Arabis shockleyi - Munz
Shockley's Rockcress
Synonym(s): Boechera shockleyi (Munz) Dorn
Taxonomic Status: Accepted
Related ITIS Name(s): Arabis shockleyi Munz (TSN 22733)
Unique Identifier: ELEMENT_GLOBAL.2.142388
Element Code: PDBRA061V0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Mustard Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Capparales Brassicaceae Arabis
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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: Arabis shockleyi
Conservation Status
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NatureServe Status

Global Status: G3
Global Status Last Reviewed: 04Feb2009
Global Status Last Changed: 03Aug1988
Rounded Global Status: G3 - Vulnerable
Reasons: Known from the mountains of the northern Mojave Desert and Great Basin in eastern California, Nevada, and western Utah. Approximately 66 occurrences have been mapped and are presumed extant, and an additional 14 are historical; it is very likely that more occurrences will be recorded with further survey and mapping effort. Population size in Nevada, which contains about half of known occurrences, has been estimated at 745+ plants. Prefers limestone and, to a lesser extent, quartzite substrates; concentration in calcareous areas has rendered the species vulnerable to limestone quarrying, particularly in California. Other known threats include mineral extraction and ORVs.
Nation: United States
National Status: N3

U.S. & Canada State/Province Status
United States California (S2), Nevada (S3), Utah (S2?)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Known from the mountains of the northern Mojave Desert (San Bernardino Mountains and desert ranges) and the Great Basin in eastern California (San Bernardino, Inyo, and Mono counties), Nevada (Clark, Lincoln, Mineral, Nye, and White Pine counties), and western Utah (Beaver, Juab, Millard, and Tooele counties) (Hickman 1993, Homgren et al. 2005, Welsh et al. 2008). Also reported from Esmeralda and Elko counties in Nevada, but these records require confirmation. Known range extent is approximately 150,000 square km.

Number of Occurrences: 21 - 300
Number of Occurrences Comments: Rangewide, at least 66 occurrences (likely an underestimate) are presumed extant. In Nevada, 33-38 occurrences are presumed extant (depending on separation distance) and one occurrence is considered extirpated (Morefield 2001). In California, 28 occurrences are presumed extant and an additional 13 are historical. In Utah, occurrences have not been mapped comprehesively, but Welsh et al. (2008) cite 16 specimens in the Brigham Young University herbarium (BYU), collected in four counties.

Population Size Comments: In Nevada, the total population is estimated to comprise 745+ individuals (Morefield 2001). Population estimates from California and Utah are not available.

Overall Threat Impact Comments: In California, threatened by mining (limestone quarries, mineral extraction) and ORVs (CNPS 2009). In Nevada, some occurrences may be threatened, but no known active impacts can be readily identified (Jim Morefield, personal communication 1999). Threats in Utah unknown.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Known from the mountains of the northern Mojave Desert (San Bernardino Mountains and desert ranges) and the Great Basin in eastern California (San Bernardino, Inyo, and Mono counties), Nevada (Clark, Lincoln, Mineral, Nye, and White Pine counties), and western Utah (Beaver, Juab, Millard, and Tooele counties) (Hickman 1993, Homgren et al. 2005, Welsh et al. 2008). Also reported from Esmeralda and Elko counties in Nevada, but these records require confirmation. Known range extent is approximately 150,000 square km.

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA, NV, UT

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Inyo (06027), Mono (06051), San Bernardino (06071)
NV Clark (32003), Esmeralda (32009)*, Lincoln (32017), Mineral (32021)*, Nye (32023), White Pine (32033)
UT Millard (49027)*
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
15 White (15010011)+, Muddy (15010012)+, Meadow Valley Wash (15010013)+, Las Vegas Wash (15010015)+
16 Hamlin-Snake Valleys (16020301)+*, Spring-Steptoe Valleys (16060008)+, Fish Lake-Soda Spring Valleys (16060010)+, Hot Creek-Railroad Valleys (16060012)+, Sand Spring-Tikaboo Valleys (16060014)+
18 Santa Ana (18070203)+, Crowley Lake (18090102)+, Eureka-Saline Valleys (18090201)+, Death Valley-Lower Amargosa (18090203)+*, Mojave (18090208)+, Southern Mojave (18100100)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A biennial or perennial herb 13-38 cm tall, usually with one stout stem (occasionally 2 or 3). Plants are densely covered with wooly gray hairs. Basal leaves are densely clustered and stem leaves are lance-shaped, numerous and overlapping. Four petals are lavender to pink and narrow, and fruits (siliques) are often purplish. Blooms April-June, often fruiting through July.
Diagnostic Characteristics: Characterized by (1) a multi-layered basal rosette, (2) hoary-gray pubescence of leaves, stems, and inflorescences, and (3) arching glabrous siliques that are large compared to other species in the genus (Welsh et al. 2008).
Terrestrial Habitat(s): Bare rock/talus/scree, Desert, Forest/Woodland, Shrubland/chaparral, Woodland - Conifer
Habitat Comments: Tends to occur on calcareous substrates, such as limestone or dolomitic outcrops, gravels, and sediments; also occurs on quartzite rock and sands. Many sites are on rocky ridges and slopes. Often in pinyon-juniper woodlands; also occurs in sagebrush scrub, mountain mahogany, shadscale-galleta, and ephedra-matchweed communities. 875 - 2600 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
Help
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: 27May1999
NatureServe Conservation Status Factors Author: Gries, D., rev. K. Gravuer (2009)

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
  • Beatley, J.C. 1977. Threatened plant species of the Nevada Test Site, Ash Meadows, and central-southern Nevada. Prepared for U.S. Energy Research and Development Administration under Contract E(11-1)-2307.

  • California Native Plant Society (CNPS). 2009. Inventory of Rare and Endangered Plants. California Native Plant Society. Sacramento, CA. Online. Available: http://www.cnps.org/inventory (accessed 2009).

  • Dorn, R. D. 2003. A new species of Boechera (Brassicaceae) from Utah and Colorado. Brittonia 55: 1-3.

  • Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.

  • Holmgren, N.H., P.K. Holmgren, and A. Cronquist. 2005. Intermountain flora. Volume 2, part B. Subclass Dilleniidae. The New York Botanical Garden Press. 488 pages.

  • 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.

  • Nevada Natural Heritage Program. 1999. February 19-last update. List of sensitive plants. Online. Available: http://www.state.nv.us/nvnhp/sensplnt.htm. Accessed 1999, June 3.

  • Rollins, R.C. 1981. Studies on Arabis (Cruciferae) of western North America. Systematic Botany 6(1): 55-64.

  • 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.

  • Welsh, S.L., N.D. Atwood, S. Goodrich and L.C. Higgins. (Eds.) 2008. A Utah Flora. 4th edition, revised. Brigham Young University, Provo, Utah, U.S.A. 1019 pp.

  • Welsh, S.L., N.D. Atwood, S. Goodrich, and L.C. Higgins (eds.) 1993. A Utah flora. 2nd edition. Brigham Young Univ., Provo, Utah. 986 pp.

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