Arabis rectissima var. simulans - Rollins
Bristly-leaf Rockcress
Taxonomic Status: Accepted
Related ITIS Name(s): Arabis rectissima var. simulans Rollins (TSN 531262)
Unique Identifier: ELEMENT_GLOBAL.2.147053
Element Code: PDBRA061P1
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. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
Concept Reference Code: B99KAR01HQUS
Name Used in Concept Reference: Arabis rectissima var. simulans
Taxonomic Comments: Described by Rollins in 1993. May be better treated as a variety of Arabis holboellii based on intergradation patterns observed in the field (Morefield 2003). Flora of North America Editorial Committee (2010) notes that plants assigned to var. simulans appear to be hybrids between Boechera rectissima and B. retrofracta.
Conservation Status
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NatureServe Status

Global Status: G4G5T1Q
Global Status Last Reviewed: 23Aug2014
Global Status Last Changed: 08Jan1998
Ranking Methodology Used: Ranked by calculator
Rounded Global Status: T1 - Critically Imperiled
Reasons: Endemic to the northern Carson Range, Nevada.  Known from two closely separated areas with high recreational use.  Threatened by recreation impacts, logging, fire suppression and catastrophic fire.
Nation: United States
National Status: N1

U.S. & Canada State/Province Status
United States Nevada (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Endemic to the north half of the Carson Range in northwestern Douglas and southwestern Washoe counties, Nevada (Morefield 2003).

Area of Occupancy: 3-5 4-km2 grid cells
Area of Occupancy Comments: Approximately five to seven 4-sq km grid cells (EO data in the NatureServe central database as of February 2014). 
 

Number of Occurrences: 6 - 20
Number of Occurrences Comments: Approximately 10 extant occurrences (EO data in the NatureServe central database as of February 2014) in two closely separate areas (Morefield 2003). 

Population Size Comments: Approximately 1138 plants (Morefield 2003).

Overall Threat Impact: High
Overall Threat Impact Comments: Threats include recreational development and use, timber harvest, fire suppression and lack of normal forest succession, catastrophic fire, hybridization with Arabis holboellii (Morefield 2001, 2003).  As of 2003 "significant impacts and some small amounts of permanent habitat loss from one or more of these sources had been observed at most of the known populations, although the viability of most did not yet appear compromised" (Morefield 2003).

Other NatureServe Conservation Status Information

Distribution
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Global Range: Endemic to the north half of the Carson Range in northwestern Douglas and southwestern Washoe counties, Nevada (Morefield 2003).

U.S. States and Canadian Provinces
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 Douglas (32005), Washoe (32031)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
16 Lake Tahoe (16050101)+, Truckee (16050102)+, Upper Carson (16050201)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Perennial herb to 12 dm high with white flowers, coarsely and sparsely hairy basal leaves with some teeth, and straight, strictly reflexed fruits
Terrestrial Habitat(s): Forest - Conifer, Forest/Woodland
Habitat Comments: Sparsely littered floor of yellow pine forest.  "Dry, sandy, granitic or andesitic soil on mostly gentle slopes of all aspects, in full or filtered sunlight of thinly littered openings in mature, open Pinus jeffreyi-Abies concolor forests. Densities highest on very light and recovered disturbances, excluded from areas of bare ground, deep litter, dense tree or shrub cover, or intense disturbance" (Morefield 2001).
Economic Attributes Not yet assessed
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Management Summary
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Stewardship Overview: Minimize impacts from recreational use.   Design and implement strategies to address threats from fire suppression.  Conduct further surveys and taxonomic studies (Morefield 2003).
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: 23Aug2014
NatureServe Conservation Status Factors Author: J. Morefield, NVHP, rev. A. Tomaino (2014)
Management Information Edition Date: 23Aug2014
Management Information Edition Author: Tomaino, A.

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. 2010. Flora of North America North of Mexico. Vol. 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford University Press, New York. xxii + 797 pp.

  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Morefield, J.D. 2003. Conservation Status Report for Arabis rectissima E. Greene var. simulans Rollins (Brassicaceae), the Washoe Tall Rockcress. Status report prepared for U.S. Fish and Wildlife Service, Reno, Nevada. [http://heritage.nv.gov/sites/default/files/library/arrstext.pdf]

  • 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.

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