Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Moosewort - Botrychium tunux

No photos are currently available
If you have a high quality photo of this species, are confident in the identification, and would like to submit it for inclusion on the Montana Field Guide, please send it to us using our online photo submission tool.

Species of Concern
Native Species

Global Rank: G3G4
State Rank: S1
(see State Rank Reason below)
CCVI: Moderately Vulnerable

Agency Status


External Links

State Rank Reason (see State Rank above)
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


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east-central CA, soutehrn NV, and central (mountainous) portions of CO and NM (Donald Farrar, Iowa State University, unpublished ms.).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

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



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

Sparsely vegetated erosional slopes and rocky stream terraces.

  • Additional ReferencesLegend:   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.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
  • Web Search Engines for Articles on "Moosewort"
Login Logout
Citation for data on this website:
Moosewort — Botrychium tunux.  Montana Field Guide.  .  Retrieved on , from