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通过对珙桐与喜树茎次生木质部的比较解剖学观察，发现两种植物次生木质部结构中导管的穿孔类型虽然都属于梯状穿孔板，但穿孔的长短和穿孔上的横隔数却存在明显的差别．珙桐的导管梯状穿孔板上的横隔有７７条，而喜树只有２６条．表明两者在系统发育上可能不是处在一个水平上．
Through the comparative anatomy observation of the secondary xylem in the virgin tree stem of Davidia involucrata, it was found that although the perforation types of the catheters in the secondary xylem structures of the two plants belong to the ladder-shaped perforated plate, the length of the perforation and the number of the transverse septa There are obvious differences. Davidia duct trapezoidal perforated plate on the diaphragm there are 77, while the camptotheca only 26. Suggesting that the two may not be phylogeny at a level.