Taxon Report
Dudleya abramsii Rose ssp. affinis K. NakaiSan Bernardino Mountains dudleya |
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Taxon Summary
Dudleya abramsii ssp. affinis, commonly known as San Bernardino Mountains dudleya, is a perennial herb in the Crassulaceae that is found only in California. It occurs within Pebble (Pavement) plain, Pinyon and juniper woodland, and Upper montane coniferous forest, growing at elevations from 1250 to 2600 meters. Dudleya abramsii ssp. affinis 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 abramsii Rose ssp. affinis K. Nakai |
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Common Name: |
San Bernardino Mountains dudleya |
| Family: | Crassulaceae |
| Element Code: | PDCRA04013 |
| USDA Plants Symbol: | DUABA2 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: Apr-Jul | Apr-Jul |
| Elevation: | 1250-2600 (4100-8530) |
| General Habitats: | Pebble (Pavement) plain, Pinyon and juniper woodland, Upper montane coniferous forest |
| Microhabitat: | Carbonate (sometimes), Granitic (sometimes) |
| Microhabitat Details: | sometimes quartzite |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G4T2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_CalBG/RSABG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 54 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 7 |
| Fair (C) | 1 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 46 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| San Bernardino (SBD) | |
| Quads: Name (Quad Code) | |
| Apple Valley South (3411742), Big Bear City (3411637), Butler Peak (3411731), Fawnskin (3411638), Lake Arrowhead (3411732), Moonridge (3411627), Onyx Peak (3411626), Rattlesnake Canyon (3411636) | |
Threat List Data from the CNDDB
| Threat List Total: | 11 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 18 | 33 % | |
| ORV activity | 8 | 14% |
| Mining | 7 | 12% |
| Foot traffic/trampling | 5 | 9% |
| Non-native plant impacts | 3 | 5% |
| Road/trail construction/maint. | 3 | 5% |
| Vandalism/dumping/litter | 2 | 3% |
| Grazing | 2 | 3% |
| Improper burning regime | 1 | 1% |
| Other | 1 | 1% |
| Recreational use (non-ORV) | 1 | 1% |
| Development | 1 | 1% |
Notes
| Known only from the San Bernardino Mtns. Threatened by development, foot traffic, limestone mining, and vehicles. Possibly threatened by non-native plants and illegal dumping. See Madroño 34(4):349 (1987) for original description. |
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Threats: |
| Threatened by development, foot traffic, limestone mining, and vehicles. Possibly threatened by non-native plants and illegal dumping. |
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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 22 November 2025].