Resources Investigation And Cultivar Classification Of Cerasus Mill

China has a high diversity of ornamental cherry in the world , is one of the distribution centers of Cerasus. The domestic cherry needs to be promoted and some good prospects can be seen. In fact, the cherry's further promotion and application are affected by incompleteness of cultivar -records,no standards and systems for cultivar classification. Therefore, the standards and systems for cultivar -classification, confirmed by the method of quantity classification, were discussed according to comparative morphology by the investigation of the cherry within the areas that exist many kinds of cherries.1 . On the foundation of predecessor's studies ,Conducted the morphology research to Cerasus , analysised important characteristic character of Cerasus, Formulated unified investigation standard, investigated in four cities incuding Nanjing, Wuxi, Beijing and Qingdao and clarified basically oriental Cerasus varietydistributed conditionfour at present of above four city. Determinated 54 species and cultivars, including 11 new cultivars.2.On the basis of investigation,classification system was discussed according to the origin and evolution of the cultivar, thus standards and principles for the classification of the cultivars were formulated with the results of five levels of classified standards (calyx tube and inflorescence type, wool quilt, flower and tree, young leaf color, pistil and stamen etc.)and three classified principles. And it was thought that calyx tube when division variety may take the first-rank level of classified standards. At the same time, according to ICNCP, three levels of classified ranks were formulated as followings: species, cultivar—Group, cultivar. Among the C. serrulata, it was divided into three ranks of classification as following:C. serrulata cultivar-group, C. serrulata var pubescens cultivar-group, C. serrulata var. Lannesiana cultivar-group (single cultivar-subgroup and double cultivar-subgroup). And the retrieval table was established according to the species and the classified standards for the investigated 54 cultivars. And the shape characteristics were recorded with details, including 11 new cultivars.3.According to"International Cultivated plant Naming Laws and regulations"(the ICNCP), all of the cultivars were adjusted from Prunus to Cerasus on the basis of check and reorganization of the cultivars recorded on the old literatures. At the same time, the C. serrulata var. lannesiana'Speciosa'and the C. serrulata var. lannesiana'Semiplena'-the F aberration were reorganized into cultivars. C. jamasakura'Pendula'was put into C. jamasakura. C. cerasoides var. campanulata'Hanying', was put into C. cerasoides var. campanulata, and C. serrulata var.lannesiana 'Amanogawa'was adjusted to C. serrulata var. lannesiana.4 . The results of Q -shape analysis was almost similar to that of basic morphology by quantity classification research within the selected 53 kinds and the cultivars, the observation trees. It also had been proved that it was very important to consider the calyx tube and the inflorescence type as the cultivar classifications. It was showed that there was almost no special relevance among the Cerasus various shapes and characteristics by R. analysis.5.Oriental cherry cultivar connoisseurship and cultural analysis ;Some analysis and discussion were carried out of present application of the oriental cherry in the present botanical gardens, and some suggestions also were provided.