Fortune Telling Collection - Ziwei fortune-telling - What is the name of this plant with opposite leaves?

What is the name of this plant with opposite leaves?

Ziwei, alias prurigo, ginger. It is a small deciduous tree, belonging to Litchi family, with smooth branches and blocky bark falling off in autumn and winter. Branchlets slightly quadrangular. The leaves are opposite or nearly opposite, oval, entire, sharp at the apex, wide and round at the base, smooth and hairless on the surface, and hairy on the back of the leaves along the midvein. The flowers are conically clustered at the top of the branches, and the perianth is shriveled, bright red, pink or white.