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These seed heads are so soft I couldn't even feel them when I touched them. The stems don't look very soft, though. Are they Cirsium arvense? I can't find anything that looks exactly like these photos. The second photo shows them in the foreground, which leads me to think that Creeping thistle might be the right ID. I see that the common name "Canada thistle" is a misnomer, as C. arvense is not...