Flora of Oregon

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.

Species, subspecies and varieties