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
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:
Lifeform: perennial bulbiferous herb
Blooming Period: Apr-Aug
JFMAMJJASOND
Elevation:
300 - 1320 meters
985 - 4330 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
  • Lower montane coniferous forest
Microhabitat Details:
Microhabitat:
  • Serpentine
  • Volcanic
Notes:
See Plant Life 28:63 (1972) for original description, and MadroƱo 36(2):122-130 (1989) for revised nomenclature.
Threats:
Taxonomy:
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%
Total Occurrences: 26
Element Occurrence Ranks:
A B C D X U
2 14 3 0 0 7
Occurrence Status:
Historical >20 Years 13
Recent <=20 Years 13
Presence:
Presumed Extant 26
Possibly Extirpated 0
Presumed Extirpated 0
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.
Presumed Extant
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