Cirsium flodmanii

{{Short description|Species of thistle}}

{{italic title}}

{{speciesbox

| name = Flodman's thistle

| image = Cirsium flodmanii GNP 01.jpg

| image_caption = Photograph

| image2 = Cirsium flodmanii drawing.png

| image2_caption = 1913 illustrationillustration from Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 3: 551.

| status = {{TNCStatus}}

| status_system = TNC

| genus = Cirsium

| species = flodmanii

| authority = (Rydb.) Arthur

| synonyms = *Carduus flodmanii Rydb.

• Carduus oblanceolatus Rydb.
• Cirsium flodmanii f. oblanceolatum (Rydb.) D.Löve & J.-P.Bernard
• Cirsium nebraskense var. discissum Lunell
• Cirsium oblanceolatum (Rydb.) K.Schum.

| synonyms_ref = {{ThePlantList}}

}}

Cirsium flodmanii, commonly known as prairie thistle, Flodman's thistle, or (in French) chardon de Flodman, is a plant species native to Canada and the northern United States. It has been found in every Canadian province from Québec to Alberta, as well as from the northern Great Plains, northern Rocky Mountains, and western Great Lakes regions of the US, as well as northern parts of Vermont, New York, and Washington.{{eFloras |1 |250066371 |Cirsium flodmanii |first1=David J. |last1=Keil |volume=19}}{{BONAP|ref|genus=Cirsium |species=flodmanii}}

Cirsium flodmanii is a perennial herb up to {{convert|140|cm|in|abbr=in}} tall. Leaves are up to {{convert|40|cm|in|abbr=in}} long, with numerous fine spines along the edges. Flowers are usually purple, occasionally white. The plant generally is found in grasslands and pastures.Arthur, Joseph Charles. Torreya 12(2): 34. 1912.Rydberg, Per Axel. Memoirs of The New York Botanical Garden 1: 451. 1900.