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Allium campanulatum
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Sierra Onion
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Allium campanulatum

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About Sierra Onion (Allium campanulatum) Allium campanulatum is a species of wild onion known by the common name dusky onion. This is a flowering plant native to the western United States from Washington to California as well as Nevada. The dusky onion grows from a gray-brown bulb one to two centimeters wide which may extend tiny rhizomes and produce small daughter bulblets. It rises on a stout stem and has usually two long, drooping onion leaves. Atop the stem is an flower cluster of 10 to 50 flowers. Each flower is half a centimeter to one centimeter wide and is pink, purple, or less often white, and each tepal has a dark-colored base. The petals are variable in shape, from narrow and very pointy to spade-shaped. The dusky onion grows in low mountains, especially in dry areas.
Plant Description
Plant Type
Perennial herb

Flower Color
Pink, White, Purple

Flowering Season

Native Status

Natural Setting
Site Type
Dry slopes


Elevation ?
25' - 11310'

Annual Precip. ?
8.4" - 123.8"

Summer Precip. ?
0.18" - 4.20"

Coldest Month ?
22.6° F - 52.0° F

Hottest Month ?
45.5° F - 80.5° F

Humidity ?
0.47 vpd - 28.68 vpd

Sunset Zones ?
1, 2, 3, 7, 8, 9, 14, 15, 16, 17, 18

Landscaping Information
Common uses
Bee Gardens

Nursery Availability
Rarely Available

Other Names
Common Names
Dusky Onion

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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