microscope.
Grains are 18-31 micrometers in diameter.
Amaranthus hybridus, single grain. Herb MIN.
Amaranthus hybridus, single grain. Herb MIN.
Amaranthus hybridus, multiple grains. Herb MIN.
Amaranthus hybridus, 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
Amaranth, Pigweed, Tumbleweed (Amaranthus) is a genus of the AMARANTHACEAE family.
This genus includes the following allergenic species:

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Amaranth, Pigweed, Tumbleweed 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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