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canvas prints nature canvas prints allergen canvas prints allergic reaction canvas prints allergic rhinitis canvas prints ambrosia canvas prints ambrosia artemisiifolia canvas prints annual ragweed canvas prints asteraceae canvas prints asterales canvas prints asterids canvas prints biological canvas prints biology canvas prints bitterweed canvas prints botanical canvas prints botany canvas prints

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Coloured scanning electron micrograph (SEM) of ragweed (Ambrosia psilostachya) pollen, showing the tips of the grains. Ragweed is a main cause of weed allergies. Ragweed pollen is notorious for causing allergic reactions in humans, specifically allergic rhinitis. Up to half of all cases of pollen-related allergic rhinitis in North America are caused by ragweeds. A single plant can produce one billion pollen grains per season. Ragweed grows abundantly throughout the South, North, and Midwest, and its lightweight pollen grains can travel up to 400 miles in the wind.

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