31. Chærophyllum. Fruit glabrous, with small mostly solitary oil-tubes.
32. Osmorrhiza. Fruit bristly, with oil-tubes obsolete.
[+][+][+] Carpels (as well as fruit) strongly flattened laterally.
[++] Seed lunate, deeply sulcate on the face; umbels compound, leafy-bracted.
33. Erigenia. Fruit nearly orbicular, with numerous oil-tubes. Low, nearly acaulescent from a deep-seated tuber. Leaves ternately decompound.
[++][++] Seed straight, not sulcate; umbels simple.
34. Hydrocotyle. Fruit more or less orbicular, with no oil-tubes. Low perennials, in or near water, with creeping stems, and peltate or reniform leaves.
[*][*][*][*] Fruit obovoid or globose, densely prickly or scaly.
35. Eryngium. Flowers sessile in dense bracteate heads, white or blue. Leaves mostly rigid and more or less spinose.
36. Sanicula. Flowers in irregularly compound few-rayed umbels, yellow. Leaves palmate.