The California Botanic Garden made a conservation seed collection from a population of Astragalus magdelenae var. peirsonii (Peirson’s milkvetch) located near Grays Well in the Algadones Dunes of Imperial County, California on April 6, 2021. This is a recollection of the 2003 seed collection made by J. Mark Porter (CalBG Accession #21036), and a seed sample was sent to the National Laboratory for Genetic Resources Preservation for use in the CPC/IMLS RNA Integrity Study. In 2021 California Botanic Garden also began a conservation genetics study of Peirson’s milkvetch funded by the Bureau of Land Management.
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.
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.
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
military exercises recreational activities off-road vehicles cattle grazing competition with alien plants urbanization stochastic extinction
currently known to occur along the north and west flanks of the Algodones Dunes extending into northeastern Baja, CA
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