cirsium lanceolatum(n = noun.plant) boar thistle, bull thistle, cirsium vulgare, spear thistle - European thistle with rather large heads and prickly leaves; extensively naturalized as a weed in the United States;
is a kind of plume thistle, plumed thistle

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