|University of California, Berkeley|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Alliaceae||View Description||Dichotomous Key|
|Genus: Allium||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Allium cepa L.
Habit: Bulb 5--8 cm, 3--10 cm wide; +- depressed-spheric; outer coats surrounding >= 1 bulbs, white, +- yellow, brown, or red; sculpture 0. Stem: 30--100 cm, hollow, inflated below middle. Leaf: 4--10, sheathing proximal 1/6--1/4 of stem, 10--50 cm, 4--20 mm wide, hollow, generally +- semicircular in ×-section. Inflorescence: flowers generally 150--500; pedicels 2--5 cm. Flower: 3--7 mm, star- to bell- or urn- shaped, white to pink or lt green, withering in fruit, perianth parts oblong to ovate, obtuse to acute; stamens exserted; ovary crests 0. Chromosomes: n=8,16,27.
Ecology: The onion of commerce, found along roadsides, disturbed places near where plants are grown commercially or along routes of transport; Elevation: < 500 m. Bioregional Distribution: Found wherever onions are cultivated. Flowering Time: Jul--Aug Note: Bulb size, outer coat color varies among cultivars; bulblets replacing flowers in some not known from California, 3--5, 2--3 cm.
eFlora Treatment Author: Dale W. McNeal
Jepson Online Interchange
Previous taxon: Allium campanulatum
Next taxon: Allium cratericola
Citation for this treatment: Dale W. McNeal 2017. Allium cepa, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=12541, accessed on February 20, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on February 20, 2017.