Giant water lily

The giant water lilies of the genus Victoria are among the largest water lilies in the world. The genus includes three recognized species: Victoria amazonica, Victoria cruziana and Victoria boliviana, the largest known species. They are freshwater plants native to tropical South America, where they grow in lakes, wetlands and slow-moving waters. Their enormous circular leaves float on the surface and have raised rims that can reach several centimetres high.

The leaves of V. boliviana have reached 3.2 metres in diameter, while those of V. amazonica can approach 3 metres. Long underwater stalks anchor the leaves to the muddy bottom. On their undersides, a network of strong ribs and air-filled spaces provides buoyancy, while sharp spines help protect the plant. The flowers are almost as remarkable as the leaves. They open at night and are initially white and fragrant, then turn pink and close after their short flowering period.

In the wild, giant water lilies are pollinated by beetles. The flower attracts a beetle with its scent and heat, temporarily traps it, and later releases pollen that the insect can carry to another flower. After pollination, the developing fruit sinks beneath the water, where the seeds mature. Giant water lilies are also important in botanical gardens because their unusual size allows visitors to observe adaptations to life on water.

Although the plants are cultivated in many places, their natural populations depend on tropical freshwater habitats that can be affected by changes in water levels, pollution and habitat degradation. In 2022, Victoria boliviana was formally recognized as a distinct species after DNA analysis and the study of historical specimens.