What tree has purple flowers on Guangzhou Airport Road?

Lagerstroemia speciosa, alias: Lagerstroemia speciosa, is a big tree of Lagerstroemia in Lysimachiaceae, with a height of 25m. Bark gray and smooth; Columnar, glabrous or slightly covered with furry hairs. Leaves leathery, oblong or ovoid, very large, sparsely lanceolate, blunt or short at the top, wide wedge-shaped to round at the base, and glabrous on both sides. Capsule spherical to obovate oblong, brown-gray, with many seeds. The flowering period is from May to July, and the fruiting period is10-165438+1October. [1] Gardens are often cultivated for viewing; Wood is hard, corrosion-resistant and bright red. It is often used in furniture, boats, bridges, telephone poles, sleepers and buildings, and also as a material in water. According to the cloud, its economic value can be compared with that of sleeve wood. Bark and leaves can be used as laxatives; Seeds are narcotic; Roots contain tannic acid and can be used as an astringent.