Complete chloroplast genome structural and phylogenetic analysis of <i>Physostegia virginiana</i> (L.) Benth. 1930 (Lamiaceae)

<i>Physostegia virginiana</i> (L.) Benth. (1930) is an ornamental plant with great potential for landscaping application and cut-flower using in China. To explore its phylogenetic position and analyze the characteristics of its chloroplast (cp) genome, this study sequenced the whole cp genome of <i>P. virginiana</i>. The results revealed that the total length of the cp genome was 152,880 bp, and the lengths of the large single-copy region (LSC) and small single-copy region (SSC) were 84,428 and 17,396 bp, respectively. The lengths of the inverted repeat regions (IRa and IRb) were both 25,528 bp. The cp genome of <i>P. virginiana</i> contains 131 coding genes, namely, 86 protein-coding genes, 37 tRNA genes and eight rRNA genes. The total GC content of the cp genome was 38.38%. The phylogenetic results revealed that <i>P. virginiana</i> was closely related to <i>Gomphostemma lucidum</i>. The results of this study provide a molecular basis for the phylogenetic localization of <i>P. virginiana</i> and basic data for its identification and resource development.