Genus Nyctaginia is a group of flowering plants that belong to the family Nyctaginaceae. They are commonly known as night-blooming flowers because they open their petals at dusk and close them at dawn. This genus is also referred to as "moonflowers" because of their large, white, fragrant blossoms that resemble the moon. Some other synonyms for Nyctaginia are "mexican-wedding-cake," "four-o'clocks," and "evening primroses." These plants are native to the Americas and can be found in a variety of habitats, including deserts, forests, and coastal areas. The rich diversity of Nyctaginia species adds to the beauty and biodiversity of our planet.