One of the mysteries of the English language finally explained.
1A common Eurasian plant of the dock family, with jointed creeping stems and small pink flowers. It is a serious weed in some areas.
Genus Polygonum, family Polygonaceae: several species, in particular P. aviculare
- ‘The main weeds dying back were creeping thistle, couch and mature knotgrass.’
- 1.1 Any of a number of other plants, especially grasses, with jointed stems.
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