Allergy Information

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

Genus Details

Blue grama grass is a cool season grass which is found in Northern U.S. and Canada. Blue grama grass is rather short, and has round stems with narrow blades, growing extensively in the plains region of the U.S. It is used frequently for livestock grazing and distributed as hay for the same purpose. If allowed to flower, small spiklets appear on top of the blade. This grass is a heavy pollen producer. The pollinating months are July-September.

Pollen Description

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.

Genus Distribution

The shaded areas on the map indicates where the genus has been observed in the United States.

- Native, observed in a county 

- Introduced, observed in a county 

- Rarely observed