Herbs perennial, plant withered in every summer, sprouting again in autumn. Taproot long-cylindric, deep-rooted with a slender and elongated stem to soil surface. Arial stem terete, erect, base purplish, distally glaucous, branched above. Basal leaves numerous, 2–3-ternate-pinnate. Umbels loosely compound; inflorescence branches many-branched and spreading; bracts and bracteoles usually absent, rarely with 1–3 linear, membranous and deciduous bracts or bracteoles. Calyx teeth conspicuous, narrowly triangular. Petals white or purplish, midvein conspicuous. Stylopodium conic; styles much longer than stylopodium, often reflexed. Fruit ellipsoid, dorsally compressed; dorsal ribs filiform, prominent, lateral ribs narrowly winged, wings thickened; vittae 2–3 in each furrow, 4–6 on commissure. Seed face plane.
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