*Bidens pilosa L.

Leaflets serrate or dentate very rarely lobed, stalked, usually 3 but sometimes 5, ovate to lanceolate, 3–6 cm long. Ray white, up to 1 cm long, sometimes absent. Heads few, mostly terminal on slender peduncles. Involucre cylindrical, c. 6 mm diam.; outer bracts herbaceous; inner ones bordered with a white thinnish margin. Erect, glabrous or hairy herb up to 2 m high, sometimes woody towards the base, with angular branches. Widespread. Weed of cultivation and waste places. Introd. from S. America. Fl. spring–summer. Cobbler’s Pegs. Benson (2007) indicates that this species may be native to Australia