Résumé
Background and aims - Diospyros (Ebenaceae), a large genus with a mostly tropical distribution, includes 736 species worldwide, 104 of which occur in continental Africa. During recent field work in west-central Gabon, two new species of Diospyros were collected. They are described and illustrated here, and compared with their most similar relatives. Preliminary conservation status assessments are also provided.
Methods - Normal practices of herbarium taxonomy were applied to study all available herbarium material, mainly from BR, BRLU, LBV, MO, P and WAG. The conservation status of both species was evaluated following the IUCN Red List Categories and Criteria.
Key results - Diospyros cleistantha O.Lachenaud & G.E.S chatz occurs in the Atlantic regions of Cameroon, Equatorial Guinea and Gabon; it belongs to D. sect. Calvitiella and closely resembles D. zenkeri and D. iturensis. Diospyros subargentea O.Lachenaud, Dauby & G.E.Schatz is endemic to west-central Gabon; it belongs to D. sect. Noltia and most closely resembles D. soyauxii. The conservation status of the two species is assessed as Endangered and Vulnerable, respectively.