What is this tree with purple flowers?

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.