Ambrosia artemisiifolia, common ragweed, is the most widespread plant of the genus Ambrosia in North America. It has also been called annual ragweed, bitterweed, blackweed, carrot weed, hay fever weed, Roman wormwood, stammerwort, stickweed, tassel weed, and American wormwood. It is native in North America. The species name, artemisiifolia, is given because the leaves were thought to bear a resemblance to the leaves of Artemisia, the true wormwoods.
Common ragweed grows to about one meter (3 feet) in height. Its wind-dispersed pollen is a strong allergen to many people with hay fever. Common Ragweed emerges in the late spring, and sets seed in later summer or fall. Ambrosia artemisiifolia is used in phytoremediation projects, removing heavy metals such as Lead from the soil.
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