Taxon Report
Ceanothus confusus J.T. HowellRincon Ridge ceanothus |
 © 2012 Jake Ruygt |
Taxon Summary
Ceanothus confusus, commonly known as Rincon Ridge ceanothus, is a perennial evergreen shrub in the Rhamnaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Closed-cone coniferous forest, growing at elevations from 75 to 1065 meters. Ceanothus confusus 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 confusus J.T. Howell |
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Common Name: |
Rincon Ridge ceanothus |
| Family: | Rhamnaceae |
| Element Code: | PDRHA04220 |
| USDA Plants Symbol: | CECO6 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial evergreen shrub |
| Blooming Period: Feb-Jun | Feb-Jun |
| Elevation: | 75-1065 (245-3495) |
| General Habitats: | Chaparral, Cismontane woodland, Closed-cone coniferous forest |
| Microhabitat: | Serpentine (sometimes), Volcanic (sometimes) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 33 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 2 |
| Fair (C) | 5 |
| Poor (D) | 0 |
| None (X) | 1 |
| Unknown (U) | 24 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Lake (LAK), Mendocino (MEN), Napa (NAP), Sonoma (SON) | |
| Quads: Name (Quad Code) | |
| Bartlett Mtn. (3912227), Calistoga (3812255)?*, Camp Meeker (3812248), Cloverdale (3812371), Detert Reservoir (3812265), Geyserville (3812268), Guerneville (3812258), Kenwood (3812245), Mark West Springs (3812256), Mount St. Helena (3812266), Purdys Gardens (3912311), Rutherford (3812244), Santa Rosa (3812246), Sebastopol (3812247)*, Sonoma (3812234), St. Helena (3812254), The Geysers (3812277), Whispering Pines (3812276), Yorkville (3812382) | |
Threat List Data from the CNDDB
| Threat List Total: | 9 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 12 | 36 % | |
| Development | 8 | 24% |
| Road/trail construction/maint. | 8 | 24% |
| Agriculture | 4 | 12% |
| ORV activity | 3 | 9% |
| Other | 1 | 3% |
| Recreational use (non-ORV) | 1 | 3% |
| Grazing | 1 | 3% |
| Logging | 1 | 3% |
| Wood cutting or brush clearing | 1 | 3% |
Selected References
| Profile for potential SCC evaluation (2018) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 February 2025].