What is the scientific name of scratching trees?

Scratching the tree is Lagerstroemia indica. Lagerstroemia indica is a precious environmental protection plant in China. People call it "hundred-day red" and "scratching the itch tree" because it will tremble if it gently moves the bark. This is because this tree trunk is very sensitive to vibration. It is a deciduous tree with a height of10m. Panicles are inserted at the top of annual branches, and the inflorescence is very large, 30 ~ 50 cm long, with dozens or more flowers on it; Flowers are about 3 cm in diameter, including white, purple, red and purple; Every summer and autumn, each inflorescence can bloom for about 50 days, and the whole plant can bloom for up to 4 months. It is an excellent ornamental flower in the garden and one of the good varieties of stump bonsai.