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Spinach is an edible flowering plant in the family Amaranthaceae native to central and western Asia. Its leaves are eaten as a vegetable.
Common spinach, S. oleracea, was long considered to be in the family Chenopodiaceae, but in 2003, that family was merged into the family Amaranthaceae in the order Caryophyllales. Within the family Amaranthaceae sensu lato, Spinach belongs to subfamily Chenopodioideae.