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Moosewort - Botrychium tunux
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A globally rare species, recently documented in Montana from Glacier National Park.
General Description
Plants 6-12 cm tall with a common stalk 0-3 cm long. Tropophores yellow-green and leathery; stalks up to 1 cm long; blades 2.5-7 cm long, 2-4 cm wide, narrowly ovate to ovate, once pinnate. Pinna pairs 4-6, more or less perpendicular to rachis, separate to slightly overlapping but not overlapping the rachis. Basal pinnae 7-20 mm long, 7-18 mm wide, sessile, fan-shapped and spanning an arc of 120-180 degrees, often asymmetrcial with the basal portion expanded. Sporophores 5-10 cm long, the stalks 2.5-5 cm long and shorter than or equaling the length of tropophore; sporangia-bearing portino erect, 1-2-pinnate, broadly ovate in outline, branches 4-6, ascending to spreading, especially the lowermost, which are often twisted such that the sporangia project downwards; sporangia partially embeddedi n the distally thickened sporangiophore branches (adapted from Stenvold et al. 2002).
Species Range
Montana Range
Range Descriptions
Native
Range Comments
In MT only known from Glacier National Park; widely disjunct ranges in southeast AK, YT and BC, MT, southern ID, east-central CA, soutehrn NV, and central (mountainous) portions of CO and NM (Donald Farrar, Iowa State University, unpublished ms.).
Observations in Montana Natural Heritage Program Database
Number of Observations: 2
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Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Sparsely vegetated erosional slopes and rocky stream terraces.
Stewardship Responsibility
References
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