Sigesbeckia orientalis, 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

1. S. orientalis L. , Sp. Pl. 900 (1753).

Up to 120(-190) cm, pubescent. Leaves triangular-hastate, acute at apex, cuneate at base, irregularly dentate or lobed, the petiole tapering from above and more or less unwinged in its lower part, not amplexicaul. Capitula 6-9 mm across (excluding outer involucral bracts); outer involucral bracts 7-15 mm, linear-spathulate; stalked glands present on outer and inner involucral bracts and often on peduncle. 2n = 60. Naturalized in waste places and by railways in S. Romania', casual elsewhere. [?It Rm.] (Warm temperate and tropical regions of the Old World.)