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Montana Field Guide

Montana Field Guides

Alpine Meadowrue - Thalictrum alpinum

Species of Concern

Global Rank: G5
State Rank: S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS: SENSITIVE
BLM:
MNPS Threat Rank: 2
C-value: 9

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where it is known from approximately two dozen sites mostly on public land. Its habitat is vulnerable to hydrological alteration. Grazing can be beneficial, except where it leads to stream downcutting and loss of riparian habitat.
  • Details on Status Ranking and Review
    Alpine Meadowrue (Thalictrum alpinum) Conservation Status Review
    Review Date = 01/05/2013
    View State Conservation Rank Criteria
    Population Size

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

    Range Extent

    Score1 - Peripheral, Disjunct or Sporadic Distribution in MT: Widespread species that is peripheral, disjunct or sporadically distributed within MT such that it occurs in <5% of the state (<7,500 sq. miles or the combined area of Beaverhead and Ravalli Counties) or is restricted to 4-5 sub-basins.

    Area of Occupancy

    Score2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score2 - High: Species is restricted to a highly specialized and limited habitat and is typically dependent upon unaltered, high-quality habitat (C Values of 8-10).

    Trends

    Score1 - Minor Declines: Species has experienced declines of 10-30% in population size, range extent and/or occupied area in the recent past (approximately 30 years).

    CommentTrend data are unavailable. Estimated based upon potential alteration/degradation of some of the species' habitat.

    Threats

    Score1-2 - Medium to High.

    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 9 to 10 total points scored out of a possible 19.

 
General Description
Monoecious. Stems glaucous 10–20 cm with glabrous, glaucous foliage. Leaves mainly basal, twice ternate to bipinnate, ultimate leaflets leathery, 2–7 mm long, 3- to 5-lobed. Inflorescence racemose with 8 to 15 nodding flowers. Flowers perfect; sepals purplish, 1–2 mm; anthers ca. 2 mm long, longer than the filaments. Fruits 2 to 6 spreading achenes, the body 2–3 mm long, on nodding pedicels (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Phenology
Flowering occurs in late May and June, and fruiting in July.

Diagnostic Characteristics
Alpine meadowrue is less than 20 cm tall with thin stems and all leaves near the base (and consequently is very inconspicuous among the taller, denser graminoids with which it grows). Other species of Thalictrum are taller and have leaves along the stem.

Species Range
Present
 


Range Comments
Circumpolar. AK to Greenland south at scattered locales to CA, NM, CO; Eurasia (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 41

(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
Alpine meadowrue typically grows in moist montane and lower subalpine areas. In southwestern Montana, it occurs in moist alkaline meadows dominated by Potentilla fruticosa (shrubby cinquefoil) and Juncus balticus (Baltic rush), sometimes along stream channels. Frequent associates include Deschampsia cespitosa, Dodecatheon pulchellum, Salix brachycarpa, Arctostaphylos uva-ursi, and Muhlenbergia richardsonis. The substrate varies from peat to marl, calcareous silt, silty clay or clay loam, often on limestone parent material.

Ecological Systems Associated with this Species

Ecology
Alpine meadowrue often occurs on the upper portions of hummocks, suggesting that it may favor a more open, somewhat drier microhabitat.

Management
Livestock grazing creates hummocky habitat and may benefit alpine meadowrue. Grazing may also reduce the vigor of taller graminoids that shade this diminutive species. However heavy grazing and trampling can reduce species diversity, potentially impacting this plant and increasing the chance of exotic invasion (Lesica, 1990). Alpine meadowrue is also vulnerable to hydrologic alteration of its wetland habitat. Stream diversion could lower water tables, and heavy grazing could destabilize banks, causing channel downcutting that leads to lower water tables.

References
  • Additional ReferencesLegend:   View Online Publication
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    • Fertig, W. and G. Jones. 1992. Plant communities and rare plant species of the Swamp Lake Botanical Area, Clark's Fork Ranger District, Shoshone National Forest. Unpublished report to the Shoshone National Forest. Challenge Cost Share Agreement No. CSA-2-91-14-0001. Wyoming Natural Diversity Database. 113+ pp.
    • Lesica, P. 1990. Vegetation and sensitive vascular plants of Morrison Lake, Harkness Lakes and Nicholia Creek wetlands, Beaverhead County, Montana. Report to Beaverhead National Forest, Dillon, Montana. 28 pp.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Vanderhorst, J.P. and P. Lesica. 1994. Sensitive plant survey in the Tendoy Mountains, Beaverhead County, Montana. Unpublished report to the Bureau of Land Management, Butte District. Montana Natural Heritage Program, Helena, MT. 59 pp. plus appendices.
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Citation for data on this website:
Alpine Meadowrue — Thalictrum alpinum.  Montana Field Guide.  .  Retrieved on , from