Helianthus schweinitzii is a perennial wildflower endemic to the Piedmont physiographic province of North Carolina and South Carolina. Its common name is Schweinitz's sunflower. It is a member of the Sunflower Family (Asteraceae). It is one of the rarest species of sunflower in the United States. It is common along utility and highway rights-of-way in North Carolina and South Carolina. There are only about 90 known populations, many containing less than 40 plants each. The U.S. Fish and Wildlife ...