A taxonomic revision of the genus Dolianthus (Rubiaceae)

A taxonomic revision of Dolianthus C.H. Wright (Rubiaceae-Psychotrieae) is presented, including a key to species, full descriptions, distribution maps , and a list of specimens examined. Eleven species are transferred from Ama racarpus to Dolianthus, resulting in ten new combinations. Two species are described as new to science: D. kairoi and D. ovatifolius. In total, thirte en species are included in Dolianthus. Dolianthus is endemic to the highlan ds (montane to subalpine and alpine zones) of Papua New Guinea.