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. 2020 Dec 3;10:21178. doi: 10.1038/s41598-020-78145-0

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Ancestral area reconstruction for the genus Acer based on the combined data matrix (nuclear ribosomal ITS, plastid psbA-trnH spacer, rpl16 intron, and trnL-trnF spacer). The one- and two-letter codes in the inset represent different geographic ranges. The map shows the geographical extents of the four areas ((A) Asia, (B) Euro-Mediterranean, (C) western North America, (D) eastern North America) considered in the analysis. The pie charts on the nodes show the most likely ancestral areas (correspond to the colors in the inset) as reconstructed by BioGeoBEARS. Current distributions are indicated before the species names. Branches 1–5 represent five migration events of Acer. The diagram was generated by Microsoft PowerPoint 2019 (https://www.microsoft.com/zh-cn/microsoft-365/powerpoint).