Description from Flora of China
Herbs, perennial, all parts glabrous. Taproot thick, long-conic, branched. Stem stout, usually solitary, unbranched, hollow, ribbed, purplish, base densely clothed with fibrous remnant sheaths. Leaves mostly basal, petiolate, sheath broad and clasping at base, base often below ground level; blade (2–)3–4-ternate-pinnate, very finely divided, rather small; ultimate segments narrow. Umbels compound, mainly one large terminal and a few smaller lateral umbels; bracts absent; rays many, subequal, thick, congested; bracteoles many, 2–3-pinnate or entire, margin scarious; umbellules many-flowered, congested. Calyx teeth small, ovate to ovate-triangular. Petals ovate or obovate, yellowish or white, sometimes flushed purple, midvein darker, base clawed, apex inflexed. Stylopodium low-conic, dark purple; styles long, reflexed. Fruit ellipsoid, slightly laterally compressed; ribs 5, dorsal ribs filiform; lateral ribs very narrowly winged; vittae large, 2–3 in each furrow, 2 on commissure. Seed face concave. Carpophore very slender, 2-parted to base.
(Authors: Pan Zehui (潘泽惠); Mark F. Watson)