Roadless Areas
Home/Species/ Tiehm's Rockcress

Boechera tiehmii

(Rollins) Al-Shehbaz

Tiehm's Rockcress

G3Vulnerable Found in 2 roadless areas NatureServe Explorer →
G3VulnerableGlobal Rank
LowThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.127958
Element CodePDBRA06280
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderCapparales
FamilyBrassicaceae
GenusBoechera
Synonyms
Arabis tiehmiiRollins
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
Treated by FNA (2010, vol. 7) in the genus Boechera.
Conservation Status
Rank MethodLegacy Rank calculation - Excel v3.1x
Review Date2016-03-18
Change Date2016-03-18
Edition Date2016-08-23
Edition AuthorsMorefield, J. (1999). L. Oliver rev. (2003), R. Bittman (2005), rev. Bittman (2016)
Threat ImpactLow
Range Extent100-250 square km (about 40-100 square miles)
Number of Occurrences6 - 20
Rank Reasons
Known from 11 occurrences in remote high-elevation parts of the Sierra Nevada, many in Wilderness areas. Known areas separated by about 100 miles, with unsurveyed habitat in between. Over 15,000 plants are known, but total acreage covered may only be just over 100 acres. Threats are minimal including trail use and perhaps roadwork near the highway roadcut population. Most populations are unthreatened in high alpine habitats.
Range Extent Comments
Known from Mt. Rose in Washoe County, Nevada and Tioga Pass, Mt. Dana, and Dunderberg Peak in Mono County, California. Likely between the known areas (J. Morefield, 1999).
Occurrences Comments
Nine occurrences in California and 2 in Nevada. All but one California site is historic but is believed due to the lack of threats and remoteness of sites, that sites are extant.
Threat Impact Comments
Sites in California may be impacted by trail use as one population is bisected by a trail and another near a trail (CNDDB 2003). A third site is located near a highway roadcut. Overall sites in California aren't considered that endangered (CNPS 2001). In Nevada, this species is not very threatened due to it's in accessible habitat. There may be occasional off-trail foot traffic near the sites in Nevada, however, the species grows on steep slopes not very close to trails (Morefield 2001).
Ecology & Habitat

Habitat

Subalpine rock outcrops.
Terrestrial Habitats
Bare rock/talus/scree
Other Nations (1)
United StatesN3
ProvinceRankNative
NevadaS1Yes
CaliforniaS3Yes
Plant Characteristics
Economic Value (Genus)No
Roadless Areas (2)
California (1)
AreaForestAcres
Robinson PeakHumboldt-Toiyabe National Forest5,835
Nevada (1)
AreaForestAcres
Rose - GalenaHumboldt-Toiyabe National Forest3,711
References (7)
  1. California Department of Fish and Game. 1998. Natural Diversity Database (RareFind 2), Version 2.1.0, August 31, 1998.
  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). 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.
  4. 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.
  5. 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.
  6. Morefield, J.D. 1994. Status report for <i>Arabis tiehmii</i> Rollins (1983). Nevada Natural Heritage Program, Carson City, prepared for the U.S. Fish and Wildlife Service, Reno.
  7. 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.