Arabis pinzliae - Rollins
Pinzl's Rockcress
Synonym(s): Boechera pinzliae (Rollins) Al-Shehbaz
Taxonomic Status: Accepted
Related ITIS Name(s): Arabis pinzliae Rollins (TSN 184471)
Unique Identifier: ELEMENT_GLOBAL.2.128570
Element Code: PDBRA06270
Informal Taxonomy: Plants, Vascular - Flowering Plants - Mustard Family
Image 12130

© James D. Morefield

 
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 pinzliae
Taxonomic Comments: USFWS uses spelling variant A. 'PINZLAE' (9/93). Originially published as "A. PINZLAE" but corrected following ICBN (1994) 60(C)(b) (named for Ann Pinzl, so ending should be 'iae'.) (1/97).
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 04Feb2009
Global Status Last Changed: 09May1996
Rounded Global Status: G2 - Imperiled
Reasons: A narrow alpine endemic, known primarily from the Boundary Peak area in the White Mountains straddling the California/Nevada border, and from one disjunct Sierra Nevada occurrence in western Mono County, California. Depending on the mapping criteria, Nevada plants comprise either nine smaller occurrences or two larger ones; California has a total of two distinct occurrences. The total number of individuals appears to be around 2500. This species is believed to be minimally threatened in both states due to its inaccessible habitat; minor threats include foot and pack horse traffic and feral horses.
Nation: United States
National Status: N2

U.S. & Canada State/Province Status
United States California (S1), Nevada (S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: White Mountains in Esmeralda County, Nevada (Boundary Peak area) and adjacent Mono County, California. Also one disjunct occurrence known from the Sierra Nevada Mountains, California in western Mono County.

Number of Occurrences: 1 - 20
Number of Occurrences Comments: In Nevada, 9 occurrences are mapped at 0.1 mile separation, but a separation distance of 0.6 miles (1 km) would recommend aggregating these into just 2 separate occurrences (Morefield 2001). In California, 2 occurrences have been mapped, 1 near the Nevada occurrences and 1 at a disjunct locality in western Mono County.

Population Size Comments: 2350 individuals in Nevada (Morefield 2001). One California occurrence has about 100 plants; the size of the other is unknown.

Number of Occurrences with Good Viability/Integrity: Few (4-12)
Viability/Integrity Comments: The majority of occurrences are believed to have excellent or good viability.

Overall Threat Impact Comments: In Nevada this species is minimally threatened due to its inaccessible habitat, however, foot traffic, pack horses and feral horses do pose a threat. This species is tolerant of somewhat loose soils (Morefield 2001).
No threats are currently known at the California sites; at least one of the two sites is relatively remote with difficult access.

Intrinsic Vulnerability Comments: Unknown.

Other NatureServe Conservation Status Information

Distribution
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Global Range: White Mountains in Esmeralda County, Nevada (Boundary Peak area) and adjacent Mono County, California. Also one disjunct occurrence known from the Sierra Nevada Mountains, California in western Mono County.

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

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

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA Mono (06051)
NV Esmeralda (32009)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
16 Fish Lake-Soda Spring Valleys (16060010)+
18 Crowley Lake (18090102)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A small perennial herb, 3-8 cm high, with disproportionately large purple fruit (pods), which are sometimes as large or larger than the entire plant. Flowers are purple tinged; flowers late-spring to summer (May-June), fruits in July and August.
Diagnostic Characteristics: Easily to identify in the field when in fruit due to its disproportionately large purple pods, which are often as large or larger than the entire plant (Kartesz 1988). Per Rollins (1982), closely related to A. pygmaea and A. platysperma. The one to three erect or ascending siliques of A. pinzliae are narrower than in either of the other species. Its seeds are also smaller, less flattened, and more narrowly winged than either of the other species. Also distinguished by its trichomes, which are dendritically-branched with many branches, fine, and densely packed on the leaf surface; A. pygmaea has coarse, simple or forked trichomes; A. platysperma also has dendritcally-branched trichomes, but they are relatively coarse with just 3-5 branches and are noticeably spaced. Finally, the dense, abundant pubescence of A. pinzliae extends to the upper stems and even sparsely to the pedicels, whereas the upper parts of plants of the other two species are glabrous (Rollins 1982).
Terrestrial Habitat(s): Alpine, Bare rock/talus/scree, Forest - Conifer, Forest/Woodland
Habitat Comments: Subalpine to alpine, occurring on mountain slopes in steep dry drainages, avalanche chutes, talus of cirques, and snow depressions on north to east aspects. Soil is deep, loose, sandy to gravelly, and granitic. Sites tends to have a sparse cover of other species such as Ericameria suffruticosa, Eriophyllum lanatum var. integrifolium, Erysimum capitatum, Arabis platysperma, and Raillardella argentea, Zones of occurrence include subalpine coniferous forest, subalpine sagebrush, and alpine fell-field. 3000-3500 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
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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: 20May2003
NatureServe Conservation Status Factors Author: Knight, T. (rev. Morefield, J./Maybury, K. 5/96), rev. L. Oliver (2003), 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
  • Al-Shehbaz, I. A. 2003. Transfer of most North American Species of Arabis to Boechera (Brassicaceae). Novon 13: 381-391.

  • California Department of Fish and Game. 2000. Natural Diversity Database (RareFind 2), Version 2.1.2, January 25, 2000. Downloaded in 2003.

  • 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.

  • 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.

  • Rollins, R. C. 1982. Studies on Arabis (Cruciferae) of western North America II. Contributions from The Grey Herbarium of Harvard University 212:107-111.

  • 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.

  • Weixelman, D., and D. Atwood. 1990. Toiyabe National Forest sensitive plants field guide. U.S. Forest Service, Intermountain Region, Ogden, UT. 123 pp.

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