Abstract
This article presents literary review and results analysis of evaluation of representative set of oat accessions of all Avena L. species. Results of complex study of major morphological characters and utilization of the karyotype structure data confirmed by the results of RAPD and avenin spectrum analysis are presented. Relationships of genomes of different Avena species at each ploidy level are discussed. Two genomes form the base of all Avena species, namely the A and C genomes. Results of the evaluation of several characteristics of the oat species and their geographical distribution are analysed. Probable evolutionary pathway of Avena species are suggested. Most likely the centres of origin of genus Avena L. are determined.
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