Ambrosia bidentata, the lanceleaf ragweed, is a North American species of plants in the family Asteraceae. It is native to the central and eastern parts of the United States, primarily the Mississippi Valley and the eastern Great Plains.Biota of North America Program 2014 county distribution map
Ambrosia bidentata is an annual herb up to 100 cm (40 inches) tall. Leaves have only a few lobes compared to the complexly divided leaves of some related species, sometimes no lobes at all. Flower heads are small and inconspicuous, as the plant is wind-pollinated. The heads develop into spiny burs as the seeds ripen.Flora of North America Vol. 21 Page 15 Ambrosia bidentata Michaux, Fl. Bor.-Amer. 2: 182. 1803.
References
External links Missouri Plants Go Botany, New England Wild Flower Society Pollen Library Illinois Natural History Survey