the boy is allergic to ragweed. in a medical mask, he holds a ra

acacia adult allergen allergenic allergic allergy ambrosia american artemisiifolia background bitterweed blooming blossom blowing botany boy carrot closeup disease fever field flora flower flu green growth harmful hay illness leaf meadow nature pest plant pollen quarantine ragweed season sensitive sickness snuffle spider spring stem stickweed summer tassel weed woman wormwood