Abstract
The genus Quercus consists of about 450 species distributed throughout North temperate regions, the Mediterranean basin, and some montane tropics and subtropics. Although recent phylogenetic studies have provided the basis for an infrageneric classification of the genus, the species distribution in the Quercus complex is still a matter of debate (Nixon 1993). Hybridization and gene introgression produce many morphologically intermediate forms between pure parental species, as in Q. robur and Q. petraea. Little difference was found between these two species even in ribosomal DNA and chloroplast DNA polymorphism (Petit et al. 1993).
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