CPC National Collection Plant Profile

Dudleya densiflora

Photographer:
Walter Wisura

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CPC National Collection Plant Profile

Dudleya densiflora


Family: 
Crassulaceae  
Common Name: 
San Gabriel Mountains dudleya
Author: 
(Rose) Moran
Growth Habit: 
Forb/herb
CPC Number: 
1524

Distribution
Protection
Conservation
References


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Dudleya densifloraenlarge
Photographer: Walter Wisura
Image Owner: Rancho Santa Ana

Dudleya densifloraenlarge
Photographer: Valerie Soza
Image Owner: Rancho Santa Ana


Dudleya densiflora is Not Sponsored
Primary custodian for this plant in the CPC National Collection of Endangered Plants is: 
Valerie Soza contributed to this Plant Profile.

 
Dudleya densiflora


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.

Distribution & Occurrence

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

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.

Number Left
  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.

Protection

Global Rank:  
G1
 
10/25/2005
Guide to Global Ranks
Federal Status:  
RT
 
1/19/1996
Guide to Federal Status
Recovery Plan:  
No
 

State/Area Protection
  State/Area Rank Status Date  
  California S1.2 5  

Conservation, Ecology & Research

Ecological Relationships
  Needs study!

Threats
  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 afforded some protection. Both existing populations in Fish and Roberts Canyon are currently on Forest lands. However, a new housing development is under construction near the mouth of Roberts Canyon and may impact the population there with increased future anthropogenic activity. The population in San Gabriel Canyon is on private property belonging to Los Angeles Department of Public Works and inaccessible to the public. Historical occurrences of Dudleya densiflora previously reported lower down in the mouths of Fish and San Gabriel canyons are believed to have been eliminated by development and rock quarrying (Mistretta and Brown 1989).

Current Research Summary
  None known.

Current Management Summary
  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 Management Needs
  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).

Ex Situ Needs
 

References

Books (Single Authors)

Allan, G.J.; Mistretta, O.; Tommerup, M.; Blassey, K.; Brown, W.J., Jr. 1995. A field guide to the rare plants of the Angeles National Forest. USDA Forest Service, Pacific Southwest Region, Angeles National Forest, in cooperation with Rancho Santa Ana Botanic Garden. 153p.

Skinner, M.W.; Pavlik, B.M. 1997. Inventory of rare and endangered vascular plants of California: Electronic Inventory Update of 1994, 5th edition. Sacramento: California Native Plant Society.

Books (Sections)

Kartesz, J.T. 1999. A synonymized checklist of the vascular flora of the U.S., Canada, and Greenland. In: Kartesz, J.T.; Meacham, C.A., editors. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden. Chapel Hill, NC.

Books (Edited Volumes)

James C. Hickman, Editor. 1993 The Jepson manual: Higher plants of California. Berkeley: University of California Press. 1400p.

Journal Articles

USFWS. 1997. Notice of reclassification of ten candidate taxa. Federal Register. 62, 182: 49191-49193.

Reports

Mistretta, O.; Brown, W.J., Jr. 1989. Species Management Guide for Dudleya densiflora (Rose) Moran, Technical Report No. 5. Claremont: USDA Forest Service, Pacific Southwest Region, Angeles National Forest and Rancho Santa Ana Botanic Garden. p.21.

Soza, Valerie; Boyd, Steve. 2000. Dudleya densiflora monitoring data for 2000 and monitoring program five-year summary report on the Angeles National Forest. Arcadia, CA: Submitted to William J. Brown, Jr., USDA Forest Service, Angeles National Forest. p.24.

Soza, Valerie; Boyd, Steve. 2001. Monitoring program report and 2001 data for Dudleya densiflora on the Angeles National Forest. Arcadia, CA: Submitted to William J. Brown, Jr., USDA Forest Service, Angeles National Forest. p.29.


  This profile was updated on 3/4/2010
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