Eutrochium dubium is a perennial herb, 40-100 cm tall, stem with purple speckles, sticky-hairy near top.
Leaves in whorls of 3-4, short-stalked, blade 5-12 cm long, 2-7 cm wide, thick, egg-shaped, tip pointed, base abruptly contracted, margin coarsely toothed, strongly 3-veined.
Flowers dull purple 5-8 per head, no rays, basal bracts narrow, in several rows; inflorescence dense, convex, not large; blooms July-Sept.
Fruit dry, 1-seeded, 5-angled plumed achene about 0.4 cm long. Eaten by some birds (Martin et al. 1951).
Wetland status: FACW.
Frequency in NYC: Infrequent.
Habitat: Open, wet areas, prefers acid soil.