CPC National Collection Plant Profile

Malacothamnus clementinus

Photographer:
Dylan Hannon

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CPC National Collection Plant Profile

Malacothamnus clementinus


Family: 
Malvaceae  
Common Name: 
San Clemente Island bush-mallow
Author: 
(Munz & Johnston) Kearney
Growth Habit: 
Subshrub, Shrub
CPC Number: 
2781

Distribution
Protection
Conservation
References


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Malacothamnus clementinusenlarge
Photographer: Dylan Hannon

Malacothamnus clementinusenlarge
Photographer: Bart O'Brien
Image Owner: Personal


Malacothamnus clementinus is Not Sponsored
Primary custodian for this plant in the CPC National Collection of Endangered Plants is: 

 
Malacothamnus clementinus


Malacothamnus clementinus, an evergreen shrub, is a member of the mallow family (Malvaceae). It has numerous ascending branches with large, hairy lobed leaves and produces inflorescences of clustered, pink flowers. M. clementinus is found on sedimentary rock walls and ridges of San Clemente Island, Los Angeles County (CDFG 2002). Introduction of goats to San Clemente Island in the early 1800's has essentially decimated this species (Mohlenbrook 1983). M. clementinus was listed as endangered in August of 1977 (USFWS 1977).

Distribution & Occurrence

State Range
  California
State Range of  Malacothamnus clementinus
Habitat
  Remaining populations of Malacothamnus clementinus are restricted to steep slopes and cliffs (CDFG 2002).

Distribution
  Malacothamnus clementinus is endemic to San Clemente Island, part of the Channel Islands, California (USFWS 1977).

Number Left
  The population for Malacothamnus clementinus is so small that it still remains endangered (CDFG 2002).

Protection

Global Rank:  
G1G3
 
12/16/2005
Guide to Global Ranks
Federal Status:  
LE
 
10/24/1996
Guide to Federal Status
Recovery Plan:  
No
 

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

Conservation, Ecology & Research

Ecological Relationships
  Ecological relationships are unknown.

Threats
  The introduction of alien herbivores more than a century ago has had dramatic negative effects on plant community composition on all of the Channel Islands. These effects include the reduction of native plant cover, density and biomass (USFWS 2000). Intensive herbivory has also facilitated the spread of non-native plants and degraded the soil structure causing severe erosion and the destruction of seed banks (USFWS 2000).
Malacothamnus clementinus habitat is in an area used by the U.S. Navy as a bombing impact zone. This has resulted in increased erosion and the potential for a fire threat (CDFG 2002).

Current Research Summary
  Rancho Santa Ana Botanic Gardens, Claremont, California has collected specimens of this species for propagation (USFWS 2001).

Current Management Summary
  Since the U.S. Navy has removed goats, as a part of its Feral Animal Removal Program, the general condition of native species has improved (CDFG 2002).

Research Management Needs
  Protection from further herbivory, erosion and fire is necessary. Because this species is critically endangered, information on reproductive biology and germination requirements will greatly aid in conservation efforts.

Ex Situ Needs
 

References

Books (Single Authors)

Mohlenbrock, R.H. 1983. Where have all the wildflowers gone? A region-by-region guide to threatened or endangered U.S. wildflowers. New York: Macmillan Publishing Co. Inc. 239p.

Munz, P.A. 1974. A flora of southern California. Berkeley: Univ. California Press. 1086p.

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.

Smith, J.P.; Berg, K. 1988. California native plant society's inventory of rare and endangered vascular plants of California. Sacramento: California Native Plant Society. 168p.

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.

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

Benesh, D.L.; Elisens, W.J. 1999. Morphological variation in Malacothamnus fasciculatus (Torrey & A. Gray) E. Greene (Malvaceae) and related species. Madrono. 46, 3: 142-152.

USFWS. 1976. Proposed Endangered Status for 1700 U.S. Plants. Federal Register. 41: 24523-24572.

USFWS. 1977. Ecosystem Preservation: Seven of San Clemente Island's Endemic Animals, Plants Listed. Endangered Species Technical Bulletin. 2, 9: 4-5.

USFWS. 1977. Endangered Listing of Seven California Channel Island Animals and Plants. Federal Register. 42, 155: 40682-40685.

Reports

Sanguamphai. 1989. 1988 Annual Report on the Status of California's State Listed Threatened and Endangered Plants and Animals. State of California, Department of Fish and Game.

USFWS. 2000. Thirteen plant taxa from the northern Channel Islands Recovery Plan. Portland, Oregon: U.S. Fish & Wildlife Service, Region 1. p.93.


  This profile was updated on 3/4/2010
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