California Native Plant Society
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Allium hyalinum
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Glassy Onion
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Allium hyalinum

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About Glassy Onion (Allium hyalinum) Allium hyalinum is a species of wild onion known by the common name glassy onion. It is endemic to California, where it is a common species of the San Joaquin Valley and the Sierra Nevada foothills. The glassy onion grows from a cluster of bulbs, with each bulb sending up a tall stem. Atop each stem is an flower cluster of up to 25, but usually fewer, white or pink-tinted white flowers. The flowers have six shiny petals which become transparent as they age.
Plant Description
Plant Type
Perennial herb

Flower Color
White, Pink

Flowering Season
Spring, Winter

Native Status

Natural Setting
Site Type
Grassy slopes, and rocky outcrops


Elevation ?
19' - 7839'

Annual Precip. ?
10.0" - 47.2"

Summer Precip. ?
0.16" - 1.46"

Coldest Month ?
37.9° F - 55.1° F

Hottest Month ?
56.3° F - 78.2° F

Humidity ?
1.67 vpd - 28.00 vpd

Sunset Zones ?
7*, 8*, 9*, 14*, 15*, 16*, 17, 18, 19, 20, 21, 22, 23, 24

Landscaping Information
Water Requirement ?
Very Low
Extremely Low
Very Low
Moderate - High

Common uses
Bee Gardens

Nursery Availability
Sometimes Available

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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