Monadelphous or Monodelphous Flowers are called as epipetaloid flowers.
As they are in a bundle
China rose stamens are referred to as epipetaloid because they are attached to the petals rather than the receptacle or the base of the flower. This characteristic is observed in certain species where the stamens appear to arise from the petals, contributing to the flower's overall structure and aesthetic. This adaptation can enhance pollination by making the reproductive parts more accessible to pollinators.