knotweed
/ˈnɒtwiːd/noun
mass noun
1- a plant of the dock family, which typically has sheaths where the leaves join the stems and is often an invasive weed（具托叶鞘的）蓼科植物（常为入侵杂草）。
1.1
- Polygonum and other genera, family Polygonaceae: several species, in particular Japanese knotweed.蓼属及其他属, 蓼科：数种, 尤指蚕茧草。
1.2
- knotgrass两耳草, 扁蓄。