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Astragalus obscurus
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Arcane Milkvetch
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Astragalus obscurus

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About Arcane Milkvetch (Astragalus obscurus) Astragalus obscurus is a species of milkvetch known by the common name arcane milkvetch. It is native to the northwestern United States of Idaho and Oregon and northern parts of Nevada and California. It is a plant of rocky areas in mountains and Great Basin plateaus. This is a small, mat-forming perennial herb with tufts of hairy stems approaching a maximum length of 15 centimeters. The leaves are up to 10 centimeters long and made up of thick oval-shaped leaflets. The inflorescence is a dense cluster of 5 to 15 off-white to faintly lilac-tinted flowers, each less than a centimeter long. The fruit is a narrow, leathery legume pod held upright in the infructescence. It may reach 2. 5 centimeters in length and usually has two chambers inside.
Plant Description
Plant Type
Perennial herb

Max. Height
5.9 in (15 cm)

Flower Color

Native Status

Natural Setting
Elevation ?
4743' - 6964'

Annual Precip. ?
12.0" - 20.8"

Summer Precip. ?
1.06" - 2.16"

Coldest Month ?
26.6° F - 34.8° F

Hottest Month ?
57.5° F - 60.8° F

Humidity ?
0.67 vpd - 16.35 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

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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