Bidens cernua, 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

5. B. cernua L. , Sp. Pl. 832 (1753).

Glabrous or somewhat pubescent annual (4-)10-90 cm. Leaves linear-lanceolate to lanceolate, acuminate, coarsely and remotely serrate, unlobed, sessile. Capitula 15-25 mm in diameter (without ligules), nodding, wider than long; outer involucral bracts 5-8, leaf-like, the inner ovate, scarious with dark lines. Ligules often present. Receptacular scales as long as the achenes, oblanceolate, scarious, with dark lines. Achenes 6-8 mm, cuneiform; marginal setae deflexed; bristles 3-4. In = 24. Damp places. Much of Europe, but absent from the extreme north and much of the Mediterranean region. Al Au Be Br Bu Cz Da Fe Ga Ge Gr Hb He Ho Hs Hu It Ju No Po Rm Rs (N, B, C, W, K, E) Su.