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Humboldt County Milkvetch Back to Plant Page
Astragalus agnicidus

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About Humboldt County Milkvetch (Astragalus agnicidus) Astragalus agnicidus is a rare species of milkvetch known by the common name Humboldt County milkvetch. It is endemic to northern California, where it is known only from two populations in Humboldt County and one in Mendocino County. The plant was undescribed until the 1950s. Until then it was known only from one 8-acre (32,000 m2) ranch in Humboldt County, where sheep ranchers blamed the unnamed species for the deaths of their animals, which may have eaten it. They eradicated the plant from their land, and by the time it was formally described and named in 1957 it was thought to be extinct. The species name given the plant, agnicidus, means "lamb-killer".
Plant Description
Plant Type
Perennial herb

Max. Height
1 - 3 ft (0.3 - 0.9 m)

Flower Color

Native Status
Natural Setting
Elevation ?
250' - 2427'

Annual Precip. ?
46.6" - 82.5"

Summer Precip. ?
0.79" - 1.69"

Coldest Month ?
43.0° F - 45.7° F

Hottest Month ?
63.5° F - 70.1° F

Humidity ?
0.03 vpd - 18.00 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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