Ageratina aromaticum is a perennial herb to 80 cm tall, much like A. rugosum, leaves smaller, thicker.
Leaves opposite, very short-stalked, blade 3-7 cm long, 2-5 cm wide, thick, firm, tip blunt to pointed, margin blunt-toothed (crenate).
Flowers white, 10-19 per head, no rays, basal bracts blunt to pointed; blooms Aug-Oct.
Fruit dry, small, 1-seeded, 5-angled plumed achene.
Wetland status: UPL.
Frequency in NYC: Very infrequent.
Habitat: Dry woods.