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mdash; More than 70 trees belonging to the morphologically distinguishable species Quercus robur L and Quercus petraea (Matt) Liebl were sampled in a mixed stand located in western France. The ribosomal DNA repeat was characterized by a high level of length polymorphism; while chloroplast DNA in our sample was nearly fixed at 2 previously identified polymorphic regions. Overall, very little differentiation was found between species using both markers. The implications for our understanding of this complex of species are discussed.

Ribosomal DNA and chloroplast DNA polymorphisms in a mixed stand of Quercus robur and Q petraea