Herbs perennial, glabrous. Taproots stout, branched near stem into a cluster of several long, woody, carrot-like roots with prominent annular scars when old. Stem fistulose, erect, branched above, base clothed in purplish-brown remnant sheaths. Basal leaves petiolate, 4-pinnatisect; petiole narrowly sheathing at base; ultimate segments linear or linear-elliptic. Umbels loose, compound; peduncles terminal and lateral, stout, branching, mostly longer than leaves; bracts and bracteoles absent (bracts occasionally present, few); rays few to numerous. Calyx teeth minute, triangular. Petals yellow or greenish-yellow, irregular square, obovate suborbicular, median line dark, apex narrowly inflexed. Stylopodium broadly low-conic, disk crenulate; styles short, reflexed. Fruit ovoid or ellipsoid, slightly laterally compressed; mericarps subpentagonal in cross section; ribs 5, filiform, prominent, acute-ridged, almost narrowly winged; vittae 1 in each furrow, 2 on commissure. Seed face deeply sulcate or concave. Carpophore 2-cleft to base.
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