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Fruit oblong to ovate, glabrous, with slender equal ribs, numerous oil-tubes, and depressed or cushion-like stylopodium.—Glabrous perennials, with ternately or pinnately compound leaves, involucre and involucels scanty or none, and white or yellow flowers.

The base of the styles is frequently thickened and cushion-like, and called the stylopodium.

Fruit oblong, with slender ribs, no oil-tubes, and prominent flat stylopodium.

Fruit ovate or oblong, flattened laterally; stylopodium conical; prickles barbed or hooked; seed-face deeply sulcate.

Glaucous, 1–3° high, slender, branching; leaves 2–3-ternate, with lanceolate to ovate entire leaflets; flowers yellow; fruit broadly oblong, 2´´ long; stylopodium small or wanting.