| 1 | Petals more than 5 mm long |
| 1' | Petals less than 5 mm long |
| 2 | Leaf blade (narrowly) triangular, at base broadest and truncate |
| 2' | Leaf blade narrowly elliptic, at base narrowed. — New Guinea |
| 3 | Male flowers 2-4 on each node (female flowers not seen). Receptacle-tube 3.5 mm long. — Philippines |
| 3' | Male flowers single (beside 1 female flower) on each node. Receptacle-tube c. 1.5 mm long. — New Guinea |
| 4 | Leaf blade (3-)5-lobed, lobes to (1/5-)halfway deep or more |
| 4' | Leaf blade lobed less than halfway deep or leaves hastate or unlobed |
| 5 | Fruit ellipsoid, 1(-1.5) cm long. — Philippines |
| 5' | Fruit globose, 0.5(-1) cm diameter. — New Guinea |
| 6 | Fruit fusiform, long-tapering at base and apex |
| 6' | Fruit globose, ellipsoid or short-cylindrical, at base short-cuneate or more or less rounded |
| 7 | Fruit 5-6 cm long. — Papua New Guinea |
| 7' | Fruit 2.5-4.5 cm long. — Java, Lesser Sunda Islands |
| 8 | Fruit whitish. Seeds 5.5-7 mm long. — Submontane; South Sumatra, Java |
| 8' | Fruit whitish or green. Seeds 2-5 mm long. — Lowlands |
| 9 | Leaf blade narrow, long-triangular, mostly conspicuously long-bristly hairy on the veins beneath, hairs 0.5-1.5 mm long. Ovary sparsely hairy. — Philippines |
| 9' | Leaf blade broader, less conspicuously hairy on veins beneath, hairs 1 mm long or less |
| 10 | Fruit 2-4 cm long, often irregularly speckled or blotched. — East Java, Lesser Sunda Islands, Philippines |
| 10' | Fruit 1-2 cm long, not speckled |
| 11 | Fruit ellipsoid, 1.5-2 cm long, green. Dry exocarp opaque, seeds not shining through. — Moluccas(?), Papua |
| 11' | Fruit globose or short-ellipsoid, 1-1.5 cm long, whitish. Dry exocarp filmy, transparent, when dry seeds mostly shining through. — Widespread |
