The complete chloroplast genome sequence of Cynanchum forrestii Schltr. (Asclepiadaceae) and its phylogenetic analysis

Cynanchum forrestii is a folk medicinal plant in southwest China. In this study, we sequenced complete chloroplast (cp) genome sequence of C. forrestii to investigate its phylogenetic relationship. The whole cp genome of C. forrestii was 159,917?bp in length with 43.5% overall GC content, including a large single-copy (LSC) region of 91,189?bp and a small single-copy (SSC) region of 19,972?bp, which were separated by a pair of inverted repeats (IRs) of 24,378?bp. The cp genome contained 112 genes, including 78 protein-coding genes, 30 tRNA genes, and 4 rRNA genes. The phylogenetic analysis based on cp genome sequences showed that Cynanchum was closely related with Asclepias and Calotropis.