Taxon Report
Ceanothus roderickii KnightPine Hill ceanothus |
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Taxon Summary
Ceanothus roderickii, commonly known as Pine Hill ceanothus, is a perennial evergreen shrub in the Rhamnaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 245 to 1090 meters. Ceanothus roderickii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Ceanothus roderickii Knight |
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Common Name: |
Pine Hill ceanothus |
| Family: | Rhamnaceae |
| Element Code: | PDRHA04190 |
| USDA Plants Symbol: | CERO4 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial evergreen shrub |
| Blooming Period: Apr-Jun | Apr-Jun |
| Elevation: | 245-1090 (805-3575) |
| General Habitats: | Chaparral, Cismontane woodland |
| Microhabitat: | Gabbroic (sometimes), Serpentine (sometimes) |
| Microhabitat Details: | nutrient-deficient forms of gabbro-derived soils characterized by low concentrations of available K, P, S, Fe, and Zn |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | CR |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG; SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 9 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 2 |
| Fair (C) | 2 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 4 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| El Dorado (ELD) | |
| Quads: Name (Quad Code) | |
| Clarksville (3812161), Pilot Hill (3812171), Shingle Springs (3812068) | |
Threat List Data from the CNDDB
| Threat List Total: | 9 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 6 | 67 % | |
| Development | 6 | 66% |
| Road/trail construction/maint. | 4 | 44% |
| Erosion/runoff | 3 | 33% |
| Non-native plant impacts | 3 | 33% |
| ORV activity | 2 | 22% |
| Vandalism/dumping/litter | 2 | 22% |
| Wood cutting or brush clearing | 1 | 11% |
| Recreational use (non-ORV) | 1 | 11% |
| Improper burning regime | 1 | 11% |
Notes
| Threatened by residential development, road widening, vehicles, illegal dumping, and alteration of fire regimes. Possibly threatened by herbivores and non-native plants. See Four Seasons 2(4):23-24 (1968) for original description, Madroño 54(1): 13-21 (2007) for information on the effect of fire on the species, and Madroño 58(1):1-21 (2011) for information on the edaphic ecology and genetics on the species. |
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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 1 February 2025].