Taxon Report

Astragalus pseudiodanthus Barneby

Tonopah milk-vetch

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Taxon Summary

Astragalus pseudiodanthus, commonly known as Tonopah milk-vetch, is a perennial herb in the Fabaceae that is found in California and elsewhere. It occurs within Great Basin scrub, growing at elevations from 2025 to 2075 meters. Astragalus pseudiodanthus is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Astragalus pseudiodanthus Barneby
Common Name:	Tonopah milk-vetch
Family:	Fabaceae
Element Code:	PDFAB0F750
USDA Plants Symbol:	ASPS
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jun	May-Jun
Elevation:	2025-2075 (6645-6810)
General Habitats:	Great Basin scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2Q
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG; SB_SBBG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	8
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	8

Location


California Endemic: False
California Counties and Islands: Name (Code)
Mono (MNO)
Quads: Name (Quad Code)
Alameda Well (3811817), Cedar Hill (3811827), Kirkwood Spring (3811828)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	7	88 %
Grazing	7	87%
Road/trail construction/maint.	1	12%

Notes



Known in CA from fewer than ten occurrences. Threatened by grazing. See Leaflets of Western Botany 3:99 (1942) for original description, and Systematic Botany 8:422 (1983) for alternate taxonomic treatment as A. iodanthus var. pseudiodanthus.
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 31 October 2025].