Figure 3 from: Pereira AJ, Francisco A, Porto M (2016) Flora-On: Occurrence data of the vascular flora of mainland Portugal. PhytoKeys 69: 105-119. https://doi.org/10.3897/phytokeys.69.9432

Figure 3 - Tree map of the Flora-On dataset based on a two-level taxonomic classification. Families are delineated with thick lines and genera with thin lines. The size of the rectangles is proportional to the number of records held. The plot was built with the R package 'treemap' (Tennekes 2016).