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Astragalus tricarinatus
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Triple-ribbed Milkvetch
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Astragalus tricarinatus

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About Triple-ribbed Milkvetch (Astragalus tricarinatus) Astragalus tricarinatus is a rare species of milkvetch known by the common name triplerib milkvetch, or triple-ribbed milkvetch. It is endemic to California, where it can be found in the region where the San Bernardino Mountains meet the Mojave Desert and the Colorado Desert. It grows in desert scrub and expanses of rock litter amongst stands of Joshua trees. The plant is known from only one location and there were twenty individuals remaining there in 1998, when it was federally listed as an endangered species. This is a perennial herb growing in clumps up to about 25 centimeters tall. The leaves are up to 20 centimeters long and made up of several silvery-green hairy leaflets. The inflorescence holds 5 to 15 cream-colored flowers each about 2 centimeters in length. The fruit is a flat legume pod up to about 4 centimeters long. The pod is curved and has three distinct ribs.
Plant Description
Plant Type
Perennial herb

Max. Height
1.9 - 9.8 in (4.8 - 24.9 cm)

Flower Color

Native Status
Natural Setting
Elevation ?
594' - 8672'

Annual Precip. ?
4.0" - 15.2"

Summer Precip. ?
0.58" - 1.98"

Coldest Month ?
31.5° F - 57.6° F

Hottest Month ?
55.8° F - 86.9° F

Humidity ?
2.91 vpd - 38.60 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Triplerib Milkvetch

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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