Fall Allergens in Idaho 

1. annual ragweed (Ambrosia artemisiifolia)

2. douglas' wormwood (Artemisia douglasiana)

3. flat-spine burr-ragweed (Ambrosia acanthicarpa)

4. oldman (Artemisia absinthium)

5. white sagebrush (Artemisia ludoviciana)

6. prairie koeler's grass (Koeleria macrantha)

7. spreading bent (Agrostis stolonifera)

--Source: pollenlibrary.com

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