Large-leaved Balsamroot - Balsamorhiza macrophylla
State Rank Reason (see State Rank above)
This species occurs in Montana at the edge of its range where it is known from three southwestern Montana mountain ranges. Most of the known populations are moderate to large in size and in generally good-quality habitat. One occurrence in Gallatin County is only known from a 1931 collection. Invasive weeds are not a problem at sites occupied by Balsamorhiza macrophylla and livestock grazing at some of the sites does not appear to be negatively impacting the species.
- Details on Status Ranking and Review
Score1 - Moderate: Generally 10,000-100,000 individuals.
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.
CommentPeripheral and sporadically distributed in southwest Montana.
Area of Occupancy
Score2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).
Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).
ScoreNA - Rank factor not assessed.
CommentTrends are unknown, though populations are likely stable or experiencing only minor declines.
Score0-1 - Low to Medium.
Score0-1 - Low to Moderate Vulnerability.
Raw Conservation Status Score
5 to 7 total points scored out of a possible 16 (Rarity factors and threats only).
Large-leafed Balsamroot is a large perennial with a well-developed taproot and a branched, underground rootcrown. The leafless flowering stems are 30-100 cm tall; the larger basal leaves are 30-60 cm long and pinnately divided into entire-margined or coarsely toothed segments 5-12 cm long. The foliage has short, stiff hairs and/or long, sparse hairs. The large flower heads resemble those of a sunflower and are usually solitary, occurring at the ends of the stems. The lance-shaped involucral bracts are hairy and 25-50 mm long. The yellow ray flowers are 3-6 cm long, and the yellow disk flowers are ca. 11 mm long. The glabrous achenes are lance-shaped and ca. 1 cm long.
Flowering occurs from late June to early July.
Species of Helianthus, Viguiera and Wyethia have similar flower heads but all have leafy stems. Both Balsamorhiza incana and B. hookeri have pinnately divided leaves, but their leaves are smaller and more divided. The leaves of Balsamorhiza incana also have long, silky hairs, and the ray flowers of B. hookeri are usually less than 3 cm long.
Northern UT and southeast ID through western WY to the northern edge of the Snake R. Plains, thence east to Clark Count, ID, and north to Gallatin County, MT. Peripheral.
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
This species is found in sagebrush and grasslands, in the montane zone. In the Gallatin National Forest, it occurs most often on open, east-facing slopes (8-15%), with loamy soils, in a sagebrush-forb community. Outliers are scattered through Douglas fir - lodgepole pine forest and in forest openings on steeper (45% slope), east-facing slopes with rockier and more clayey soils (Mathews 1989).
Ecological Systems Associated with this Species
The large root and branched rootcrown suggest that this species is long-lived. Foliage is coarse, and the sap is aromatic, probably making it unpalatable to livestock.
Horse and bike riding, especially off-trail, can lead to erosion and mechanical damage to this species' habitat, especially on steep slopes. Grazing impacts are unknown.
- Additional ReferencesLegend: View Online Publication
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- Heidel, B. L. 1992. Field survey to Centennial Mountains of 5 July.
- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
- Mathews, S.Y. 1989. Sensitive plant surveys, 1989: U.S. Forest Service, Region 1, Gallatin National Forest, Montana. Unpublished report to the USDA Forest Service, Gallatin National Forest, Bozeman, Montana. Montana Natural Heritage Program, Helena, MT. 85 pp.
- McCormick, S.P., K.A. Robson, J. Maze, and B.B. Bohm. 1987. Flavonoids of Wyethia section Agnorhiza. Phytochemistry 26(8):2421-2422.