Abstract
Natural hybridization between the native speciesRumex madaioendemic to Japan and the congeneric invasive speciesR. obtusifolius, which frequently co‐occurs withR. madaio, was examined by molecular identification. At low frequencies, interspecific hybrids between the two species were confirmed using restriction fragment length polymorphism analyses of the internal transcribed spacer region of ribosomal DNA. Whereas these two species can hybridize because their flowering periods overlapped to some extent, the extremely low fertility ofR. madaiocaused by unknown genetic factors seemed to prevent extensive hybridization between these species. Population genetic analyses based on single nucleotide polymorphisms showed that there was a distinct population genetic structure inR. madaio, suggesting that local populations should be treated separately for genetic conservation of the species.
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