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Polygonum tenue : ウィキペディア英語版 | Polygonum tenue
''Polygonum tenue'', the Slender knotweed or pleat-leaf knotweed, is a North American species of plants in the buckwheat family. it is widespread across south-central Canada (Ontario) and the eastern and central United States from Maine to Georgia, west as far as Minnesota, South Dakota, Nebraska, and Texas (though apparently now extirpated from Maine and New Hampshire).〔(Biota of North America Program 2014 county distribution map )〕 ''Polygonum tenue'' is a herb up to tall. Stems are green or brown, not wiry. Leaves are narrow, up to long. Flowers are pink or white.〔(Flora of North America, ''Polygonum tenue'' Michaux, 1803. Slender or pleat-leaf knotweed )〕 ==References==
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