Verbesina alternifolia (formerly Actinomeris alternifolia); Asteraceae (aster family)
Like its close relative tall coneflower (fotd 8/21), wingstem has a central cone of disc flowers surrounded by reflexed ray flowers (petals). The cone looks quite different, though.
Another difference between the two species is the one that gives this plant its common name. Look closely at a stem and you’ll see that it’s lined with leaf tissue. This is a not uncommon occurrence with petioles (the leaf stem), but much less common with a plant’s main stem.
Wingstem grows very tall and loves riverbanks and moist places, just like tall coneflower, but blooms a bit later. It can be found through much of the eastern and midwestern US.
Here’s a closeup of the disc flowers: