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''Calpocalyx'' comprises 11 species and is restricted to the more humid forest types of West and western Central Africa. It is related to ''Xylia'', which differs in its head-like inflorescences. Western Central Africa counts 9 species, West Africa 2. Most of the Central African species have small distribution areas.
=== ''Calpocalyx dinklagei'' ===''[[Calpocalyx dinklagei]]'' Harms occurs from Nigeria to Cabinda (Angola), and is locally common in evergreen forest, especially in Cameroon. Its wood resembles that of ''Calpocalyx heitzii'' and is used for carpentry, but ''Calpocalyx dinklagei'' is usually only a small tree up to 15 m tall with a bole of up to 25 cm in diameter. It differs additionally in its glabrous petioles and wider leaflets. In Cameroon pulverized bark of ''Calpocalyx dinklagei'' is applied to wounds and as an anodyne. === ''Calpocalyx klainei'' ===''Calpocalyx dinklagei'' is sometimes confused with ''[[Calpocalyx klainei]]'' Pierre ex Harms, also a small tree, but the latter occurs mainly in coastal forest in southern Cameroon, Equatorial Guinea and Gabon, and differs in having shortly hairy petioles and longer fruits. Probably ''Calpocalyx klainei'' is also occasionally exploited for its timber. It is rated as vulnerable in the IUCN Red List of threatened species. Several other ''Calpocalyx'' species are undoubtedly also felled occasionally in Cameroon, Equatorial Guinea and Gabon for their timber.
== Anatomy ==
