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Astragalus agrestis (Purple milkvetch)
Smith, R.W.

Astragalus agrestis

Astragalus agrestis Douglas ex G. Don

Purple Milkvetch, Field Milk-vetch

Fabaceae (Pea Family)

Synonym(s): Astragalus danicus var. dasyglottis, Astragalus dasyglottis, Astragalus goniatus, Astragalus hypoglottis

USDA Symbol: ASAG2

USDA Native Status: L48 (N), CAN (N)

A soft green plant tending to grow in patches, with weak stems often leaning on other vegetation, and pink to lavender or purple pea flowers crowded in short heads.

This plant is representative of many of the low Astragalus with purplish or pink flowers; the hundreds of species in the West are difficult to identify. Poisonous species of Astragalus and Oxytropis are known as locoweeds. This species also occurs in Asia


From the Image Gallery

3 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Leaf Arrangement: Alternate
Fruit Type: Legume
Leaf: Green

Bloom Information

Bloom Color: Purple
Bloom Time: May , Jun , Jul , Aug


USA: CA , CO , IA , ID , IL , KS , MN , MT , ND , NE , NM , NV , OR , SD , UT , WA , WY
Canada: BC , SK
Native Distribution: Across much of Canada and south to northeastern California, southern Utah, central New Mexico, Kansas, and Iowa.
Native Habitat: Commonly in moist meadows and prairies and on cool brushy slopes.

Growing Conditions

Water Use: Low
Light Requirement: Sun
CaCO3 Tolerance: Low


Warning: Although this species has not been reported as poisonous, all plants in the genus Astragalus are potentially toxic to humans and animals if ingested, causing a disorder called locoism. The milk from an animal that has ingested Astragalus plants may also b
Conspicuous Flowers: yes

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Additional resources

USDA: Find Astragalus agrestis in USDA Plants
FNA: Find Astragalus agrestis in the Flora of North America (if available)
Google: Search Google for Astragalus agrestis


Record Modified: 2015-03-16
Research By: TWC Staff

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