Introduction to the Palm Tree Community: There is another tropical plant in Longdong Slope - the Palm Tree. This tree is as hard as iron. It naturally forms iron-pointed corners within two to three meters from the ground to the tree trunk. After a census, there are still more than 20 palm trees in Ziyang Longdong. Legend has it that in ancient times, Yue Fei fought against the Jin Dynasty, and the mace held by General Jin Wushu at that time was a weapon made from this tree. Why these tropical plants can grow in Ziyanglong Cave is also a mystery.