Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Opuntia basilaris var. treleasei in orthodox seed collection. There are as many as 412 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 Opuntia basilaris var. treleasei from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 23 maternal plants
Historically, this taxon occurred in populations that were more or less continuous east of Bakersfield, California. It is now restricted to a limited area of central Kern County near the Southern San Joaquin Valley. About one-third of the historical occurrences have been extirpated due to the conversion of habitat into agriculture and urban development. The remaining populations are small and highly fragmented, concentrated into about 11 areas. Only four core areas contain populations of greater than 1,000 clumps. Remaining populations are threatened by loss of habitat from agricultural, urbanizing, mining and energy developments, off-road vehicle traffic, trash dumping, grazing, and competition with non-native invasive species.
Habitat loss due to development
Sand and gravel mining
Off-road vehicle (ORVs)
Low genetic diversity
(Brown and Cypher 1997)
Overgrazing by sheep and cattle (HCPB 2002)
There are eleven sites supporting less than 20,000 clusters and only four sites contain populations of more than 1,000 clusters (Brown and Cypher 1997; USFWS 1998)
In 1997, three areas of Bakersfield cactus habitat were acquired as mitigation and are currently being managed to protect this rare variety. (CDFG 2002)
In 1998, a regional recovery plan was drafted and included protection of this cactus. (USFWS 1998)
Basic natural history and reproductive biology
Maintain genetically representative seed bank.
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