smartweed
/ˈsmɑːtwiːd/noun
mass noun
1- chiefly N. Amer. a plant of the dock family, typically having slender leaves and a short spike of tiny compact flowers〈主北美〉蓼。
1.1
- Genus Polygonum, family Polygonaceae: several species.蓼属, 蓼科：数种。