CPC National Collection Plant Profile

Cercocarpus traskiae

Photographer:
Michael Wall

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CPC National Collection Plant Profile

Cercocarpus traskiae


Family: 
Rosaceae  
Common Names: 
Catalina mountain-mahogany, Santa Catalina Mountain-mahogany
Author: 
Eastw.
Growth Habit: 
Tree, Shrub
CPC Number: 
872

Distribution
Protection
Conservation
References


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Cercocarpus traskiaeenlarge
Photographer: Michael Wall
Image Owner: Rancho Santa Ana

Cercocarpus traskiaeenlarge
Photographer: Bart O'Brien
Image Owner: Personal


Cercocarpus traskiae is Partially Sponsored
Primary custodian for this plant in the CPC National Collection of Endangered Plants is: 

 
Cercocarpus traskiae


The Catalina Island mountain mahogany is considered to be one of the rarest shrubs in the continental United States. It has been rare as long as its existence has been known. This tree was first discovered in 1897 when there was a single population of forty individuals. Now there are only seven individuals remaining. The loss has been attributed to foraging by feral animals on the island. The Santa Catalina Conservancy has taken measures to protect the few remaining individuals, but there are still threats to their continued survival.

This evergreen shrub is a member of the rose family, producing flowers that lack petals from March to May.

Distribution & Occurrence

State Range
  California
State Range of  Cercocarpus traskiae
Habitat
  The slopes of a steep-sided, narrow, dry arroyo in a coastal sage scrub community with sausserite gabbro soils.

Distribution
  A single population in an arroyo on Santa Catalina Island.

Number Left
  This species lives in a single gully on California's Santa Catalina Island. Only seven adult trees remain. (CDFG 2002)

Protection

Global Rank:  
G1
 
10/6/2003
Guide to Global Ranks
Federal Status:  
LE
 
1/19/1996
Guide to Federal Status
Recovery Plan:  
No
 

State/Area Protection
  State/Area Rank Status Date  
  California S1.1 1  

Conservation, Ecology & Research

Ecological Relationships
  Unknown.

Threats
  Habitat disturbance
Hybridization with common relatives
Feral animals
(USFWS 1997)

Current Research Summary
  None known.

Current Management Summary
  The Santa Catalina Island Conservancy owns all of the habitat that this species occupies, and has been managing it since 1988, when they first fenced the remaining individuals to protect them from browsing animals. (CDFG 2002; USFWS 1997)

Research Management Needs
  Reintroduction efforts to suitable habitat on the island are necessary to ensure the stability of the species.
Genetic analysis to determine the threats to the species via inbreeding depression as well as hybridization with the common island mountain mahogany.

Ex Situ Needs
 

References

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.

Electronic Sources

CDFG. (2002). California's Plants and Animals, Threatened and Endangered Plants. List and Species Accounts. California Department of Fish and Game, Habitat Conservation Planning Branch. http://www.dfg.ca.gov/hcpb/species/t_e_spp/teplant/teplanta.shtml. Accessed: 2002.

Journal Articles

Blaney, C. 1995. Crossing the Lines to Extinction. BioScience. 45, 11: 744-745.

Rieseberg, L.H.; Gerber, D. 1995. Hybridization in the Catalina Island Mountain Mahogany (Cercocarpus traskiae)-RAPD Evidence. Conservation Biology. 9, 1: 199-203.

Rieseberg, L.H.; Zona, S.; Aberbom, L.; Martin, T.D. 1989. Hybridization in the island endemic Catalina mahogany. Conservation Biology. 3, 1: 52-58.

Thorne, R.F. 1967. A flora of Santa Catalina Island, California. Aliso. 6, 3: 1-77.

Umemoto, E. 1994. Catalina Island Mountain Mahogany and Alameda Manzanita--Endangered Species at the Garden. University of California Botanical Garden Newsletter. 19, 4

USFWS. 1995. Proposed rule to list three plants from the Channel Islands of southern California as endangered. Federal Register. 60, 142: 37987-37993.

USFWS. 1997. Determination of endangered status for three plants from the Channel Islands of southern California. Federal Register. 62, 153: 42692-42702.

Reports

Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized): Agriculture Handbook No. 541. Washington, D.C.: U.S. Forest Service. p.375.


  This profile was updated on 3/4/2010
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