The genus Exochaenium (22 species) is endemic to sub-Saharan Africa, with species occurring in most tropical and sub-tropical regions of the continent, particularly on the Katanga plateau (Angola, Democratic Republic of Congo and Zambia), with many extending to the Sudano-Zambesian and Guineo-Congolian regions. The genus is monophyletic and is used to study the variation and evolution of herkogamy.
Species
Exochaenium alatum (Paiva and Nogueira) Kissling
Exochaenium baumianum (Gilg) Schinz
Exochaenium caudatum (Paiva and Nogueira) Kissling
Exochaenium clavatum (Paiva and Nogueira) Kissling
Exochaenium debile Welw. Exochaenium dimidiatum (Sileshi) Kissling Exochaenium exiguum A.W.Hill Exochaenium fernandesianum (Paiva and Nogueira) Kissling Exochaenium gracile (Welw.) Schinz Exochaenium grande (E.Mey.) Griseb. Exochaenium hockii (De Wild.) Kissling Exochaenium lineariforme (Sileshi) Kissling Exochaenium macropterum (Sileshi) Kissling Exochaenium oliganthum (Gilg) Kissling Exochaenium perparvum (Sileshi) Kissling Exochaenium platypterum (Baker) Schinz Exochaenium primulaeflorum Welw. Exochaenium pumilum (Baker) Hill Exochaenium pygmaeum Milne-Redhead Exochaenium rotundifolium (Peter) Kissling Exochaenium teucszii (Schinz) Schinz Exochaenium wildemanianum (Boutique) Kissling