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Montana Field Guide

Montana Field Guides

Lackschewitz' Milkvetch - Astragalus lackschewitzii

Species of Concern

Global Rank: G2G3
State Rank: S2S3
* (see State Rank Reason below)

Agency Status
USFWS:
USFS: SENSITIVE
BLM:
MNPS Threat Rank: 3
C-value:

External Links






State Rank Reason (see State Rank above)
Montana endemic restricted to high elevation, gravelly and rocky slopes and ridges. Several of the known occurrences are in designated wilderness and the habitats occupied by the species are not generally subject to human disturbance.
  • Details on Status Ranking and Review
    Lackschewitz' Milkvetch (Astragalus lackschewitzii) Conservation Status Review
    Review Date = 04/25/2013
    View State Conservation Rank Criteria
    Population Size

    Score1 - Moderate: Generally 10,000-100,000 individuals.

    Range Extent

    Score3 - Local Endemic or Very Small Montana Range: Generally restricted to an area <10,000 sq. miles (equivalent to the combined area of Phillips and Valley Counties) or <6 Sub-basins (4th code watersheds) Range-wide OR limited to one Sub-basin in Montana

    Area of Occupancy

    Score2-3 - Very Low to Low. Occurs in 10 or fewer Subwatersheds (6th Code HUC’s), though the species' distribution is not sufficiently documented to place it within one class.

    CommentSpecies often occurs near or along the upper boundaries the watersheds.

    Environmental Specificity

    Score1-2 - Moderate to High.

    Trends

    Score0-1 - Stable to Minor Declines:

    CommentTrends unknown, though populations are likely stable or experiencing only minor declines.

    Threats

    Score0-1 - Low to Medium.

    Intrinsic Vulnerability

    Score1 - Moderate Vulnerability: Specific biological attributes, unusual life history characteristics or limited reproductive potential makes the species susceptible to extirpation from stochastic events or other adverse impacts to its habitat and slow to recover.

    Raw Conservation Status Score

    Score 8 to 12 total points scored out of a possible 19.

 
General Description
Lackschewitz' Milkvetch is a low and loosely tufted or matted perennial, with prostrate or ascending stems less than 10 cm long, arising from a branched rootcrown. Leaves are alternate on the stem, 2.2-5.8 cm long, with 15-23 ovate or elliptic leaflets; the upper leaflet surface is glabrous and the lower surface and outer margins have short hairs. The 3-5 pea-like flowers are borne in an open, upright inflorescence that often becomes prostrate as fruits mature. Petals are 8.5-11.2 mm long and purplish-blue. The calyx is 2.5-3.8 mm long and covered with uniformly short, straight black hairs sometimes intermixed with white. The oval or elliptic pod is 9-11.2 mm long, curved upward, and triangular in cross section, with a groove at the bottom, and covered with short hairs.

Phenology
Flowering and fruiting in July-August.

Diagnostic Characteristics
The other two Astraglus species that are small, low-growing species on limestone at high elevations in nothwest Montana are A. alpinus and A. bourgovii. The former differs from A. lackschewitzii in having leaflets that are blunt at the tip and pods that are almost completely divided into two chambers. The latter differs in that it has pods which are oval in cross-section.

Species Range
Montana Range

Click the legend blocks above to view individual ranges.
 


Range Comments
Endemic to the Rocky Mountain front range in west-central Montana, Teton County (Lavin and Marriott 1997).

Summary of Observations Submitted for Montana
Number of Observations: 47

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Open, gravelly, calcareous soil and talus on ridge tops and slopes in alpine or subalpine zones.
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habit Model available.

To learn how these Models were created see http://mtnhp.org/models

Ecological Systems Associated with this Species

References
  • Additional ReferencesLegend:   View Online Publication
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    • Lavin, M. and H. Marriott. 1997. Astragalus molybdenus s.l. (Leguminosae): Higher taxonomic relationships and identity of constituent species. Systematic Botany 22(2):199-217.
    • Lavin, M., S. Mathews, C. Hughes, H. Marriott and S. Shelly. 1990. Intraspecific chloroplast DNA diversity is high in some wild species of Leguminosae. Amer. J. Bot. 77 (supplement):144 (abstract).
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Phillips, H. Wayne. Lewis and Clark National Forest, 1101 15th Street North, P.O. Box 869, Great Falls, MT 59403. 406/791-7743. Personal Communication to the Montana Natural Heritage Program.
    • Schassberger, L.A. 1989. Field surveys of the Front Range Mountains, 7-10 and 21-23 August (Astragalus lackschewitzii).
    • Schassberger, L.A. And J.S. Shelly. 1990. Status Review and Taxonomic Studies of Astragalus molybdenus, Lewis and Clark National Forest. Unpublished Report. Montana Natural Heritage Program, Helena, MT 45 pp.
    • Shelly, J. S. 1989. Field Survey in Teton County of 7-10, 21-23, and 28-30 August.
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Citation for data on this website:
Lackschewitz' Milkvetch — Astragalus lackschewitzii.  Montana Field Guide.  .  Retrieved on , from