Cirsium flodmanii (Flodman's Thistle)
Family: Asteraceae (Sunflower)

Flodman's Thistle is an uncommon native thistle that can be confused with Canada Thistle. Both species can be found in moist meadows on the plains. Stem leaves of both species are lobed and spiny. Basal leaves of Flodman's Thistle are long, oblong and white on the underside. Flower heads of are slightly larger than those of Canada Thistle. Flodman's Thistle is most likely to be found in northern Colorado, but there are records from a few southern counties.

Accidental spraying of Flodman's Thistle, due to being mistaken for Canada Thistle, could further decrease this already uncommon species. Be sure the species has been correctly identified before spraying.


Vegetation zone:  Plains
Time of bloom:  July - September
Origin:  Native
Eastern Colorado Wildflowers