Taxon Report

Astragalus lentiginosus Hook. var. antonius Barneby

San Antonio milk-vetch

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Taxon Summary

Astragalus lentiginosus var. antonius, commonly known as San Antonio milk-vetch, is a perennial herb in the Fabaceae that is found only in California. It occurs within Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 1500 to 2600 meters. Astragalus lentiginosus var. antonius is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Astragalus lentiginosus Hook. var. antonius Barneby
Common Name:	San Antonio milk-vetch
Family:	Fabaceae
Element Code:	PDFAB0FB92
USDA Plants Symbol:	ASLEA3
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Apr-Jul	Apr-Jul
Elevation:	1500-2600 (4920-8530)
General Habitats:	Lower montane coniferous forest, Upper montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G5T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG; SB_USDA; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	12
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	10

Location


California Endemic: True
California Counties and Islands: Name (Code)
Los Angeles (LAX), San Bernardino (SBD)
Quads: Name (Quad Code)
Mescal Creek (3411746), Mount San Antonio (3411736), Telegraph Peak (3411735), Valyermo (3411747)

Threat List Data from the CNDDB


Threat List Total:	5
EOs with Threat Listed:	Total EOs	% of EOs
	6	50 %
Recreational use (non-ORV)	4	33%
Road/trail construction/maint.	4	33%
Non-native plant impacts	2	16%
Channelization	1	8%
Development	1	8%

Notes



Threatened by development, illegal dumping, non-native plants, and road maintenance. See Leaflets of Western Botany 4(5):100 (1945) for original description, and Memoirs of the New York Botanical Garden 13:926-927 (1964) for taxonomic treatment.
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 30 November 2025].