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In many arctic plant groups, reticulate histories involving hybridization and polyploidization have resulted in problems with species delimitation and phylogeny reconstruction. The Saxifraga rivularis complex is a typical example. Two taxa, S. rivularis and S. hyperborea, have been reported from the arctic archipelago of Svalbard (‘Spitsbergen’), but their delimitation, relationship, and taxonomic...
Saxifraga opdalensis was described from Oppdal in southern Norway and hypothesized to have originated as the hybrid S. cernua×rivularis or to have been derived from a S. cernua -like progenitor. We tested these alternative hypotheses using uni- and biparentally inherited molecular markers observed in S. opdalensis and its putative parental species at the type locality: PCR-RFLPs (restriction fragment...
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