| 1 | Axial parts glabrous or strigose |
| 1' | Axial parts densely tomentose |
| 2 | Apex of leaflets acute or acuminate |
| 2' | Apex of leaflets obtuse to rounded, rarely retuse |
| 3 | Fruits triquetrous in cross section, distinctly keeled, 20-35 by 20-25 mm, wall 3.7-5.5 mm thick |
| 3' | Fruits deltoid in cross section, not keeled, 10-13 by 10 mm, wall 1.4-2.1 mm thick |
| 4 | Fruits 20-35 by 20-30 mm, wall 2.5-6.5 mm thick |
| 4' | Fruits 13-20(-25) by 11-20 mm, wall 1.3-2(-3.4) mm thick |
| 5 | Lower surface of leaflets (thinly) pilose. Anthers glabrous. Fruits obovoid to globular, wall 4-6.5 mm thick, outside glabrous to velutinous |
| 5' | Lower surface of leaflets glabrous. Anthers hairy. Fruits ellipsoid, wall 2.5-2.9 mm thick, outside glabrous |
| 6 | Leaflets with 8-20 nerves per side, upper and lower surface glabrous to pilose; petiolule 2-10 mm long. Outside of fruits glabrous to thinly appressed-hairy. |
| 6' | Leaflets with 9 or 10 nerves per side, upper surface thinly, lower surface densely pilose; petiolule 1 or 2 mm long. Outside of fruits appressed-hairy |
| 7 | Anthers 1.1-1.4 mm long. Fruits 13-15 by 12-14 mm, wall 1.3-1.9 mm thick, outside glabrous to thinly appressed-hairy. Seeds 5-8 by 3-4 mm |
| 7' | Anthers 0.4-0.6 mm long. Fruits 13-25 by 11-20 mm, wall 1.4-3.4 mm thick, outside glabrous. Seeds 7-15 by 4-7 mm |
