CNPS

CNPS Rare Plant Inventory

Species Details

Allium jepsonii

Jepson's onion

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Photo of Allium jepsonii
© 2019 Steven Perry 		Photo of Allium jepsonii
© 2020 Belinda Lo 		Photo of Allium jepsonii
© 2019 Steven Perry

  Classification

Scientific Name:
Allium jepsonii (Traub) Denison & D. McNeal
Common Name:
Jepson's onion
Family: Alliaceae
Element Code: PMLIL022V0
USDA Plants Symbol: ALJE
Synonyms/Other Names:

  Conservation Status

CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G2
State Rank:
 S2
Other Status: BLM_S; SB_UCSC; USFS_S
CRPR Changes:
Add Date: 1994-01-01
Date Edited: 2022-12-06

  Ecology and Life History

Lifeform: perennial bulbiferous herb
Blooming Period: Apr-Aug
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Elevation:
300 - 1320 meters
985 - 4330 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
  • Lower montane coniferous forest
Microhabitat Details:
Microhabitat:
  • Serpentine
  • Volcanic

  Notes

Notes:
See Plant Life 28:63 (1972) for original description, and Madroño 36(2):122-130 (1989) for revised nomenclature.
Threats:
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 10
Total EOs % of EOs
EOs with Threat Listed: 18 69 %
THREAT LIST:
Road/trail construction/maint. 10 38%
Logging 9 34%
Other 3 11%
Recreational use (non-ORV) 2 7%
Non-native plant impacts 2 7%

  Occurrence Data from the CNDDB

Total Occurrences: 26
Element Occurrence Ranks:
A B C D X U
2 14 3 0 0 7
Occurrence Status:
Historical >20 Years 12
Recent <=20 Years 14
Presence:
Presumed Extant 26
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Butte (BUT), El Dorado (ELD), Placer (PLA), Tuolumne (TUO)
Quads: Name (Quad Code)
Auburn (3812181), Berry Creek (3912164), Cherokee (3912165), Paradise East (3912175), Pulga (3912174), Shingle Springs (3812068), Sonora (3712084), Stirling City (3912185)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

Suggested Citation:
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5). Website https://www.rareplants.cnps.org [accessed 25 April 2024].