| 1 | At least young parts with red glands. Lower side of leaflets sericeous. Pistillode, ovary and fruits 2-celled; stigma with 2 lines |
| 1' | Red glands absent. Lower side of leaflets glabrous to puberulous, if appressed hairy then not sericeous. Pistillode, ovary and fruits 3-celled; stigma with 3 lines. |
| 2 | Axial parts villose to tomentose. Petals glabrous outside, with 1 scale. Stamens exserted. New Guinea |
| 2' | Axial parts strigose. Petals hairy outside, with 2 scales. Stamens not exserted. Celebes |
| 3 | Leaflets usually with small, pocket-like domatia. Petalar scales crested. Fruits ellipsoid, lenticular or obcordate, 4-8 by 4-6 cm, stipe c. 10 mm long. Seeds 3.5-4 by 2-3 cm, with a sarcotesta |
| 3' | Leaflets without domatia. Petalar scales not crested. Fruits transversely ellipsoid to obreniform, 2 by 3 cm, stipe 1 mm long. Seeds 1 by 0.5 cm, with an arillode |
| 4 | Stamens (or staminodes) 8 |
| 4' | Stamens (or staminodes) 10-14 |
| 5 | Leaflets entire, rarely obscurely crenate |
| 5' | Leaflets dentate to serrate, rarely crenate or entire, but never all leaflets entire |
| 6 | Axial parts strigose. Flowering twigs 1-5 mm in diam. Leaves (l-)2-6(-7)-jugate |
| 6' | Axial parts villose to tomentose. Flowering twigs 10-15 mm in diam. Leaves 6-11-jugate |
| 7 | Leaflets (narrowly) obovate or rarely elliptic, apex obtuse to rounded, often retuse, rarely shortly and broadly acuminate. Petals in male flowers elliptic to obovate, sometimes semicircular, 0.5-3.5 by 0.6-3.6 mm |
| 7' | Leaflets ovate, apex acuminate. Petals in male flowers Ungulate, 1.8-2.3 by 0.5-0.7 mm |
| 8 | Upper leaflets 25.5-32.5 by 6-7 mm, apex acuminate, petiolules 2-5 mm long. Anthers glabrous |
| 8' | Upper leaflets c. 21.5 by 7 mm, apex rounded, petiolules 15-17 mm long. Anthers hairy. Testa of seeds hairy at apex |
| 9 | Leaves 6-jugate. Upper leaflets narrowly elliptic, c. 32.5 by 6 mm, petiolules 2-3 mm long. Inflorescences 10.5 cm long. Bracts subelliptic to acicular, 1.9-3 by 0.5-1.2 mm |
| 9' | Leaves c. 10-jugate. Upper leaflets ovate, c. 25.5 by 7.3 cm, petiolules 3-5 mm long. Inflorescences 19.5-35 cm long. Bracts narrowly triangular, 0.6-1 by 0.2-0.4 mm |
| 10 | Inflorescences longer than 3 cm, with long or short branches, laxly flowered. Petals shorter than, exceptionally as long as the sepals |
| 10' | Inflorescences up to 3 cm long, without, rarely with short branches, densely flowered. Petals longer than, rarely as long as or shorter than the sepals |
| 11 | Leaves (3-)4-18(-28)-jugate. Leaflets thinly papyraceous to coriaceous |
| 11' | Leaves 2-3-jugate. Leaflets coriaceous |
| 12 | Leaflets usually dentate in upper part, rarely entire. Endocarp villose |
| 12' | Leaflets dentate to serrate all around, rarely crenate or entire. Endocarp thinly to densely appressed hairy to more or less villose |
