ALLERGY AND ASTHMA IN THE SOUTHWESTERN UNITED STATES 
perennial ryegrass image Lolium perenne
Perennial Rye Grass

 

Flowering period in Southern Arizona: March - October.  Widely distributed through North America.  Pollen contains allergens common to most other grass species.

Photo by J.R. Manhart, Texas A&M University Bioinformatics Working Group
Vascular Plant Image Gallery
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