Lagerstroemia indica is an important commercial tree known for the ornamental value. In this study, the complete chloroplast genome sequence of Lagerstroemia indica “Pink Velour” (Lagerstroemia “Pink Velour”) was 152,174 bp in length with a GC content of 39.50%. It contained 85 protein coding genes (PCGs), 37 tRNAs, and 8 rRNA genes. 207 simple sequence repeats (SSRs) and 31 codons with relative synonymous codon (RSCU)value > 1 were detected. Phylogenetic analysis divided 10 Lagerstroemia species into evolutionary branches of clade A and clade B. We conducted a comparative analysis of Lagerstroemia “Pink Velours” complete chloroplast genome with the genomes of six closely related Lagerstroemia species from different origins. The structural features of all seven species were similar, except for the deletion of ycf1 nucleobases at the JSA boundary. The large single-copy (LSC) and the small single-copy (SSC) had a higher sequence divergence than the IR region, and 8 genes that were highly divergent (trnK-UUU, petN, psbF, psbJ, ndhE, ndhD, ndhI, ycf1) had been identified and could be used as molecular markers in future studies. High nucleotide diversity was present in genes belonging to the photosynthesis category. Mutation of single nucleic acid was mainly influenced by codon usage. The value percentage of nonsynonymous substitutions (Ka) and synonymous substitutions (Ks) in 6 Lagerstroemia species revealed that more photosynthesis genes have Ka or Ks only in Lagerstroemia fauriei, Lagerstroemia limii, and Lagerstroemia subcostata. These advances will facilitate the breeding of closely related Lagerstroemia species and deepen understanding on climatic adaptation of Lagerstroemia plants.

紫薇是重要的经济树种，具有观赏价值。在这项研究中，完整的叶绿体基因组序列紫薇“粉红丝绒”（紫薇“Pink Velour”）长度为 152,174 bp，GC 含量为 39.50%。它包含 85 个蛋白质编码基因 (PCG)、37 个 tRNA 和 8 个 rRNA 基因。检测到 207 个简单序列重复 (SSR) 和 31 个相对同义密码子 (RSCU) 值 > 1 的密码子。系统发育分析分为10紫薇将物种划分为进化枝A和进化枝B。我们进行了比较分析紫薇“Pink Velours”完整叶绿体基因组与六个密切相关的基因组紫薇来自不同来源的物种。除了 JSA 边界处 ycf1 核碱基的缺失外，所有 7 个物种的结构特征相似。大单拷贝（LSC）和小单拷贝（SSC）比IR区域具有更高的序列差异，并且有8个高度差异的基因（trnK-UUU,宠物N,聚苯乙烯,聚苯乙烯,ndhE,ndhD,NDHI,ycf1）已被鉴定并可用作未来研究中的分子标记。属于光合作用类别的基因存在高核苷酸多样性。单个核酸的突变主要受密码子使用的影响。 6 中非同义替换（Ka）和同义替换（Ks）的值百分比紫薇物种表明更多的光合作用基因仅在紫薇,紫薇， 和紫薇。这些进步将促进密切相关的育种紫薇物种并加深对气候适应的认识紫薇植物。