Cross-fertilization and hybridisation rates.

Percentages of intraspecific and hybrid crossing: Qp (Q. petraea), Qr (Q. robur), hybrid crosses: female ♀ × male ♂. h: percentage of hybridisation among acorns with an assigned father. H/M: mean number of hybridisation events per mother (see Fig. 5: variation of the percentage of hybrid acorns per mother tree), SD: standard deviation. s: percentage of selfing.Qp = Q. petraea, Qr = Q. pubescens.