White Crownbeard (Wingstem; Frostweed)
Perennial with winged stalks. Wings are extension of leaf tissue. Flowerheads small, clustered terminally, 1–1½ inches across with few (1–5) ray florets, white. Blooms August–October. Leaves alternate, oval to lance-shaped, to 7 inches long, with short fine hairs above and hairier below, also with widely spaced, small teeth.
There are 3 other species of Verbesina in our state, but they all have yellow, not white flowers. One of these, yellow ironweed (V. alternifolia), is also particularly famous as a "frost flower" plant.