Mild Allergen
Moderate Allergen
Severe Allergen

 Ambrosia-Leaf Burr-Ragweed (Ambrosia ambrosioides)  Annual Ragweed (Ambrosia artemisiifolia)  Coastal Ragweed (Ambrosia hispida)  Dwarf Burr-Ragweed (Ambrosia pumila)  Flat-Spine Burr-Ragweed (Ambrosia acanthicarpa)  Great Ragweed (Ambrosia trifida)  Hairy Ragweed (Ambrosia canescens)  Holly-Leaf Burr-Ragweed (Ambrosia ilicifolia)  Lance-Leaf Ragweed (Ambrosia bidentata)  Perennial Ragweed (Ambrosia psilostachya)  Ragweed Sagebrush (Artemisia franserioides)  Rio Grande Ragweed (Ambrosia cheiranthifolia)  San Diego Burr-Ragweed (Ambrosia chenopodiifolia)  Silver Burr-Ragweed (Ambrosia chamissonis)  Skeleton-Leaf Burr-Ragweed (Ambrosia tomentosa)  Slim-Leaf Burr-Ragweed (Ambrosia tenuifolia)  Streaked Burr-Ragweed (Ambrosia linearis)  Triangle Burr-Ragweed (Ambrosia deltoidea)  Tucson Burr-Ragweed (Ambrosia cordifolia)  Weak-Leaf Burr-Ragweed (Ambrosia confertiflora)  Woolly-Fruit Burr-Ragweed (Ambrosia eriocentra)  Woolly-Leaf Burr-Ragweed (Ambrosia grayi)

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