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This study comprises a taxonomic revision and phylogenetic and biogeographic analyses of the genera Baccaurea, Distichirhops, and Nothobaccaurea (Euphorbiaceae). Baccaurea was chosen as a model genus for study in the framework of the research program 'Pathways from Asia to new Guinea' of the Dutch Science Foundation because of interesting problems in the areas of phylogeny (Chapter 1), biogeography (Chapter 2), and species delimitation (Chapter 3). Moreover, Baccaurea species are also of economic and ecological importance. During the study of Baccaurea it became obvious that two species from Pacific islands, formerly recognised as Baccaurea species, constitute in fact a new genus: Nothobaccaurea. Furthermore, it became obvious that three unidentified species do not belong to any known genus; they are placed in an also newly described genus, called Distichirhops.
