Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 22 accessions of Erysimum capitatum var. angustatum in orthodox seed collection. There are as many as 350713 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 1 seed accessions of Erysimum capitatum var. angustatum from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 8 maternal plants
Endemic to the Antioch Dunes in Contra Costa County, California, Erysimum capitatum var. angustatum is known from only three occurrences. Recovery work is in progress and is sorely needed: over 90% of the dune habitat has been destroyed over the last thirty years. The plant is seriously threatened by mining, conversion of land to agriculture, non-native plant competition, and industrial development.
Off-road vehicles (ORV's)
Habitat destruction via development
Potential sale of large portions of the protected Reserve as of 1996
(Skinner & Pavlik 1997)
Two sites in the Antioch Dunes along the San Joaquin River east of Antioch, Contra Costa County. In 1977, only 28 individuals were known to exist (USFWS 1978c)
Pavlik (1993) determined that Erysimum capitatum ssp. angustatum had an adequate seed bank to buffer it against stochastic events and the erosion of genetic diversity.
Protected by the Antioch Dunes National Wildlife Refuge.
According to Steve Edwards at Regional Parks Botanical Garden, the USFWS is putting together an extensive management plan and program.
Restoration and continued protection of the Antioch Dune system for the protection of this species and the protection of the many other threatened and endangered organisms that are endemic to this habitat. (NatureServe 2001)
Maintain a genetically representative seed bank.
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