Allium cepa L.
  • Sp. Pl.
  • Cultivated onion

This taxon is accepted by Amaryllidaceae
Notes: More details could be found in The Plant List v.1.1. Originally in The Plant List v.1.0

General Description

Bulb solitary or clustered, applanate-globose to cylindric-ovoid; tunic purple-red, brown-red, pale brown-red, or yellow to pale yellow, papery to thinly leathery, entire. Leaves shorter than scape, 0.5--2 cm wide, terete, fistulose. Scape developed or not, if developed then to 1 m, terete, conspicuously inflated below middle, fistulose, covered with leaf sheaths only at base. Spathe 2- or 3-valved, persistent. Umbel globose, densely many flowered or with bulblets and a few flowers. Pedicels equal, ca. 5 × as long as perianth, bracteolate. Perianth chalk white or white; segments with green or pale red midvein, oblong-ovate, 4--5 × ca. 2 mm. Filaments equal, slightly longer than perianth segments, connate at base for ca. 1/5 their length, adnate to perianth segments for 1/2 of connate part; outer ones subulate; inner ones broadened at base, 1-toothed on each side. Ovary subglobose, with concave nectaries covered by hoodlike projections at base. Style slightly exserted. Fl. and fr. May--Jul. 2 n = 16*, 32.

Bulbs 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, 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, fistulose, inflated below middle, 30–100 cm × 3–20 mm. Umbel 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 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 not known.

Allium cepa L., Sp. Pl. 300. 1753.

Hierbas bulbíferas, escaposas; bulbos solitarios o varios, hasta 10 cm de diámetro, tunicados, las túnicas externas membranáceas. Hojas basales, 1–10, envainadoras en la base, más o menos semicirculares en sección transversal, hasta 40 cm de largo y 2 cm de ancho. Escapo inflado en la parte inferior, 30–60 cm de largo; inflorescencia una umbela multiflora terminal con 2 ó 3 brácteas subyacentes reflexas más o menos connadas, pedicelos 1–26 mm de largo, flores actinomorfas; tépalos 6 en 2 verticilos de 3, libres, marcescentes, todos semejantes, angostamente lanceolados, 3–4.5 mm de largo y 2–2.5 mm de ancho, de color lila o blanco con la costa verde; estambres 6, exertos, filamentos adnados en la base a los tépalos, los 3 internos ensanchados y lobulados o dentados por ambos lados, anteras dorsifijas, introrsas, longitudinalmente dehiscentes; ovario súpero, 3-locular, estilo solitario, ginobásico, estigma diminutamente 3-lobado. Fruto una cápsula loculicida.

Cultivada; 50 m; fl ago; Araquistain 1; especie cuyas poblaciones nativas son desconocidas, hoy en día cultivada en todo el mundo. Género con ca 500 especies, principalmente del hemisferio norte. "Cebolla".

Bulbo simple, hasta por lo menos 15 cm de ancho, ampliamente ovoide a oblato. Hojas hasta ca. 2 cm deancho, cilíndricas, huecas. Escapo hasta ca. 120 cm, inflado. Fls. blanquecinas a rosadas.

Common Names

Cultivated onion

 Information From

World Flora Online Data. 2017.
  • A CC0 1.0 Universal (CC0 1.0).
MBG Floras Images
Flora images. Missouri Botanical Garden. Accessed on Jun. 2018.
  • B Missouri Botanical Garden
Flora Of CHina @
'Flora of China @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  • C Missouri Botanical Garden
Flora de Nicaragua
WD Stevens, CU Ulloa, A Pool and OM Montiel. Missouri Botanical Garden Press, 2001
  • D Missouri Botanical Garden
Manual de Plantas de Costa Rica
Hammel, B. E.; Grayum, M. H.; Herrera, C.; Zamora, N. Manual de Plantas de Costa Rica. Missouri Botanical Garden Press, 2003-2014
  • E Missouri Botanical Garden
Flora of North America @
'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  • F Flora of North America Association
World Flora Online consortium
World Flora Online Data. 2018.
  • G CC0 1.0 Universal (CC0 1.0).