Arctostaphylos morroensis - Wies. & Schreib.
Morro Manzanita
Other Common Names: Morro manzanita
Taxonomic Status: Accepted
Related ITIS Name(s): Arctostaphylos morroensis Wies. & Schreib. (TSN 23501)
Unique Identifier: ELEMENT_GLOBAL.2.139178
Element Code: PDERI040S0
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 morroensis
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 09Sep2016
Global Status Last Changed: 09Sep2016
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G1 - Critically Imperiled
Reasons: Known only from western San Luis Obispo County, California and restricted to a particular substrate. The species is locally abundant but potential habitat has been reduced by development to about one-third of its estimated historic level. Half of the remaining habitat is in small patches in and around developed areas; half is more continuous and supports dense stands (over 50 percent cover) of this species.
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 (15Dec1994)
Comments on USESA: Arctostaphylos morroensis was proposed endangered on December 21, 1991 and determined threatened on December 15, 1994.
U.S. Fish & Wildlife Service Lead Region: R8 - California-Nevada

NatureServe Global Conservation Status Factors

Range Extent Comments: Endemic to the Morro Bay region of San Luis Obispo County, California.

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

Number of Occurrences: 1 - 20
Number of Occurrences Comments: Six occurrence but three were last surveyed 37 or more years ago (CNDDB 2017).

Number of Occurrences with Good Viability/Integrity: Very few (1-3)

Overall Threat Impact: High
Overall Threat Impact Comments: Alteration or destruction of habitat due to urbanization, alternate fire regimes and possibly by non-native plants (veldt grass (Ehrharta calycina); Eucalyptus, narrow-leafed iceplant (Conicosia pugioniformis), and Bridal creeper (Asparagus asparagoides))  (CNPS 2001; USFWS 2013). Development of homes and roads are by far the major threat (CNDDB 2003) but increasing amounts of the species habitat is being converted to managed lands (USFWS 2013). In addition, ORV use is a threat (CNDDB 2003).

Intrinsic Vulnerability Comments: Occurs on "soils developed on ancient sand dunes that were deposited during the Pleistocene (i.e., Baywood fine sands) (USFS 2013)."

Other NatureServe Conservation Status Information

Distribution
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Global Range: Endemic to the Morro Bay region of San Luis Obispo County, California.

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 Luis Obispo (06079)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Central Coastal (18060006)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: An evergreen shrub, 1-4 m tall, with shaggy bark, spreading branches, and with leaves that are dark green above and grayish with dense, woolly hairs below. Produces clusters of white-pinkish, urn-shaped flowers (January-March), followed by orange-brown, berry-like fruits.
Duration: PERENNIAL, Long-lived
Reproduction Comments: Species is an obligate seeder and mass germination is triggered by fire (USFWS 2013). Many seed fall to ground the near the parent plant but birds large mammals incluidng coyote (Canis latrans) and mule deer (Odocoileus hemionus) contribute to longer distance dispersal.
Terrestrial Habitat(s): Forest/Woodland, Shrubland/chaparral, Woodland - Hardwood
Habitat Comments: Soils derived from ancient sand dunes. Found in nearly pure stands on steep slopes, especially on north exposures. On low-moderate slopes, found in association with coastal dune scrub, maritime chaparral, and coast live oak woodland communities. < 200 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: 18Oct2017
NatureServe Conservation Status Factors Author: Bittman, R.L., rev. C. Russell, rev. Maybury (1997), rev. L. Oliver (2003), rev. Treher and Bittman (2017)

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 Department of Fish and Game. 2000. Natural Diversity Database (RareFind 2), Version 2.1.2, January 25, 2000. Downloaded in 2003.

  • 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.

  • California Natural Diversity Database (CNDDB). 2017. RareFind Version  5.2.14. California Department of Fish and Game, Sacramento.

  • 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. 1994. Endangered or threatened status for five plants and the Morro shoulderband snail from western San Luis Obispo County, California. Federal Register 59(240): 64613-64623.

  • United States Fish and Wildlife Service (USFWS). 2013. Arctostaphylos morroensis (Morro Manzanita) 5-Year Review: Summary and Evaluation. USFWS Ventura Fish & Wildlife Office Ventura, California. 21 pp.

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