The flower in the image belongs to a dragon fruit cactus, likely from the genus Hylocereus. The specific type of dragon fruit (e.g., white-fleshed, red-fleshed, or yellow-fleshed) cannot be determined solely from the flower, as the fruit’s characteristics are identified after it develops. However, the flower resembles those of common Hylocereus undatus, which typically produces white-fleshed dragon fruit. For a precise identification, you’d need to observe the mature fruit.