Three-bract Onion / Center For Plant Conservation
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Plant Profile

Three-bract Onion (Allium tribracteatum)

Kevin vouchers Allium tribracteatum and Lomatium stebbinsii - with Kevin Mason.

Photo Credit: Sean Carson
  • Global Rank: G2 - Imperiled
  • Legal Status: N/A
  • Family: Liliaceae
  • State: CA
  • Nature Serve ID: 134215
  • Lifeform: Forb/herb
  • Date Inducted in National Collection: 12/23/2021

Where is Three-bract Onion (Allium tribracteatum) located in the wild?


This species is a narrow endemic only occurring on thin volcanic soils composed of Andocite and Rhyolite, on ridge tops at high elevations. It is also reported that this species will grow on volcanic openings (pers. comm. Margaret Willits). (NatureServe 2022)


Found in Alpine, Amador, Calaveras, El Dorado, and Tuolumne Counties, California (CNPS 2017). (NatureServe 2022)

States & Provinces:

Three-bract Onion can be found in California

Which CPC Partners conserve Three-bract Onion (Allium tribracteatum)?

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

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Taxon Allium tribracteatum
Authority Torr.
Family Liliaceae
CPC Number 9243
ITIS 42654
Duration Perennial
Common Names Three-bract Onion
Associated Scientific Names Allium tribracteatum
Distribution Found in Alpine, Amador, Calaveras, El Dorado, and Tuolumne Counties, California (CNPS 2017). (NatureServe 2022)
State Rank
State State Rank
California S2
Ecological Relationships


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