| 1 | Leaves simple or pinnate; when pinnate rachis terminating in 3 leaflets (anomalously 2 or 1). Sepals mostly 5. Outer petals narrowly imbricate, subrotund to broad-elliptic, all regularly shaped. Vascular bundle connecting pedicel and seed situated in a long or short marginal canal inside the endocarp. About 12 species in SE. Asia. Spp. 1-7 |
| 1' | Leaves pinnate, petiolule of terminal leaflet articulate with the rachis. Sepals mostly 4. Outer petals widely imbricate, the largest one widely reniform, much wider than long, the smaller ones of irregular shape ± not wider than long. Vascular bundle connecting pedicel and seed situated outside the endocarp, either running in a groove at the ventral side or freely in the pulpy mesocarp |
| 2 | Leaves simple or pinnate. Ovary glabrous or pubescent. Endocarp wall relatively thin, not drawn out around the ventral perforation; endocarp mostly (sub)globose, sometimes semiglobose, or ellipsoid to obovoid. About 12 spp. in SE. Asia. Spp. 1-7 |
| 2' | Leaves simple. Ovary always glabrous. Endocarp wall relatively thick, more or less drawn out around the ventral perforation which often gives the mostly (sub)globose endocarp a somewhat pyriform shape. About 10 species in Central and tropical South America |
| 3 | Leaves simple. Spp. 1 & 2 |
| 3' | Leaves pinnate. Spp. 3-7 |
| 4 | Deciduous shrubs or small trees. Nerves all or almost all straight or almost straight. Continental Asia |
| 4' | Evergreen shrubs or trees. Nerves all or almost all distinctly ascending. Spp. 1 & 2 |
| 5 | Deciduous trees. Vascular bundle connecting pedicel and seed running in a ventral groove of the endocarp wall. Two species. SE. Asia and S. Mexico |
| 5' | Evergreen trees. Vascular bundle connecting pedicel and seed running freely in the mesocarp. One species. Malay Peninsula, N. Borneo. Sp. 8 |
