chinese porcelain

by Rita DiNapoli
(Pinehurst, NC)

I have some 20th century chinese porcelain. It has a black background with a dark rose colored flower in the center of the plate with yellow flowers and greenery and some carnelian colored flowers. A greek key design in the colors on the plate surround the edges with gold
trim. There is a tea service to match. The marking on the bottom is a square with Chinese characters inside.
Any ideas?