Annex supplement

To further investigate the phylogenetic position of <i>A. japonica</i>, complete chloroplast genome sequences of this taxon and 14 other species selected from the Primulaceae and one outgroup were used to construct phylogenetic tree. <i>Camellia granthamiana</i> was selected as the outgroup of the phylogenetic tree. This study also used 85 protein-coding genes to conduct a ML analysis under the GTR + R + I model with 1000 bootstrap replicates. The phylogenetic tree showed that <i>A. japonica </i>was clustered with other species in Primulaceae with strong support (Figure 1). The complete plastome sequence of <i>A. japonica</i> will provide a useful resource for the conservation genetics of this species as well as for the phylogenetic studies for Primulaceae.