CPC Plant Profile: San Gabriel Mountains Dudleya
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Plant Profile

San Gabriel Mountains Dudleya (Dudleya densiflora)

This shows the plant in situ. Photo Credit: Walter Wisura
Description
  • Global Rank: G2 - Imperiled
  • Legal Status: N/A
  • Family: Crassulaceae
  • State: CA
  • Nature Serve ID: 134347
  • Date Inducted in National Collection: 01/17/2019

Dudleya densiflora is a succulent perennial that is distinguished from other dudleyas by its thick, linear, terete leaves that are covered in a mealy powder. It is also distinguished from other more common dudleyas by its light-colored flowers, often white to pink. This plant has a narrow range and only occurs within three localities in the San Gabriel Mountains.

Participating Institutions
Updates
  • 09/01/2020
  • Orthodox Seed Banking

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.

  • 08/05/2020
  • Seed Collection

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

Nature Serve Biotics
  • 05/02/2017

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.

Valerie Soza
  • 01/01/2010

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

Valerie Soza
  • 01/01/2010

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.

Valerie Soza
  • 01/01/2010

None known.

Valerie Soza
  • 01/01/2010

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).

Valerie Soza
  • 01/01/2010

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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Photos
Nomenclature
Taxon Dudleya densiflora
Authority (Rose) Moran
Family Crassulaceae
CPC Number 1524
ITIS 502171
USDA DUDE2
Common Names San Gabriel Mountains dudleya | San Gabriel Mountains liveforever
Associated Scientific Names Dudleya densiflora | Stylophyllum nudicaule | Cotyledon densiflora | Cotyledon nudicaulis | Dudleya nudicaulis | Echeveria nudicaulis | Stylophyllum densiflorum
Distribution This taxon is a narrow endemic to the southern base of the San Gabriel Mountains in Los Angeles County, California, from Fish Canyon to San Gabriel Canyon.
State Rank
State State Rank
California S2
Habitat

Dudleya densiflora generally occurs on steep rocky granitic cliffs and canyon walls from 800 - 2000 feet in elevation.

Ecological Relationships

Needs study!

Pollinators
Common Name Name in Text Association Type Source InteractionID

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