Helianthus pauciflorus

Helianthus pauciflorus, called the stiff sunflower, is a North American plant species in the family Asteraceae. It is widespread across the Great Plains, the Rocky Mountains, and the Great Lakes region, and naturalized in scattered locations in the eastern United States and in much of southern Canada.
Stiff sunflower is a perennial herb tall, spreading by means of underground rhizomes. Most of the leaves are attached near the bottom of the stem. One plant can produces 1-10 flower heads, each head with 10-20 yellow ray florets surrounding at least 75 red or yellow disc florets.
Hybrids between H. pauciflorus and H. tuberosus are known as H. × laetiflorus. The name H. laetiflorus has also been used as a synonym of H. pauciflorus.
; SubspeciesHelianthus pauciflorus subsp. pauciflorus: tall; leaves alternate near the end of the stem, long, with tips acuminate.Helianthus pauciflorus subsp. subrhomboideus O.Spring & E.E.Schill.: tall; leaves opposite, long, with acute or obtuse tips.