Table S1. Genotypes used, with the constitution of natural variants of germination and flowering-time alleles and their corresponding phenotypes under laboratory conditions.

Table S2. Results of analysis of variance that test for interactions between alleles and seed-maturation conditions (maternal) or dispersal seasons (dispersal).

Figure S1. Relationship between germination timing and flowering time (days between germination and flowering) for the three dispersal cohorts.

Figure S2. Epistasis for fitness.

Figure S3. Recorded temperature and precipitation by NOAA ( from the Bedford, MA Station spanning the whole duration of the experiment.

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