Taxon Report

Astragalus breweri Gray

Brewer's milk-vetch

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Taxon Summary

Astragalus breweri, commonly known as Brewer's milk-vetch, is a annual herb in the Fabaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Meadows and seeps, Valley and foothill grassland (openings, and often gravelly), growing at elevations from 90 to 730 meters. Astragalus breweri is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Astragalus breweri Gray
Common Name:	Brewer's milk-vetch
Family:	Fabaceae
Element Code:	PDFAB0F1J0
USDA Plants Symbol:	ASBR8
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Apr-Jun	Apr-Jun
Elevation:	90-730 (295-2395)
General Habitats:	Chaparral, Cismontane woodland, Meadows and seeps, Valley and foothill grassland
Microhabitat:	Serpentine (often), Volcanic
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	0
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Colusa (COL), Lake (LAK), Marin (MRN), Mendocino (MEN), Napa (NAP), Sonoma (SON)
Quads: Name (Quad Code)
Aetna Springs (3812264), Bolinas (3712286), Calistoga (3812255), Chiles Valley (3812253), Highland Springs (3812288), Jericho Valley (3812274), Jimtown (3812267), Kelseyville (3812287), Lakeport (3912218), Leesville (3912224), Middletown (3812275), Potter Valley (3912331), San Rafael (3712285), St. Helena (3812254), The Geysers (3812277), Upper Lake (3912228), Walter Springs (3812263), Whispering Pines (3812276), Wilbur Springs (3912214), Yorkville (3812382)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Populations have been lost to development and road construction. Threatened by development and non-native plants. See Systematic Botany 17(3):367-379 (1992) for distributional information.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 1 February 2025].