Belgian Journal of Botany vol:136 issue:1 pages:73-90
Revision of Pauridiantha paucinervis and its closest relatives (Rubiaceae, Pauridiantheae). - The problematic delimitation of the tropical African Pauridiantha paucinervis is discussed in detail. In order to unravel the identity of the species, a complex of closely related species and subspecies has been revised with special attention to otherwise often overlooked characters such as calyx and seed morphology, seed anatomy, and types of domatia. It is demonstrated that Pauridiantha bequaertii, P. dewevrei and P. pyramidata, all three often confused with P. paucinervis, are well delimited, and hence deserve the specific rank. On the contrary, Pauridiantha claessensii, P. butaguensis, P. holstii and P. lyallii are reduced to the synonymy of P. paucinervis and it is shown that it is inappropriate to treat them as subspecies as proposed in the literature. A key to the species discussed, as well as detailed distribution maps are provided.