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Nymphaea nouchali var. caerulea, is a water lily in the genus Nymphaea, a botanical variety of Nymphaea nouchali. It is an aquatic plant of freshwater lakes, pools and rivers, naturally found throughout most of the eastern half of Africa, as well as parts of southern Arabia, but has also been spread to other regions as an ornamental plant. It was grown by the Ancient Egyptian civilization, and had significance in their religion. It can tolerate the roots being in anoxic mud in nutritionally poor conditions, and can become a dominant plant in deeper water in such habitats. It is associated with a species of snail, which is one of the main hosts of the pathogen causing human schistosomiasis. The underwater rhizomes are edible. Like some other species in the genus, the plant contains psychoactive aporphine alkaloids such as nuciferine, and possibly aporphine itself..