Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 6 accessions of Dudleya densiflora in orthodox seed collection. There are as many as 418137 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 6 seed accessions of Dudleya densiflora from 5 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants
Endemic to San Gabriel Mountains of Los Angeles County, California. About 5 populations are known to be extant. A few historic populations have been destroyed by mining. Collecting and recreational use are ongoing threats. Formal protection is needed for all known sites.
Current threats include quarrying at the mouth of the canyon and a recreational hiking and fishing trail through Fish Canyon. However, Dudleya densiflora generally occurs on steep, rugged, inaccessible areas well above recreational activity and is afford
Only 3 populations: Fish Canyon, Roberts Canyon, and San Gabriel Canyon. A total of approximately 1700 individuals, comprised of 750 in Fish Canyon, 700 in Roberts Canyon, and 250 in San Gabriel Canyon.
A species management guide has been developed for this taxon on the Angeles National Forest. A monitoring program has also been developed to gain knowledge into the life history, etc. of Dudleya densiflora, in which individuals will be mapped and tracked over 10 years at two localities on the Angeles National Forest (Soza and Boyd 2001).
Research is needed into the life history and reproductive biology of Dudleya densiflora, including recruitment frequency (which appears to be low), average life span, and time to reproductive maturity (Soza and Boyd 2000). An annual monitoring program of 10 years minimum is needed to track individuals and has been initiated in 2001 in conjunction with the Forest Service and RSABG (Soza and Boyd 2001).
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