| 1 | Leaves 10-30 cm; nerves in (11—)14—22(—24) pairs. Hairs underneath the leaf blade not curved towards their base. Tepals (12-)c. 15. Sulawesi, Moluccas, New Guinea |
| 1' | Leaves 16-46 cm; nerves (14—)17—18 pairs. Hairs underneath the leaf blade usually (uncinately) curved towards the base. Tepals (10—)12. Sumatra, Borneo |
| 2 | Young twigs and stipules hairy; ovary puberulous |
| 2' | Entire plant glabrous |
