Eupatorium rotundifolium is a perennial herb, 30-150 cm tall, stems stiff, solitary or in twos, most parts finely hairy.
Leaves opposite, stalkless (sessile), blade rounded to broadly egg-shaped, 2-12 cm long, 1-6 cm wide, usually rough above, tip pointed, base blunt, margin toothed, veins palmate at base.
Flowers white, 5 per head, bracteate base 0.5-0.6 cm tall, bracts hairy, minutely glandular, in flat-topped clusters; blooms July-Sept.
Fruit dry, 1-seeded, 5-angled plumed achene.
Wetland status: FAC-.
Frequency in NYC: Very infrequent.
Habitat: Open areas, moist to wet soil.