Investigation And Evaluation On The Cultivar Resources Of Tianpeng Tree Peony

Pengzhou,called Tianpeng in Sichuan province in the past,is one of the three Tree Peony habitats in China recently.It's the cultivation center of Cultivar Group of Tree Peony from Southwest.This work investigated Tianpeng tree peonies cultivar resources,and synthetically evaluated each cultivar by Grey System Theory,which is to study the present situation of cultivar resources,and find out the evaluation system which suit for tree peonies.According to the investigation,there are twenty cultivars in Tianpeng tree peonies, such as Paeonia suffruticosa 'Hongyun Bai','Lvyun Bai','Wuxing Yu','Qixing Yu','Baxing Yu','Dianjiang Hong','Yanzhi Hong','Meigui Xiang', 'Fenzi Changtiao','Fenzi Ban','Pengzhou Zi','Yanzhi Lou','Zui Xishi', 'Jinyao Lou','Danjing Yulou','Xuesi Hong','Hongyao Lou','Taiping Hong','Yanyu Chonglou','Zi Xiuqiu'.The flowers are large,with five color systems in red,white,pink,purple,violet,most of which are covered with the mauve spots on the base of petals;they have seven flower types including Simple Form,Crown Form, Lotus Proliferate-Flower Form,Rose Proliferate-Flower Form,Crown Proliferate-Flower Form,Cabinet Layered Prolification Form,Globular Proliferate-Flower Form,and the cultivar of Prolification Flower Section is 90 percent of the double petal cultivars,with a high degree of evolution.Their peduncles are long, whose flowers haver a litter drooping or slightly hide in the leaves.Some cultivars have rose fragrance.They are usually tall,mostly upstanding and semi-spreading.The new branchlets are long.Leaves mostly are big-round and big-long,more than 40cm in length,at an angle of about 30-50 degrees to the stem.Proximal leaves 2-ternate. with back nearly glabrous.Proximal of latera leaflets are obviously asymmetry. Common petioles and petiolules are long,lateral leaflets's angular divergence are usually greater.Branches and leaves seems not luxuriant.Grey System Theory is firstly used to the evaluation of peonies cultivar resources. Twelve indexes are chosen,such as diameter,color,type,florescence,and so on,then a standard cultivar is constructed.These twenty Tianpeng tree peonies are synthetically evaluated by grey relational analysis.The results showed that the synthetic quality followed by the merits as a sequence is:'Danjing Yulou','Baxing Yu','Hongyun Bai','Lvyun Bai','Fenzi Ban','Pengzhou Zi','Wuxing Yu','Zi Xiuqiu','Yanyu Chonglou','Dianjiang Hong','Qixing Yu','Hongyao Lou','Meigui Xiang','Jinyao Lou','Fenzi Changtiao','Taiping Hong', 'Yanzhi Lou','Xuesi Hong','Yanzhi Hong','Zui Xishi'.