genetics in relation to agriculture livestock heredity variation biology plant breeding fig 126four types of rose a typical modern hylirid tea rose b typical hybrid perpetual rose c the damask rose which was popular in old gardens d the old single rosa gallica re produced from the garden magazine by ijcrmission creation of varieties of the roseno finer examples of the origin of horticultural varieties by means of hybridization could be found than the garden roses of today the genus rosa is widely distributed in the northern hemisphere and contains several hundred s rdyw6m.jpg from rosé blackbink View Photo