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Table S1. Previously unpublished microsatellite primer used for the breeding system analysis of pure G. urbanum and G. rivale populations. Tm = annealing temperature.

Table S2. Frequencies (standard errors) of microsatellite alleles at three loci in pure populations of G. rivale and G. urbanum and in ovules and outcross pollen pools for the four genotypic classes present in a Geum hybrid zone using the software MLTR (Ritland 2002).

Table S3. Mean and standard error of reproductive (number of seed heads) and vegetative (Rosette volume) performance of families of open pollinated offspring derived from four genotypic classes of maternal parents within a Geum hybrid swarm when grown in a randomized array in a common garden.

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