Jasmine flowers have a small number of ovules and short filaments for stamens. Neither the carpels nor the stamens mature at the same time. Self-pollination is impossible in such circumstances. Even flowers with few stamens and short pistils, such as tulips, are difficult to see.The ovaries of some flowers may be difficult to see. Epigynous flowers are described as having inferior ovaries connected below the main floral components. The rest of the carpel and stigma may nevertheless be superior to the stamen in such blooms. Such blooms have flask-shaped thalamus. Orchids, bananas, apples, and melons are all epigynous flowers. Hypogynous flowers are those in which the ovaries and carpel are higher than the stamen. Hypogynous blooms can be found on tulips, mustard, and tomatoes. Their thalamus is shaped like a cone. Perigynous flowers have stamen, petals, and sepals that encircle the ovaries, and the thalamus is disc-shaped. Perigynous flowers give rise to prunes, cherries, roses, and plums.