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St. Augustine Grass (Stenotaphrum)

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St. Augustine Grass Genus Details

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St. Augustine grass is an alien lawn grass that is cultivated from South Carolina to Texas and California. This turf grass escaped cultivation and became established in moist, mucky soils in waste sites. This coarse, broad-leafed grass is a low, creeping, perennial plant with short, flowering stalks. The leaves are 6 inches long and 1/3 inch wide. It is one of the best grasses for establishing lawns in warm tropical climates. Flowering and pollen shed occurs continuously from spring to fall but little pollen becomes airborne. This thick turf commonly contains a mold (Helminthosporium) that releases airborne allergenic spores when the grass is cut.

St. Augustine Grass Allergy Info

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This genus is not commonly cited as a significant source of allergy in the US. However, it has become established in waste sites where pollen shed may be sufficient to cause midsummer allergy problems. Although reported in international literature as allergenic, this genus has been reported in Texas to rarely cause allergy problems.

St. Augustine 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. Pocaceae 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
St. Augustine Grass (Stenotaphrum) is a genus of the POACEAE family.
This genus includes the following allergenic species:

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St. Augustine 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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