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.