Layia discoidea - (Keck) Keck
Rayless Layia
Taxonomic Status: Accepted
Related ITIS Name(s): Layia discoidea D.D. Keck (TSN 37860)
Unique Identifier: ELEMENT_GLOBAL.2.130179
Element Code: PDAST5N030
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Layia
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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: Layia discoidea
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 12Jan2006
Global Status Last Changed: 15Oct1985
Rounded Global Status: G2 - Imperiled
Reasons: Endemic to California, Layia discoidea is known from San Benito and Fresno Counties. The plant covers a small area and is endemic to serpentine. No sites are permanently protected, though many occur on BLM lands. Unfortunately, they occur in an area very popular with off road enthusiasts, both motorcycles and larger vehicles. These recreationists tear up the landscape and destroy rare plant habitat. Better information on the current status of this plant is urgently needed.
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: Layia discoidea occurs on serpentines in San Benito and Fresno counties. The known range covers about 72 sq miles.

Area of Occupancy: 1-125 4-km2 grid cells
Area of Occupancy Comments: Area occupied covers about 130 acres; however several EO's are mapped too non-specifically to have acreage estimates.

Number of Occurrences: 6 - 20
Number of Occurrences Comments: 20 EO's are known, but 17 are historic in that they haven't been reported on for over 20 years.

Population Size Comments: Only about 1280 plants are known, but the data are primarily from the 1970's and early 1980's.

Number of Occurrences with Good Viability/Integrity: Very few (1-3)
Viability/Integrity Comments: 3 EO's are ranked good or better.

Overall Threat Impact: High - medium
Overall Threat Impact Comments: Several sites list ORV or motorcycle damage as threats.

Short-term Trend: Decline of <30% to relatively stable
Short-term Trend Comments: Short term trend is estimated to be stable to slightly declining.

Long-term Trend: Decline of <50% to Relatively Stable
Long-term Trend Comments: Long term trend is estimated to be slightly to moderately declining.

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: Serpentine endemic from only 2 counties in California.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Layia discoidea occurs on serpentines in San Benito and Fresno counties. The known range covers about 72 sq miles.

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 Fresno (06019), San Benito (06069)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Upper Dry (18030009)+*, Tulare-Buena Vista Lakes (18030012)+, Panoche-San Luis Reservoir (18040014)+, Pajaro (18060002)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Annual, non-scented but glandular. Heads discoid (no ray flowers). Pappus of irregular, notched scales.
Terrestrial Habitat(s): Bare rock/talus/scree, Barrens, Forest - Conifer, Forest/Woodland, Shrubland/chaparral, Woodland - Mixed
Habitat Comments: Serpentine talus slopes and alluvial terraces within Chaparral, Foothill/Cismontane Woodland, and Yellow Pine Forest communities. 795 - 1585 m.
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: 12Jan2006
NatureServe Conservation Status Factors Author: D. Gries; rev. R. Bittman 2006

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
  • CalFlora. 2005. Information on California plants for education, research and conservation. Berkeley, California: The CalFlora Database [web application]. Available: http://www.calflora.org/. (Accessed 2005)

  • 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.

  • 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.

  • Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 pp.

  • Skinner, M.W., and B.M. Pavlik, eds. 1997 (1994). Inventory of rare and endangered vascular plants of California. 1997 Electronic Inventory Update of 1994 5th edition, California Native Plant Society, Special Publication No. 1, Sacramento.

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