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Rye (Secale)

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Rye Genus Details

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This grass is a cool-season grain or cereal crop that is not to be confused with ryegrass, a common allergenic lawn grass. This grain, which is grown worldwide, is not a major crop in North America. This genus has 5 species, which consist of both annuals and perennials. The plants grow up to 5' tall and has simple stems and bluish-green, flat leaves that reach 1/2' wide. Flowering occurs from May to June. The abundant pollen is heavy which restricts its wind dispersal range. The grain is used to make bread and rye whiskey.

Rye Allergy Info

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Although the grass family in general is considered significant allergenically, this genus is not typically considered to be problematic.

Rye Pollen Description

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Grains are spheroidal to ovoidal, sometimes elliptical. The exine is thin and the surface is granular to finely reticuloid. Poaceae apertures are 1-porate, with the pores usually circular to ovoidal.
Grains are 22-122 micrometers in diameter.
This plant belongs to the grass family.  All pollen grains in this family are similar to the Poaceae (grass) grain pictured here. Herb. MIN
This plant belongs to the grass family. All pollen grains in this family are similar to the Poaceae (grass) grain pictured here. Herb. MIN
This plant belongs to the grass family.  All pollen grains in this family are similar to the Poaceae (grass) grains pictured here. Herb. MIN
This plant belongs to the grass family. All pollen grains in this family are similar to the Poaceae (grass) grains pictured here. 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
Rye (Secale) is a genus of the POACEAE family.
This genus includes the following allergenic species:

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Rye 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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