Arctostaphylos confertiflora - Eastw.
Santa Rosa Island Manzanita
Other Common Names: Santa Rosa Island manzanita
Taxonomic Status: Accepted
Related ITIS Name(s): Arctostaphylos confertiflora Eastw. (TSN 23478)
Unique Identifier: ELEMENT_GLOBAL.2.136943
Element Code: PDERI040A0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Heath Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Ericales Ericaceae Arctostaphylos
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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: Arctostaphylos confertiflora
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 30Mar2016
Global Status Last Changed: 16Dec2014
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: Endemic to Santa Rosa Island off the coast of southern California. The island's ecosystems have been drastically affected by the grazing, browsing, and trampling of introduced mammals. Cattle grazing and elk and deer browsing have resulted in reproductive failure in this species and seriously threaten the small populations. Ungulates have access to more than 90 percent of the plants. All the northern Channel Islands have suffered profound loss and degradation of their soils and changes in their plant communities due to the large numbers of non-native mammals introduced to the islands starting in the early 1800's. However, populations seem to be rebounding or remaining stable perhaps due to some efforts to mitigate threats.
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 (S2)

Other Statuses

U.S. Endangered Species Act (USESA): LE: Listed endangered (31Jul1997)
Comments on USESA: Arctostaphylos confertiflora was proposed endangered on July 25, 1995 and determined endangered on July 31, 1997.
U.S. Fish & Wildlife Service Lead Region: R8 - California-Nevada

NatureServe Global Conservation Status Factors

Range Extent Comments: California endemic only found on Santa Rosa Island.

Area of Occupancy: 6-25 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 1 - 5

Overall Threat Impact: Low
Overall Threat Impact Comments: Cattle grazing and elk and deer browsing have resulted in reproductive failure in this species and seriously threaten the small populations. Ungulates have access to more than 90 percent of the plants. All the northern Channel Islands have suffered profound loss and degradation of their soils and changes in their plant communities due to the large numbers of non-native mammals introduced to the islands starting in the early 1800's. As of 2001 the California Native Plant Society reported that cattle grazing and feral herbivores were still threats.

Short-term Trend Comments: Plant numbers appear to be stable or increasing as of 2006.

Other NatureServe Conservation Status Information

Distribution
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Global Range: California endemic only found on Santa Rosa Island.

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 Santa Barbara (06083)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Santa Barbara Channel Islands (18060014)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A shrub, up to 2 m high, but often much shorter, with smooth red-purple bark and overlapping, light green, evergreen leaves. Urn-shaped flowers (February-April) and reddish berry-like fruits are borne in dense clusters.
Terrestrial Habitat(s): Forest/Woodland, Shrubland/chaparral, Woodland - Conifer, Woodland - Mixed
Habitat Comments: Scattered on sedimentary substrates (shales, volcanoclastic sediments, and sandstone) in chaparral, mixed woodland, and pine woodland communities. Extant plants are mostly on very steep slopes.
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: 30Mar2016
NatureServe Conservation Status Factors Author: Maybury, K., rev. L. Oliver (2003), rev. Bittman and Treher (2016)

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
  • California Native Plant Society (CNPS). 2001. Inventory of Rare and Endangered Plants of California (sixth edition). Rare Plant Scientific Advisory Committee, David P. Tibor, Convening Editor. California Native Plant Society. Sacramento, CA. x + 388pp.

  • Flora of North America Editorial Committee. 2009. Flora of North America North of Mexico. Vol. 8. Magnoliophyta: Paeoniaceae to Ericaceae. Oxford University Press, New York. xxiv + 585 pp.

  • 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.

  • U.S. Fish and Wildlife Service (USFWS. 1995. Proposed rule for 16 plant taxa from the northern Channel Islands, California. Federal Register 60(142): 37993-38010.

  • U.S. Fish and Wildlife Service. 1997. Final rule for 13 plant taxa from the northern Channel Islands, California. Federal Register 62(147): 40954-40974.

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