Phylogeny and biogeography of Myrcia sect. Aguava (Myrtaceae, Myrteae) based on phylogenomic and Sanger data provide evidence for a Cerrado origin and geographically structured clades

•Our results highlight the importance of the number of locules in Myrcia classification.•The widespread and taxonomically complex Myrcia guianensis is non-monophyletic.•Myrcia sect. Aguava appears to have originated in the Cerrado.•Transitions from Cerrado to humid forests occurred in the evolution of M. sect. Aguava.•Combination of NGS and Sanger data is possible and generates robust phylogenetic trees.