Senecio viscosus, 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 : 204

64. S. viscosus L. , Sp. Pl. 868 (1753).

Very viscid, foetidannual up to 60 cm, usually freely branched, with somewhat flexuous stems. Leaves dark green, densely glandular-hairy, deeply and regularly pinnatifid; basal and lower cauline obovate in outline, shortly petiolate; middle and upper cauline oblong in outline, sessile but not or scarcely amplexicaul. Capitula numerous, 6—10(—12) mm in diameter, in a large, irregular terminal corymb. Involucral bracts 8-11 mm, densely glandular; supplementary bracts 3 or 4, 2-4 mm; all usually concolorous. Ligules c. 13, short and often becoming revolute, yellow. Achenes 3-4 mm, glabrous. 2/7 = 40. Waste ground, railway-lines and other open sandy or gravelly habitats. From the Netherlands and N. C. Russia southwards to C. Spain and Greece, but absent from most of the south-east; recently naturalized in parts ofN. & W. Europe. Al Au Be BI *Br Bu Cz Ga Ge Gr He Ho Hs Hu It Ju Po Rm Rs (B, C, W) Si [Da Fe Hb No Rs (N) Su].