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Lanceleaf Ragweed



Ambrosia bidentata




Common: Southern Ragweed


Minnesota, Iowa, Missouri, Kansas, Oklahoma, Texas, Louisiana, Arkansas, Illinois, Indiana, Tennessee, Alabama, Kentucky, Ohio, Georgia, South Carolina, North Carolina, Virginia, West Virginia, Maryland, New Jersey, New York, and Connecticut


Lanceleaf Ragweed is an annual herb that grows up to 40 inches tall. The leaves have comparatively fewer lobes than related ragweed species such as short ragweed, sometimes having no lobes at all. The plant is wind-pollinated, and the small flower heads develop into spiny burs as the seeds ripen. Pollination occurs in mid-summer to mid-fall. Field identification is simplified because of the sharply pointed basal lobes present on many of the leaves and the single terminal spike of staminate flowers. Preferred habitats are prairies, fields, waste ground, pond margins, pastures, roadsides, and railroads. Lanceleaf Ragweed pollen is highly cross-reactive with short and giant ragweed pollen.