What kind of plant is this? These flowers are beautiful. This was taken in Xi 'an Qujiang Ruins Park (South Lake).

Lythrum japonicum is also known as willow, willow and Ye Lian. Lysimachia of Lysimachiaceae. Perennial emergent herbs. The plant height is about 1 m, the stem is quadrangular, erect and multi-branched, and the leaves are opposite or whorled, lanceolate. The long spike is terminal, and the small flowers are numerous and dense, purplish red, and bloom in summer and autumn. Natural species grow in swamps, ditches or beaches. Like light, humid and well-ventilated environment, salt and alkali tolerance, and grow better in fertile and loose soil. The whole plant can be used as medicine to treat dysentery, enteritis and other diseases; In addition, it has a hemostatic effect on trauma. Chinese name: Latin scientific name: Spiked Loosestrlfe, alias: whipweed, chlorpyrifos; Boundaries of Lysimachia: Plants: Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; Lysimachia; lythrum salicaria