Taxon Report
Dudleya parva Rose & Davids.Conejo dudleya |
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Taxon Summary
Dudleya parva, commonly known as Conejo dudleya, is a perennial herb in the Crassulaceae that is found only in California. It occurs within Coastal scrub, and Valley and foothill grassland, growing at elevations from 60 to 450 meters. Dudleya parva is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Dudleya parva Rose & Davids. |
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Common Name: |
Conejo dudleya |
| Family: | Crassulaceae |
| Element Code: | PDCRA04016 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: May-Jun | May-Jun |
| Elevation: | 60-450 (195-1475) |
| General Habitats: | Coastal scrub, Valley and foothill grassland |
| Microhabitat: | Clay (sometimes), Gravelly (sometimes), Rocky (sometimes), Volcanic (sometimes) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | FT |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 13 |
| Element Occurrence Ranks: | |
| Excellent (A) | 2 |
| Good (B) | 5 |
| Fair (C) | 4 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 2 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Ventura (VEN) | |
| Quads: Name (Quad Code) | |
| Newbury Park (3411828), Simi (3411837), Thousand Oaks (3411827) | |
Threat List Data from the CNDDB
| Threat List Total: | 7 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 9 | 69 % | |
| Development | 6 | 46% |
| Non-native plant impacts | 5 | 38% |
| Recreational use (non-ORV) | 2 | 15% |
| Agriculture | 1 | 7% |
| ORV activity | 1 | 7% |
| Foot traffic/trampling | 1 | 7% |
| Grazing | 1 | 7% |
Notes
| Known only from the western end of Simi Hills to Conejo Grade. Threatened by horticultural collecting, recreation, vehicles, and urbanization. Potentially threatened by development. Federally-listed as D. abramsii ssp. parva; see this name in The Jepson Manual (1993). See Bulletin of the Southern California Academy of Sciences 22:5 (1923) for original description, and Madroño 30(3):191 (1983) for distributional information. |
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Threats: |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 30 October 2025].