What is the double-layered jujube tree like?

According to Strange Tales from a Lonely Studio, there is a strange jujube tree in Wu Yang Township, Danzhai County, Guizhou Province, which is located 400 meters away from the road in front of the township government.

This jujube tree has a DBH of about 50cm, a height of 15m and a crown width of 9 m. The trunk branches 2.5 meters from the ground, and the center of the tree is about 7 meters, which is also a completely different dividing line between the upper and lower parts of the tree. In the lower part of the dividing line, the tree bears fruit, leaves are like Pinus massoniana, and the seasons are evergreen; The upper part is jujube leaves, which shed leaves in winter, and there are big and round dates in summer and autumn, which are crisp and sweet.