Origin: Greek prefix poly-
Polygonum has 2 different meanings across 1 category:
diverse genus of herbs or woody subshrubs of north temperate regions
Any of many plants, of the family Polygonaceae, embracing a large number of species, including bistort, knotweed, smartweed, etc.
The word comes from Ancient Greek polúgonon, meaning "knotweed," which combines words for "many" and "knee." It was named this way because the plant has numerous joints.