Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 3 accessions of Oenothera californica subsp. eurekensis in orthodox seed collection. There are as many as 62683 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 3 seed accessions of Oenothera californica subsp. eurekensis from 2 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 113 maternal plants
Endemic to California, Oenothera californica ssp. eurekensis is known only from the Eureka Dunes in Inyo County. Known from fewer than five occurrences, the populations are recovering well following the ban of recreational vehicles on the dunes. However, the delicate primrose is still threatened by vehicle trespass.
Habitat destruction and four-wheel driving.
There are fewer than five occurrences found in the Eureka Dune system.
Pavlik and Barbour's 1988 work on seed production, survivorship, seed bank and seed establishment showed that the endemic populations of Swallenia, Oenothera and Astragalus at the dunes are not declining. Although the plant populations appear to be stable, further study is warranted on the pollinator populations.
The primary objective of the Eureka Valley Dunes Recovery Plan is to protect the existing dunegrass and associated species from human threats. There is no plan for transplantation or other methods of propagation to support existing populations (USFWS 1983). The plan does however, call for adequate monitoring of remaining populations.
Population monitoring and general ecology of Oenothera californica would be helpful for conservation efforts.
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