Begonia introduction: Begonia flower is a unique plant in China and is known as the "national beauty". It mostly grows in plains and mountains, and can also be artificially introduced and cultivated. The leaves are alternate, elliptical to oblong, with a slightly acuminate apex, a wedge-shaped base, and blunt-toothed edges. The surface is dark green and shiny, the back is gray-green and pubescent, the petiole is slender, and there are two lanceolates at the base. Shape stipules. There are 5-7 flowers in clusters, umbel-shaped racemes, red when not open, gradually turning pink after opening, mostly semi-double, rarely single.