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. 2020 Jun 23;10:10137. doi: 10.1038/s41598-020-67264-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Phylogenetic relationships of 39 species inferred from maximum likelihood (ML) analysis based on the complete chloroplast genome sequences. The numbers above the nodes are the support values with maximum likelihood (ML) analyses, and the symbol * indicates that the support rate of the branch is 100%. Clade I (orange): P. tenella, P. pedunculata, P. triloba and P. tomentosa; clade II (yellow): P. mongolica, P. tangutica and P. davidiana; clade III (light blue): P. dulcis, P. persica and P. kansuensis.