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. 2022 Apr 13;13:1987. doi: 10.1038/s41467-022-29643-4

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© The Author(s) 2022

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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Fig. 6 — a, b Two selected RI-related PSGs of sect. Distegocarpus derived from sect. Carpinus (a) and Ostrya (b) respectively. ML trees were constructed based on haplotypes of protein sequences from all re-sequenced individuals. Each branch represents one identified haplotype. c The LUG gene showing hybrid signals because of hybrid recombination. All inter-lineage fixed amino acid differences were shown. d A simplified model of an ancient intergeneric HHS event between two genera and further species diversification. Representative morphologies of nutlet bracts from three lineages are shown on the right (Top: sect. Carpinus; middle: sect. Distegocarpus; bottom: Ostrya). In (a–c), the different background colors indicate the alleles (a, b) and mutations (c) of sect. Distegocarpus derived from sect. Carpinus (blue) and Ostrya (green).