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This is growing where I planted some pepper seads this spring. Using the various weed identification sites, the closest thing I can to is Swamp Smartweed. Also know as water pepper. It should be some sort of pepper, but it's not doing much but growing and has these seed pods/clusters. So far no flower. It appears to have ochrea at each branch. (each leave is one leaf off the main branch.)
The leaves are distinctly bi-colored with a dark and light green on them. Almost looks like shadows, but it's not.
i could be mistaken but i'm pretty sure those are the flowers. i've seen that plant before but can't recall the name at the moment. it could be this one: http://davesgarden.com/guides/pf/showimage/162524/
Yes, those are the flowers and it is a Persicaria of some sort. Even if it is one of the Persicaria's with "pepper" as part of the common name, it is not a real pepper and is not at all related to the peppers you planted and were expecting to come up there.
that seems to be the identical plant. So it's a flower, not a weed, but I have no desire to have it in my veggie garden. :-)
And the 3 plants are growing pretty big, ( 2-3' diameter each) but no flowers yet. Just seeds. Of if it did flower, they were mighty tiny and I missed it. :-)
what you are calling seeds on the picture are flower heads, not seeds, but possibly in the early seed-forming stage. flowers have to come before the seeds, not after. even though it flowers, it's still a weed.
hope this makes it more clear for you.