CPC National Collection Plant Profile

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CPC National Collection Plant Profile

Dudleya abramsii ssp. parva


Family: 
Crassulaceae  
Common Names: 
Abrams' parva, Conejo dudleya, Serpentine dudleya
Author: 
(Rose & A. Davids.) Bartel
Growth Habit: 
Forb/herb
CPC Number: 
1527

Distribution
Protection
Conservation
References


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Dudleya abramsii ssp. parva is Not Sponsored
Primary custodian for this plant in the CPC National Collection of Endangered Plants is: 

 
Dudleya abramsii ssp. parva


This species is threatened by a number of urban development activities, and is limited to only eleven sites in the wild. It was listed as Federally Endangered by the U.S. Fish and Wildlife Service in 1997. (USFWS 1997) This species occurs in a very unique habitat, and is unique even among other species in the Dudleya genus. This species has a flowering stalk that grows from 5 to 18 cm in length, tipped with pale yellow flowers that are often flecked with red on the keel. The fact that this species has yellow flowers distinguishes it from other local Dudleya species, which all have white flowers. These other local Dudleya species are evergreen, while the Conejo live-forever is vernal, with its rosette of linear leaves withering by early summer. (USFWS 1997, 1999, 2002)

Distribution & Occurrence

State Range
  California
State Range of  Dudleya abramsii ssp. parva
Habitat
  This species is found on the rock outcrops and soils derived from Miocene Conejo volcanics in grassland and coastal sage scrub habitats. (USFWS 1997)

Distribution
  Western end of the Simi Hills along the Montclef Ridge to the Conejo Grade (approximately 16 km (10mi) in distance). (USFWS 1997)

Number Left
  There are eleven current sites along a ten mile stretch of Mountclef Ridge. Sites have from 25 to a few thousand individuals, with the majority containing numbers in the hundreds. (USFWS 1997)

Protection

Global Rank:  
G3T2
 
4/21/1997
Guide to Global Ranks
Federal Status:  
LT
 
1/29/1997
Guide to Federal Status
Recovery Plan:  
Yes
 

State/Area Protection
  State/Area Rank Status Date  
  California S2.1 5  

Conservation, Ecology & Research

Ecological Relationships
  None known.

Threats
  Primary threats involve urban development, including construction of housing, golf courses and infrastructure. Other threats include trampling from hikers, off-road vehicles and equestrian use, as well as fire suppression activities and collection by plant collectors. (USFWS 1997)

Current Research Summary
  None known.

Current Management Summary
  Some of the land where this species is found on land that the Conejo Open Space Conservation Agency (COSCA) designates as "open space". The remaining populations are found on privately-owned property. Proportions of populations of this species on private property have been extirpated by development projects in the cities of Agoura Hills, Thousand Oaks, and Westlake Village. Population pressures for development on these private lands continues to increase. (USFWS 1997, 2002)

Research Management Needs
  Protect this plant in as many populations as possible.

Ex Situ Needs
  Maintain a genetically representative seed bank.

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.

Electronic Sources

NatureServe. (2008). NatureServe Explorer: An online encyclopedia of life [web application]. [Internet].Version 7.0. NatureServe, Arlington, Virginia. http://www.natureserve.org/explorer. Accessed: (June 17, 2008).

USFWS. (2002). Threatened & Endangered Plants Within Ventura Field and Wildlife Office Area of Responsibility. U.S. Fish and Wildlife Service, Ventura Fish and Wildlife Office. http://ventura.fws.gov/plant.html. Accessed: 2002.

Journal Articles

USFWS. 1997. Determination of endangered status for two plants and threatened status for four plants from southern California. Federal Register. 62, 19: 4172-4183.

Reports

USFWS. 1999. Recovery Plan for Six Plants from the Mountains Surrounding the Los Angeles Basin. Portland, Oregon: U.S. Fish and Wildlife Service. p.63.


  This profile was updated on 9/28/2010
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