| Stems stout (sometimes acaulescent). winged by the decurrent bases of the Lvs., which are large, alternate, prickly, dentate or pinnately cut: involucre globose, the bracts imbricated in many series, and in some cases spiny; receptacle flat, fleshy, honeycombed, not bristly; pappus not plumose, but with bristles in several series. —About 12 species, annual and biennial. | | Stems stout (sometimes acaulescent). winged by the decurrent bases of the Lvs., which are large, alternate, prickly, dentate or pinnately cut: involucre globose, the bracts imbricated in many series, and in some cases spiny; receptacle flat, fleshy, honeycombed, not bristly; pappus not plumose, but with bristles in several series. —About 12 species, annual and biennial. |
| + | O. Salteri, Hort. "Plant pyramidal in habit, about 5 ft. high, silvery shining. Lowest Lvs. widely spreading on the ground, incised, spiny, upper reduced." Country unknown. |