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Crab Grass (Digitaria)

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Home « Michigan « Livingston « Digitaria

Crab Grass Genus Details

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Crabgrass is an annual grass which grows fast in hot, dry weather. The branching heads of this grass look like a crab with many legs. Crabgrass is found throughout the U.S. in lawns, road sides and other waste areas. Crabgrass is naturalized here after being introduced from Europe. Strawberry growers use crabgrass as a natural mulch to substitute for straw. The grass protects the plants during the winter and when berries set in the spring, the layer of dead grass keeps berries out of the dirt.
Crab grass (Digitaria genus)
Crab grass (Digitaria genus)
Crab grass (Digitaria genus)
Crab grass (Digitaria genus)

Crab Grass 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.

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

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Crab 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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