Vernonia noveboracensis
from the link ☼
This species of ironweed (sometimes commonly called New York ironweed) is a tall, coarse, upright perennial which typically occurs in the wild in moist thickets, low areas and along streambanks from Massachusetts to Mississippi. Features numerous tiny, fluffy, deep purple, composite flowers (rays absent) in loose, 3-4" wide, terminal clusters (cymes) atop stiff, leafy stems typically growing 4-6' tall. Somewhat suggestive of Joe Pye weed, except leaves of ironweed are alternate. Blooms late summer into fall. Rough, pointed, serrate, lance-shaped leaves (6-8" long). Flowers give way to rusty seed clusters. The source of the common name has been varyingly attributed to certain "iron-like" plant qualities including the tough stems, the rusty-tinged color of fading flowers and the rusty colored seeds.