Allium praecox |
Allium cepa |
|
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early onion |
cultivated onion, garden onion |
|
Bulbs | 1–3, increase bulbs absent or ± equaling parent bulbs, never appearing as basal cluster, not clustered on stout primary rhizome, ovoid to globose, 1–1.8 × 1–1.7 cm; outer coats enclosing 1 or more bulbs, gray-brown to brown, prominently cellular-reticulate, membranous, cells arranged in ± vertical rows, forming irregular herringbone pattern, transversely elongate, V-shaped, without fibers; inner coats white, cells obscure, ± transversely elongate, contorted. |
1–3, not rhizomatous, mostly depressed-globose, varying in size from cultivar to cultivar, 5–8 × 3–10 cm; outer coats enclosing 1 or more bulbs, yellowish brown, red, or white, membranous, without reticulation; inner coats white to pink, cells obscure to quadrate. |
Leaves | persistent, withering from tip by anthesis, 2–3, basally sheathing, sheaths not extending much above soil surface; blade solid, flat, broadly channeled, carinate, 20–75 cm × 5–10 mm, margins entire. |
persistent, 4–10, sheathing proximal 1/6–1/4 scape; blade fistulose, usually ± semicircular in cross section, 10–50 cm × 4–20 mm. |
Scape | persistent, solitary, erect, solid, terete, 20–60 cm × 2–4 mm. |
persistent, solitary, erect, fistulose, inflated below middle, 30–100 cm × 3–20 mm. |
Umbel | shattering after seeds mature, each flower deciduous with its pedicel as a unit, erect, loose, 5–40-flowered, hemispheric, bulbils unknown; spathe bracts persistent, 2, 5–7-veined, lanceolate to lance-ovate, ± equal, apex acuminate. |
persistent, erect, compact, to 500-flowered, globose, bulbils occasionally found; spathe bracts caducous, 2–3, 3–4-veined, ovate, ± equal, apex acute to acuminate. |
Flowers | stellate, 6–13 mm; tepals spreading at anthesis, white to pale pink with purple midveins, lance-ovate to ovate, ± equal, becoming papery and connivent over capsule, margins entire, apex acute, obtuse, or emarginate; stamens included; anthers purple and yellow; pollen yellow; ovary crested; processes 3, central, 2-lobed, minute, margins entire; style linear, equaling stamens; stigma capitate, scarcely thickened, unlobed; pedicel 15–40 mm. |
stellate to campanulate to urceolate, 3–7 mm; tepals erect to ± spreading, white to pink with greenish midveins, withering in fruit, margins entire, apex obtuse or acute, outer ovate, inner oblong; stamens exserted; anthers white; pollen white; ovary crestless; style linear, ± equaling stamens; stigma capitate, unlobed; pedicel 10–50 mm. |
Seed | coat shining; cells minutely roughened. |
coat not known. |
2n | = 14. |
|
Allium praecox |
Allium cepa |
|
Phenology | Flowering Mar–May. | Flowering Jun–Aug. |
Habitat | Clay soil on shaded, grassy slopes near coast | Disturbed sites adjacent to areas where cultivated |
Elevation | 50–800 m (200–2600 ft) | 0–500 m (0–1600 ft) |
Distribution |
CA; Mexico (Baja California)
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AR; CA; KS; LA; MT; OR; TX; WA; cultivated in Europe; Asia
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Discussion | The onion of commerce, Allium cepa is widely cultivated as a biennial in North America, Europe, and Asia. It is unknown in the wild and is probably derived from A. oschanini of central Asia. The cultivated form is often polyploid (2n = 16, 32, 54) and possibly of hybrid origin. It exists in numerous cultivars, a few of which form large bulbils in the umbel. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 26, p. 263. | FNA vol. 26, p. 244. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. hyalinum var. praecox | |
Name authority | Brandegee: Zoë 5: 228. (1906) | Linnaeus: Sp. Pl. 1: 301. (1753) |
Web links |