Monocots (monocotyledons) are characterized by having one cotyledon, or leaf, when they are young. Examples of monocots are grasses, lilies, palm trees, orchids and bananas. Dicots (dicotyledons) such as oak trees, daisies, roses, lentils, cacti, peanuts, beans and peas have two leaves when they are young. Monocots and dicots are different from each other in six main structural aspects which are their leaves, seeds, stems, flowers, pollen and roots.