| 1 | Upper part of pedicels pilose |
| 1' | Upper part of pedicels glabrous except for glandular hairs |
| 2 | Disc as high as broad or broader than high (flat). Philippines, New Guinea, Solomons |
| 2' | Disc higher than broad. Nicobar Islands, Sumatra |
| 3 | Ovary (sub)glabrous (to pilose); if pilose then disc usually with slits. Petals 0.5-2.2 mm high, crests often present as ribs or as flat scales. New Guinea, Solomons. |
| 3' | Ovary pilose; disc without slits. Petals 0.4-1 mm high, crests absent. Philippines |
| 4 | Disc as high as broad, without slits. Crests usually present on petal scales as ribs or as flat appendages. Ovary (sub)glabrous. N coast of New Guinea: E Geelvink Bay to Madang Province |
| 4' | Disc flat to as high as broad, usually with slits. Crests usually absent, at most present as ribs. Ovary subglabrous to pilose. New Guinea: Peninsula to S coast to Vogelkop |
| 5 | Stamens 8, some flowers of a cymule, especially the first flowering male ones, with 9 or more. Solomons and New Guinea (absent in Morobe Prov.) |
| 5' | Stamens 8. New Guinea: Morobe Province |
| 6 | Inflorescences up to 17 cm long, axillary to pseudoterminal. Each inflorescence with at least a few big bracts 1-3.3 mm long. Solomons and N New Guinea: Jayapura to Morobe Province to Bougainville |
| 6' | Inflorescences up to 8.5 cm long, usually ramiflorous on thin twigs to axillary to pseudoterminal. Inflorescences with only small bracts 0.7-1.3 mm long. New Guinea: Peninsula to S coast to Vogelkop |
