Cirsium flodmanii (Flodman's Thistle)
|Also known as:
|Hollow-root Thistle, Prairie Thistle
|biennial, short-lived perennial
|sun; moist prairies
|June - August
|1 to 3 feet
|Wetland Indicator Status:
|GP: FAC MW: FAC NCNE: FACU
|MN county distribution (click map to enlarge):
|National distribution (click map to enlarge):
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Flower heads are reddish purple to rose, 1 to 2 inches wide, single or a few at the end of branching stems at the top of the plant. Bracts are longer than wide with white racing stripe and small spreading spines.
Leaves and stem:
Leaves are alternate and deeply lobed, about 6 inches long at the base of the plant, becoming smaller as they ascend the stem. Lobes are generally triangular and quite wavy, with a spine at the tip of a lobe. The upper surface is dark green, lightly covered in cob-webby hairs, while the lower surface is velvety white from a dense mat of hairs.
Like most native thistles this one's spines are far less dense and prickly as compared to most of the non-native and more aggressive species.Though this species can be found up into the Arrowhead region, it is most commonly found throughout the western half of Minnesota on lower, moderately moist sites. It is easily distinguished from other thistles by the cob-webby or woolly hairs throughout, and its relatively short stature.
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- Flodman's Thistle plant
- Flodman's Thistle habitat
- first year rosette of leaves
- upper leaves
- early season plant
- late season plant
Photos by K. Chayka taken at McKnight Prairie, Goohdue County, and at Ordway Prairie, Pope County. Photos courtesy Peter M. Dziuk taken in Pennington County and at Ordway Prairie..
Have you seen this plant in Minnesota, or have any other comments about it?