Astragalus barrii - Barneby
Barr's Milkvetch
Other Common Names: Barr's milkvetch
Taxonomic Status: Accepted
Related ITIS Name(s): Astragalus barrii Barneby (TSN 25432)
Unique Identifier: ELEMENT_GLOBAL.2.130006
Element Code: PDFAB0F150
Informal Taxonomy: Plants, Vascular - Flowering Plants - Pea Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Fabales Fabaceae Astragalus
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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: Astragalus barrii
Conservation Status
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NatureServe Status

Global Status: G3
Global Status Last Reviewed: 15Apr1999
Global Status Last Changed: 04Jun1990
Rounded Global Status: G3 - Vulnerable
Reasons: Regional endemic with ca. 100 occurrences; new coalbed methane threats warrant consideration. May require "semi-natural matrix" landscape.
Nation: United States
National Status: N3

U.S. & Canada State/Province Status
United States Montana (S3), Nebraska (S1), South Dakota (S3), Wyoming (S3)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Regional endemic, known from the southwestern South Dakota, northeastern Wyoming, southeastern Montana and Nebraska.

Number of Occurrences: 21 to >300
Number of Occurrences Comments: 34 extant and 1 historic EOs in Wyoming, 30 extant and 1 historic EOs in MT, similar numbers is South Dakota.

Population Size Comments: There is an estimated total of over 30,000 individuals in Montana but known occupied habitat may be less than a square mile. Wyoming populations surveyed by Marriott (1992) ranged in size from several hundred to over 10,000 individuals for a total of over 100,000.

Overall Threat Impact Comments: Overall, many populations are not threatened. Specific populations may be threatened by expansion of coal mining, and future oil and gas development, including coalbed methane. In South Dakota, zeolite mining and off-road vehicle impact are considered threats (Dave Ode, pers. comm. to H. Marriott, 1992). Coalbed methane development warrants consideration. Noxious weed threats are low.

Short-term Trend: Unknown
Short-term Trend Comments: Most populations appear to be stable. Loss of habitat to coal strip mining, and death of plants due to 1980s drought has been reported but magnitude and long-term trend of the latter have not been assessed. Oil development has been intense in part of its habitat but there is little evidence of direct impact to the species.

Environmental Specificity Comments: It is restricted to barren outcrops on ridges and hills derived from fine parent materials; representing harsh, localized habitats on the landscape.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Regional endemic, known from the southwestern South Dakota, northeastern Wyoming, southeastern Montana and Nebraska.

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

U.S. & Canada State/Province Distribution
United States MT, NE, SD, WY

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
MT Big Horn (30003), Carter (30011)*, Powder River (30075), Rosebud (30087)
NE Dawes (31045)
SD Custer (46033), Fall River (46047), Pennington (46103), Shannon (46113)
WY Campbell (56005), Converse (56009), Johnson (56019), Natrona (56025), Niobrara (56027), Sheridan (56033), Weston (56045)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Upper Tongue (10090101)+, Lower Tongue (10090102)+, Middle Fork Powder (10090201)+, Upper Powder (10090202)+, South Fork Powder (10090203)+, Salt (10090204)+, Crazy Woman (10090205)+, Clear (10090206)+, Middle Powder (10090207)+, Little Powder (10090208)+, Lower Powder (10090209)+, Mizpah (10090210)+, Lower Yellowstone-Sunday (10100001)+, Big Porcupine (10100002)+, Rosebud (10100003)+, O'fallon (10100005)+*, Upper Little Missouri (10110201)+*, Antelope (10120101)+, Dry Fork Cheyenne (10120102)+, Upper Cheyenne (10120103)+, Lance (10120104)+, Lightning (10120105)+, Angostura Reservoir (10120106)+, Beaver (10120107)+, Middle Cheyenne-Spring (10120109)+, Rapid (10120110)+, Middle Cheyenne-Elk (10120111)+, Upper Belle Fourche (10120201)+, Upper White (10140201)+, Middle North Platte-Casper (10180007)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: Herbaceous perennial forming dense mats which rarely exceed 4 inches in height. Both stems and leaves are covered with short, white hairs and the flowers are iridescent bluish-purple to pinkish-purple (Schassberger 1990).
General Description: Barr's Milkvetch is a perennial that grows in low, dense mats. Leaves have 3 narrowly lance-shaped leaflets and are 1-4 cm long, densely covered with short white hairs. Stipules at the leaf bases are membranous. Purple or pinkish-purple flowers that are shaped like pea flowers are borne in a narrow, open, few-flowered inflorescence. The petals are 7-17 mm long. The calyx is 3-5 mm long and densely covered with long, white hairs. The sparsely white, hairy pod is narrowly elliptical, 4-8 mm long, and 1-2 mm in diameter.
Diagnostic Characteristics: The only other mat-forming species with 3-leaflets in the range of A. BARRII in Montana are A. GILVIFLORUS and A. HYALINUS. Both have white flowers and a longer calyx tube (6-16 mm) than A. BARRII calyx tube length (2.8-5 mm). They also have peduncles which are short (<3.5 mm) or absent compared to A. BARRII peduncle length (7-24 mm).
Habitat Comments: In southeastern Montana, is restricted to heavy clay knobs, buttes, and barren hilltops. Often only a sparse shrub cover of Artemisia tridentata and/or Atriplex confertifolia is present. Also occurs in silty to sandy, calcareous soils. When an upper overstory is present, usually consists of a sparse cover of Pinus ponderosa and Juniperus scopulorum. Populations of this plant are associated with the harsh edaphic and environmental conditions of badlands areas (Schassberger 1990). Buttes, bluffs, clay hills or sandstone, open barren ground; 900-1450 m (Isely 1998).
Economic Attributes
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Economically Important Genus: Y
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: 15Apr1999
NatureServe Conservation Status Factors Author: Ode, D.; rev. W. Fertig, B. Heidel (1999).
Element Ecology & Life History Edition Date: 28Sep1994
Element Ecology & Life History Author(s): JM

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
  • Andersen, M.D. and B. Heidel. 2011. HUC-based species range maps. Prepared by Wyoming Natural Diversity Database for use in the pilot WISDOM application operational from inception to yet-to-be-determined date of update of tool.

  • Barneby, R. C. 1964. Atlas of North American Astragalus. Pages 1-1188. Memoirs of the New York Botanical Garden 13:(II).

  • Dingman, S. 2005. Habitat and life history characteristics of Astragalus barrii (Fabaceae) in the South Dakota badlands. Masters Thesis. Department of Biology, University of South Dakota, Brookings, SD.

  • Dorn, R. D. 1992. Vascular Plants of Wyoming, second edition. Mountain West Publishing, Cheyenne, WY.

  • Dorn, R. D. 2001. Vascular Plants of Wyoming, third edition. Mountain West Publishing, Cheyenne, WY.

  • Ebertowski, P., B. E. Nelson, and R. L. Hartman. 2004. Status report on the general floristic survey of the Thunder Basin National Grassland, Wyoming. Unpublished report prepared for Medicine Bow-Routt National Forest by the Rocky Mountain Herbarium, University of Wyoming, Laramie, WY.

  • Fertig, W. 2001. State Species Abstract: Astragalus barrii. Updated 2008 by B. Heidel. Wyoming Natural Diversity Database. Available on the internet at www.uwyo.edu/wyndd.

  • Great Plains Flora Association. 1986. Flora of the Great Plains. University Press of Kansas, Lawrence, KS.

  • Hartman, R. L. and B. E. Nelson. 1994. Status report on the general floristic inventory of the southern Powder River Basin and eastern Plains, Wyoming. Unpublished report prepared for the Bureau of Land Management Casper District by the Rocky Mountain Herbarium, Laramie, WY.

  • Hartman, R. L. and B. E. Nelson. 1995. Final report on the general floristic inventory of the southern Powder River Basin and eastern Plains, Wyoming. Unpublished report prepared for the Bureau of Land Management Wyoming State Office by the Rocky Mountain Herbarium, University of Wyoming, Laramie, WY.

  • Heidel, B. 2004. Inventory of Astragalus barrii Barneby (Barr?s milkvetch) in the Spring Creek Unit of Thunder Basin National Grassland. Unpublished report prepared for the Medicine Bow National Forest by the Wyoming Natural Diversity Database, Laramie, WY.

  • Isely, D. 1998. Native and Naturalized Leguminosae (Fabaceae) of the United States (exclusive of Alaska and Hawaii). MLBM Press, Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT.

  • Isely, D. 1998. Native and naturalized Leguminosae (Fabaceae) of the United States (exclusive of Alaska and Hawaii). Monte L. Bean Life Science Museum, Brigham Young University; MLBM Press, Provo, Utah. 1007 pp.

  • Kartesz, J. T., and C. Meacham. 1999. Unpublished review draft of Floristic Synthesis, 10Jun99 and/or 16Jun99. North Carolina Botanical Garden, Chapel Hill.

  • 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.

  • Ladyman, J. A. R. 2006. Astragalus barrii Barneby (Barr?s milkvetch): A Technical Conservation Assessment. USDA Forest Service, Rocky Mountain Region. http://www.fs.fed.us/r2/projects/scp/assessments/Astragalusbarrii.pdf.

  • Lesica, P. & J. S. Shelly. 1991. Sensitive, Threatened and Endangered Vascular Plants of Montana. Montana Natural Heritage Program, Occ. Publ. No. 1. Helena, MT.

  • Locklear, J. 2002. CPC National Collection Plant Profile: Astragalus barrii. Posted by the Center for Plant Conservation - National Collection of Endangered Plants, at: http://www.centerforplantconversation.org/

  • Marriott, H. 1992. Field survey for ASTER MOLLIS, ASTRAGALUS BARRII and LESQUERELLA ARENOSA var. ARGILLOSA in northeast and central Wyoming. Unpublished report to the Bureau of Land Management, Casper. Wyoming Natural Diversity Database, Laramie, Wyoming. 69 pp.

  • Marriott, H. J. 1992. Field survey for Aster mollis, Astragalus barrii and Lesquerella arenosa var. argillosa in northeast and central Wyoming. Unpublished report prepared for the Bureau of Land Management by the Wyoming Natural Diversity Database, Laramie, WY. 69 pp.

  • Marriott, H. J. 1992. Field survey for Aster mollis, Astragalus barrii and Lesquerella arenosa var. argillosa in northeast and central Wyoming. Unpublished report prepared for the Bureau of Land Management by the Wyoming Natural Diversity Database, Laramie, WY.

  • Montana Natural Heritage Program. 1999. April 1 - last update. Species Information: Astragalus barrii. Montana Natural Heritage Program. Online. Available: http://orion2.nris.state.mt.us/mtnhp/plants/index.html Accessed 1999, April 14.

  • Neighbours, M. and H. Marriott. 1991. Candidate sensitive plant species, Platte River Resource Area, Bureau of Land Management. Prepared for the BLM by the Wyoming Natural Diversity Database, Laramie, WY.

  • Ode, D. 1990. Dakota Flora: Barr's milkvetch. South Dakota Conservation Digest 57 (3): 24.

  • Ode, D.J. 1988. Four endemic plants of the northern Grea t Plains. Symposium paper. Proc. North Dakota Academy of Science 42:7.

  • Roderick, A. J., B. E. Nelson, and R. L. Hartman. 1999. Final report on the general floristic inventory of the Upper North Platte and Laramie River drainages. Unpublished report prepared for the Bureau of Land Management Rawlins and Casper Districts by the Rocky Mountain Herbarium, University of Wyoming, Laramie, WY.

  • Schassberger, L. A. 1988. Status review of ASTRAGALUS BARRII, USDA Forest Service, Region 1, Custer National Forest. Unpublished report. Montana Natural Heritage Program, Helena, MT. 61 pp.

  • Schassberger, L. A. 1988. Status review of ASTRAGALUS BARRII, USDA Forest Service, Region 1, Custer National Forest. Unpublished report. Montana Natural Heritage Program, Helena, MT. 61 pp.

  • Schassberger, L. A. 1990. Report on the conservation status of ASTRAGALUS BARRII, a candidate threatened species. Unpublished report to the U.S. Fish & Wildlife Service, Denver. Montana Natural Heritage Program, Helena, MT. 85 pp.

  • Schassberger, L. A. 1990c. Report on the conservation status of Astragalus barrii, a candidate threatened species. Unpublished report to the U.S. Fish & Wildlife Service, Denver. Montana Natural Heritage Program, Helena, MT. 85 pp.

  • Schassberger, L.A. 1990. Report on the conservation status of ASTRAGALUS BARRII, a candidate Threatened species. Prepared for the US Fish and Wildlife Service by the Montana Natural Heritage Program, Helena, MT.

  • Taylor, A. and R. Caners. 2002. Baseline survey for Astragalus barrii Barney (Barr's milkvetch) and Physaria didymocarpa var. lanata A. Nels. (Wooly Twinpod) in eastern Big Horn and southwestern Rosebud counties, Montana. Unpublished report to the Bureau of Land Management. Montana Natural Heritage Program, Helena.

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