KEY TO THE SPECIES

1Ovary (and capsule) 2-celled with ovules cq. seeds on the septs. Dioecious tree: flowers by reduction unisexual, rarely bisexual. Leaves papyraceous. Sect. Crypteronia
1'Ovary (and capsule) 3- or 4-celled with ovules (seeds) inserted basally. Flowers bisexual. Leaves usually coriaceous. Sect. Basispermia.
2Inflorescences terminal at main or side twigs, 10-25(-40) cm. Ovary (capsule) 3-locular Sepals usually with longitudinal crest at the inside
2'Inflorescences axillary below the leaves on older nodes, or ramiflorous, 15-90 cm. Ovary (capsule) 3- or 4-celled. Sepals with or without longitudinal crest at the inside.
3Inflorescences below the leaves on older nodes, 15-50 cm, only with primary, very rarely with a few econdary side-axes near the base. Ovary (capsule) 3-celled. Sepals without crest.
3'Inflorescences ramiflorous, 45-90 cm, with primary, secondary and tertiary side-axes. Ovary (capsule) 4-celled. Sepals with a longitudinal crest at the inside