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Burr-liking flower/seed heads on this grassy "weed" - kind of large. The "burrs" were maybe thimble-sized.
Growing on the bank of the C&O Canal.
Hi Ann - thanks for the suggestion! I think that's on the right track, but the one you linked to is a bit smaller than the one I posted, and the seedheads are slightly different. But now I know what the smaller ones I've found in yards are! :)