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Astragalus agrestis
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Field Milkvetch
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Astragalus agrestis
  

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About Field Milkvetch (Astragalus agrestis) Astragalus agrestis is a species of milkvetch known by the common names purple milkvetch, purple loco, and field milkvetch. It is native to much of western and northern North America from most of Canada to the southwestern United States, as well as eastern Asia. It grows in vernally moist areas such as meadows, and is often found in sagebrush. This is a perennial herb growing a slender but sturdy stem from an underground caudex. It leans or grows upright to a maximum height near 30 centimeters. The stem is often roughly hairy. Alternately arranged leaves are up to 10 centimeters long and made up of several pairs of leaflets up to 2 centimeters long each. They are oval to lance-shaped and may have notched tips. The inflorescence is an oval-shaped cluster of up to 15 purple or pink-tinted to nearly white pealike flowers. Each flower is up to 2 centimeters long. This is a perennial herb growing a slender but sturdy stem from an underground caudex. It leans or grows upright to a maximum height near 30 centimeters. The stem is often roughly hairy. Alternately arranged leaves are up to 10 centimeters long and made up of several pairs of leaflets up to 2 centimeters long each. They are oval to lance-shaped and may have notched tips. The inflorescence is an oval-shaped cluster of up to 15 purple or pink-tinted to nearly white pealike flowers. Each flower is up to 2 centimeters long. The fruit is an oval-shaped legume pod up to a centimeter long. It is dark colored with white hairs and dries to a papery texture.
Plant Description
Plant Type
Perennial herb

Max. Height
0.3 - 1 ft (0.09 - 0.3 m)

Form
Mounding

Growth Rate
Moderate

Flower Color
Purple, Lavender, Blue, Pink, White

Flowering Season
Summer
Spring
Summer
Fall
Winter


Native Status
Natural Setting
Elevation ?
5319' - 7649'

Annual Precip. ?
10.3" - 20.4"

Summer Precip. ?
1.05" - 1.60"

Coldest Month ?
29.0° F - 30.8° F

Hottest Month ?
56.2° F - 60.3° F

Humidity ?
1.10 vpd - 16.62 vpd

Soil Description
Prefers loamy soils

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Purple Milkvetch, Purple Loco


Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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