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Molecular phylogenetic tree based on common plastid genes. The phylogenetic tree was constructed with 77 shared genes present in 20 species using the maximum likelihood method implemented in Phylosuite. Costus pulverulentus, Costus viridis and Canna, were used as outgroups. Tribes to which each species belongs were shown to the right side of the tree. Bootstrap values were calculated with 1000 replicates
