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Related to knotweed: giant knotweed
Any of various low-growing or shrubby plants of the family Polyganaceae, having jointed stems and small flowers.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Plants) any of several polygonaceous plants of the genus Polygonum, having small flowers and jointed stems
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
any of several knotty-stemmed plants belonging to the genus Polygonum, of the buckwheat family.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.