Answer: knotgrass

AnswerCrossword Clue
knotgrassany of several weeds of the genus Polygonum, with wiry jointed creeping stems and small pinkish or whitish flowers in the axils of the leaves
knotgrassA common Eurasian plant of the dock family, with jointed creeping stems and small pink flowers. It is a serious weed in some areas
knotgrassAny of a number of other plants, esp. grasses, with jointed stems