| 1 | Leaf nervation truly dryobalanoid. Spp. 1-26. |
| 1' | Not so. |
| 2 | Ovary and stylopodium not constricted between. |
| 2' | Ovary and stylopodium hour-glass-shaped, distinctly constricted. Spp. 71-84 |
| 3 | Flowers remote on raceme; bracts subpersistent. Spp. 27-39 |
| 3' | Flowers dense on raceme; bracts fugaceous. Spp. 40-70 |
