Helianthus L.

Cypselas compressed, finely pubescent Small shrubs or herbs Helianthus
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 Helianthus annus
Leaves mostly opposite, ovate to oblong, serrato-dentate, up to 16 cm long, 5–8 cm wide; petioles winged. Rays yellow. Disc florets yellow. Heads numerous in a corymb, mostly 5–8 cm diam. Erect perennial up to 3 m high, with edible root tubers. Occasional near habitation. Introd. from America. Fl. summer. Jerusalem Artichoke Helianthus tuberosus