Taxon Report
Arctostaphylos auriculata Eastw.Mt. Diablo manzanita |
 © 2006 Steve Matson |
Taxon Summary
Arctostaphylos auriculata, commonly known as Mt. Diablo manzanita, is a perennial evergreen shrub in the Ericaceae that is found only in California. It occurs within Chaparral (sandstone), and Cismontane woodland, growing at elevations from 135 to 650 meters. Arctostaphylos auriculata is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.Classification
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Scientific Name: |
Arctostaphylos auriculata Eastw. |
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Common Name: |
Mt. Diablo manzanita |
| Family: | Ericaceae |
| Element Code: | PDERI04040 |
| USDA Plants Symbol: | ARAU |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial evergreen shrub |
| Blooming Period: Jan-Mar | Jan-Mar |
| Elevation: | 135-650 (445-2135) |
| General Habitats: | Chaparral, Cismontane woodland |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.3 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_UCSC |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 17 |
| Element Occurrence Ranks: | |
| Excellent (A) | 2 |
| Good (B) | 5 |
| Fair (C) | 5 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 5 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Contra Costa (CCA) | |
| Quads: Name (Quad Code) | |
| Antioch South (3712187), Clayton (3712188), Diablo (3712178), Tassajara (3712177) | |
Threat List Data from the CNDDB
| Threat List Total: | 10 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 10 | 59 % | |
| Improper burning regime | 6 | 35% |
| Recreational use (non-ORV) | 6 | 35% |
| Road/trail construction/maint. | 6 | 35% |
| Grazing | 5 | 29% |
| Other | 4 | 23% |
| Development | 2 | 11% |
| Biocides | 1 | 5% |
| ORV activity | 1 | 5% |
| Vandalism/dumping/litter | 1 | 5% |
| Wood cutting or brush clearing | 1 | 5% |
Selected References
| Bulletin of the Torrey Botanical Club 32:202 (1905) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 29 October 2025].