| 1 | Leaves unifoliolate or seemingly simple |
| 1' | Leaves l-3(-6)-jugate |
| 2 | Leaves 4-6-jugate |
| 2' | Leaves 1-3-jugate |
| 3 | Leaflets extremely unequal, the lower pair elliptic or ovate, very small, 0.5-1.6 cm long, acute at the apex, the upper pair lanceolate, 7.5-16 cm long, acuminate at the apex. Rachis of inflorescence absent. Stamens 12, all fertile |
| 3' | Leaflets not as above, ovate-oblong to oblong, 1.8-2 cm long, very deeply emarginate at the apex. Rachis of inflorescence 2.5-4.5 mm. Stamens 10, one sterile |
| 4 | Inflorescences 4 or 5, borne on hard knots on the trunk. Leaves 1-jugate. Fruits fleshy, 2.7-3 by 1.8-2 by 1 cm, rugose. Known only in cultivation |
| 4' | Inflorescences usually solitary, axillary |
| 5 | Petiole 2 mm. Leaflets small, (1.8 — )3.5-4.5 by (0.7-)l. 1-1.4 cm; apex acuminate, emarginate and mucronate at the tip |
| 5' | Petiole usually more than 4 mm, up to 15 mm. Leaflets usually much larger. |
| 6 | Leaflets obtuse or rounded at the apex |
| 6' | Leaflets acuminate at the apex |
| 7 | Leaves 2-jugate, petiole 6-15 mm. Leaflet pairs of unequal size, the upper one 11-20 by 4-8 cm, the lower one 4-8.5 by 1.8-5 cm.. 5. |
| 7' | Leaves 1- or 2-jugate, petiole 2-4 mm. Leaflets about the same size |
| 8 | Rachis of inflorescence 3-4 mm. Bracts minute, c. 1 mm long. Petals small, 2 mm long. Anthers more or less apiculate. Fruits deeply rugose |
| 8' | Rachis of inflorescence 5-6 mm. Bracts larger, c. 3 mm long. Petals 4.5 mm long. Anthers not apiculate. Fruits unknown |
| 9 | Rachis of inflorescence or infructescence very short, less than 4 mm long.. |
| 9' | Rachis of inflorescence or infructescence longer, 10-45 mm long |
| 10 | Leaflets 14-25 by 4.7 cm, tip of acumen pointed, not emarginate |
| 10' | Leaflets smaller, 4-7 by 1-3 cm, tip of acumen emarginate |
| 11 | Fruits deeply rugose. Rachis of inflorescence 13-25 mm; pedicels 7-15 mm.. |
| 11' | Fruits smooth or rough, not rugose |
| 12 | Fruits asymmetrical, convex on outer side, straight on inner side, rough. Rachis of infructescence 4.5 cm long |
| 12' | Fruits ± symmetrical, smooth. Rachis of inflorescence 0.5-3 cm long |
| 13 | Pedicels of flowers 18-26 mm. Petals 7 mm long |
| 13' | Pedicels of flowers 4-8 mm. Petals smaller, 2-4 mm long |
