| 1 | Ovary glabrous or only with a few hairs. Sepals and petals always glabrous. |
| 1' | Ovary entirely, rarely partly, but always densely pubescent. Sepals and petals glabrous or pubescent. |
| 2 | Leaves 3-5-jugate; leaflets dentate (sometimes only a few teeth), with domatia in the axils of the nerves beneath which are sometimes obscured by very dense tomentum of the leaf-blade |
| 2' | Leaves (3-)4-6(-7)-jugate; leaflets dentate or not, without domatia, never with very dense tomentum. |
| 3 | Leaflets entire, index (1-)1.5-3, mostly rounded or obtuse to truncate or emarginate at the base. Medium-sized to large trees |
| 3' | Leaflets dentate (sometimes very sparsely), index (1—)1.5—4(—5), acute or rounded, obtuse, truncate or emarginate at the base. Small to medium-sized trees, rarely shrubs. |
| 4 | Leaflets moderately to rather densely villous-pubescent (often more or less glabrescent when older), mostly (especially lower ones) rounded to truncate at the base, index 1.5—3(—4). Endocarps 6-7 mm diam., without ventral processus. Above c. 1800 m alt. |
| 4' | Leaflets sparsely to densely short-pubescent, rarely subglabrous, mostly with acute base, index 1.5-4(-5). Endocarps 5-7.5 mm diam., mostly with a small but distinct ventral processus. Below c. 1000 m altitude. |
| 5 | Leaves (3-)4-6(-7)-jugate; leaflets acute at the base |
| 5' | Leaves 3-5(-6)-jugate; lateral leaflets rounded to truncate at the base |
| 6 | Sepals and usually also outer petals moderately to densely pubescent on the outside. Leaflets entire, index (l-)1.5-3 |
| 6' | Sepals and petals glabrous or rarely a few hairs on the outer sepals only. Leaflets entire or dentate, index (l-)1.5-4(-5). |
| 7 | Endocarps 4.5-9(-10) mm diam., usually with more or less sunken ventral pore. Inner petals with fimbriate or ciliolate, rarely glabrous lobes. Leaflets never with domatia |
| 7' | Endocarps (2.5-)3-4.5 mm diam., not with sunken ventral pore. Inner petals with usually glabrous, sometimes at the tips ciliolate or frayed lobes. Leaflets with or without domatia |
