Species Details

Astragalus tener var. ferrisiae

Ferris' milk-vetch

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Classification

Scientific Name: Astragalus tener Gray var. ferrisiae Liston
Common Name: Ferris' milk-vetch
Family:	Fabaceae
Element Code:	PDFAB0F8R3
USDA Plants Symbol:	ASTEF
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	None
State List:	None
Global Rank:	G2T1
State Rank:	S1
Other Status:
CRPR Changes:
Add Date:	1994-01-01
Date Edited:	2024-01-02

Ecology and Life History

Lifeform: annual herb

Blooming Period: Apr-May

Elevation:
2 - 75 meters
5 - 245 feet

General Habitats:

Meadows and seeps (vernally mesic)
Valley and foothill grassland (subalkaline flats)

Microhabitat Details:

Microhabitat:

Notes

Notes: Rediscovered in 1989 by V. Oswald in Butte Sink WA (DFG). Most historical habitat destroyed by agriculture. See Brittonia 42(2):100-104 (1990) for original description, and Systematic Botany 17(3):367-379 (1992) for distributional information.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	5
	Total EOs	% of EOs
EOs with Threat Listed:	8	44 %
Agriculture	6	33%
Grazing	2	11%
Non-native plant impacts	1	5%
Other	1	5%
Surface water diversion	1	5%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					18
A	B	C	D	X	U
1	0	0	1	5	11

Occurrence Status:
Historical >20 Years	17
Recent <=20 Years	1

Presence:
Presumed Extant	13
Possibly Extirpated	5
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Butte (BUT), Colusa (COL), Glenn (GLE), Solano (SOL)*, Sutter (SUT), Yolo (YOL), Yuba (YUB)

Quads: Name (Quad Code)
Arbuckle (3912211)*, Butte City (3912148), Colusa (3912221)*, Davis (3812156), Dozier (3812137)*, Dunnigan (3812188)*, Grimes (3912118), Llano Seco (3912158), Logandale (3912242), Manor Slough (3912223), Merritt (3812157), Nord (3912178)*, Olivehurst (3912115), Pennington (3912137), Sacramento West (3812155), Saxon (3812146), Sutter (3912126), West of Biggs (3912147), Wildwood School (3812281), Yuba City (3912125)*

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