Plant ID?

NanaDeb50(8A)

Can anybody help me identify this plant? I found it growing
beside a country road here in central Mississippi. It is
about 4 feet tall and wide and the larger stems are red.
It has been blooming over a month now and I would love
to know what it is. Thanks for any help you can give me.

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wisconsitom(Zone 4/5)

I think it to be one of the Persicarias, AKA "smartweed". Some are also in genus Polygonum. Also some resemblance to Physostegia-Obedient plant. Not entirely sure from pic.

+oM

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NanaDeb50(8A)

Thanks for the help! I think you are right about it being smartweed.

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kchd(7b/8a MS)

Looks like Polygonum pensylvanicum to me, which is pretty common around here in c. Mississippi.

Here is a link that might be useful: Smartweed

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