knotweed

[not-weed]
noun
any of several knotty-stemmed plants belonging to the genus Polygonum, of the buckwheat family.

Origin:
1570–80; knot1 + weed1

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World English Dictionary
knotweed (ˈnɒtˌwiːd)
 
n
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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