Helianthus petiolaris
Family: Asteraceae
petioled sunflower, plains sunflower, prairie sunflower
Helianthus petiolaris image
Robert R. Kowal  
Etymology: Helianthus: derived from two Greek words helios, "sun," and anthos, "flower," in reference to the sunflower's supposed tendency to always turn toward the sun
Plants: annual forb
Conservation Status: Native