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Any plant of a large genus (Allium) of bulbous, onion- or garlic-scented herbs of the Alliaceae family, including the onion, garlic, chive, leek, and shallot. Allium species are found in most regions of the world except the tropics and New Zealand and Australia. Some are cultivated as ornamental border plants.
This entry comes from Encyclopædia Britannica Concise. For the full entry on allium, visit Britannica.com.