What are the morphological characteristics of bonsai in Wei Zi?

Morphological characteristics of Ziwei bonsai: deciduous shrubs or small trees. Lagerstroemia indica is a small tree, sometimes shrubby, 3 ~ 7 meters high; The bark falls off easily and the trunk is smooth. The young branches are slightly quadrangular and slightly winged. Leaves alternate or opposite, subsessile; Oval, obovate or oblong, 3-7 cm long and 2.5-4 cm wide, with a sharp or blunt tip and a wide wedge-shaped or round base, smooth and hairless along the main vein. Panicle terminal, 4 ~ 20 cm long; The flower diameter is 2.5 ~ 3 cm; Calyx 6-lobed, lobes ovate, smooth outside; Petals 6, red or pink, with irregular notches at the edge and long claws at the base; Stamens 36 ~ 42, outer 6 filaments longer; Ovary 6-loculed. The capsule is oval and spherical, 9 ~ 13mm long and 8 ~1mm wide, with 6 petals. Seeds have wings. The flowering period is from May to August, and the fruiting period is from July to September. The older the trunk, the brighter it is. When touched by hand, the whole plant quivers slightly, so it is also called itchy tree.