Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Historic Range:
U.S.A. (CA)

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Physical Description

Type Information

Type collection for Dudleya parva Rose & Davidson
Catalog Number: US 1319815
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): J. Bullard
Year Collected: 1922
Locality: Conejo Grande., California, United States, North America
  • Type collection: Davidson, A. 1923. Bull. S. Calif. Acad. Sci. 22: 5.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Type collection for Dudleya parva Rose & Davidson
Catalog Number: US 1319812
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): J. Bullard
Year Collected: 1922
Locality: Conejo Grande., California, United States, North America
  • Type collection: Davidson, A. 1923. Bull. S. Calif. Acad. Sci. 22: 5.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Type collection for Dudleya parva Rose & Davidson
Catalog Number: US 1319816
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): J. Bullard
Year Collected: 1922
Locality: Bank of Conejo Grande., California, United States, North America
  • Type collection: Davidson, A. 1923. Bull. S. Calif. Acad. Sci. 22: 5.
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© Smithsonian Institution, National Museum of Natural History, Department of Botany

Source: National Museum of Natural History Collections

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Ecology

Habitat

Comments: Clays at the base of scattered rock outcrops of the Conejo volcanics in grassland or coastal sage scrub vegetation.

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N2 - Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: T2 - Imperiled

Reasons: 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.

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Current Listing Status Summary

Status: Threatened
Date Listed: 01/29/1997
Lead Region:   California/Nevada Region (Region 8) 
Where Listed:


Population detail:

Listing status: T

For most current information and documents related to the conservation status and management of Dudleya abramsii parva, see its USFWS Species Profile

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Threats

Comments: The major threats to Dudleya abramsii ssp. parva are urban and recreational development (USFWS 2009). This includes equestrian facilities and activities, recreational activity (mountain biking, off-road vehicles, hiking, rock climbing, and horseback riding), and fire suppression activities that invite non-native annuals that outcompete Dudleya abramsii ssp. parva (USFWS 2009).

Other threats include naturally caused events (such as drought, disease, or rock slides) due to Dudleya abramsii ssp. parva's restricted range and the small population size, especially wildfires which tend to burn much more intensely than the type of fire this taxon is adapted to (USFWS 2009). It is possible that horticultural collection may be a threat as well (USFWS 2009).

Predation by an unknown native caterpillar has been reported in many locations, but is not necessarily considered a threat currently (USFWS 2009). Likewise, climate change is also listed as a possible threat but the extent of this threat is not yet known (USFWS 2009).

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