In china rose the flowers are
Actinomorphic, hypogynous with twisted aestivation
The flowers of China rose are actinomorphic i.e. the flower can be divided into two equal halves by any vertical plane; hypogynous i.e. the ovary develops at the top of the convex/conical thalamus; twisted aestivation i.e. the margin of one petal overlaps the margin of the adjacent one.