Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Calyptridium arizonicum in orthodox seed collection. There are as many as 4321 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 Calyptridium arizonicum from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 51 maternal plants
Although more common outside of California, Calyptridium arizonicum is only known from a single canyon in California. This canyon is located in the North Pinyon Mountains within Anza-Borrego Desert State Park, and it contains an OHV route and a hiking trail. Calyptridium arizonicum is highly threatened in California due to trampling from OHV and foot traffic.
In 2019 Rancho Santa Ana Botanic Garden made a conservation seed collection of Calyptridium arizonicum from California Natural Diversity Database Element Occurrence #1. This collection contains 4,321 seeds collected along maternal lines from 51 individuals. The germination test resulted in 27% germination after treating the seeds with Cape Super Smoke Plus Seed Primer.
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