Astragalus leptaleus - Gray
Park Milkvetch
Taxonomic Status: Accepted
Related ITIS Name(s): Astragalus leptaleus Gray (TSN 25560)
Unique Identifier: ELEMENT_GLOBAL.2.147959
Element Code: PDFAB0F4R0
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 leptaleus
Conservation Status
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NatureServe Status

Global Status: G3G4
Global Status Last Reviewed: 14Jul2014
Global Status Last Changed: 14Jul2014
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G3 - Vulnerable
Reasons: Astragalus leptaleus is known from western Montana to east-central Idaho (sixteen occurrences in Custer and Lemhi Counties), south in the Rocky Mountains to Colorado.
Nation: United States
National Status: N3N4

U.S. & Canada State/Province Status
United States Colorado (S2), Idaho (S3), Montana (S3?), Wyoming (S1)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Regional endemic with a bimodal distribution in NC Idaho and W Montana and SE Wyoming and C Colorado.

Number of Occurrences:  
Number of Occurrences Comments: In Idaho, known from sixteen occurrences (Idaho Native Plant Society, 1992).

Overall Threat Impact Comments: USFS: all locations are subject to trampling and grazing, and also fishing and camping vehicle traffic.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Regional endemic with a bimodal distribution in NC Idaho and W Montana and SE Wyoming and C Colorado.

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

U.S. & Canada State/Province Distribution
United States CO, ID, MT, WY

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
ID Custer (16037), Lemhi (16059)
MT Beaverhead (30001)
WY Carbon (56007)*
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
10 Red Rock (10020001)+, Upper North Platte (10180002)+*
17 Birch (17040216)+, Little Lost (17040217)+, Big Lost (17040218)+, Upper Salmon (17060201)+, Pahsimeroi (17060202)+, Lemhi (17060204)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Technical Description: From CNHP Wetland Guide 2012: Growth Habit: rhizomatous, weak-stemmed, diffuse, herbaceous perennial with taproot and branching subterranean caudices with solitary or, usually, numerous mat-forming stems up to 20 cm long; Leaves: 15 to 27 elliptic-shaped leaflets per leaf; upper leaflet surface becomes hairless with age; Flowers: 2 to 4, rarely as many as 5, downward pointing, predominately white-cream colored flowers are on each flowering stem, with a characteristic dark-colored purplish spot near the tip of the keel of the flower; calyx tube is usually densely covered with small, black hairs. Fruits: oblong-ellipsoid pods are approximately 1 to 2.5 cm long, hang from their stalks, and are thinly covered with black and white hairs, pod is somewhat flattened on the top and bottom sides (at right angles to the seams, or sutures), bottom suture is slightly raised and keel-like, positioned in a shallow, broad groove. At the base of each pod is a short neck or stipe up to 1.5 mm long. Seeds: 6 to 10 ovules per fruit (pod), brown, smooth, shiny seeds, approximately 1.8 to 2.1 mm long.

Diagnostic Characteristics: From CNHP Wetland Guide 2012: Main Characteristics:
·Racemes usually 2-3 flowered
·Flowers white with a purple-tipped keel
·Fruit subsessile or stipitate to 1.5 mm

Habitat Comments: Sedge-grass meadows, swale, hummocks at the edges of mountain brooks and among streamside willows at 2800-8700 feet.
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: 28Jul1993
NatureServe Conservation Status Factors Author: Stoner, N., rev. D. Gries (1998)

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
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  • Ackerfield, J. 2011. The Flora of Colorado. Plant Identification BZ 223. Colorado State University Herbarium, Ft. Collins, CO.

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

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

  • Evert, E. F. 2010. Vascular Plants of the Greater Yellowstone Area: Annotated Catalog and Atlas. Park Ridge, IL.

  • Fertig, W. 1999. State Species Abstract: Astragalus leptaleus. Updated 2008 by J. Handley. Wyoming Natural Diversity Database. Available on the internet at www.uwyo.edu/wyndd.

  • Harrington, H.D. 1954. Manual of the plants of Colorado. Sage Press, Chicago. 666 pp.

  • Idaho Native Plant Society. 1992. Federal candidate (C1 and C2) and listed rare plants of Idaho. unpaginated.

  • 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.

  • Kartesz, J.T. 1996. Species distribution data at state and province level for vascular plant taxa of the United States, Canada, and Greenland (accepted records), from unpublished data files at the North Carolina Botanical Garden, December, 1996.

  • Ladyman, J. A. R. 2006. Astragalus leptaleus Gray (park milkvetch): A Technical Conservation Assessment. USDA Forest Service, Rocky Mountain Region. http://www.fs.fed.us/r2/projects/scp/assessments/Astragalusleptaleus.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.

  • Mills, S. and M. Neighbours. 1995. Intensive data gathering project (fine-filter analysis) for occurrences of rare, threatened, endangered and sensitive species in sections M331H and M331I, north central highlands and northern parks and ranges, in Wyoming. Unpublished report prepared for Medicine Bow National Forest by the Wyoming Natural Diversity Database, Laramie, WY. 294 pp.

  • Moseley, R. K., M. Manusco, and J. Hiltly. 1992. Rare plant and riparian vegetation inventory of the Boise foothills, Ada County, Idaho. Unpublished report on file, Idaho Conservation Data Center (IDCDC), Department of Fish and Game, Boise, ID. 20 pp.

  • Spahr, R., L. Armstrong, D. Atwood, and M. Rath (comp.). 1991. Threatened, Endangered, and Sensitive Species of the Intermountain Region. US Forest Service Region 4, Ogden, UT. (not paginated)

  • Spahr, R., L. Armstrong, D. Atwood, and M. Rath. 1991. Threatened, endangered, and sensitive species of the Intermountain Region. U.S. Forest Service, Intermountain Region, Ogden, UT.

  • USDA, NRCS. 2013. The PLANTS Database. National Plant Data Team, Greensboro, NC 27401-4901 USA.

  • Weber, W. A. and R. C. Wittmann. 2012. Colorado Flora, Eastern Slope, A Field Guide to the Vascular Plants, Fourth Edition. Boulder, Colorado. 555 pp.

  • Weber, W. A. and R. C. Wittmann. 2012. Colorado Flora, Western Slope, A Field Guide to the Vascular Plants, Fourth Edition. Boulder, Colorado. 532 pp.

  • von Ahlefeldt, J. 1993. Medicine Bow National Forest Sensitive plant species (Region 2 list) and species of special concern (Nature Conservancy). Unpublished report prepared by Medicine Bow National Forest. 35 pp.

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