Although the DR Congo houses less than 10% of the species diversity of the genus Coffea, its forests are the habitat of an important stock of genetic diversity for coffee breeding. It is the home land of important genetic diversity of Coffea canephora and Coffea eugenioides, the two parent species of Coffea arabica, and three of their close relatives: Coffea brevipes, C. congensis and C. kivuensis.
In total, 8 Coffea species sensu strictu occur in the DRC (C. liberica s.l., C. kivuensis, C. eugenioides, C. brevipes, Coffea aff. mayumbensis, C. dactylifera, C. canephora, C. congensis) and 4 Psilanthus species (C. mannii, C. sapinii, C. lebruniana, C. sp. nov.), 5 of these species are endemic in the DRC.