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File S1 Population acronyms, species, locations, ploidy levels, and number of individuals genotyped and sequenced (with the Genbank accession numbers) in the 42 investigated populations of -flowered buttercups (i.e., 33 R. kue p f e r i, t h r e e R. , four R. platanifolius and two R. seguie r i).

File S2 Mitotic metaphase of a pentaploid (2n=5x=40) (ALL3) of R. kuepferi.

File S3 ITS parsimony-splits network of the four -flowered buttercups species.

File S4 On the left, Inertias and second derivates of the -means analysis. On the right, likelihoods and second derivatives of the STRUCTURE analysis.

File S5 Scatterplots of the PCoA analysis of the AFLP with STRUCTURE clusters highlighted.

File S6 Geographical distribution of the seven STRUCTURE clusters within R. kuepferi. Cytotypes distributions, glaciation limits and south-western refugia are also indicated.

File S7 Ovule of a pentaploid (2n=5x=40) specimen of Ranunculus from the Southern Alps. In this specimen, the archespore aborted before meiosis (thin arrow) and only an unreduced asexual embyro sac will be produced from a cell of the nucellus (2n=5x=40; thick arrow).

File S8 Ovule of a tetraploid (2n=4x=32) specimen of Ranunculus from the Southern Alps. In this specimen, both asexual (thick arrow) and sexual (thin arrow) embyro sacs are produced synchronously. The thick arrow shows the aposphoric initial cell (2n=4x=32), whereas the thin arrow indicates the megaspore (n=2x=16).

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Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.