Complete Chloroplast Genome Sequence and Phylogenetic Analysis of .

We sequenced and analyzed the complete chloroplast genome of (family Asteraceae), a Chinese herb used medicinally to relieve coughs and reduce sputum. The chloroplast genome was 152,992 bp in size, and harbored a pair of inverted repeat regions (IRa and IRb, each 24,850 bp) divided into a large single-copy (LSC, 84,698 bp) and a small single-copy (SSC, 18,250 bp) region. Our annotation revealed that the chloroplast genome contained 115 genes, including 81 protein-coding genes, 4 ribosomal RNA genes, and 30 transfer RNA genes. In addition, 70 simple sequence repeats (SSRs) were detected in the chloroplast genome, including mononucleotides (36), dinucleotides (1), trinucleotides (23), tetranucleotides (1), pentanucleotides (8), and hexanucleotides (1). Comparative chloroplast genome analysis of three species indicated that a higher similarity was preserved in the IR regions than in the LSC and SSC regions, and that the differences in the degree of preservation were slighter between and than between and . Phylogenetic analysis revealed that was more closely related to than to . Our findings offer valuable information for future research on species identification and selective breeding.