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The potato onion (also known as an Egyptian onion, underground onion [1] or multiplier onion) [2] is a group of varieties [3] which Maud Grieve calls Allium × proliferum [1] but has also been classed in the Aggregatum Group of Allium cepa, similar to the shallot. [3]
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He placed Allium in a grouping he referred to as Hexandria monogynia (i.e. six stamens and one pistil) [9] containing 51 genera in all. [10] In 1763, Michel Adanson, who proposed the concept of families of plants, included Allium and related genera as a grouping within Liliaceae [11] as Section IV, Les Oignons (Onions), or Cepae in Latin. [12]
Allium triquetrum produces stems 17–60 cm (6 + 3 ⁄ 4 – 23 + 1 ⁄ 2 in) tall, which are concavely triangular in cross-section. Each stem produces an umbel inflorescence of 4–19 flowers during winter and spring. [7] The tepals are 10–18 mm (13 ⁄ 32 – 23 ⁄ 32 in) long and white, but with a "strong green line". [8]
Allium perdulce, the Plains onion, is a plant species native to the central part of the United States and cultivated as an ornamental elsewhere. [1] It has been found in Texas, New Mexico, Oklahoma, Kansas, Nebraska, South Dakota, and one county in western Iowa (Woodbury County). [2] [3]
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Allium caeruleum (blue globe onion, blue ornamental onion, blue-of-the-heavens, blue-flowered garlic; syn. Allium azureum Ledeb.) is an ornamental bulbous plant of the onion genus, native to Central Asia (Kazakhstan, Kyrgyzstan, Siberia, Tajikistan, Uzbekistan, and Xinjiang). [3] [4] [5] In these regions, it is found on dry slopes, plains, and ...
Allium unifolium, despite its name, usually has 2–3 flat leaves up to 50 cm long. Bulbs, though, are usually solitary, egg-shaped, up to 2 cm long, often formed at the end of rhizomes spreading out from the parent plant. Scapes are round in cross-section, up to 80 cm tall.