Baccharis vanessae - Beauchamp
Encinitis Baccharis
Other English Common Names: Encinitis False Willow
Other Common Names: Encinitis false willow
Taxonomic Status: Accepted
Related ITIS Name(s): Baccharis vanessae R.M. Beauch. (TSN 183764)
Unique Identifier: ELEMENT_GLOBAL.2.157399
Element Code: PDAST0W0P0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Baccharis
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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: Baccharis vanessae
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 01Dec2015
Global Status Last Changed: 06Jul1993
Rounded Global Status: G1 - Critically Imperiled
Reasons: Known only from a 70 by 30 km stretch of western San Diego County, California. There are about 15 extant populations known with about 2,000 individuals in total (several populations have only a few individuals). Half of the populations are threatened by proposed development projects. Intense, mostly recent urbanization of the species' habitat has extirpated at least 5 populations.
Nation: United States
National Status: N1

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

U.S. Endangered Species Act (USESA): LT: Listed threatened (07Oct1996)
U.S. Fish & Wildlife Service Lead Region: R8 - California-Nevada

NatureServe Global Conservation Status Factors

Range Extent Comments: Endemic to a narrow band of central-coastal San Diego County, California, from Encinitas eastward to Woodson Mountain, near Poway and southward to Mira Mesa; an area of ca 30 km E-W by 17 km N-S.

Number of Occurrences: 6 - 20
Number of Occurrences Comments: Thirteen occurrences, about six of which are ranked B or better.

Overall Threat Impact: Very high - medium
Overall Threat Impact Comments: Genetic viability is reduced in small populations, making them vulnerable to extinction by a single human-caused or natural event, such as drought, fire, or residential development. Unidentified pollinators or wildlife species functioning as seed-dispersal agents may be impacted by development. Habitat fragmentation and isolation in addition to fuel modification, threaten the taxa where they grow adjacent to or mixed within residential areas. In addition, the US Fish and Wildlife Service indicate the following threats trampling, alien plants, fire control, development activity and limited numbers (1996).

Other NatureServe Conservation Status Information

Distribution
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Global Range: Endemic to a narrow band of central-coastal San Diego County, California, from Encinitas eastward to Woodson Mountain, near Poway and southward to Mira Mesa; an area of ca 30 km E-W by 17 km N-S.

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.


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 Aliso-San Onofre (18070301)+, San Luis Rey-Escondido (18070303)+, San Diego (18070304)+, Cottonwood-Tijuana (18070305)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A shrub, < 2 m tall, broom-like in appearance with dense, erect branches, often leafless when the plants are in flower. Leaves are linear. Herbage is generally sticky-resinous. Whitish flower heads, lacking rays, bloom in the fall (August-November), Male and female flowers are borne on separate plants.
Technical Description: Shrub < 2 m from root crown, generally glabrous, sticky. Stems: branches dense, erect, often leafless at flower, glabrous (except glandular-puberulent below heads). Leaves sessile, 1-45 mm, linear, entire; principal veins 1. Inflorescence: heads in a raceme or open panicle, or few-headed cluster; involucre funnel-shaped, 5.5-6.8 mm, phyllaries in 4 series, narrowly tapered, thick, rounded on back, generally glandular-puberulent, tip acute to long-tapered; receptacle +/- convex, honeycombed, puberulent, chaff 0. Staminate flowers 15-22; corollas 4 mm; pappus 4 mm. Pistillate flowers +/- 25; corollas +/-2.5 mm. Fruit 2-3 mm puberulent; pappus 7-10 mm. 2n =18 (Hickman, 1993).
Diagnostic Characteristics: Pistillate involucres funnel-shaped, base glandular-puberulent; delicate phyllaries narrowly tapered, generally puberulent, which are reflexed at maturity. It has filiform leaves.
Duration: PERENNIAL, Long-lived
Terrestrial Habitat(s): Shrubland/chaparral
Habitat Comments: Steep slopes; sandstone and volcanic (1 site) substrates in fairly open southern maritime chaparral and dense mixed chaparral communities. 60-335 m elevation.
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: 26Jun1987
NatureServe Conservation Status Factors Author: Bittman, R.L.; Rev. C. Annable, rev. Maybury (1997)
Element Ecology & Life History Edition Date: 21Dec1993
Element Ecology & Life History Author(s): ANNABLE, C.

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
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  • Boyd, S., T. Ross, and O. Mistretta. 1993. Noteworthy collections: Baccharis vanesae. Madrono 40(2): 133.

  • Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 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.

  • Roberts, F. M. Jr. 1993. Endangered and threatened wildlife and plants: Proposed rule for six southern maritime chaparral plant taxa from coastal southern California and northwestern Baja California, Mexico. Federal Register 58(89): 51302-51311.

  • U.S. Fish and Wildlife Service. 1996. Determination of endangered or threatened status for four southern maritime chaparral plant taxa from coastal southern California and northwestern Baja California, Mexico. Federal Register 61(195): 52370-52384.

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