Evolution of inner tepal and stamen symmetry in Commelinaceae. Maximum likelihood (ML) trn L phylogeny reconstruction with support values for 500 ML bootstrap replicates based on Burns et al. (2011), using Philydraceae species as outgroups . Focal taxa are in bold. Inner tepal and stamen morphology is depicted for each species as bilaterally symmetrical (gray) or radially symmetrical (black). The ancestral state of Commelinaceae inner tepal and stamen symmetry is reconstructed as radial and bilateral, respectively. A shift to radial stamen symmetry is inferred at the base of Tradescantia, whereas a late-developmental shift to weak bilateral symmetry is inferred for C. dianthifolia and C. virginica.