Our overarching research goals are to reveal patterns of plant diversity at various levels and to understand the ecological, evolutionary, and molecular mechanisms underlying this diversity. To this end, we use a broad conceptual basis and apply methodologies rooted in evolutionary and ecological genomics, phylogenetics, biogeography, cytogenetics, comparative morphology, and the study of plant-animal interactions. Combining these approaches enables us to tackle some of the currently most pressing questions concerning the origin, loss, and maintenance of plant diversity at all relevant spatial, temporal, and taxonomic scales.