This dataset is composed of 4 files : The file EcologyG1&G2 provides ecological data assessed on the level of each tree (G1 and G2) and derived from a floristic survey. Details about the assessments of the ecological data are provided in Truffaut et al (2017, Article p. 127 and Supplemental material Methods S2) The file GenotypesSNP_G1_G2 comprises the SNP data of G1 and G2 trees, their geographical coordinates and species assignation. This data set was used to estimate fitness, and for performing parentage analysis. The file Phenotypes_G1 comprises all the phenotypic data of the trees of the G1 generation. The file Phenotypes_G2 comprises all the phenotypic data of the trees of the G2 generation.