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Lepidagathis  Wild., a pantropical genus belonging to the tribe Barlerieae, contains ∼147 species. Considerable morphological work has been done on  Lepidagathis , but some taxonomical doubts and contrasting interpretations still persist. Molecular analysis is the best tool to resolve the taxonomic doubts, but few nucleotide sequence data are available to date on  Lepidagathis . Recently, some phylogenetic and morphological studies have proposed the inclusion of  Teliostachya  and  Lophostachys  in  Lepidagathis . This work constitutes the first phylogenetic analysis of some  Lepidagathis  species based on chloroplast and nuclear regions. Both Bayesian and Maximum Likelihood phylogenetic analyses divide studied  Lepidagathis  species into two main clades, i.e. Clade A and B and place the Indian endemic  Lepidagathis  in Clade A with strong support. Phylogeny based on combined data resolve  Lepidagathis ,  Barleria , and  Crabbea  lineages with stronger support than nrITS and cpDNA phylogenies. This phylogenetic study supports previous systematic revisions about the inclusion of  Lophostachys  and  Acanthura  species in  Lepidagathis  as well as the inclusion of  Golaea  and  Acanthostelma  into  Crabbea  species. In conclusion, this study constitutes a baseline molecular phylogeny for  Lepidagathis  and, in particular, contributes to the knowledge of the genetic diversity of Indian representatives of the genus.

Molecular phylogeny and genetic diversity of some Lepidagathis species (Acanthaceae) based on nuclear and chloroplast regions