onion

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onion,

plant of the family Liliaceae (lilylily,
common name for the Liliaceae, a plant family numbering several thousand species of as many as 300 genera, widely distributed over the earth and particularly abundant in warm temperate and tropical regions.
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 family), of the same genus (Allium) as the chive (A. schoenoprasum), garlic (A. sativum), leek (A. porrum), and shallot (A. ascalonium). These plants are characterized by an edible bulb composed of food-storage leaves that are rich in sugar and a pungent oil, the source of its strong taste. The above-ground green leaves, typically long and tubular, are also eaten. All these species are believed to be native to SW Asia and are known to have been cultivated since ancient times. The onion (A. cepa), no longer found wild, is a biennial now grown in many varieties throughout the world as a table vegetable. Common varieties include the strong-flavored red onion, the milder yellow onion, and the bland white onion. Pearl onions are small white onions used for pickling. The large Spanish and Bermuda onions have a delicate flavor. The onion was grown extensively by the ancient Egyptians, in whose writings it is mentioned, and was later spread by the Spanish colonists. The more pungent garlic, a perennial, has a bulb consisting of small bulbils called cloves. This part is most often used in cooking, chiefly as flavoring; garlic is especially popular in the Mediterranean region and East Asia. Used as a folk remedy for thousands of years, scientific investigation is confirming garlic's usefulness as a blood thinner, antioxidant, and cancer preventive. The shallot (supposedly introduced to Europe from Ascalon, or Ashqelon, by the Crusaders, hence the botanical name) is a perennial with clusters of small onionlike bulbs. It and the more familiar leek, a biennial with a small single bulb, are both commonly used fresh in salads, as asparaguslike cooked vegetables, and in soups and stews. The leek, cultivated in ancient Egypt and probably introduced to England by the Romans, is the floral emblem of the Welsh, who adorn their hats with its leaves on St. David's Day. Scallion is a popular term for any edible Allium with a reduced bulb, especially the leek and shallot. The Welsh onion (A. fistulosum) is a leeklike plant popular in Asia. The chive, today found wild in Italy and Greece, is a hardy perennial sometimes used as an ornamental border plant. For flavoring, its leaves are the most desirable portion. Several species of Allium are native to North America, where the edible types were collected by Native Americans. The ramp or wild leek (A. tricoccum) has a garlicky onion flavor. Found in E North America, it has a narrow bulb, thin reddish stem, and two to three elliptical, lancelike leaves. It is prized as a spring vegetable and is overharvested in some areas. Because of the disagreeable odor and taste imparted to the milk of cows that feed upon them, some species are considered weeds, especially the common wild garlic, A. vineale, naturalized from Europe. Onion is classified in the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
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, class Liliopsida, order Liliales, family Liliaceae.
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onion

[′ən·yən]
(botany)
Allium cepa. A biennial plant in the order Liliales cultivated for its edible bulb.
Any plant of the genus Allium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

onion

1. an alliaceous plant, Allium cepa, having greenish-white flowers: cultivated for its rounded edible bulb
2. the bulb of this plant, consisting of concentric layers of white succulent leaf bases with a pungent odour and taste
3. any of several related plants similar to A. cepa, such as A. fistulosum (Welsh onion)
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Not every climate is great for growing bulb onions, and some years, unusual weather can lead to substandard crops.
Any variety of ordinary bulb onions grown from seed or sets will have better flavour and better keeping properties.
The bulb onions thrive well in warm to hot climates of 15-30oC with optimum temperatures for plant development ranging between 13oC and 24oC.
Alternative Onions Not every climate is great for growing bulb onions, and in some years, unusual weather can lead to substandard crops.
DA has suspended the importation of bulb onions pending the result of an investigation being conducted by the National Bureau of Investigation and the Philippine Competition Commission into a cartel allegedly forcing local onion producers to slash prices by as much as 50 percent.
"I begin prompting potential buyers on social media informing them that my produce will be ready in about 120 days," explains the farmer, who is now expecting some 90,000kg of bulb onions from the five acres.So, how does he manage to farm over the phone from that far?
Sow leeks in deep trays, bulb onions and cabbage in modules
If bulb onions aren't near the top of your shopping or garden-planting list, they should be.
4 Sow seed of spring cabbage and make later sowings of spring onions, finish feeding large bulb onions, lift and dry off shallots, order autumn-planting onion sets.
The Department of Agriculture (DA) has temporarily suspended the importation of bulb onions pending the result of an investigation into a cartel allegedly forcing local producers to slash prices by 50 percent.
Sow early veg - bulb onions and early cabbage sown in modules, leeks for September and October harvest in pots or deep trays Plant long-dormancy types of garlic such as Print anor Chit early seed potatoes by laying in trays in a light frost-free shed.