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Study on the Species Resource and Classification system of Yulania denudata

SUN Jun et al(Forestry Bureau of Nanzhao Courity of Henan Province,Nanzhao,Henan 474650)  
Yulania denudata was classified and investigated systematically.Based on International Code of Nomenclature for Plants,International Code of Nomenclature for Cultivated Plants and morphological characteristics of Y.denudata,the authors pointed out that Y.denudata included 2 subspecies(1 original subspecies,1 new distribution subspecies),9 varieties(6 original varieties,2 new varieties and 1 new translated combination variety),10 groups(1 original group,9 new groups),37 cultivars(1 original cultivar,26 new cultivars,8 new translated combination cultivars and 2 new combination cultivars).And the authors put forward a new classification system of Y.denudata: Species→subspecies→variety and species→group→cultivar.
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