Taxon Report

Astragalus webberi Gray

Webber's milk-vetch

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Taxon Summary

Astragalus webberi, commonly known as Webber's milk-vetch, is a perennial herb in the Fabaceae that is found only in California. It occurs within Broadleafed upland forest, Lower montane coniferous forest, and Meadows and seeps, growing at elevations from 731 to 1250 meters. Astragalus webberi is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Astragalus webberi Gray
Common Name:	Webber's milk-vetch
Family:	Fabaceae
Element Code:	PDFAB0F9J0
USDA Plants Symbol:	ASWE
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jul	May-Jul
Elevation:	731-1250 (2400-4100)
General Habitats:	Broadleafed upland forest, Lower montane coniferous forest, Meadows and seeps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	12
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	5
Fair (C)	3
Poor (D)	1
None (X)	1
Unknown (U)	2

Location


California Endemic: True
California Counties and Islands: Name (Code)
Plumas (PLU)
Quads: Name (Quad Code)
Caribou (4012112), Crescent Mills (4012018), Taylorsville (4012017), Twain (4012111)

Threat List Data from the CNDDB


Threat List Total:	9
EOs with Threat Listed:	Total EOs	% of EOs
	10	83 %
Road/trail construction/maint.	9	75%
Other	4	33%
Vandalism/dumping/litter	3	25%
ORV activity	2	16%
Wood cutting or brush clearing	1	8%
Recreational use (non-ORV)	1	8%
Logging	1	8%
Mining	1	8%
Non-native plant impacts	1	8%

Notes



Undocumented in SIE Co.; need quads. Threatened by illegal dumping, mining, non-native plants, road construction, road maintenance, and vehicles. See Botany of California 1:154 (1876) for original description.
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 5 February 2025].