| Wintersweet (Chimonanthus praecox Link),the special plant of China , is one of the famous and precious flower plants which have long cultural history.It is useful and has huge economic value. Base on the overall investigation of the cultivars resources of Wintersweet in Jiangsu,the paper recorded the existing cultivars and presented cultivars morphological classification. Other species in Wintersweet and other generas as Calycanthus and Sinocalythus is also investigated. The main results are as follows: (一)Research on the resources of Wintersweet cvs in Jiangsu On the basis of investigations and researches on cultivars resources of Wintersweet in Jiangsu Province during the last two yeas .73cultivars are recorded,among them, including 60 of Praecox group,11of Albus group,2 of Viridiflorus group.Characters of each cultivar are described. (二)Research on cultivars classification of Wintersweet Based on the studies on cultivar resources of Wintersweet,the paper divided them into 3 groups: Praecox group,Albus group,Viridiflorus group,drew up a simple but pratical key to classification. The paper divided Praecox group into 3: Concolor ,Intermedius,Patens; Albus group into 3: Albus concolor,Albus intermedius,Albus patens;Viridiflorus group into 2: Viridiflorus concolor,Viridiflorus intermedius. (三)Appraisal system on gardening characters for Wintersweet cultivars A multifactorial appraisal system based on the Analytic Hierarchy Process was developed for Wintersweet cultivars. Appraisal criteria were judged according to the gardening characteristics of Wintersweet. This system is good in flexibility and accuracy. Based on a systematic investigation of 40Wintersweet cultivars,a mode of multileveled structures for the resources of Wintersweet cultivars has been constructed,analyzed the Wintersweet cultivars suitable to be planted as garden trees. According to the results,the paper posed that we should amplify different researches about Wintersweet and exploit further resources of Wintersweet. |
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