Taxon Details

Astragalus rattanii var. jepsonianus

Jepson's milk-vetch

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Taxon Summary:

Astragalus rattanii var. jepsonianus, commonly known as Jepson's milk-vetch, is a annual herb in the Fabaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Valley and foothill grassland, growing at elevations from 295 to 700 meters. Astragalus rattanii var. jepsonianus is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Astragalus rattanii Gray var. jepsonianus Barneby
Common Name: Jepson's milk-vetch
Family:	Fabaceae
Element Code:	PDFAB0F7E1
USDA Plants Symbol:	ASRAJ
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G4T3
State Rank:	S3
Other Status:	BLM_S; SB_UCSC
CRPR Changes:
Add Date:	1988-01-01
Date Edited:	2023-05-02

Ecology and Life History

Lifeform: annual herb

Blooming Period: Mar-Jun

Elevation:
295 - 700 meters
970 - 2295 feet

General Habitats:

Chaparral
Cismontane woodland
Valley and foothill grassland

Microhabitat Details:

Microhabitat:

Serpentine (often)

Notes

Notes: Most occurrences small and widely scattered.
Threats: Possibly threatened by road maintenance, vehicles, renewable energy development, and non-native plants.
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	8
	Total EOs	% of EOs
EOs with Threat Listed:	14	26 %
Non-native plant impacts	7	12%
Road/trail construction/maint.	7	12%
Foot traffic/trampling	3	5%
ORV activity	3	5%
Development	2	3%
Erosion/runoff	2	3%
Recreational use (non-ORV)	1	1%
Vandalism/dumping/litter	1	1%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					54
A	B	C	D	X	U
9	14	4	1	0	26

Occurrence Status:
Historical >20 Years	21
Recent <=20 Years	33

Presence:
Presumed Extant	54
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Colusa (COL), Glenn (GLE), Lake (LAK), Napa (NAP), San Benito (SBT), Sonoma (SON), Tehama (TEH), Yolo (YOL)

Quads: Name (Quad Code)
Chrome (3912265), Cold Fork (4012226), Detert Reservoir (3812265), Gilmore Peak (3912235), Glascock Mtn. (3812283), Hall Ridge (3912276), Hough Springs (3912225), Idria (3612046), Jericho Valley (3812274), Knoxville (3812273), Leesville (3912224), Lower Lake (3812285), Lowrey (4012215), Middletown (3812275), Mount St. Helena (3812266), Newville (3912275), Paskenta (3912285), Salt Canyon (3912213), St. John Mtn. (3912246), Stonyford (3912245), Walter Springs (3812263), Whispering Pines (3812276), Wilbur Springs (3912214), Wilson Valley (3812284)

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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Original Description:	Aliso 4:137 (1958)
Taxonomic Treatment:	Memoirs of the New York Botanical Garden 13:1052 (1964)
Species Account:	Astragalus rattanii var. jepsonianus profile for potential Species of Conservation Concern evaluation (2018)
Other:	Systematic Botany 17(3):367-379 (1992) for distributional information

CNPS Rare Plant Inventory