Taxon Report
Euphorbia jaegeri V.W. Steinmann & J. Andre´Orocopia Mountains spurge |
 Keir Morse |
Taxon Summary
Euphorbia jaegeri, commonly known as Orocopia Mountains spurge, is a perennial shrub in the Euphorbiaceae that is found only in California. It occurs within Mojavean desert scrub, growing at elevations from 600 to 850 meters. Euphorbia jaegeri is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Euphorbia jaegeri V.W. Steinmann & J. Andre´ |
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Common Name: |
Orocopia Mountains spurge |
| Family: | Euphorbiaceae |
| Element Code: | PDEUP0Q440 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial shrub |
| Blooming Period: Oct-May | Oct-May |
| Elevation: | 600-850 (1970-2790) |
| General Habitats: | Mojavean desert scrub |
| Microhabitat: | Carbonate, Granitic, Gravelly (sometimes), Metamorphic, Rocky |
| Microhabitat Details: | Rocky hillsides and arroyos, gravelly or rocky crevices |
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_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 4 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 1 |
| Fair (C) | 3 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 0 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Riverside (RIV), San Bernardino (SBD) | |
| Quads: Name (Quad Code) | |
| Amboy (3411556), Cadiz (3411555), East of Siberia (3411567), Hayfield (3311566) | |
Threat List Data from the CNDDB
| Threat List Total: | 3 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 4 | 100 % | |
| Development | 4 | 100% |
| Mining | 3 | 75% |
| Road/trail construction/maint. | 1 | 25% |
Notes
| Known only from the Bristol, Marble, and Orocopia Mtns. Potentially occurs in the Coxcomb, Eagle, Iron, and Sheephole Mtns.; needs field surveys. |
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Threats: |
| Threatened by road maintenance and mining. Potentially threatened by wind energy development. |
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Taxonomy: |
| Similar to E. polycarpa and E. setiloba (see Chamaesyce polycarpa and C. setiloba in TJM 2). Not in TJM 2. See Aliso 30:1-4 (2012) for original description. |
Selected References
| CRPR List Addition on 2013-01-17 |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 16 November 2025].