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Inferred phylogenetic relationships and approximate divergence times among our focal taxa based on Evans et al. (2015), Session et al. (2016), and Feng et al. (2017). Allotetraploidization (depicted as reticulating lineages) occurred independently in each subgenus; inferred diploid lineages with no known extant diploid descendants are indicated with daggers. Time scale is in millions of years ago; chromosome numbers are shown in parentheses
