Original sentence: All water lilies are poisonous and contain an alkaloid called nupharin in almost all of their parts, with the exception of the seeds and in some species the tubers.In China the tubers were eaten cooked.In India it has mostly been eaten as a famine food or as a medicinal (both cooked), but in one area the dried rhizomes were pounded into a sort of bread, and the tubers are often eaten in the floodplains.In Sri Lanka it was formerly eaten as a type of medicine and its price was too high to serve as a normal meal, but in the 1940s or earlier some villagers began to grow water lilies in the paddy fields left uncultivated during the monsoon season (Yala season), and the price dropped.In Vietnam rhizomes were eaten roasted.In West Africa, usage varied between cultures, in the Upper Guinea the rhizomes were only considered famine foods -here the tubers were either roasted in ashes, or dried and ground into a flour.In a North American species, the boiled young leaves and unopened flower buds are said to be edible.In some species the rhizomes and tubers are eaten after boiling has neutralised the nupharin.In the 1950s there were no records of leaves or flowers being eaten.Nonetheless there is a Polish poem by Juliusz Słowacki in which the rhizomes are eaten.Some tribes ate the rhizomes raw.The Ancient Egyptians ate them boiled.The Buduma people ate the seeds and rhizomes.The European species contain large amounts of nupharin, and are considered inedible.The amount of nupharin in the leaves and stalks appears to vary seasonally in European species.The plants were also said to be eaten in the Philippines.The tubers are called manel here and eaten boiled and in curries.The tubers of Nymphaea gigantea of Australia were roasted by certain tribes, these turn the colour blue when boiled, the tubers of other species were also roasted elsewhere on that continent.The tubers of a number of Australian, Asian and African species are completely edible, during the dry season some consist almost entirely of starch.The tubers of all occurring species were eaten in West Africa and Madagascar (where they are called tantamon for blue and laze-laze for white), usually boiled or roasted
Edited sentence: The young leaves and unopened flower buds can be boiled and served as a vegetable.Water lilies have several edible parts