Volutaria Cass.

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 : 253

133. Volutaria Cass. 1

Annuals. Capitula solitary or in pairs at apex of branches, small. Involucre ovoid; bracts imbricate, in few rows, with shortly decurrent, acute, mucronate apical appendage. Marginal florets sterile, radiate. Filaments hairy. Achenes ribbed, pitted between the ribs, pubescent, the apex with a denticulate margin; pappus in 2 subequal rows, the outer of setae, the inner of scales.