What are some plants grown in water and eaten as food?

* Duckweed (_Lemna minor_) is a small, aquatic plant that is native to Europe, Asia, and North America. It is a common ingredient in soups and stews in many parts of the world.

* Watercress (_Nasturtium officinale_) is a spicy, aquatic plant that is native to Europe and Asia. It is often used in salads and sandwiches.

* Water hyacinth (_Eichhornia crassipes_) is a free-floating aquatic plant that is native to South America. It is an invasive species in many parts of the world, but it is also cultivated as a food crop in some areas.

* Lotus root (_Nelumbo nucifera_) is a long, starchy rhizome that is native to Asia. It is used in soups, stews, and curries.

* Water chestnut (_Eleocharis dulcis_) is a small, aquatic plant that is native to Asia. The corms of the plant are eaten raw, cooked, or dried.