Fig. 1

A Chloroplast genome schematic map of Salvia in this study. The centre of the figure provides length range of the cp genomes. In the first inner circle, the proportion of the shaded parts represents the GC content of each part. The gene names are labelled on the outermost layer. The transcription directions for the inner and outer genes are listed clockwise and anticlockwise, respectively. B Phylogenetic relationships of 14 Salvia species inferred from MP and ML methods by using complete cp genomes. Numbers above clades are support values with MP bootstrap values on the left and ML bootstrap values on the right. Rose red squares and green diamonds represent S. miltiorrhiza and its substitutes as well as other non-substitute species of Salvia, respectively