*Ageratina riparia (Regel) R.M.King & H.Rob.

Leaves lanceolate, hairy but not glandular hairy, much longer than broad, serrate, up to 10 cm long, petiolate. Cypselas hairy. Perennial herb up to 1 m high. Widespread. Weed in moist places. Introd. from America. Fl. spring. Mist Flower