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Boechera dispar

(M.E. Jones) Al-Shehbaz

Pinyon Rockcress

G3Vulnerable Found in 1 roadless area NatureServe Explorer →
G3VulnerableGlobal Rank
High - mediumThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.157137
Element CodePDBRA060F0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderCapparales
FamilyBrassicaceae
GenusBoechera
Synonyms
Arabis disparM.E. Jones
Other Common Names
Unequal Rockcress (EN)
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.
Taxonomic Comments
Arabis dispar is treated by Flora of North America Editorial Committee (2010, vol. 7) in the genus Boechera.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2023-02-22
Change Date1987-08-06
Edition Date2022-12-23
Edition AuthorsGries, D. (1987), L. Oliver (2003), rev. K. Gravuer (2009), rev. A. Tomaino (2022)
Threat ImpactHigh - medium
Range Extent20,000-200,000 square km (about 8000-80,000 square miles)
Number of Occurrences21 - 300
Rank Reasons
Boechera dispar is known from southeast California and adjacent Nevada. Most occurrences, 70-90, are in California, with four in Nevada. Threats include mining, non-native plants, recreational activities, grazing, and development.
Range Extent Comments
Boechera dispar is known from southeast California from the White Mountains south through the Panamint and Argus mountains to the San Bernardino and Little San Bernardino Mountains; disjunct in Nevada in Mineral County (Huntoon Mountains) and southern Nye County (Eleana Range) (Holmgren et al. 2005).
Occurrences Comments
In California, there are 66 occurrences last observed since 2002, and 31 occurrences last observed earlier (CNDDB 2022). There are 4 occurrences in Nevada (NatureServe 2022).
Threat Impact Comments
Threats in California include mining, non-native plants, recreational activities, road construction, military uses, grazing, and vehicles (R. Bittman pers. comm., 2009, CNDDB 2022, CNPS 2022). In Nevada, there are potential threats from mining, development, and military activities (J. Morefield, pers. comm., 1999).
Ecology & Habitat

Habitat

Boechera dispar occurs on loose gravelly slopes and compact talus, often on granitic substrates. These slopes are found within plant communities including sagebrush scrub, pinyon-juniper woodland, Joshua tree woodland, and Mojavean desert scrub (Holmgren et al. 2005, Flora of North America Editorial Committee 2010, CNPS 2022).
Terrestrial Habitats
Forest/WoodlandWoodland - ConiferShrubland/chaparralDesertBare rock/talus/scree
Other Nations (1)
United StatesN3
ProvinceRankNative
NevadaS1Yes
CaliforniaS3Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentRestricted (11-30%)Moderate or 11-30% pop. decline—
2 - Agriculture & aquacultureRestricted (11-30%)Moderate or 11-30% pop. decline—
2.3 - Livestock farming & ranchingRestricted (11-30%)Moderate or 11-30% pop. decline—
3 - Energy production & miningRestricted (11-30%)Moderate or 11-30% pop. decline—
3.2 - Mining & quarryingRestricted (11-30%)Moderate or 11-30% pop. decline—
4 - Transportation & service corridorsSmall (1-10%)Slight or 1-10% pop. decline—
6 - Human intrusions & disturbanceLarge - restrictedModerate or 11-30% pop. decline—
6.1 - Recreational activitiesLarge - restrictedModerate or 11-30% pop. decline—
8 - Invasive & other problematic species, genes & diseasesRestricted (11-30%)Moderate or 11-30% pop. decline—
8.1 - Invasive non-native/alien species/diseasesRestricted (11-30%)Moderate or 11-30% pop. decline—

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Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (1)
California (1)
AreaForestAcres
Soldier CanyonInyo National Forest40,589
References (15)
  1. Baldwin, B. G., D. H. Goldman, D. J. Keil, R. Patterson, T. J. Rosatti, and D. H. Wilken, eds. 2012. The Jepson manual: vascular plants of California. 2nd edition. University of California Press, Berkeley, CA. 1568 pp.
  2. California Department of Fish and Game. 2000. Natural Diversity Database (RareFind 2), Version 2.1.2, January 25, 2000. Downloaded in 2003.
  3. 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).
  4. California Native Plant Society (CNPS), Rare Plant Program. 2022. Inventory of Rare and Endangered Plants of California, online edition, v9-01 1.0. Online. Available: https://www.rareplants.cnps.org (accessed 2022).
  5. California Natural Diversity Database (CNDDB). 2022. RareFind Version 5.2.14. California Department of Fish and Game, Sacramento.
  6. Flora of North America Editorial Committee (FNA). 2010. Flora of North America north of Mexico. Vol. 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford University Press, New York. xxii + 797 pp.
  7. Global Biodiversity Information Facility (GBIF). 2022. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2022).
  8. Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
  9. 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.
  10. Kartesz, J.T. 1988. A flora of Nevada. Ph.D. dissertation. Univ. of Nevada, Reno. 3 volumes. 1729 pp.
  11. 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.
  12. Morefield, Jim. Personal Communication. Botanist, Nevada Natural Heritage Program, Department of Conservation and Natural Resources, Carson City, Nevada.
  13. NatureServe. 2022. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  14. 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.
  15. Rollins, R.C. 1993a. The Cruciferae of continental North America: Systematics of the mustard family from the Arctic to Panama. Stanford Univ. Press, Stanford, California. 976 pp.