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Montana Field Guide

Montana Field Guides

Leafy Thistle - Cirsium foliosum

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Not Documented

Global Rank: G4
State Rank: SNA
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Cirsium foliosum is not documented in Montana (MTNHP Status Review in 2017). Cirsium foliosum was included in the Flora of Montana (Booth 1966) which was the basis for its report in the Vascular Plants of Montana (Dorn 1984). The name of Cirsium foliosum was misapplied to many plants in the western U.S. (Keil in Flora of North America 2006). Many specimens have been annotated to Cirsium scariosum which is a highly variable (polymorphic) species (Keil in Flora of North America 2006). This includes herbarium specimens in Montana. A conservation status rank is not applicable (SNA) because this plant is not known to occur in Montana.
General Description
Please refer to the State Rank Reason for its status and the following botanical literature for species identification:

Flora of North America
Published Floras
On-line e-Floras

Potential specimens should be provided to and verified at one of our State Herbaria:
University of Montana (MONTU), Montana State University (MONT), or Montana State University-Billings (MSUB).

Range Comments
In the Yukon, Northwest Territories, British Columbia, and Alberta provinces of Canada and in the mountains of Wyoming, U.S. (Keil in FNA 2006).

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Citation for data on this website:
Leafy Thistle — Cirsium foliosum.  Montana Field Guide.  .  Retrieved on , from