Taxon Report
Euphorbia ocellata Durand & Hilg. ssp. rattanii (S. Watson) OudejansStony Creek spurge |
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Classification
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Scientific Name: |
Euphorbia ocellata Durand & Hilg. ssp. rattanii (S. Watson) Oudejans |
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Common Name: |
Stony Creek spurge |
| Family: | Euphorbiaceae |
| Element Code: | PDEUP0D1P1 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: May-Oct | May-Oct |
| Elevation: | 65-800 (215-2625) |
| General Habitats: | Chaparral, Riparian scrub, Valley and foothill grassland |
| Microhabitat: | |
| Microhabitat Details: |
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 |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 39 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 4 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 34 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Glenn (GLE), Tehama (TEH) | |
| Quads: Name (Quad Code) | |
| Black Butte Dam (3912273), Chrome (3912265), Cold Fork (4012226), Corning (3912282), Elk Creek (3912255), Gerber (4012212), Hall Ridge (3912276), Henleyville (3912283), Inskip Hill (4012138), Kirkwood (3912272), Los Molinos (4012211), Lowrey (4012215), Newville (3912275), Paskenta (3912285), Raglin Ridge (4012216), Sehorn Creek (3912274), Stonyford (3912245) | |
Threat List Data from the CNDDB
| Threat List Total: | 8 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 7 | 18 % | |
| Foot traffic/trampling | 4 | 10% |
| Grazing | 4 | 10% |
| ORV activity | 2 | 5% |
| Other | 2 | 5% |
| Recreational use (non-ORV) | 1 | 2% |
| Mining | 1 | 2% |
| Altered flood/tidal/hydrologic regime | 1 | 2% |
| Development | 1 | 2% |
Notes
| Threatened by foot trampling, recreational activities, and vehicles. Can be confused with ssp. ocellata. See Proceedings of the American Academy of Arts and Sciences 20:372 (1885) for original description, Phytologia 67(1):47 (1989) for revised nomenclature, and Taxon 55:397-420 (2006) for taxonomic treatment. |
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Threats: |
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Taxonomy: |
Selected References
| USFS Potential Species of Conservation Concern Profile |
Citation
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].