Taxon Report
Arctostaphylos osoensis WellsOso manzanita |
 David Graber |
Taxon Summary
Arctostaphylos osoensis, commonly known as Oso manzanita, is a perennial evergreen shrub in the Ericaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 95 to 500 meters. Arctostaphylos osoensis is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Arctostaphylos osoensis Wells |
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Common Name: |
Oso manzanita |
| Family: | Ericaceae |
| Element Code: | PDERI042S0 |
| USDA Plants Symbol: | AROS |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial evergreen shrub |
| Blooming Period: Feb-Mar | Feb-Mar |
| Elevation: | 95-500 (310-1640) |
| General Habitats: | Chaparral, Cismontane woodland |
| Microhabitat: | |
| Microhabitat Details: | dacite porphyry buttes |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| 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: | 11 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 0 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 10 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| San Luis Obispo (SLO) | |
| Quads: Name (Quad Code) | |
| Morro Bay South (3512037), San Luis Obispo (3512036) | |
Threat List Data from the CNDDB
| Threat List Total: | 0 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 0 | % | |
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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].