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Spinach (Spinacia oleracea) is a leafy green flowering plant native to central and Western Asia. It is of the order Caryophyllales, family Amaranthaceae, subfamily Chenopodioideae. Its leaves are a common edible vegetable consumed either fresh, or after storage using preservation techniques by canning, freezing, or dehydration. It may be eaten cooked or raw, and the taste differs considerably; the high oxalate content may be reduced by steaming. It is an annual plant (rarely biennial), growing as tall as . Spinach may overwinter in temperate regions. The leaves are alternate, simple, ovate to triangular, and very variable in size: long and broad, with larger leaves at the base of the plant and small leaves higher on the flowering stem. The flowers are inconspicuous, yellow-green, in diameter, and mature into a small, hard, dry, lumpy fruit cluster across containing several seeds. In 2021, world production of spinach was 32 million tonnes, with China alone accounting for 92% of the total. Originally from Persian the word aspānāḵ entered European languages from Latin, which borrowed it from Arabic. The English word "spinach" dates to the late 14th century from OF espinache. Common spinach (S. oleracea) was long considered to be in the family Chenopodiaceae, but in 2003 that family was merged into the Amaranthaceae in the order Caryophyllales. Within the family Amaranthaceae sensu lato, Spinach belongs to the subfamily Chenopodioideae. As opposed to the great majority of the flowering plants or plants used as vegetables, spinach is a dioicous plant, meaning different plants can have either female or male flowers. Pollination occurs via wind anemophily, because the flowers are small and green and thus they are unattractive to pollinators. Therefore, the pollen evolved to be very small and light so it can be transported to large distances, often miles away. Spinacia oleracea male flowers, spinazie mannelijke bloemen.jpg|Spinach male flowers Spinacia oleracea female flowers, spinazie vrouwelijke bloemen.

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Kale

Kale (keɪl), or leaf cabbage, belongs to a group of cabbage (Brassica oleracea) cultivars grown for their edible leaves, although some are used as ornamentals. Kale plants have green or purple leaves, and the central leaves do not form a head (as with headed cabbage). Kales are considered to be closer to wild cabbage than most of the many domesticated forms of Brassica oleracea. It is derived from wild mustard. Kale originates from Northern Middle English cale (compare Scots kail and German Kohl) for various cabbages.

Steaming

Steaming is a method of cooking using steam. This is often done with a food steamer, a kitchen appliance made specifically to cook food with steam, but food can also be steamed in a wok. In the American southwest, steam pits used for cooking have been found dating back about 5,000 years. Steaming is considered a healthy cooking technique that can be used for many kinds of foods. Because steaming can be achieved by heating less water or liquid, and because of the excellent thermodynamic heat transfer properties of steam, steaming can be as fast, or faster, than cooking in boiling water, as well as being more energy efficient.

Leaf vegetable

Leaf vegetables, also called leafy greens, pot herbs, vegetable greens, or simply greens, are plant leaves eaten as a vegetable, sometimes accompanied by tender petioles and shoots. Leaf vegetables eaten raw in a salad can be called salad greens. Nearly one thousand species of plants with edible leaves are known. Leaf vegetables most often come from short-lived herbaceous plants, such as lettuce and spinach. Woody plants of various species also provide edible leaves.

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