| 1 | Nerves 2.5-8 mm apart, ending free. Sepals usually 4. Stamens 5-9 |
| 1' | Nerves 5-12.5 mm apart, distinctly looped and joined towards the margin. Sepals usually 5. Stamens 12-15 |
| 2 | Flowers bisexual. Scar of sepals under the fruit strongly lobed. Fruits nearly always 2-locular, straw-coloured or brownish. Coastal |
| 2' | Flowers unisexual, dioecious. Scar of sepals under the fruit usually annular, sometimes slightly lobed. Fruits often partly 3-locular, tinged reddish when ripe. Inland |
