Genetic differences and hybridization between Calamagrostis arundinacea and C. villosa (Poaceae) in the anemo-orographic (A-O) system in the Karkonosze Mountains

Populations of Calamagrostis arundinacea (L.) Roth. and Calamagrostis villosa (Chaix ex Vill.) J.F. Gmel. were investigated by electrophoresis in respect of variability of six peroxidase loci. Anodally migrating allozymes discriminate between the species. Genotype frequencies of cathodally migrating loci prove to be very informative in the description of the hybridization process, attesting to unidirectional transfer of genes from C. arundinacea to C. villosa in some populations. The results are discussed in the context of hypotheses explaining the distribution of plants in mountain valleys.