Hairless, annual herbs. Leaves thinly textured; upper finely dissected, the lower (in our species) only lobed. Inflorescence of terminal and lateral compound umbels. Bracts 0; bracteoles few. Calyx teeth unequal. Rays relatively few. Petals white to pinkish; tip inflexed; outer petals radiate. Ovary glabrous. Fruit hairless, subspherical, not flattened. Ridges low.