Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 2 accessions of Tropidocarpum capparideum in orthodox seed collection. There are as many as 1294 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 Tropidocarpum capparideum from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 5 maternal plants
Known only from the vicinity of Mount Diablo in California. This species was missing from 1957 until 2003 when it was rediscovered.
Extinct in California...but Wilken reports on population in 2001 proposal!
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