CPC Plant Profile: Thick-pod Milkvetch
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Plant Profile

Thick-pod Milkvetch (Astragalus pachypus var. jaegeri)

Photo Credit: © 2012 Keir Morse
  • Global Rank: T2 - Imperiled
  • Legal Status: N/A
  • Family: Fabaceae
  • State: CA
  • Nature Serve ID: 159737
  • Date Inducted in National Collection: 09/18/2021

A subspecies of the Thick pod milk-vetch, Jaeger’s milk-vetch is a perennial shrub that produces stalks of pale yellow blossoms seven months out of the year. Though historically known to inhabit San Diego County, Astragalus pachypus var. jaegeri is now endemic to the southwestern end of Riverside County. Within this region, there are about 20 known occurrences facing environmental threats including urbanization, road maintenance, and fire suppression. Known recurring sightings of A. p. var. jaegeri are along the roads that go through Cleveland National Forest.

Participating Institutions
  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 2 accessions of Astragalus pachypus var. jaegeri in orthodox seed collection. There are as many as 1540 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 1 seed accessions of Astragalus pachypus var. jaegeri from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 20 maternal plants

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Taxon Astragalus pachypus var. jaegeri
Authority Munz & McBurney
Family Fabaceae
CPC Number 44468
ITIS 192683
Common Names Jaeger's milk vetch | Jaeger's bush milk-vetch | Jaeger's milkvetch
Associated Scientific Names Astragalus pachypus var. jaegeri
Distribution A. pachypus var. jaegeri can be found in the southwest end of Riverside County and northeastern San Diego County. 
State Rank
State State Rank
California S2

A. p. var. jaegeri grows in foothill woodlands with chaparral growth, such as Cleveland National Forest. Other conditions for their ideal habitat would include sandy or rocky soil.

Ecological Relationships

Jaeger's milk vetch has beneficial ecological relations with multiple species of butterflies including Queen Alexandra's Sulphur (Colias alexandra), Reakirt's Blue (Hemiargus isola), Arrowhead Blue (Glaucopsyche piasus), and Marine Blue (Leptotes marina).

Common Name Name in Text Association Type Source InteractionID

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