Cirsium clokeyi - Blake
Clokey's Thistle
Synonym(s): Cirsium eatonii var. clokeyi (S.F. Blake) D.J. Keil
Taxonomic Status: Accepted
Related ITIS Name(s): Cirsium eatonii var. clokeyi (S.F. Blake) D.J. Keil (TSN 780839)
Unique Identifier: ELEMENT_GLOBAL.2.140268
Element Code: PDAST2E0R0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Aster Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Asterales Asteraceae Cirsium
Check this box to expand all report sections:
Concept Reference
Help
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: Cirsium clokeyi
Taxonomic Comments: Treated as Cirsium eatonii var. clokeyi in Flora of North America Editorial Committee (2006).
Conservation Status
Help

NatureServe Status

Global Status: G2
Global Status Last Reviewed: 03May2013
Global Status Last Changed: 03May2013
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: G2 - Imperiled
Reasons: A Nevada endemic with about 12 known occurrences, all at higher elevations, primarily in the core area of the Spring Mountains. Threats include habitat alteration, climate change, recreation and exotic species.
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 Nevada (S2S3)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: One mountain range in Clark County, Nevada within approximately 58 sq km (NatureServe data 2013).

Area of Occupancy: 6-25 4-km2 grid cells
Area of Occupancy Comments: 15 4x4km grid cells

Number of Occurrences: 6 - 20
Number of Occurrences Comments: Twelve occurrences, all found on the Spring Mountains. Morefield (2001) note that surveys have been extensive but that are substantially incomplete.

Population Size Comments: In 2001 it was estimated that the population size was 9,422 individuals (Morefield).

Overall Threat Impact: Medium - low
Overall Threat Impact Comments: An 'Adaptive Management Report for Clark County, Nevada, Multiple Species Habitat Conservation Plan (MSHCP)' was written in 2008 for all of Clark County, Nevada in response to an Incidental Take Permit held by Clark County, Nevada Department of Transportation and several cities. The Incidental Take Permit allows up to 145,000 acres of habitat loss to take place over 30 years beginning in January 2001 (Sada et al. 2008). Cirsium clokeyi is endemic to Clark County, Nevada, Spring Mountains and is considered in the MSHCP. It is estimated that approximately 13% of the considered sites of C. clokeyi in the Plan will be lost due to direct human impacts from the Permit (Sada et al. 2008). Sada et al. 2008 note the following major threats to the communities in which Cirsium clokeyi is found: Climate Change, Recreation, and change in fire regime (i.e. mega fires). Sada et al. (2008) notes Climate Change is a major threat to the Spring Mountains because are completely surrounded by desert which has isolated the Alpine ecosystem where C. clokeyi occurs. C. clokeyi occurs in other habitat types in the Spring Mountains including Mixed-conifer and Bristlecone Pine (where cold temperature is a major system driver) ecosystems (Sada et al. 2008). Also, it occurs in alpine habitat adjacent to hiking trails (Morefield 2001). Finally, exotic species are a threat.

Short-term Trend: Decline of <30% to relatively stable
Short-term Trend Comments: Some decline is expected due to the Incidental Take Permit granted to Clark Co., Nevada, which is referenced in the Multiple Species Habitat Conservation Plan (MSHCP), which estimates 13% of locations in the management plan may be affected (Sada et al. 2008).

Other NatureServe Conservation Status Information

Distribution
Help
Global Range: One mountain range in Clark County, Nevada within approximately 58 sq km (NatureServe data 2013).

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 NV

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
NV Clark (32003)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
15 Las Vegas Wash (15010015)+
16 Ivanpah-Pahrump Valleys (16060015)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
Help
Basic Description: A biennial or perennial herb, 1-2 m tall, with long, deeply lobed leaves covered with large yellow spines. Flower heads (July-August) are rose-purple, subtended by spiny bracts. The species is a nectar source for the endemic Spring Mountains comma skipper (Hesperia comma ssp. 1) and the regional endemic Nevada admiral (Limenitis weidmeyerii nevadae).
Riverine Habitat(s): SPRING/SPRING BROOK
Terrestrial Habitat(s): Forest - Conifer, Forest/Woodland
Habitat Comments: Open, moist gravelly slopes and ridges at 2280-3400 m elevation in openings of mixed conifer and bristlecone pine forests and on disturbed ground such as avalanche paths. Also occurs in seep areas, drainage bottoms, and snow depressions over carbonate soils (Morefield 2001).
Economic Attributes Not yet assessed
Help
Management Summary Not yet assessed
Help
Population/Occurrence Delineation Not yet assessed
Help
Population/Occurrence Viability
Help
U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
Help
Authors/Contributors
Help
NatureServe Conservation Status Factors Edition Date: 02May2013
NatureServe Conservation Status Factors Author: Oliver, L.

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
  • Flora of North America Editorial Committee. 2006a. Flora of North America North of Mexico. Vol. 19. Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford University Press, New York. xxiv + 579 pp.

  • Kartesz, J.T. 1988. A flora of Nevada. Ph.D. dissertation. Univ. of Nevada, Reno. 3 volumes. 1729 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.

  • Morefield, J. D., editor. 2001. Nevada rare plant atlas [with rare plant fact sheets]. Compiled by the Nevada Natural Heritage Program, Carson City, for the U.S. Fish and Wildlife Service. [http://heritage.nv.gov/atlas/atlas.html]

  • Sada, D., M. Stone, D. Mouat, J. Lancaster, P. Lee, S. MacCabe, L. Bice, M. Hamilton and S. Wainscott. 2008a. Adaptive Management Report for the Clark County, Nevada, Multiple Species Habitat Conservation Plan. Clark County, Nevada. Department of Air Quality and Environmental Management. Desert Conservation Program. 500 South Grand Central Parkway. Las Vegas, Nevada 89155-5201. Accessed online on 4_13_2013 at: http://www.clarkcountynv.gov/Depts/dcp/Documents/Library/dcp%20reports/2008/2008_AMR_ReportAndAppendices.pdf

Use Guidelines & Citation

Use Guidelines and Citation

The Small Print: Trademark, Copyright, Citation Guidelines, Restrictions on Use, and Information Disclaimer.

Note: All species and ecological community data presented in NatureServe Explorer at http://explorer.natureserve.org were updated to be current with NatureServe's central databases as of March 2019.
Note: This report was printed on

Trademark Notice: "NatureServe", NatureServe Explorer, The NatureServe logo, and all other names of NatureServe programs referenced herein are trademarks of NatureServe. Any other product or company names mentioned herein are the trademarks of their respective owners.

Copyright Notice: Copyright © 2019 NatureServe, 2511 Richmond (Jefferson Davis) Highway, Suite 930, Arlington, VA 22202, U.S.A. All Rights Reserved. Each document delivered from this server or web site may contain other proprietary notices and copyright information relating to that document. The following citation should be used in any published materials which reference the web site.

Citation for data on website including State Distribution, Watershed, and Reptile Range maps:
NatureServe. 2019. NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available http://explorer.natureserve.org. (Accessed:

Citation for Bird Range Maps of North America:
Ridgely, R.S., T.F. Allnutt, T. Brooks, D.K. McNicol, D.W. Mehlman, B.E. Young, and J.R. Zook. 2003. Digital Distribution Maps of the Birds of the Western Hemisphere, version 1.0. NatureServe, Arlington, Virginia, USA.

Acknowledgement Statement for Bird Range Maps of North America:
"Data provided by NatureServe in collaboration with Robert Ridgely, James Zook, The Nature Conservancy - Migratory Bird Program, Conservation International - CABS, World Wildlife Fund - US, and Environment Canada - WILDSPACE."

Citation for Mammal Range Maps of North America:
Patterson, B.D., G. Ceballos, W. Sechrest, M.F. Tognelli, T. Brooks, L. Luna, P. Ortega, I. Salazar, and B.E. Young. 2003. Digital Distribution Maps of the Mammals of the Western Hemisphere, version 1.0. NatureServe, Arlington, Virginia, USA.

Acknowledgement Statement for Mammal Range Maps of North America:
"Data provided by NatureServe in collaboration with Bruce Patterson, Wes Sechrest, Marcelo Tognelli, Gerardo Ceballos, The Nature Conservancy-Migratory Bird Program, Conservation International-CABS, World Wildlife Fund-US, and Environment Canada-WILDSPACE."

Citation for Amphibian Range Maps of the Western Hemisphere:
IUCN, Conservation International, and NatureServe. 2004. Global Amphibian Assessment. IUCN, Conservation International, and NatureServe, Washington, DC and Arlington, Virginia, USA.

Acknowledgement Statement for Amphibian Range Maps of the Western Hemisphere:
"Data developed as part of the Global Amphibian Assessment and provided by IUCN-World Conservation Union, Conservation International and NatureServe."

NOTE: Full metadata for the Bird Range Maps of North America is available at:
http://www.natureserve.org/library/birdDistributionmapsmetadatav1.pdf.

Full metadata for the Mammal Range Maps of North America is available at:
http://www.natureserve.org/library/mammalsDistributionmetadatav1.pdf.

Restrictions on Use: Permission to use, copy and distribute documents delivered from this server is hereby granted under the following conditions:
  1. The above copyright notice must appear in all copies;
  2. Any use of the documents available from this server must be for informational purposes only and in no instance for commercial purposes;
  3. Some data may be downloaded to files and altered in format for analytical purposes, however the data should still be referenced using the citation above;
  4. No graphics available from this server can be used, copied or distributed separate from the accompanying text. Any rights not expressly granted herein are reserved by NatureServe. Nothing contained herein shall be construed as conferring by implication, estoppel, or otherwise any license or right under any trademark of NatureServe. No trademark owned by NatureServe may be used in advertising or promotion pertaining to the distribution of documents delivered from this server without specific advance permission from NatureServe. Except as expressly provided above, nothing contained herein shall be construed as conferring any license or right under any NatureServe copyright.
Information Warranty Disclaimer: All documents and related graphics provided by this server and any other documents which are referenced by or linked to this server are provided "as is" without warranty as to the currentness, completeness, or accuracy of any specific data. NatureServe hereby disclaims all warranties and conditions with regard to any documents provided by this server or any other documents which are referenced by or linked to this server, including but not limited to all implied warranties and conditions of merchantibility, fitness for a particular purpose, and non-infringement. NatureServe makes no representations about the suitability of the information delivered from this server or any other documents that are referenced to or linked to this server. In no event shall NatureServe be liable for any special, indirect, incidental, consequential damages, or for damages of any kind arising out of or in connection with the use or performance of information contained in any documents provided by this server or in any other documents which are referenced by or linked to this server, under any theory of liability used. NatureServe may update or make changes to the documents provided by this server at any time without notice; however, NatureServe makes no commitment to update the information contained herein. Since the data in the central databases are continually being updated, it is advisable to refresh data retrieved at least once a year after its receipt. The data provided is for planning, assessment, and informational purposes. Site specific projects or activities should be reviewed for potential environmental impacts with appropriate regulatory agencies. If ground-disturbing activities are proposed on a site, the appropriate state natural heritage program(s) or conservation data center can be contacted for a site-specific review of the project area (see Visit Local Programs).

Feedback Request: NatureServe encourages users to let us know of any errors or significant omissions that you find in the data through (see Contact Us). Your comments will be very valuable in improving the overall quality of our databases for the benefit of all users.