Based on an September 2020 extract of the California Plant Rescue Database, University of California-Santa Cruz Arboretum & Botanic Garden holds 1 accessions of Clarkia borealis subsp. borealis in orthodox seed collection. We are uncertain as to how many total seeds are in this collection.
Based on an August 2020 extract of the California Plant Rescue Database, California Native Plant Society has collected 1 seed accessions of Clarkia borealis subsp. borealis from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 50 maternal plants
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