Cyclachaena xanthiifolia (Nutt.) Fresen.

Cyclachaena xanthiifolia (Nutt.) Fresen.. Cyclachaena xanthiifolia, known as giant sumpweed, or rag sumpweed is a North American plant species in the sunflower family, Asteraceae. It is the only species in the genus Cyclachaena. Giant sumpweed is believed to be native to the Great Plains but is now found across much of southern Canada and the contiguous United States, though rarely in the Southeast.