Herbs perennial, glabrous.
Roots fibrous or tuberous, occasionally rooting from nodes.
Stems decumbent to ascending.
Leaves cauline and basal, (1)2(3)-pinnately compound; sheaths not inflated; petiolate.
Inflorescences terminal and axillary compound umbels; involucral bracts 0–4; rays 10–20, usually subequal, sometimes unequal; involucel bractlets 8–20.
Flowers sepals well developed; outer flowers bisexual or staminate; petals white.
Fruits cylindric, ovoid to round, slightly flattened, glabrous; ribs low, broad, corky; wings absent.
Africa, Asia, Europe, North America. ~30 species; 1 species treated in Flora.