CPC Plant Profile: Three-bract Onion
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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
  • Date Inducted in National Collection: 12/23/2021

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Taxon Allium tribracteatum
Authority Torr.
Family Liliaceae
CPC Number 9243
ITIS 42654
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

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)

Ecological Relationships

Common Name Name in Text Association Type Source InteractionID
Lead Institution State Reintroduction Type Year of First Outplanting

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