Perigynous flowers are found in

The correct option is Rose.

To understand why this is correct, let us break down the classification of flowers based on the position of the ovary and other floral parts relative to each other on the thalamus:

1. Hypogynous Flowers: In these flowers, the gynoecium occupies the highest position while the other parts (sepals, petals, and stamens) are situated below it. The ovary in such flowers is said to be superior. Examples include mustard, China rose, and brinjal.

2. Perigynous Flowers: In these flowers, the gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level. The ovary here is said to be half inferior. Common examples include plum, peach, and rose.

3. Epigynous Flowers: In these flowers, the margin of the thalamus grows upward enclosing the ovary completely and getting fused with it, and the other parts of the flower rise above the ovary. The ovary in this case is inferior. Examples include guava, cucumber, and the ray florets of sunflower.

Based on these definitions:
- China rose has hypogynous flowers.
- Guava and Cucumber have epigynous flowers.
- Rose has perigynous flowers.

Therefore, perigynous flowers are found in the Rose.