Howell's Onion / Center For Plant Conservation
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Plant Profile

Howell's Onion (Allium howellii var. sanbenitense)

  • Global Rank: T3 - Vulnerable
  • Legal Status: N/A
  • Family: Liliaceae
  • State: CA
  • Nature Serve ID: 153790
  • Lifeform: Forb/herb
  • Date Inducted in National Collection: 12/23/2021

Where is Howell's Onion (Allium howellii var. sanbenitense) located in the wild?


Allium howellii var. sanbenitense is endemic to California and found in the inner central Coast Range which intersects Fresno, Monterey, and San Benito Counties. There are around 18 occurrences. Of the twelve recently documented occurrences, most are on BLM land and aerial imagery reveals that they are remote and undisturbed. Several occurrences have threats but the severity of those threats is not known. (NatureServe 2022) This taxon occurs in grassy openings chaparral with vertic or heavy clay soils (Jepson Flora Project 2020, FNA 2002a) (NatureServe 2022).

States & Provinces:

Howell's Onion can be found in California

Which CPC Partners conserve Howell's Onion (Allium howellii var. sanbenitense)?

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 howellii var. sanbenitense
Authority (Traub) Ownbey & Aase
Family Liliaceae
CPC Number 46711
ITIS 526874
Duration Perennial
Common Names San Benito onion
Associated Scientific Names Allium howellii ssp. sanbenitense | Allium sanbenitense
State Rank
State State Rank
California S2
Ecological Relationships


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