Zygomorphic : These are flowers that can only be divided into two equal halves by one particular vertical plane. An example is the flower of Cassia. Hypogynous : In these types of flowers, the gynoecium occupies the highest position while the other parts are situated below it. The flower is said to have a superior ovary and is hypogynous. An example of a hypogynous flower is mustard. Perigynous : In these flowers, the gynoecium is located in the center and other floral parts are located on the rim of the thalamus almost at the same level. The ovary here is said to be half inferior. Plum flowers are examples of perigynous flowers. Epigynous : In these flowers, the margin of thalamus grows upward enclosing the ovary completely and gets fused with it, the ovary is said to be inferior as the other floral parts are situated above the ovary. An example of an epigynous flower is cucumber.