Ageratina Spach
Florets white Ageratina
Leaves rhomboidal, glandular hairy; blades almost as broad as long, hastate, serrate, conspicuously veined, up to 10 cm long, with long petioles. Cypselas glabrous. Perennial herb 1–2 m high. Widespread. Weed in moist places. Introd. from America. Fl. spring. Crofton Weed Ageratina adenophora
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 Ageratina riparia