ragweed is a topic covered in the Taber's Medical Dictionary.

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Any of approx. 50 species of flowering plants of the genus Ambrosia, in the aster family (Asteraceae) whose pollen is an important allergen. The pollen-producing period of grasses in temperate zones is from the middle of August to the first hard frost. Ambrosia allergens are abbreviated Amb by the World Health Organization.
SEE: allergy

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