Fig. 1

Geographical distribution and bioregion analysis of the species of the P. integrifolia complex. a Taxon distribution based on field collection and data available at SpeciesLink (http://www.splink.org.br) and the Global Biodiversity Information Facility (GBIF; http://www.gbif.org). Bioregions delimited according to Infomap Bioregions [79] are shown in transparent boxes (blue: bioregion 1; pink: bioregion 2; grey: bioregion 3. b Phylogenetic tree of Petunia species based on sequences from Segatto et al. (2016) with ancestral ranges reconstructed under Fitch’s method of Maximum Parsimony. Pie charts depict the most parsimonious ancestral range at selected nodes, and colours are according to the map bioregions (Fig. 2a). Country boundaries obtained from http://www.diva-gis.org