The medicinal plant Delphinium albocoeruleum is rich in diterpenoid alkaloids， and possesses significant medicinal and ecological values. However， studies on the characteristics of its chloroplast genome and systematic taxonomic status still remain scarce. In this study， the complete chloroplast genome of this species was sequenced and characterized for the first time， and comparative analyses within Delphinium and related taxa were also conducted. The results indicated that the chloroplast genome of D. albocoeruleum had a total length of 154 258 bp， and exhibited a typical quadripartite structure， including a large single copy （LSC） region of 84 847 bp， a small single copy （SSC） region of 16 301 bp， and an inverted repeat （IR） region of 26 555 bp. The total GC content was 38.25%. A total of 131 genes were annotated， including a unique ycf1 pseudogene， which presented a boundary differentiation pattern characterized by truncation at the IRb/SSC boundary and intact function at the SSC/IRa boundary. We identified 243 simple sequence repeats （SSR） loci， with 67.1% of these SSR loci concentrated in the LSC region and A/T mononucleotide repeats being the dominant type. Furthermore， seven positive selection genes （e.g.， matK， ndhD） and 15 highly divergent regions （Pi>0.020） were detected， indicating that the genome was overall conserved but local variations. Phylogenetic analysis demonstrated that D. albocoeruleum had the closest genetic relationship with D. candelabrum. These results provide an important basis for research on the phylogeny， genetic evolution， and geographical origin of the tribe Delphineae.

Delphinium albocoeruleum  /  Chloroplast genome  /  Phylogenetic analysis  /  The tribe Delphineae