ambrosia artemisiifolia blooming, known as common ragweed, annual ragweed, and low ragweed

abstract allergen allergenic allergic allergy ambrosia ambrosiaartemisiifolia american annual artemisiifolia background bitterweed bloom blooming blossom botany carrot commonragweed dangerous detail disease fever flora flower grass green growth hairy harmful hay hayfever head illness inflorescence leaf lowragweed nature overgrown pinnatifid plant pollen rag ragweed sickness stem stickweed summer tassel weed wormwood