knotgrass

World English Dictionary
knotgrass (ˈnɒtˌɡrɑːs)
 
n
1.  Also called: allseed a polygonaceous weedy plant, Polygonum aviculare, whose small green flowers produce numerous seeds
2.  any of several related plants

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
knotgrass

noun
low-growing weedy grass with spikelets along the leaf stems 
WordNet® 3.0, © 2006 by Princeton University.
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