For the identification of the vernalisation response gene determining spring growth habit of the Siberian variety ‘Onokhoyskaya’ crosses were initiated between ‘Onokhoyskaya’ and ‘Petka’, the latter is carrying Sp1 and between ‘Onokhoyskaya’ and the two winter ryes ‘Moskovskij Karlik’ and PC361’. Both by allelic test cross and RFLP mapping it is clearly demonstrated that the Siberian rye is carrying a vernalisation response gene allelic to Sp1, however, weaker in expression. The homoeologous relationships to vernalisation response genes (Vrn) of other Triticeae members are discussed. A new nomenclature for the Vrn genes in rye according to the recommended rules for gene symbolisation in homoeologous sets is proposed.