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Leaves large, incubous, complicate-bilobed; lower lobe ligulate, suberect; underleaves similar, decurrent at base, the apex entire.

Head many-flowered; ray-flowers in several rows, narrowly ligulate, pistillate, fertile; disk-flowers with undivided style, sterile.

Corolla ligulate in all the flowers of the head, and all the flowers perfect.—Herbs, with milky juice.

Heads many-flowered, somewhat diœcious; in the substerile plant with a single row of ligulate pistillate ray-flowers, and many tubular sterile ones in the disk; in the fertile plant wholly or chiefly of pistillate flowers, tubular or distinctly ligulate.

Rays present; i.e. the marginal flowers or some of them with ligulate corollas.