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. 2022 Jun 23;13:907363. doi: 10.3389/fpls.2022.907363

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Copyright © 2022 Wong, Hiscock and Filatov.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Examples of phenotypes and habitats of Senecio aethnensis, Senecio chrysanthemifolius, their natural hybrids and Senecio squalidus. (A) S. chrysanthemifolius from Mount Etna. (B) Natural hybrid on Mount Etna. (C) Homoploid hybrid species S. squalidus from Oxford, United Kingdom. (D) S. aethnensis from Mount Etna. (E) Natural habitat of Senecio on Mount Etna. (F) S. squalidus found on railways in the United Kingdom (identified by yellow arrows). (G) Variation in leaf phenotypes in one F₂ synthetic hybrid (between S. aethnensis and S. chrysanthemifolius) family. (H) Leaf shape variation in greenhouse-grown Senecio. Left most: S. chrysanthemifolius; Right most: S. aethnensis; All in-between: synthetic F₂ hybrids.