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Tansy (Tanacetum)

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Tansy Genus Details

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About 50 species of Tanacetum are native to the Northern Hemisphere. Tansy are plentiful, tall perennial plants (up to 4 feet tall) with very aromatic leaves. The flat-topped clusters of yellow, button-like flowers can cause allergic reactions in some individuals. Leaves are alternate and highly divided. Plants may flower from May to October where onset and duration will vary depending on latitude and altitude. Artemisia, an important source of allergenic pollen second to ragweed and grasses, is in the same plant family (Asteraceae) as tansy. Pollination is primarily by insects, but this genus may be incidentally wind-pollinated. Parts of the plant are poisonous if eaten in large amounts.

Tansy Allergy Info

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This genus is not commonly cited as a source of respiratory allergy. However, it does shed large amounts of pollen, and is related to other notorious offenders (ragweed and sage).

Tansy Pollen Description

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Baccharis pollen grains are oblate-spheroidal to prolate-spheroidal; the amb triangular, 3-4 lobate and 3-4 colporate. The sexine is generally thick, tectate, and has long spines. The intine is thin but slightly thickened below the apertures. Tanacetum has pollen grains of the Baccharis-type.
The grains are typically 20-30 micrometers in diameter.
Baccharis halimifolia, single grain. Herb. MIN.  Tanacetum has pollen grains of the Baccharis-type.
Baccharis halimifolia, single grain. Herb. MIN. Tanacetum has pollen grains of the Baccharis-type.
Baccharis halimifolia, multiple grains.  Herb. MIN. Tanacetum has pollen grains of the Baccharis-type.
Baccharis halimifolia, multiple grains. Herb. MIN. Tanacetum has pollen grains of the Baccharis-type.

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
Tansy (Tanacetum) is a genus of the ASTERACEAE family.
This genus includes the following allergenic species:

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Tansy 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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