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A summary model of intersectional hybridization and polyploid formation in Crataegus section Douglasia, based on our analyses of ITS2 and plastid DNA sequences. This diagram thus does not include the way in which C. douglasii has contributed to the formation of polyploid C. suksdorfii (Lo et al., 2010). It also does not show the triploid bridges implicitly involved in the formation of tetraploids from crosses between diploid and tetraploid parents.
