boy holds bouquet of ragweed . child playing gives sniff of dangerous ambrosia artemisiifolia to brother. weed bursages and

agent allergen allergenic allergic allergy ambrosia apples autumn background bitterweed bloom blooming botany burrobrushes bursages care dangerous fever field flora floral flower flowering garden grass green growing growth hay health healthcare healthy inflorescence leaf natural nature outdoors plant pollen ragweed season seed stem summer toxin weed