Roadless Areas
Home/Species/ Encinitis Baccharis

Baccharis vanessae

Beauchamp

Encinitis Baccharis

G1Critically Imperiled Found in 2 roadless areas NatureServe Explorer →
G1Critically ImperiledGlobal Rank
Very high - mediumThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.157399
Element CodePDAST0W0P0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusBaccharis
Other Common Names
Encinitis False Willow (EN) Encinitis false willow (EN)
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.
Conservation Status
Review Date2015-12-01
Change Date1993-07-06
Edition Date1987-06-26
Edition AuthorsBittman, R.L.; Rev. C. Annable, rev. Maybury (1997)
Threat ImpactVery high - medium
Range Extent250-20,000 square km (about 100-8000 square miles)
Number of Occurrences6 - 20
Rank 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.
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.
Occurrences Comments
Thirteen occurrences, about six of which are ranked B or better.
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).
Ecology & Habitat

Diagnostic Characteristics

Pistillate involucres funnel-shaped, base glandular-puberulent; delicate phyllaries narrowly tapered, generally puberulent, which are reflexed at maturity. It has filiform leaves.

Habitat

Steep slopes; sandstone and volcanic (1 site) substrates in fairly open southern maritime chaparral and dense mixed chaparral communities. 60-335 m elevation.
Terrestrial Habitats
Shrubland/chaparral
Other Nations (1)
United StatesN1
ProvinceRankNative
CaliforniaS1Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentPervasive - largeSerious or 31-70% pop. declineHigh - moderate
1.1 - Housing & urban areasPervasive - largeSerious or 31-70% pop. declineHigh - moderate
6 - Human intrusions & disturbancePervasive - largeModerate or 11-30% pop. declineHigh (continuing)
6.1 - Recreational activitiesPervasive - largeModerate or 11-30% pop. declineHigh (continuing)
7 - Natural system modificationsPervasive - largeSerious or 31-70% pop. declineModerate (short-term)
7.1 - Fire & fire suppressionPervasive - largeSerious or 31-70% pop. declineModerate (short-term)
8 - Invasive & other problematic species, genes & diseasesPervasive - largeModerate or 11-30% pop. declineHigh (continuing)
8.1 - Invasive non-native/alien species/diseasesPervasive - largeModerate or 11-30% pop. declineHigh (continuing)
11 - Climate change & severe weatherPervasive - largeSerious or 31-70% pop. declineModerate (short-term)
11.2 - DroughtsPervasive - largeSerious or 31-70% pop. declineModerate (short-term)

—

Plant Characteristics
DurationPERENNIAL, Long-lived
Economic Value (Genus)No
Roadless Areas (2)
California (2)
AreaForestAcres
TrabucoCleveland National Forest23,341
WildhorseCleveland National Forest1,483
References (5)
  1. Boyd, S., T. Ross, and O. Mistretta. 1993. Noteworthy collections: Baccharis vanesae. Madrono 40(2): 133.
  2. Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
  3. 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.
  4. 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.
  5. U.S. Fish and Wildlife Service (USFWS). 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.