Chloroplast genome, one of three plant genetic systems, has a character of single-copy andmaternally inherited. Its recombinant and intraspecific variation occurs rarely, while its evolutionaryroute is independent for it is undisturbed by missing gene, overlapping gene and pseudogenes. What'smore, Chloroplast genome's nucleotide substitution rate is moderate, while its evolutionary rates ofnon-coding region and coding region are different, so that it can be used to study the evolution'srelationship of diffe...