This is a kind of lilac tree, belonging to subtree, commonly known as Marcello Malpighi tree. Its trunk is purple-gray-black, with fine cracks, and its single leaf is opposite, which can reach more than ten meters high. Wood has a special aromatic smell, and its flowers, branches and leaves can be used as medicine. It's just that trees are hard to grow, but this kind of wood can prevent insects and moths. It is distributed in the hilly land and beside the river ditch in the deep mountain forest area of Raohe County at the foot of Wanda East, and the annual output of leaves and flowers is above 100 tons. The flowers and leaves of begonia have the special effects of refreshing, relaxing muscles and activating collaterals, promoting blood circulation, delaying aging and prolonging life. They are eaten in the form of tea and have a unique smell called strange tea.