*Helianthus annus L.

Leaves mostly alternate, mostly ovate and serrate, up to 20 cm long and 10 cm wide. Stems often mottled. Heads 3–10 cm diam. (larger in cultivated plants). Rays yellow. Disc florets brownish purple. Cypselas 1–2 cm long. Erect annual up to 3 m high. Commonly cultivated. Widespread. Garden escape near habitation; roadsides. Introd. from America. Fl. summer. Sunflower