| 1 | Fruit 4-more-seeded. |
| 2 | Embryo thick, covered by little endosperm. Spp. 72-76 |
| 2' | Embryo flat, covered by copious endosperm. Spp. 69-71 |
| 2'' | Fruit 1- (exceptionally 2-)seeded. |
| 3 | Stamens triadelphous. Embryo flat, covered by copious endosperm. Spp. 64-68 |
| 3' | Stamens monadelphous or free. Embryo thick, without or with little endosperm. |
| 4 | Stigma peltate. Twigs at the nodes with a pair of annular glands. Sp. 63 |
| 4' | Stigma small, slightly bilobed. Nodal glands absent on the twigs. Spp. 1-62 |
