CPC Plant Profile: Peirson\\\'s Milkvetch
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Plant Profile

Peirson\\\'s Milkvetch (Astragalus magdalenae var. peirsonii)

Photo Credit: © 2008 Jordan Zylstra
Description
  • Global Rank: N/A
  • Legal Status: N/A
  • Family: Fabaceae
  • State: CA
  • Nature Serve ID: 155182
  • Date Inducted in National Collection: 06/25/2021

Endemic to the open dunes and deserts of southeastern California, Astragalus magdalenae var. peirsonii is an endangered, perennial herb that suffers from off-road vehicular activity, habitat fragmentation, and seed predation. Throughout the springtime, Peirson’s milk vetch can be found producing purple flowers with white tips that grow in clusters of 10-15/stem. From a singular woody stem, A. m. var. peirsonii branches out like a broom-shaped scrub that reaches 1-2 ft tall.

Participating Institutions
Updates
Katie Heineman
  • 06/25/2021
  • Propagation Research

In 2021, California Botanic Garden recollected seed from a population of Astragalus magdalenae var. perisonii originally collected in 2003 as part of CPC's IMLS-funded seed longevity project that will evaluate how the germination rates and RNA integrity of this species endures in long term orthodox seed storage.   

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 12 accessions of Astragalus magdalenae var. peirsonii in orthodox seed collection. There are as many as 12018 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 11 seed accessions of Astragalus magdalenae var. peirsonii from 2 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 313 maternal plants

  • 01/01/2010

military exercises recreational activities off-road vehicles cattle grazing competition with alien plants urbanization stochastic extinction

  • 01/01/2010

currently known to occur along the north and west flanks of the Algodones Dunes extending into northeastern Baja, CA

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Photos
Nomenclature
Taxon Astragalus magdalenae var. peirsonii
Authority (Munz & McBurney) Barneby
Family Fabaceae
CPC Number 440
ITIS 192607
USDA ASMAP
Common Names Peirson's Milk-vetch | Peirson's locoweed | Peirson's milkvetch
Associated Scientific Names Astragalus magdalenae var. peirsonii | Astragalus peirsonii
Distribution Endemic to the open dunes and deserts of southeastern California, Astragalus magdalenae var. peirsonii is an endangered, perennial herb that suffers from off-road vehicular activity, habitat fragmentation, and seed predation. Throughout the springtime, Peirson’s milk vetch can be found producing purple flowers with white tips that grow in clusters of 10-15/stem. From a singular woody stem, A. m. var. peirsonii branches out like a broom-shaped scrub that reaches 1-2 ft tall. 
State Rank
State State Rank
California S2
Habitat

grows on sand dunes within creosote bush scrub

Ecological Relationships

This variation of milk vetch gets visited frequently by pollinating butterflies from the Lycaenidae family such as Arrowhead Blue (Glaucopsyche piasus) and Reakirt\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s Blue (Hemiargus isola) 

Pollinators
Common Name Name in Text Association Type Source InteractionID
Butterflies & Moths
Blues Glaucopsyche piasus Floral Visitor Link

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