| 1 | Leaves (15-)20-40(-50) cm long; lower surface with persistent short dense indumentum. [Inflorescence a (sub)sessile, short brachyblast] |
| 1' | Leaves generally smaller; lower surface glabrous, glabrescent, or with minute sparseindumentum. |
| 2 | Inflorescences (infructescences) with a peduncle. Buds angular in apical part. Fruits glabrescent or with sparse greyish hairs. |
| 2' | Inflorescences sessile or pedunculate. Buds rounded in apical part, not angular (of some species male flowers not known). Fruits with (minute) rusty indumentum |
| 3 | Twigs 1-2 mm diam. |
| 3' | Twigs generally thicker, 1.5-5 mm diam. Inflorescence a (sub)sessile brachyblast, peduncle absent or to 2 mm long only. |
| 4 | Leaves membranous, 9-19 cm long. Inflorescences slenderly pedunculate, sometimes subsessile. Flowers small, conspicuously rough-hairy. Fruits not known. |
| 4' | Leaves coriaceous, (2.5-)4-7.5 cm long. Inflorescences sessile. Flowers not known. Fruits ± ellipsoid, 2-2.5 cm long. — Ultrabasic soils of Central Sulawesi. |
| 5 | Twigs 4-5 mm diam. Leaves coriaceous, lower leaf surface not whitish, not minutely dotted (lens!). [Fruits subglobose, 5 cm diam.; pericarp nearly woody, 10 mm thick.] — Central Sulawesi; soils on conglomeratic and ultrabasic bedrock; 400 m. |
| 5' | Twigs 1.5-5 mm diam. Leaves membranous, lower surface conspicuously pale, minutely dark-dotted (lens!). |
| 6 | Twigs 4-5 mm diam. Female flowers and fruits (sub)sessile. Fruits subglobose, 2-2.5(-3) cm long; pericarp 1-3 mm thick, hairs 0.1-0.2 mm. [Male flowers not known.] — N, C and SW Sulawesi. |
| 6' | Twigs 1.5-4(-5) mm diam. Female flowers and fruits stipitate. Fruits ± ellipsoid, 3-4 cm long; pericarp 3-6(-8) mm thick, hairs 0.1 mm. |
| 7 | Twigs 1.5-3 mm diam. Fruiting pedicel 6-10 mm long, conspicuously pubescent, hairs 1-1.5 mm. [Male flowers not known.] — NE Sulawesi (Minahasa). |
| 7' | Twigs 2-4(-5) mm diam. Fruiting pedicel 3-5(-7) mm long, glabrescent or with hairs to 0.5 mm only. — Sulawesi (except Minahasa); incl. Kjellberg 2990. |
