Types of Pollens
Tree Pollens and Allergies
Not every kind of tree produces pollen that causes nasal allergies. But enough do to make seasonal allergies from tree pollens a major health issue.
Common Allergy-Producing Trees
- box elder
- mulberry (nonfruiting)
- sweet gum
Grass Pollens and Allergies
Grass pollen is a common allergen. Yet of the more than 1,000 types of grass that grow in North America, only a few produce pollens that trigger nasal allergies.
Common Allergy-Producing Grasses
- blue (especially Kentucky)
- sugar beet
- sweet vernal
- wild oats
Weed Pollen and Allergies
Weeds are the largest source of allergy-triggering pollens in North America. In late summer and early fall in North America, ragweed pollen is the number one cause of hay fever. A single ragweed plant can produce millions of grains of allergy-producing pollen.
Common Allergy-Producing Weeds
- mash elder
- Russian thistle (tumbleweed)
- sages (mugworts)
- sheep sorrel
For more information about allergies and pollens, see the next page.
ABOUT THE AUTHOR
Written by Karen Serrano, MD Emergency Medicine resident at the University of Wisconsin-Madison.
Reviewed by Lisa V. Suffian, MD
Instructor of Clinical Pediatrics in the Division of Allergy and Pulmonary Medicine at Saint Louis Children's Hospital, Washington University School of Medicine
Assistant Clinical Professor in the Department of Pediatrics at Cardinal Glennon Children's Hospital, Saint Louis University
Board certified in Allergy and Immunology
Last updated June 2008