Description from Flora of China
Herbs, perennial, white-pubescent throughout. Stem strongly shortened, branched. Leaves long-petiolate, sheathing at base; blade 1–2-ternate. Umbels compound, terminal and lateral, crowded; bracts absent; rays unequal; bracteoles several, lanceolate; umbellules subcapitate; pedicels inconspicuous. Calyx teeth minute, ovate-lanceolate. Petals white or purple-red, obovate-lanceolate, hairy abaxially, apex incurved. Stylopodium short-conic. Fruit obovoid to subglobose, slightly flattened dorsally, densely hirsute and velutinous; ribs all corky-winged, equal or lateral ribs slightly broader than the dorsal; vittae 1–3 in each furrow, 2–6 on commissure. Seed face subplane. Carpophore 2-cleft.
Two species: E Asia, North America; one species in China.
(Authors: Pan Zehui (潘泽惠); Mark F. Watson)