CPC National Collection Plant Profile
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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 |
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Primary
custodian for this plant in the CPC National Collection of Endangered
Plants is: |
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Dudleya abramsii ssp. parva
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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 |
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State Range
Habitat
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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
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Western end of the Simi Hills along the Montclef Ridge to the Conejo Grade (approximately 16 km (10mi) in distance). (USFWS 1997) |
Number Left
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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) |
State/Area
Protection
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State/Area |
Rank |
Status |
Date |
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California |
S2.1 |
5 |
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Conservation,
Ecology & Research |
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Ecological
Relationships
Threats
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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
Current Management Summary
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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
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• Protect this plant in as many populations as possible. |
Ex Situ Needs
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• Maintain a genetically representative seed bank. |
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Books (Sections)
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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.
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Electronic Sources
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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).
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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.
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Journal Articles
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USFWS. 1997. Determination of endangered status for two plants and threatened status for four plants from southern California. Federal Register. 62, 19: 4172-4183.
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Reports
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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.
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This
profile was updated on 9/28/2010 |
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