Ambrosia chenopodiifolia - (Benth.) Payne
San Diego Bursage
Other English Common Names: San Diego Bur-ragweed
Other Common Names: San Diego bur ragweed
Taxonomic Status: Accepted
Related ITIS Name(s): Ambrosia chenopodiifolia (Benth.) Payne (TSN 36503)
Unique Identifier: ELEMENT_GLOBAL.2.143921
Element Code: PDAST0C080
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Ambrosia
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Ambrosia chenopodiifolia
Conservation Status
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NatureServe Status

Global Status: G3?
Global Status Last Reviewed: 12Sep2007
Global Status Last Changed: 12Sep2007
Rounded Global Status: G3 - Vulnerable
Reasons: Ambrosia chenopodiifolia is known from southern California, where there are only about 10 sites, south into Baja, Mexico where there are probably numerous sites. The number of plants is only known for California where there are 1400 (as of 2005), but there are likely to be many thousands south of the border. The threats are fairly severe in CA; Baja threats are unknown.
Nation: United States
National Status: N2

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States California (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: The range in CA is only about 40 sq mi, since this plant just barely gets into the United States. However, it ranges quite far south in Baja.

Area of Occupancy: Unknown 4-km2 grid cells
Area of Occupancy Comments: Unknown.

Number of Occurrences: 21 - 300
Number of Occurrences Comments: 10 extant in California as of 2005. Unknown number of occurrences in Baja, Mexico. Distribution in Baja extends pretty far south so there are likey large numbers of occurrences there.

Population Size Comments: California has at least 1400 plants as of 2005. There are likely many thousands of plants in Baja.

Number of Occurrences with Good Viability/Integrity: Very few to few (1-12)
Viability/Integrity Comments: Three occurrences in CA are good-excellent. There must be at least a few in Baja with good viability.

Overall Threat Impact: High
Overall Threat Impact Comments: Threats recorded for CA occurrences include border patrol activities, trampling, vehicle trampling, development, gravel mining, dumping, and invasive plants. In Baja, threats may be slightly less since the plant ranges over a wider area, but locally probably includes development and other threats.

Short-term Trend: Unknown

Long-term Trend: Unknown

Intrinsic Vulnerability Comments: Probably not intrinsically vulnerable.

Environmental Specificity: Broad. Generalist or community with all key requirements common.
Environmental Specificity Comments: Pretty broad, occurring in coastal scrub from southern CA south far into Baja, Mexico.

Other NatureServe Conservation Status Information

Distribution
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Global Range: The range in CA is only about 40 sq mi, since this plant just barely gets into the United States. However, it ranges quite far south in Baja.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA

Range Map
No map available.

National Distribution Outside of U.S. & Canada: Mexico

U.S. Distribution by County Help
State County Name (FIPS Code)
CA San Diego (06073)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 San Diego (18070304)+, Cottonwood-Tijuana (18070305)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History Not yet assessed
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Basic Description: Shrub to 3.5m tall, much branched. Stems slender, tough, green to red-brown, tomentose or becoming glabrous. Leaves 1-3cm, ovate, entire to palmately 3-lobed, white-hairy. Small flowers; bur-like fruit; body densely woolly and with hooked spines.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 10Jun2005
NatureServe Conservation Status Factors Author: R. Bittman

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Flora of North America Editorial Committee. 2006c. Flora of North America North of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 pp.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

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