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Astragalus oocarpus
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San Diego Milkvetch
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Astragalus oocarpus

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About San Diego Milkvetch (Astragalus oocarpus) Astragalus oocarpus is a rare species of milkvetch known by the common names San Diego milkvetch and Descanso milkvetch. It is endemic to southern California, where it is known only from the Peninsular Ranges of San Diego County. Its range may extend north into Riverside County. It is a plant of the chaparral slopes and woodlands of the mountains. Astragalus oocarpus is a perennial herb producing upright to erect hollow stems up to 1. 3 meters tall. Leaves are up to 17 centimeters long and are made up of veiny lance-shaped leaflets each up to 3 centimeters in length. The stem and leaves are mostly hairless. The inflorescence holds up to 75 cream-colored flowers, each between 1 and 2 centimeters in length. The fruit is an inflated legume pod 1. 5 to 2. 5 centimeters long which dries to a stiff papery texture.
Plant Description
Plant Type
Perennial herb

Max. Height
3.3 - 5 ft (1 - 1.5 m)

Flower Color

Native Status
Natural Setting
Elevation ?
31' - 7510'

Annual Precip. ?
10.7" - 29.0"

Summer Precip. ?
0.25" - 3.32"

Coldest Month ?
28.9° F - 54.1° F

Hottest Month ?
59.8° F - 80.3° F

Humidity ?
1.09 vpd - 27.42 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Descanso 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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