Fig. S1 Bayesian structure analysis of Medusagyne oppositifolia with the STRUCTURE software. Bars represent individual Medusagyne oppositifolia trees with their assignment proportions (y axis) to the different clusters. 1 = Mt. Jasmin, 2 = Mt. Sebert, 3 = Copolia, 4 = Bernica, for population assignment see Fig. 1. Performing the analysis for (a) K_5 (5 different grey shades) and (b) K_4 (4 different grey shades).

Table S1 Summary table of results of pollination experiments. Fruit set, seed set and survival rates are given in mean proportions ± SE. S = Selfed individuals, W = Within population crosses, B = Between population crosses, N = Bagged individuals with no hand pollination. Fruit set is defined as the proportion of flowers that developed into fruits. Viable seed set is defined as the proportion of developed seeds; Seed set as the proportions of maximum potential seeds. Significant differences between treatments B and W are indicated as: * = p < 0.05; *** = p < 0.001

Table S2 Allele frequencies lower 0.05 for adults and seedlings at the Bernica population. Marked in bold are alleles that are present in the adults but not in the seedlings

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