Phylogenetic relationships of the new species and its related species in Polygonatum, inferred from Maximum Likelihood (ML) and Bayesian Inference (BI) methods, based on the plastid genomes without one of the inverted repeats (IRa). Numbers on the branches indicate the bootstrap support of the ML and the posterior probability of BI analyses. The phylogenetic position of P. praecox is highlighted in red and P. caulialatum in brown. GenBank accession numbers are displayed after the species name.