Herbs perennial.
Roots taprooted.
Stems erect, hollow.
Leaves basal and cauline, compound, 2–3-ternate-pinnate, triangular-ovate in outline, margins serrate and occasionally lobed; leaflets wide; sheaths slightly to prominently inflated; petioles short to well-developed.
Inflorescences terminal or axillary compound umbels; peduncled; involucres absent; rays 5–65; involucel bractlets 0–15.
Flowers sepals 0 or minute; petals obovate, white, rarely pink to purple, tips rounded.
Fruits oblong to round, flattened or not, glabrous to hairy; ribs unequal; marginal wings wider than or equal to others.
Circumboreal. ~60 species; 6 species treated in Flora.