Plant Database forum: Water Smartweed (Polygonum amphibium? Polygonum coccineum?)

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Name: Catmint/Robin
Maryland (Zone 7a)
Region: Mid-Atlantic Butterflies Forum moderator Native Plants and Wildflowers Bee Lover Echinacea
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Catmint20906
Oct 12, 2014 8:27 AM CST
I have a weed growing in my lawn that at first I identified as Water Smartweed Polygonum coccineum, but then I saw a plant with very similar appearance and characteristics identified as Water Smartweed Polygonum amphibium. The Plant Database has these as two separate entries. I am wondering if these are the same plant, or two different but very similar plants?

thank you!
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Name: Kent Pfeiffer
Southeast Nebraska (Zone 5b)
Charter ATP Member I was one of the first 300 contributors to the plant database! Plant Database Moderator Plant Identifier Region: Nebraska Forum moderator
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KentPfeiffer
Oct 12, 2014 9:34 AM CST

Plants Admin

Depending on who you believe, they are either (closely related) separate species or a single species. And they might belong in the Polygonum genus, or the Persicaria genus, or possibly even the Fallopia genus. The taxonomy of the whole Polygonum/Persicaria/Fallopia group is in an extreme state of flux at the moment, to say the least.
Name: Catmint/Robin
Maryland (Zone 7a)
Region: Mid-Atlantic Butterflies Forum moderator Native Plants and Wildflowers Bee Lover Echinacea
Region: Maryland Garden Photography Cottage Gardener Garden Ideas: Master Level Celebrating Gardening: 2015 The WITWIT Badge
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Catmint20906
Oct 12, 2014 11:20 AM CST
Thanks Kent.
"One of the pleasures of being a gardener comes from the enjoyment you get looking at other people's yards”
― Thalassa Cruso

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