Taxon Report

Astragalus iodanthus Wats. var. diaphanoides Barneby

snake milk-vetch

Print Report

Taxon Summary

Astragalus iodanthus var. diaphanoides, commonly known as snake milk-vetch, is a perennial herb in the Fabaceae that is found in California and elsewhere. It occurs within Chenopod scrub, Great Basin scrub (clay, and sandy), growing at elevations from 1200 to 1405 meters. Astragalus iodanthus var. diaphanoides is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Astragalus iodanthus Wats. var. diaphanoides Barneby
Common Name:	snake milk-vetch
Family:	Fabaceae
Element Code:	PDFAB0F4C3
USDA Plants Symbol:	ASIOD
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Apr-Jun	Apr-Jun
Elevation:	1200-1405 (3935-4610)
General Habitats:	Chenopod scrub, Great Basin scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G4T4
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
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: False
California Counties and Islands: Name (Code)
Lassen (LAS), Modoc (MOD)
Quads: Name (Quad Code)
Calneva Lake (4012021), Five Springs (4012052), Infernal Caverns (4112035), Karlo (4012053), Little Mud Flat (4012042), Shaffer Mtn. (4012043), Wendel (4012032)

Threat List Data from the CNDDB


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

Notes



Not in The Jepson Manual. See Leaflets of Western Botany 4(4):50 (1944) 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 14 November 2025].