Common ragweed, Ambrosia artemisiifolia, plants against blue sky. Ragweed pollen is a seasonal allergen.

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The pollen from ragweed is highly allergenic. It is the primary cause of autumn hayfever seasonal allergies. A common misconception is that goldenrod causes hayfever, but it is insect pollinated so it does not. The pollen from ragweed stamens is carried on the wind.

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Keywords: allergen, allergenic, allergies, ambrosia, anemophilous, angiosperm, artemisiifolia, asteraceae, autumn, blue, common, fall, fever, flowering, hay, hayfever, plant, pollen, pollinated, rag, ragweed, seasonal, sky, weed, wind