| 1 | Ovary 3-locular |
| 1' | Ovary 2-locular |
| 2 | Petiole of leaves present. Flowering twigs less than 13 mm thick. Leaflets papery to coriaceous |
| 2' | Petiole of leaves absent. Flowering twigs 10-15 mm thick. Leaflets ± coriaceous |
| 3 | Specimen flowering |
| 3' | Specimen fruiting |
| 4 | Petal scales absent |
| 4' | Petal scales folded margins of petal |
| 5 | Flowers 4-5 mm diam. Petals pilose on both sides towards the base; margins glabrous or pilose. Lateral nerves of leaflets 0.5-1.8 cm apart. Petiole 1.3-6 cm long |
| 5' | Flowers 6-8 mm diam. Petals outside pilose, inside glabrous or very laxly hairy; margins pilose. Lateral nerves of leaflets 0.5-3 cm apart. Petiole 2-17 cm long |
| 6 | Inflorescences paniculate. Leaflets opposite to alternate, margin (slightly) recurved. Petiolule a pulvinus only, rarely up to 4 mm long. Margin of petals pilose |
| 6' | Inflorescences thyrsoid, branching only at the base, giving the impression of a tuft of inflorescences. Leaflets opposite, sometimes subopposite, margin flattened to 'lightly recurved. Petiolule 5-10 mm long. Margins of petals glabrous |
| 7 | Leaflets ovate to elliptic, pergamentaceous to coriaceous, apex usually acuminate, sometimes obtuse, acute or cuspidate. Petiolule 7-22 mm long, if shorter, then always inflorescences ramiflorous |
| 7' | Leaflets obovate to elliptic, coriaceous, apex obtuse to distinctly acuminate, then always abruptly narrowing. Petiolule a pulvinus only or up to 10 mm long |
| 8 | Leaflets ovate, index 3.2-4.5. Petals pilose outside, glabrous inside |
| 8' | Leaflets elliptic, index 2.1-2.8. Petals pilose on both sides. |
| 9 | Fruit sutures glabrous |
| 9' | Fruit sutures densely setose |
| 10 | Stipe of fruit less than 3 mm long |
| 10' | Stipe of fruit longer than 3 mm |
| 11 | Stipe of fruit present. Apex of leaflets acute to caudate; midrib prominent above |
| 11' | Stipe of fruit absent. Apex of leaflets obtuse with a slightly emarginate tip; midrib flattened to slightly sunken above |
| 12 | Petiolule usually a pulvinus only, up to 13 mm long. Apex of leaflets acute to cuspidate |
| 12' | Petiolule 9-18 mm long. Apex of leaflets caudate |
| 13 | Fruit reniform to depressed globose, 1.7-2.5 by 2-2.5 cm. Arillode present. Pulvinus of leaflets 1-2 mm long |
| 13' | Fruit obcordate, 1.2-1.5 by 1.2-1.7 cm. Sarcotesta present. Pulvinus of leaflets 5-13 mm long |
| 14 | Leaflets ovate to elliptic, pergamentaceous to coriaceous, apex usually acuminate, sometimes obtuse, acute or cuspidate. Petiolule 7-22 mm long, if shorter, then always inflorescences ramiflorous |
| 14' | Leaflets obovate to elliptic, coriaceous, apex obtuse to acuminate. Petiolule usually a pulvinus only, up to 10 mm long |
