any of several knotty-stemmed plants belonging to the genus Polygonum, of the buckwheat family.

1570–80; knot1 + weed1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
knotweed (ˈnɒtˌwiːd)
any of several polygonaceous plants of the genus Polygonum, having small flowers and jointed stems

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Knotweed is the only plant species in the understory at this site.
Tackling knotweed can be a daunting task but the benefits are truly rewarding.
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