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This study investigates the impact of hybridization and polyploidy in the evolution of eastern North American roses. We explore these processes in the Rosa carolina complex (section Cinnamomeae), which consists of five diploid and three tetraploid species. To clarify the status and origins of polyploids, a haplotype network (statistical parsimony) of the glyceraldehyde 3phosphate dehydrogenase (GAPDH) nuclear gene was estimated for polyploids of the complex and for diploids of sectiondoi:10.3732/ajb.93.3.412 pmid:21646201 fatcat:4tzqq42mqrf3tjfkklbjidaagu