griffithiana, as well as the widespread distribution of its most common chloroplast haplotype from peninsular Malaysia up to Indochina, indicates a recent expansion in this area. In contrast, the weak genetic differentiation within M. The pronounced genetic structure indicates a comparatively long diversification for this species. motleyana was partly reflected by similar patterns of genetic variation. The high intraspecific morphological variation of the Bornean endemic M. We found no indication for introgression or hybridization events. griffithiana, highlighting problems of defining species boundaries. Genetic differentiation was stronger each within M. motleyana, but gave ambiguous results for M.

Nuclear microsatellite data supported the taxonomic distinctness of M. Chloroplast DNA haplotypes proved to be species-specific and showed a strong phylogeographic pattern. motleyana) with the aim of resolving their controversial taxonomy and historical biogeography. In the present study, we analyzed the genetic structure of three closely related species of this section (M. Phylogenetic studies suggested a recent radiation of section Pachystemon which comprises the majority of obligate myrmecophytes within Macaranga.

Species of the pioneer tree genus Macaranga, which is also known for its association with ants, are often abundant in disturbed areas. Members of the Euphorbiaceae are ecologically important elements of Southeast Asian forests.

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