Bidens bipinnata, L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 140

8. B. bipinnata L. , Sp. Pl. 832 (1753).

Almost glabrous annual 10-100 cm. Leaves petiolate, pinnate, with up to 4 pairs of pinnae, the lower of which are lobed almost to the midrib; lobes rhombic to broadly lanceolate, entire or coarsely toothed, sparsely hairy on the veins beneath. Capitula 5-10 mm in diameter, longer than wide; outer involucral bracts shorter than inner, herbaceous, all lanceolate to oblong. Receptacular scales shorter than the achenes, linear, scarious, with dark lines. Outer achenes 8-10 mm, the inner 10-18 mm, linear, papillose, with few, short, erect setae; bristles 2-3, 2-4 mm, erecto-patent at maturity. Fields and roadsides. Naturalized in S. & S. C. Europe. [Ga He It Ju.] (South America.)