Taxon Report
Ambrosia chenopodiifolia (Benth.) PayneSan Diego bur-sage |
 © 2020 Keir Morse |
Taxon Summary
Ambrosia chenopodiifolia, commonly known as San Diego bur-sage, is a perennial shrub in the Asteraceae that is found in California and elsewhere. It occurs within Coastal scrub, growing at elevations from 55 to 155 meters. Ambrosia chenopodiifolia is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Ambrosia chenopodiifolia (Benth.) Payne |
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Common Name: |
San Diego bur-sage |
| Family: | Asteraceae |
| Element Code: | PDAST0C080 |
| USDA Plants Symbol: | AMCH5 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial shrub |
| Blooming Period: Apr-Jun | Apr-Jun |
| Elevation: | 55-155 (180-510) |
| General Habitats: | Coastal scrub |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 2B.1 |
| Global Rank: | G2G3 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG; SB_CRES |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 21 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 3 |
| Fair (C) | 2 |
| Poor (D) | 0 |
| None (X) | 2 |
| Unknown (U) | 14 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Imperial Beach (3211751), National City (3211761), Otay Mesa (3211658) | |
Threat List Data from the CNDDB
| Threat List Total: | 10 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 15 | 71 % | |
| Development | 11 | 52% |
| ORV activity | 6 | 28% |
| Vandalism/dumping/litter | 3 | 14% |
| Road/trail construction/maint. | 2 | 9% |
| Non-native plant impacts | 2 | 9% |
| Foot traffic/trampling | 2 | 9% |
| Grazing | 1 | 4% |
| Mining | 1 | 4% |
| Agriculture | 1 | 4% |
| Recreational use (non-ORV) | 1 | 4% |
Selected References
| The Botany of the Voyage of H.M.S. Sulphur 26. (1844) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 1 November 2025].