Rosa × kordesii

Rosa × kordesii, or Rosa kordesii, is a red type of rose that arose naturally from hybridization followed by chromosome doubling. A hybrid between R. rugosa and R. lucieae was created called Rosa 'Max Graf', but it was diploid and nearly sterile, producing flowers but no fruit. This rose produced a few viable seeds as a result of self-pollination, and the seedlings that resulted were tetraploid instead of diploid, i.e., the chromosomes of both pollen and