Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Trichostema ruygtii 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 Trichostema ruygtii from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants
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