| 1 | Ovary 2-celled. |
| 1' | Ovary 5- or 6-celled |
| 2 | Ovary broadly campanulate, not ribbed; 'epicalyx' below ovary distinct. Leaf margin usually distinctly serrate. Inflorescence branches usually bearing lateral umbellules |
| 2' | Ovary narrowly turbinate, strongly ribbed; 'epicalyx' below the ovary absent. Leaf margin entire or minutely dentate. Inflorescence branches usually without lateral umbellules. |
