Leaves: Opposed, about 6 cm length, toothed, simple, no hairs, small stalks
Flower: yellow, 18 petals
Could be a hybrid because petioles are short but distinct.
Stiffed leaf Woodland sunflower
Helianthus divaricatus, commonly known as the woodland sunflower or rough woodland sunflower, is a perennial herb in the composite family. It is native to eastern North America, from Ontario and Quebec in the north, south to Florida and west to Oklahoma and Iowa.