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Twin Leaved Onion Back to Plant Page
Allium anceps

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About Twin Leaved Onion (Allium anceps) Allium anceps, known by the common names twinleaf onion and Kellogg's onion, is an onion that is native to the Great Basin of North America. It is widespread in Nevada and adjacent portions of California, Idaho and Oregon. It grows in relatively small and isolated areas, but growth is typically dense, often to the exclusion of all other vegetation. It has two flat and narrow leaves which first appear in late winter, and grow up to 10 centimeter in length. It has a pink or purple flower head which grows on a separate stalk starting in mid-spring. By early summer the above-ground portions of the plant die, and there is little evidence of the plant's existence throughout much of the year. The bulb is white with a yellow or brown husk, and approximately 1 centimeter in diameter. It is edible, although it has a strong oniony taste.
Plant Description
Plant Type
Perennial herb

Flower Color
Pink, Purple

Native Status

Natural Setting
Site Type
Clay or rocky slopes


Elevation ?
4288' - 7643'

Annual Precip. ?
7.8" - 88.9"

Summer Precip. ?
0.55" - 2.08"

Coldest Month ?
29.3° F - 36.4° F

Hottest Month ?
55.6° F - 65.3° F

Humidity ?
1.17 vpd - 20.42 vpd


Landscaping Information
Common uses
Bee Gardens

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Twinleaf Onion, Kellogg's 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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