Sigesbeckia 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

42. Sigesbeckia L. 1

Annual herbs; stems erect, usually dichotomously much-branched. Leaves opposite. Capitula small, in lax panicles or rarely solitary; outer involucral bracts linear to linear-spathulate, patent, usually much longer than the inner, with stipitate glands. Outer florets with short ligules, female, yellow; inner florets tubular, hermaphrodite, subtended by receptacular scales; pappus absent.

Literature: H. Henker, Arch. Freunde Naturgesch. Mecklenb. 11: 7-54 (1965).

Leaves triangular-hastate, irregularly dentate or lobed, the petiole tapering from above and ± unwinged in its lower part, not amplexicaul 1. orientalis

Leaves broadly ovate to cordate, shallowly and regularly crenate or serrate, the petiole broadly winged to the base and + amplexicaul 2. jorullensis