Lewisia maguirei - A. Holmgren
Maguire's Bitteroot
Taxonomic Status: Accepted
Related ITIS Name(s): Lewisia maguirei A. Holmgren (TSN 20484)
Unique Identifier: ELEMENT_GLOBAL.2.139297
Element Code: PDPOR04090
Informal Taxonomy: Plants, Vascular - Flowering Plants - Purslane Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Caryophyllales Portulacaceae Lewisia
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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: Lewisia maguirei
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 07Sep2011
Global Status Last Changed: 05Sep1990
Rounded Global Status: G1 - Critically Imperiled
Reasons: Known only from 8 sites, all within an 8 km radius in eastern Nye County, Nevada. Protected from most threats by its high elevation habitat but potential threats include horticultural collection, mineral exploration and climate change.
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 Nevada (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Presently known only from the eastern part of Nye County, Nevada. Excluding the most disjuct record, the maximum range dimention is only 2.8 km (Morefield 2001).

Area of Occupancy: 3-125 4-km2 grid cells
Area of Occupancy Comments: It is estimated that the area of occupancy would fit within 4, 2x2 km grid cells (NatureServe element occurrence data 2011).

Number of Occurrences: 1 - 5
Number of Occurrences Comments: Known from 8 occurrences if mapped at 0.16 km separation distance; only 3 occurrences if mapped at 1.0 km separation distance (Morefield 2001).

Population Size Comments: Total estimated individuals 4,700 + (Morefield 2001). Estimated area occupied is 19.4 ha (about 50 acres) (Morefield 2001).

Overall Threat Impact Comments: High elevation habitat protects this species from many forms of threat. Although it is not known to be in international trade, the species is of interest to alpine plant enthusiasts and may be threatened by collection (USFWS and CITES 2002). It has been listed in at least one database of "Rock Garden Plants," a website created in Europe (http://web.kadel.cz/flora/kvSearch.html; accessed June, 2002). It is "very rarely cultivated" (USFWS and CITES 2002) and so a demand for wild collected material may exist. While there may be some pressures on this species due to collection it has been noted it is likely difficult to cultivate, which should help steer collectors away (Dortort 2005). Mineral exploration and possibly grazing are other potential threats. Another threat is climate change, which is known to affect the ecosystem dynamics of high-elevation habitats in the Humboldt-Toiyabie National Forest where this species occurs (USFWS 2011). Cattle trampling is also a threat (NatureServe element occurrence data 2011).

Short-term Trend: Unknown

Long-term Trend: Unknown

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Presently known only from the eastern part of Nye County, Nevada. Excluding the most disjuct record, the maximum range dimention is only 2.8 km (Morefield 2001).

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 Nye (32023)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
16 Hot Creek-Railroad Valleys (16060012)+, Sand Spring-Tikaboo Valleys (16060014)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A small perennial herb that forms rosettes of fleshy leaves, about 3 cm tall. 2-3 flowers bloom close to the leaves in June and early July. Flowers are whitish, but both flowers and leaves are tinged with pink. Blooms in late spring (May-June).
Terrestrial Habitat(s): Bare rock/talus/scree, Forest/Woodland, Woodland - Conifer
Habitat Comments: Dry, sparsely vegetated carbonate scree or shallow gravelly-clay soils on steep slopes and ridgelines of all aspects. In the pinyon-juniper zone at elevations of 2240-2525 m. Associates include Frasera albomarginata, Astragalus calycosus, Hymenoxys acaulis, Allium nevadense, Petradoria pumila. (Morefield, 2001).
Economic Attributes Not yet assessed
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Management Summary
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Stewardship Overview: Lewisia maguirei is a high elevation species which is protected from many threats given the difficulty in accessing it. With that said, activities that would disturb its habitat, namely mineral excavation and related activites, should be avoided. Collection is a possible threat, and land managers should protect locality information.
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: 25Aug2011
NatureServe Conservation Status Factors Author: Greene, L. Maybury/Morefield (1996), rev. Maybury (2002), rev. L. Oliver (2011)
Management Information Edition Date: 28Sep2011
Management Information Edition 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
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  • Anderson, S., M. White, and D. Atwood. 1991. Humboldt National Forest sensitive plant field guide. Ogden, Utah: U.S.D.A., Forest Service, Intermountain Region.

  • DeSanto, J. 1993. USDA Forest Service Region 4 Endangered, Threatened, and Sensitive Plant Form, Lewisia maguirei, Nye County, 15 May-13 June.

  • Dortort, F. 2005a. Under discusstion: Avonia and other succulent Portulaceae. Cactus and Succulent Journal 77(1): 14-20.

  • Holmgren, A. H. 1954. A new Lewisia from Nevada. Leaflets of Western Botany 7: 135-137.

  • 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]. Available as a pdf file at: http://heritage.nv.gov/atlas/atlas.html. Compiled by the Nevada Natural Heritage Program, Carson City, for the U.S. Fish and Wildlife Service, Reno, Nevada.

  • Mozingo, H.N. and M. Williams. 1980. The threatened and endangered plants of Nevada. Portland, Oregon: U. S. Fish and Wildlife Service, and Reno, Nevada: Bureau of Land Management. 268 pp.

  • Mozingo, H.N., and M. Williams. 1980. The threatened and endangered plants of Nevada. U.S. Fish and Wildlife Service and Bureau of Land Management, Portland, OR. 268 pp.

  • U.S. Fish and Wildlife Service (USFWS) and CITES. 2002. Comments of the United States on proposals to ammend appendices I and II of the Convention on International Trand in Endangered Species of Wild Fauna and Flora. Available at: http://international.fws.gov/cop11/tranx1.html. Accessed June 19, 2002.

  • U.S. Forest Service (USFS). 2011. Humboldt-Toiyabe National Forest Climate Change Vulnerability Report, April 2011. Accessed online on 8/25/2011 at: http://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5294901.pdf.

  • Williams, M. J. 1981. Status report on Lewisia maguirei. Portland, Oregon: U. S. Fish and Wildlife Service.

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