24. Zizia. Ribs filiform; stylopodium none. Flowers yellow.
25. Carum. Ribs filiform or inconspicuous; stylopodium short-conical. Leaf-segments filiform. Roots tuberous.
26. Cicuta. Ribs flattish, corky, the lateral largest. Marsh perennials, with serrate leaflets, the veins often running to the notches.
27. Ægopodium. Ribs filiform; oil-tubes none; stylopodium conical. Leaves biternate.
[=][=][=][=] Leaves finely dissected; oil-tubes solitary. Very slender annuals.
28. Leptocaulis. Fruit bristly or tuberculate, with rather prominent equal ribs.
29. Discopleura. Dorsal ribs filiform, the lateral very thick and corky.
[++][++] Seed-face concave; fruit ovate, glabrous, with depressed stylopodium, and no oil-tubes.
30. Conium. An introduced biennial, with spotted stems, and large decompound leaves.
[++][++][++] Seed-face concave. Fruit linear-oblong, with conical stylopodium.