Species Details

Allium jepsonii

Jepson's onion

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Species Description:

Allium jepsonii, commonly known as Jepson's onion, is a perennial bulbiferous herb in the Alliaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Lower montane coniferous forest, growing at elevations from 300 to 1320 meters. Allium jepsonii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

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:
Name Status:	JEP, FNA, POWO, IPNI, Tropicos

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

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:
Threat List Total:	10
	Total EOs	% of EOs
EOs with Threat Listed:	18	69 %
Road/trail construction/maint.	10	38%
Logging	9	34%
Other	3	11%
Recreational use (non-ORV)	2	7%
Non-native plant impacts	2	7%
Erosion/runoff	2	7%
Grazing	2	7%
Mining	1	3%
Development	1	3%
Vandalism/dumping/litter	1	3%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					26
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

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

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CNPS Rare Plant Inventory