The world's largest water lily Victoria amazonica is a national flower of which country?

Victoria amazonica is a species of flowering plant, the largest of the water lily family Nymphaeaceae. It is the national flower of Guyana. Its native regions are Guyana and tropical South America.

The Victoria amazonica has very large leaves, up to 3 m (10 ft) in diameter, that float on the water's surface on a submerged stalk, 7–8 m (23–26 ft) in length. It is the largest waterlily in the world. In their native habitat, the flowers first begin to open as the sun starts to set and can take up to 48 hours to fully open. These flowers can grow up to 40 cm (16 in) in diameter. Each plant will continue to produce flowers for a full growing season. All the buds in a single patch will begin to open at the same time and as they do, they give off a fruity smell.