Allergy Information

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

Genus Details

This is an allergenically significant grass genus, flowering in early summer - June to July. 3-12 inches tall, vernal grass tends to grow in fields, roadsides, and waste places.

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