ABSTRACT
<p><b>OBJECTIVE</b>To establish identifying method for further development and utilization by studying botanic morphology and blooming characteristics of four varieties of roses in Jiangsu province.</p><p><b>METHOD</b>Flower-bud and flower-form were observed by dissection and plant modality and blooming process were investigated.</p><p><b>RESULT AND CONCLUSION</b>The flower form and plant modality was obviously different among the 4 varieties of roses. The process of differentiation of flower-bud could be divided into five stages: the transformation of nutritive growth cone, the occurrence and development of sepal, formation of petal primordium, formation of pistil and stamen. The blooming process was made up of flower-bud period, display-petal period, initiating blooming period, blooming period, withering period and corresponding biological marks.</p>