CPC Plant Profile: Conejo Dudleya
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Plant Profile

Conejo Dudleya (Dudleya abramsii ssp. parva)

Description
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: Federally Threatened
  • Family: Crassulaceae
  • State: CA
  • Nature Serve ID: 146554
  • Date Inducted in National Collection: 02/10/1987

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)

Participating Institutions
Updates
  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 2 accessions of Dudleya parva in orthodox seed collection. There are as many as 15292 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 2 seed accessions of Dudleya parva from 2 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 125 maternal plants

Nature Serve Biotics
  • 05/02/2017

Restricted to a specific volcanic substrate in the mountains forming the western boundary of the Los Angeles Basin, California. The total range is about 16 km long. There are 11 populations, most numbering in the hundreds of individuals. Threats include hiking and horseback riding, urban development, and fire suppression.

  • 01/01/2010

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 pl

  • 01/01/2010

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)

  • 01/01/2010

None known.

  • 01/01/2010

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)

  • 01/01/2010

Protect this plant in as many populations as possible.

  • 01/01/2010

Maintain a genetically representative seed bank.

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Photos
Nomenclature
Taxon Dudleya abramsii ssp. parva
Authority (Rose & Davidson) Bartel
Family Crassulaceae
CPC Number 1527
ITIS 524928
USDA DUABP
Common Names Abrams' parva | Conejo dudleya | Serpentine dudleya
Associated Scientific Names Dudleya abramsii ssp. parva | Dudleya parva
Distribution Western end of the Simi Hills along the Montclef Ridge to the Conejo Grade (approximately 16 km (10mi) in distance). (USFWS 1997)
State Rank
State State Rank
California S2
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)

Ecological Relationships

None known.

Pollinators
Common Name Name in Text Association Type Source InteractionID

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