 "Memecylon" species discovery in Madagascar increased, and comprehensive taxonomic revisions brought the total number up to 138 species, making "Memecylon" one of the most species-rich groups in the woody flora of Madagascar.In addition to this high species richness, a high degree of endemism of "Memecylon" indicated the importance of considering ecogeographic factors when making species identifications in this group.Therefore, in the latest molecular phylogeny, a combined study of ecogeographic factors has been taken into account.