Description from Flora of China
Herbs, perennial. Stem hollow, ribbed, base without fibrous remnant sheaths. Leaves petiolate, base sheathing; blade 2–3-pinnatisect or 2–3-ternate-pinnatisect. Umbels compound, terminal and lateral; bracts absent or few; bracteoles numerous, linear. Calyx teeth obsolete. Petals white, ovate or obovate, apex incurved. Stylopodium low-conic to conic. Fruit oblong to ovoid, dorsally compressed, glabrous; dorsal ribs prominent, lateral ribs broad membranous-winged; vittae 1–3 in each furrow, 2–9 on commissure. Seed face plane or slightly concave. Carpophore 2-cleft to base.
About 12 species: E Asia, C Europe, North America; three species (one endemic) in China.
(Authors: Pan Zehui (潘泽惠); Mark F. Watson)