cirsium discolor(n = noun.plant) field thistle - stout North American thistle with purplish-pink flower heads;
is a kind of thistle

cirsium, cirsium arvense, cirsium eriophorum, cirsium flodmanii, cirsium helenioides, cirsium heterophylum, cirsium lanceolatum, cirsium rivulare, cirsium vulgare, discolor, genus cirsium, salix discolor