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《Journal of Beijing Forestry University》 1998-01
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Comparison on the Anatomical Structure of Secondary Xylem in Stem Between Davidia involucrata and Camptotheca acuminata

Li Fenglan Cao Hongyu Li Junqing(College of Forest Resources and Environment,Beijing For.Univ.,100083,P.R.China)  
The anatomy of secondary xylem in stem with Davidia involucrata and Camptotheca acuminata was studied and compared. Even though the type of perforation in the terminal wall of vessels is scalariform ,there are obvious differences between the length of perforation plates and the number of bars on the scalariform perforation plates.The scalariform perforation plates in Davidia involucrata are formed by 77 bars ,but in Camptotheca acuminata , the scalariform perforation plates are formed by 26 bars. These results show that Davidia involucrata and Camptotheca acuminata stand in different level on the systemic position.To sum up we support A.L.Takhtajan's opinion that Davidia involucrata should be separated from Nyssa Family and to form a new familyDavidiaceae.
【Fund】: 北京市自然科学基金
【CateGory Index】: Q944
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