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Frenchman's Bluff Moonwort -
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State Rank Reason (see State Rank above)
A globally rare species, recently documented in Montana from Glacier National Park
Details on Status Ranking and Review
Score 3 - Vey Small: Generally <2,000 individuals.
Comment<100 plants actually documented in Montana, though population is almost certainly larger. Range Extent
Score 2 - Regional or State Endemic or Small Montana Range: Generally restricted to an area <100,000 sq. miles (equivalent to 2/3 the size of Montana or less) or Montana contributes 50% or more of the species’ range or populations OR limited to 2-3 Sub-basins in Montana. Area of Occupancy
Score 3 - Very Low: Generally occurring in 3 or fewer Subwatersheds (6th Code HUC’s). Environmental Specificity
Score 1 - 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). Trends
Score 0-3 - Population trends are unknown. Threats
Score 0-1 - Low to Medium.
Score 1-2 - Moderate to High Vulnerability. Raw Conservation Status Score
10 to 15 total points scored out of a possible 19.
Trophophore 1-8 mm; blade yellow-green, ovate to oblong-linear, 1-pinnate, to 3 × 0.9 cm, firm, glaucescent. Pinnae to 6 pairs, strongly ascending, well separated, distance between the 1st and 2d pinnae considerably greater than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, fan-shaped to narrowly spatulate, often asymmetric, with distal portion longer than and arching over proximal portion, undivided to tip, rarely 2-cleft, margins entire to irregularly cleft, apex rounded, venation like ribs of fan, midrib absent. Sporophores 2-3-pinnate, 1.5-3 times length of trophophore (Wagner and Wagner, 1993, Fl. North America, Vol. 2).
An unpublished document by Donald Farrar (Iowa State University) indicates disjunct occurences in northwestern MT, northwestern MN, and the Black Hills region of SD.
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)
Fescue grasslands. Farrar (unpublished) indicates that its occurrence in MT and SD is in areas of high diversity in prairies.
Ecological Systems Associated with this Species
Commonly Associated with these Ecological Systems
Legend: View Online Publication Do you know of a citation we're missing? Farrar, Donald. 2011. Moonwort (Botrychium) Systematics. Ada Hayden Herbarium. Iowa State University. Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p. Web Search Engines for Articles on "Frenchman's Bluff Moonwort"