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Blue Grass (Poa)

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Blue Grass Genus Details

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These grasses, commonly called blue or June grasses, are low to moderately tall slender perennials or annuals, usually with open seed heads and flat leaf blades. This genus has about 64 species or types in the U.S. in temperate and cold regions. Most species are used for forage or as lawn grasses. Flowering usually occurs in May to June with Canada bluegrass (P. compressa) blooming in June to August. Annual bluegrass (P. annua) is a low spreading grass that was introduced from Europe and is now naturalized in North America. Canada or wire grass, is a low perennial native to Europe, with blue-green stems and narrow seed heads. Plants shed large amounts of pollen during June to August which can cause serious pollinosis. Kentucky bluegrass, (P. pratense), a common lawn grass native to Europe, is a slender perennial that is 1 to 3 feet in height with flat, narrow leaves and a spreading seed head. This bluegrass is one of the most serious hayfever grasses in northern areas of the U.S. Rough bluegrass, (P. trivialis), a perennial with an erect, rough stem, resembles Kentucky bluegrass and is commonly not distinguished from Kentucky bluegrass in literature. Pollen shed is greatly reduced when blue grass in lawns is frequently cut to prevent flowering.
Blue grass (Poa annua)
Blue grass (Poa annua)


Blue Grass Allergy Info

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This is one of the more significant grass types in terms of allergy.

Blue Grass 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
Blue Grass (Poa) is a genus of the POACEAE family.
This genus includes the following allergenic species:

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Blue Grass 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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