Helianthus decapetalus
ten-petaled sunflower
 
"Helianthus decapetalus, known by the common names ten petal sunflower, thinleaf sunflower and thin-leaved sunflower, is a perennial forb in the sunflower family. It is native to the Eastern and Central United States and Canada, from New Brunswick west to Iowa, Wisconsin, and Ontario, south as far as Georgiaand Louisiana. It produces yellow composite flowers in late summer or early fall.The name decapetalus means "with ten petals", referring to the 8-12 ray florets on the flower heads, resembling petals."
 
Plants can be purchased in-person or online (with in-person pick-up). 
All online orders will be ready for pick-up 24-72 hours after purchase. You will receive an email to let you know when your order is ready. We kindly ask that you pick-up any orders within one week of purchase. 
 
Info from wikipedia.
Photo crecdit to Tim Gibson