Helenium flexuosum is a North American plant species in the daisy family known by the common name purple sneezeweed. It is widespread across much of eastern and central United States and Canada, from Nova Scotia west to Ontario, Minnesota, and Kansas, south to Florida, Louisiana, and eastern Texas.Helenium flexuosum is a perennial herb up to 100 cm (40 inches) tall. One plant can produce 80 or more flower heads in a branching array.